EP3243928A1 - Conversion coating treatment - Google Patents
Conversion coating treatment Download PDFInfo
- Publication number
- EP3243928A1 EP3243928A1 EP17170451.3A EP17170451A EP3243928A1 EP 3243928 A1 EP3243928 A1 EP 3243928A1 EP 17170451 A EP17170451 A EP 17170451A EP 3243928 A1 EP3243928 A1 EP 3243928A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- composition
- substrate
- container
- chamber
- kit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K5/00—Pens with ink reservoirs in holders, e.g. fountain-pens
- B43K5/18—Arrangements for feeding the ink to the nibs
- B43K5/1818—Mechanical feeding means, e.g. valves; Pumps
- B43K5/1827—Valves
- B43K5/1836—Valves automatically closing
- B43K5/1845—Valves automatically closing opened by actuation of the writing point
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43M—BUREAU ACCESSORIES NOT OTHERWISE PROVIDED FOR
- B43M11/00—Hand or desk devices of the office or personal type for applying liquid, other than ink, by contact to surfaces, e.g. for applying adhesive
- B43M11/06—Hand-held devices
- B43M11/08—Hand-held devices of the fountain-pen type
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium
Definitions
- This disclosure relates to coatings for corrosion protection, and more specifically to conversion coatings for corrosion protection of metal substrates.
- conversion coatings have been used to protect metals such as aluminum, zinc, cadmium, tin, magnesium, iron, copper, silver, and their alloys such as zinc-nickel, tin-zinc, etc.
- Conversion coating compositions have been commonly applied to large surface area substrates by immersion or spray application. Such techniques, however, can be cumbersome for touch-up application such as to repair abraded surfaces or at connection interfaces between assembled metal components.
- Small scale handheld application of conversion coatings has been performed with felt pen-style applicators.
- chromate conversion coatings utilizing hexavalent chromium have been effectively used to provide corrosion protection. However, the use of hexavalent chromium is largely in the process of being discontinued due to toxicity concerns.
- Touch-up conversion coatings based on trivalent chromium have been applied with felt pen-style applicators; however, such trivalent conversion coatings have been found to be less effective at preventing corrosion than conversion coatings based on hexavalent chromium.
- a kit for applying a coating comprises a first handheld container comprises a first liquid composition disposed therein that comprises a trivalent chromium salt.
- a first applicator is disposed in fluid communication with the first container and is configured to dispense the first composition.
- the kit also includes a second handheld container comprises a second liquid composition disposed therein comprising an oxidizing agent.
- a second applicator is disposed in fluid communication with the second container and is configured to dispense the second composition.
- a method of using the above-described kit comprises applying a coating of the first composition to a substrate, allowing a drying period of time to pass, applying the second composition to the coated substrate, and maintaining a wet layer of the second composition on the coated substrate for at least 0.5 minutes.
- a method of protecting a trivalent chromium conversion-coated substrate from corrosion comprises contacting the substrate with a porous pad disposed on an end of an oblong handheld housing in fluid communication with a chamber disposed within the housing, and dispensing a liquid composition comprising an oxidizing agent disposed in the chamber onto the substrate through the porous pad.
- FIG. 1 schematically depicts an example embodiment of a kit for applying a conversion coating.
- a first container in the form of housing 10a has a liquid composition comprising a trivalent chromium salt disposed in chamber 11a formed by the housing 10a and barrier 12a.
- a second container in the form of housing 10b has a liquid composition comprising an oxidizing agent disposed in chamber 11b formed by the housing 10b and barrier 12b.
- the housings 10a and 10b can be configured in various shapes, sizes, and forms in order to facilitate being held by hand during use. In some embodiments, the housings are configured in an oblong configuration as depicted in FIG. 1 .
- an oblong housing can have a maximum linear dimension in a cross-sectional plane perpendicular to the longest oblong axis in ranges having a lower endpoint of 5 mm, more specifically 10 mm, and even more specifically 15 mm, and an upper endpoint of 50 mm, more specifically 40 mm, more specifically 30 mm, and even more specifically 25 mm.
- an oblong housing can be configured as a cylinder. Such embodiments can also be referred to as a "coating pen” or "coating pens”.
- the cylinder can have a diameter in ranges having a lower endpoint of 5 mm, more specifically 10 mm, and even more specifically 15 mm, and an upper endpoint of 50 mm, more specifically of 40 mm, more specifically 30 mm, and even more specifically 25 mm.
- the above upper and lower endpoints can be independently combined to disclose various different ranges.
- the trivalent chromium salt composition can be an aqueous solution or a non-aqueous solution comprising trivalent chromium and various anions.
- exemplary anions include nitrate, sulfate, phosphate, and/or acetate.
- Specific exemplary trivalent chromium salts can include Cr 2 (SO 4 ) 3 , (NH) 4 Cr(SO 4 ) 2 , KCr(SO 4 ) 2 , CrF 3 Cr(NO3) 3 , and mixtures comprising any of the foregoing.
- the concentration of the trivalent chromium salt in the composition, per liter of solution, can range from about 0.01 g to about 22 g, more specifically from about 3 g to about 12 g, and even more specifically from about 4 g to about 8.0 g.
- concentration of the trivalent chromium salt in the composition can range from about 0.01 g to about 22 g, more specifically from about 3 g to about 12 g, and even more specifically from about 4 g to about 8.0 g.
- Embodiments of compositions and the application thereof to substrates are described in US Patent Nos. 5,304,257 , 5,374,347 , 6,375,726 , 6,511,532 , 6,521,029 , and 6,511,532 .
- Various additives and other materials can be included in the composition comprising trivalent chromium as disclosed in the patent literature, and the trivalent chromium salt composition can be selected from any of a number of known commercially-available compositions.
- the oxidizing agent can be a peroxide or a permanganate salt.
- the oxidizing agent is hydrogen peroxide (H 2 O 2 ).
- peroxides other than hydrogen peroxide include inorganic peroxides (e.g. Li 2 O 2 , Na 2 O 2 , K 2 O 2 , BaO 2 ), and organic peroxides (e.g., R-OO-R', R-OO-H, or RCO-OO-R', where R, and R' are organic groups).
- the oxidizing agent can be in aqueous or non-aqueous solutions at concentrations in ranges having a lower endpoint of 0.1 wt.%, more specifically 0.5 wt.%, more specifically 1.0 wt.%, more specifically 2.0 wt.%, more specifically 3.0 wt.%, and more specifically 4.0 wt.%, and an upper endpoint of 10.0 wt.%, more specifically 9.0 wt.%, more specifically 8 wt.%, more specifically 7 wt.%, more specifically 6 wt.%, more specifically 4 wt.%, and even more specifically 3.5 wt.%.
- the above upper and lower endpoints can be independently combined to disclose various different ranges.
- compositions in the chambers 11a, 11b can be dispensed by bringing the liquid compositions in the chambers 11a, 11b into contact with the dispensing applicators 14a, 14b, respectively.
- Each dispensing applicator 14a, 14b can independently be selected as a porous material configured to transport the liquid composition from the respective chamber 11a, 11b to a substrate in contact with the outer surface of the applicator 14a, 14b.
- the liquid composition can be brought into contact with the applicator 14a, 14b by bringing the dispensing applicator 14a, 14b into contact with a fixed-position surface (which can but does not have to be the substrate to be coated) and applying hand pressure on the housing 10a, 10b toward the surface to open the poppet valve 15a, 15b.
- the dispensing applicators 14a, 14b are slideably mounted in the housing 10a, 10b. At rest, the dispensing applicators 14a, 14b are biased away from the main body of the housing 10a, 10b by applicator biasing members (not shown) to an at-rest position as shown in FIG. 1 .
- This biasing force is transmitted through actuator 16a, 16b to apply an expansive force on the spring member 18a, 18b, which intern acts on the poppet valve 15a, 15b to keep it engaged on the barrier 12a, 12b and closed.
- actuator 16a, 16b Upon the application of hand pressure urging housing 10a, 10b toward the surface, the counteracting force of the surface acting on the dispensing each applicator 14a, 14b compresses the spring member 18a, 18b until the fully compressed spring and actuator engage against the poppet valve 15a, 15b and displace it away from the barrier 12a, 12b to open the poppet valve 15a, 15b.
- Hand pressure can be maintained to keep the poppet valve open for a period of time sufficient to charge a desired quantity of liquid into chamber 17a, 17b, at which point the hand pressure can be removed or relaxed so that the applicator biasing members again bias the applicators 14a, 14b to the at-rest position with the poppet valve 15a, 15b closed. Liquid in the chamber 17a, 17b can then continue to be delivered and spread on the substrate.
- the applicators 14a, 14b are not limited to porous pads.
- the applicators 14a, 14b could also be independently selected from brushes, rollers, nozzles, etc. When not in use, the applicators 14a, 14b can be covered with an air- and liquid-tight cap.
- FIG. 2 Another example embodiment of a kit is schematically depicted in FIG. 2 , in which the first and second containers are configured as first and second chambers 11a, 11b formed by housing 10 and barrier 20, with applicators 14a, 14b disposed at opposing ends of the oblong or cylindrical housing 10.
- the remaining components and features depicted in FIG. 2 and their operation are as in FIG. 1 , and do not require further explanation.
- the embodiment depicted in FIG. 2 provides additional technical benefits of convenience and efficiency, while reducing the potential for cross-contamination between the compositions by delivering the two distinct chemical compositions through applicators disposed on opposite ends of a coating pen.
- the applicator 14b can be formed from a material that is resistant to wicking of material from the coated substrate into the chamber 17b from which it could potentially infiltrate to the chamber 11b when the poppet valve 15b is open. Such materials can include surfaces that are resistant to wetting by the coated chromium salt composition.
- the poppet valve 15b can include check-valve features (not shown, but known in the valve art) to prevent migration of fluid from chamber 17b into chamber 11b.
- anti-contamination procedures can be followed such as draining or flushing the chamber 17b after application is complete, or using a surface other than the coated substrate for displacing the applicator 14b to charge the chamber 17b so that the poppet valve 15b is closed before the applicator 14b comes into contact with the coated substrate. Combinations of the above materials or procedures can be used as well.
- the first liquid composition comprising the trivalent chromium salt can be allowed to contact the substrate for a period of time before applying the second composition comprising the oxidizing agent, and in some embodiments the kit can include instructions to that effect.
- the amount of contact time can vary considerably depending on the ambient temperature and humidity, the specific properties of the applicator and the liquid composition, and the thickness with which it is applied. Any amount of contact time greater than zero can be used. In some embodiments, contact times can range from 1 minute to 5 minutes. In some embodiments, contact times can range from 1 minute to 3 minutes.
- a wet layer of the second liquid composition comprising the oxidizing agent is maintained on the coated substrate for a minimum period of time.
- minimum wet layer time limits can include 0.5 minutes, more specifically 1 minute, more specifically 1.5 minutes, more specifically 2 minutes, more specifically 3 minutes, more specifically 4 minutes, and even more specifically 5 minutes. Theoretically there is no maximum wet layer time; however, minimization of the opportunity costs of lost efficiency typically results in drying times that do not drastically exceed the specified minimum wet layer time.
- a wet layer of the second liquid composition comprising the oxidizing agent is maintained by making a plurality of passes over the substrate with the applicator 14b, and in some embodiments the kit can include instructions to that effect.
- the second liquid composition can be configured to maintain a wet layer for a target duration, e.g., through the inclusion of additives such as gel or thickening agents (e.g., fused silica, water soluble polymers) or lower volatility solvents.
- Moisture can also be retained by film-forming agents in the first composition such as sodium or potassium salts of hexafluorotitanic acid or hexafluorozirconic acid, or the selection of a chromium salt with colligative properties such as high solubility that render it inherently slow-drying.
- film-forming agents in the first composition such as sodium or potassium salts of hexafluorotitanic acid or hexafluorozirconic acid, or the selection of a chromium salt with colligative properties such as high solubility that render it inherently slow-drying.
Abstract
Description
- This disclosure relates to coatings for corrosion protection, and more specifically to conversion coatings for corrosion protection of metal substrates.
- Many metals are subject to corrosion, which can be exacerbated by exposure to corrosion-promoting environmental conditions such as high-chloride environments found in proximity to marine environments. Surface coatings have been used to provide protection against corrosion by imposing a physical barrier between the metal substrate and the surrounding environment. However, conventional polymer surface coatings can suffer from a number of problems such as inadequate or uneven thickness, pinholes and other gaps in coating coverage, and the necessity of extensive surface preparation of the substrate prior to application of the coating in order to provide adequate bonding between the coating and the substrate, in addition to the cost, time and complexity of applying the polymer coating.
- Metal surface treatments such as conversion coatings have been used to protect metals such as aluminum, zinc, cadmium, tin, magnesium, iron, copper, silver, and their alloys such as zinc-nickel, tin-zinc, etc. Conversion coating compositions have been commonly applied to large surface area substrates by immersion or spray application. Such techniques, however, can be cumbersome for touch-up application such as to repair abraded surfaces or at connection interfaces between assembled metal components. Small scale handheld application of conversion coatings has been performed with felt pen-style applicators. Historically, chromate conversion coatings utilizing hexavalent chromium have been effectively used to provide corrosion protection. However, the use of hexavalent chromium is largely in the process of being discontinued due to toxicity concerns. Touch-up conversion coatings based on trivalent chromium have been applied with felt pen-style applicators; however, such trivalent conversion coatings have been found to be less effective at preventing corrosion than conversion coatings based on hexavalent chromium.
- According to some aspects of this disclosure, a kit for applying a coating comprises a first handheld container comprises a first liquid composition disposed therein that comprises a trivalent chromium salt. A first applicator is disposed in fluid communication with the first container and is configured to dispense the first composition. The kit also includes a second handheld container comprises a second liquid composition disposed therein comprising an oxidizing agent. A second applicator is disposed in fluid communication with the second container and is configured to dispense the second composition.
- In some aspects, a method of using the above-described kit comprises applying a coating of the first composition to a substrate, allowing a drying period of time to pass, applying the second composition to the coated substrate, and maintaining a wet layer of the second composition on the coated substrate for at least 0.5 minutes.
- In some aspects, a method of protecting a trivalent chromium conversion-coated substrate from corrosion comprises contacting the substrate with a porous pad disposed on an end of an oblong handheld housing in fluid communication with a chamber disposed within the housing, and dispensing a liquid composition comprising an oxidizing agent disposed in the chamber onto the substrate through the porous pad.
- The subject matter which is regarded as the present disclosure is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the present disclosure are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
-
FIG. 1 is a schematic depiction of a cross-sectional view of an example embodiment of a kit for applying a conversion coating; and -
FIG. 2 is a schematic depiction of a cross-sectional view of another example embodiment of a kit for applying a conversion coating. - With reference now to the Figures,
FIG. 1 schematically depicts an example embodiment of a kit for applying a conversion coating. As shown inFIG. 1 , a first container in the form ofhousing 10a has a liquid composition comprising a trivalent chromium salt disposed inchamber 11a formed by thehousing 10a andbarrier 12a. A second container in the form ofhousing 10b has a liquid composition comprising an oxidizing agent disposed inchamber 11b formed by thehousing 10b andbarrier 12b. Thehousings FIG. 1 . In some embodiments, an oblong housing can have a maximum linear dimension in a cross-sectional plane perpendicular to the longest oblong axis in ranges having a lower endpoint of 5 mm, more specifically 10 mm, and even more specifically 15 mm, and an upper endpoint of 50 mm, more specifically 40 mm, more specifically 30 mm, and even more specifically 25 mm. In some embodiments, an oblong housing can be configured as a cylinder. Such embodiments can also be referred to as a "coating pen" or "coating pens". In some embodiments, the cylinder can have a diameter in ranges having a lower endpoint of 5 mm, more specifically 10 mm, and even more specifically 15 mm, and an upper endpoint of 50 mm, more specifically of 40 mm, more specifically 30 mm, and even more specifically 25 mm. The above upper and lower endpoints can be independently combined to disclose various different ranges. - In some embodiments, the trivalent chromium salt composition can be an aqueous solution or a non-aqueous solution comprising trivalent chromium and various anions. Exemplary anions include nitrate, sulfate, phosphate, and/or acetate. Specific exemplary trivalent chromium salts can include Cr2(SO4)3, (NH)4Cr(SO4)2, KCr(SO4)2, CrF3 Cr(NO3)3, and mixtures comprising any of the foregoing. The concentration of the trivalent chromium salt in the composition, per liter of solution, can range from about 0.01 g to about 22 g, more specifically from about 3 g to about 12 g, and even more specifically from about 4 g to about 8.0 g. Embodiments of compositions and the application thereof to substrates are described in
US Patent Nos. 5,304,257 ,5,374,347 ,6,375,726 ,6,511,532 ,6,521,029 , and6,511,532 . Various additives and other materials can be included in the composition comprising trivalent chromium as disclosed in the patent literature, and the trivalent chromium salt composition can be selected from any of a number of known commercially-available compositions. - In some embodiments, the oxidizing agent can be a peroxide or a permanganate salt. In some embodiments, the oxidizing agent is hydrogen peroxide (H2O2). Examples of peroxides other than hydrogen peroxide include inorganic peroxides (e.g. Li2O2, Na2O2, K2O2, BaO2), and organic peroxides (e.g., R-OO-R', R-OO-H, or RCO-OO-R', where R, and R' are organic groups). The oxidizing agent can be in aqueous or non-aqueous solutions at concentrations in ranges having a lower endpoint of 0.1 wt.%, more specifically 0.5 wt.%, more specifically 1.0 wt.%, more specifically 2.0 wt.%, more specifically 3.0 wt.%, and more specifically 4.0 wt.%, and an upper endpoint of 10.0 wt.%, more specifically 9.0 wt.%, more specifically 8 wt.%, more specifically 7 wt.%, more specifically 6 wt.%, more specifically 4 wt.%, and even more specifically 3.5 wt.%. The above upper and lower endpoints can be independently combined to disclose various different ranges.
- The compositions in the
chambers chambers applicators dispensing applicator respective chamber applicator applicator applicator housing poppet valve applicators housing applicators housing FIG. 1 . This biasing force is transmitted throughactuator spring member poppet valve barrier pressure urging housing applicator spring member poppet valve barrier poppet valve chamber applicators poppet valve chamber applicators applicators applicators - Another example embodiment of a kit is schematically depicted in
FIG. 2 , in which the first and second containers are configured as first andsecond chambers housing 10 andbarrier 20, withapplicators cylindrical housing 10. The remaining components and features depicted inFIG. 2 and their operation are as inFIG. 1 , and do not require further explanation. The embodiment depicted inFIG. 2 provides additional technical benefits of convenience and efficiency, while reducing the potential for cross-contamination between the compositions by delivering the two distinct chemical compositions through applicators disposed on opposite ends of a coating pen. - In some embodiments, avoidance of contamination from chromium salts on the substrate being coated into the second container comprising the oxidizing agent composition is promoted by contamination-avoiding materials or components. In some embodiments, the
applicator 14b can be formed from a material that is resistant to wicking of material from the coated substrate into thechamber 17b from which it could potentially infiltrate to thechamber 11b when thepoppet valve 15b is open. Such materials can include surfaces that are resistant to wetting by the coated chromium salt composition. In some embodiments, thepoppet valve 15b can include check-valve features (not shown, but known in the valve art) to prevent migration of fluid fromchamber 17b intochamber 11b. In some embodiments, anti-contamination procedures can be followed such as draining or flushing thechamber 17b after application is complete, or using a surface other than the coated substrate for displacing theapplicator 14b to charge thechamber 17b so that thepoppet valve 15b is closed before theapplicator 14b comes into contact with the coated substrate. Combinations of the above materials or procedures can be used as well. - In some embodiments, the first liquid composition comprising the trivalent chromium salt can be allowed to contact the substrate for a period of time before applying the second composition comprising the oxidizing agent, and in some embodiments the kit can include instructions to that effect. The amount of contact time can vary considerably depending on the ambient temperature and humidity, the specific properties of the applicator and the liquid composition, and the thickness with which it is applied. Any amount of contact time greater than zero can be used. In some embodiments, contact times can range from 1 minute to 5 minutes. In some embodiments, contact times can range from 1 minute to 3 minutes.
- In some embodiments, a wet layer of the second liquid composition comprising the oxidizing agent is maintained on the coated substrate for a minimum period of time. Although this disclosure is not bound by any theory of operation, it is believed that the wet layer promotes chemical interaction of the oxidizing agent with the trivalent chromium salt composition. Examples of minimum wet layer time limits can include 0.5 minutes, more specifically 1 minute, more specifically 1.5 minutes, more specifically 2 minutes, more specifically 3 minutes, more specifically 4 minutes, and even more specifically 5 minutes. Theoretically there is no maximum wet layer time; however, minimization of the opportunity costs of lost efficiency typically results in drying times that do not drastically exceed the specified minimum wet layer time. In some embodiments, a wet layer of the second liquid composition comprising the oxidizing agent is maintained by making a plurality of passes over the substrate with the
applicator 14b, and in some embodiments the kit can include instructions to that effect. In some embodiments, the second liquid composition can be configured to maintain a wet layer for a target duration, e.g., through the inclusion of additives such as gel or thickening agents (e.g., fused silica, water soluble polymers) or lower volatility solvents. Moisture can also be retained by film-forming agents in the first composition such as sodium or potassium salts of hexafluorotitanic acid or hexafluorozirconic acid, or the selection of a chromium salt with colligative properties such as high solubility that render it inherently slow-drying. - While the present disclosure has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the present disclosure is not limited to such disclosed embodiments. Rather, the present disclosure can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the scope of the present invention as defined by the claims. Additionally, while various embodiments of the present disclosure have been described, it is to be understood that aspects of the present disclosure may include only some of the described embodiments. Accordingly, the present disclosure is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
Claims (15)
- A kit for applying a conversion coating, comprising:a first handheld container (10a) comprising a first liquid composition disposed therein that comprises a trivalent chromium salt;a first applicator (14a) in fluid communication with the first container configured to dispense the first composition;a second handheld container (10b) comprising a second liquid composition disposed therein comprising an oxidizing agent; anda second applicator (14b) in fluid communication with the second container configured to dispense the second composition.
- The kit of claim 1, comprising a housing (10) that comprises a first chamber (11a) as said first container and a second chamber as said second container (11b).
- The kit of claim 1, comprising an oblong handheld housing that comprises a first chamber (11a) as said first container and a second chamber (11b) as said second container, the first applicator (14a) comprising a porous pad disposed at a first end of the oblong housing in fluid communication with the first chamber, and the second applicator (14b) comprising a porous pad disposed at a second end of the oblong housing in fluid communication with the second chamber.
- The kit of claim 1, comprising a first housing (10a) that comprises a first chamber (11a) as said first container, and a second housing (10b), separate from the first housing, that comprises a second chamber (11b) as the second container.
- The kit of claim 4, comprising a first oblong handheld housing that comprises a first chamber as said first container and the first applicator (14a) comprising a porous pad disposed at an end of the first oblong housing in fluid communication with the first chamber, and a second oblong housing that comprises a second chamber as said second container and the second applicator (14b) disposed at an end of the second oblong housing comprising a porous pad in fluid communication with the second chamber.
- The kit of any of claims 1-5, wherein the applicators are each independently selected from porous pads, brushes, rollers, or nozzles.
- The kit of any of claims 1-6, wherein the applicator in fluid communication with the second container is configured to make contact with a substrate to apply the second composition to the substrate, and wherein the second container and the applicator in fluid communication with it are configured to prevent fluid communication from the applicator to the second container.
- The kit of any of claims 1-7, wherein the oxidizing agent is selected from a peroxide, a permanganate salt, or combinations comprising the foregoing.
- The kit of claim 8, wherein the oxidizing agent comprises hydrogen peroxide.
- The kit of claim 9, wherein the second composition comprises 0.1 wt.% to 10 wt.% hydrogen peroxide, based on the total weight of the second composition.
- The kit of any of claims 1-10, wherein the second liquid composition is configured to stay wet on a substrate for at least 0.5 minutes.
- The kit of any of claims 1-11, further comprising instructions to apply a plurality of passes of the second composition to a substrate at intervals configured to maintain a wet layer of the second composition on the substrate for at least 0.5 minutes, or instructions to allow a drying period of time after application of the first composition to a substrate before applying the second composition, or both instructions to apply a plurality of passes of the second composition to a substrate at intervals configured to maintain a wet layer of the second composition on the substrate for at least 0.5 minutes and instructions to allow a drying period of time after application of the first composition to a substrate before applying the second composition.
- A method of using the kit of any of claims 1-12, comprising applying a coating of the first composition to a substrate, allowing a drying period of time to pass, applying the second composition to the coated substrate, and maintaining a wet layer of the second composition on the coated substrate for at least 0.5 minutes.
- A method of protecting a trivalent chromium conversion-coated substrate from corrosion, comprising contacting the substrate with a porous pad disposed on an end of an oblong handheld housing in fluid communication with a chamber disposed within the housing, and dispensing a liquid composition comprising an oxidizing agent disposed in the chamber onto the substrate through the porous pad, and maintaining a wet layer of the liquid composition on the substrate for at least 0.5 minutes.
- The method of claims 13 or 14, comprising applying a plurality of passes of the second composition or the liquid composition, respectively, to the substrate at intervals to maintain a wet layer on the substrate for at least 0.5 minutes, or optionally for at least 3 minutes or for at least 5 minutes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/151,114 US20170327955A1 (en) | 2016-05-10 | 2016-05-10 | Conversion coating treatment |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3243928A1 true EP3243928A1 (en) | 2017-11-15 |
Family
ID=58709253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17170451.3A Withdrawn EP3243928A1 (en) | 2016-05-10 | 2017-05-10 | Conversion coating treatment |
Country Status (3)
Country | Link |
---|---|
US (1) | US20170327955A1 (en) |
EP (1) | EP3243928A1 (en) |
JP (1) | JP2017203215A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2022531931A (en) * | 2019-05-10 | 2022-07-12 | ヘンケル アイピー アンド ホールディング ゲゼルシャフト ミット ベシュレンクテル ハフツング | Applicator for harmful substances |
US11951506B2 (en) | 2022-09-08 | 2024-04-09 | Hamilton Sundstrand Corporation | Two part applicator pen |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5304257A (en) | 1993-09-27 | 1994-04-19 | The United States Of America As Represented By The Secretary Of The Navy | Trivalent chromium conversion coatings for aluminum |
US5374347A (en) | 1993-09-27 | 1994-12-20 | The United States Of America As Represented By The Secretary Of The Navy | Trivalent chromium solutions for sealing anodized aluminum |
WO1999026794A1 (en) * | 1997-11-24 | 1999-06-03 | Jacqueline Fulop | Marking and eradicating instrument and method of use of same |
US6048921A (en) * | 1994-12-23 | 2000-04-11 | Henkel Corporation | Method for applying conversion coating with wick applicator |
US6217935B1 (en) * | 1991-11-22 | 2001-04-17 | Henkel Corporation | Method and hand held pen type applicator for applying hazardous chemicals |
US6375726B1 (en) | 2000-10-31 | 2002-04-23 | The United States Of America As Represented By The Secretary Of The Navy | Corrosion resistant coatings for aluminum and aluminum alloys |
US6511532B2 (en) | 2000-10-31 | 2003-01-28 | The United States Of America As Represented By The Secretary Of The Navy | Post-treatment for anodized aluminum |
US6521029B1 (en) | 2000-10-31 | 2003-02-18 | The United States Of America As Represented By The Secretary Of The Navy | Pretreatment for aluminum and aluminum alloys |
DE102009039887A1 (en) * | 2009-09-03 | 2011-03-17 | Innovent E.V. | Method for surface-treatment of magnesium-containing component, comprises applying a chemical passivating solution that consists of thixotropic agent, on a part of the surface and leaving the passivating solution on the surface |
-
2016
- 2016-05-10 US US15/151,114 patent/US20170327955A1/en not_active Abandoned
-
2017
- 2017-05-10 EP EP17170451.3A patent/EP3243928A1/en not_active Withdrawn
- 2017-05-10 JP JP2017093567A patent/JP2017203215A/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6217935B1 (en) * | 1991-11-22 | 2001-04-17 | Henkel Corporation | Method and hand held pen type applicator for applying hazardous chemicals |
US5304257A (en) | 1993-09-27 | 1994-04-19 | The United States Of America As Represented By The Secretary Of The Navy | Trivalent chromium conversion coatings for aluminum |
US5374347A (en) | 1993-09-27 | 1994-12-20 | The United States Of America As Represented By The Secretary Of The Navy | Trivalent chromium solutions for sealing anodized aluminum |
US6048921A (en) * | 1994-12-23 | 2000-04-11 | Henkel Corporation | Method for applying conversion coating with wick applicator |
WO1999026794A1 (en) * | 1997-11-24 | 1999-06-03 | Jacqueline Fulop | Marking and eradicating instrument and method of use of same |
US6375726B1 (en) | 2000-10-31 | 2002-04-23 | The United States Of America As Represented By The Secretary Of The Navy | Corrosion resistant coatings for aluminum and aluminum alloys |
US6511532B2 (en) | 2000-10-31 | 2003-01-28 | The United States Of America As Represented By The Secretary Of The Navy | Post-treatment for anodized aluminum |
US6521029B1 (en) | 2000-10-31 | 2003-02-18 | The United States Of America As Represented By The Secretary Of The Navy | Pretreatment for aluminum and aluminum alloys |
DE102009039887A1 (en) * | 2009-09-03 | 2011-03-17 | Innovent E.V. | Method for surface-treatment of magnesium-containing component, comprises applying a chemical passivating solution that consists of thixotropic agent, on a part of the surface and leaving the passivating solution on the surface |
Also Published As
Publication number | Publication date |
---|---|
US20170327955A1 (en) | 2017-11-16 |
JP2017203215A (en) | 2017-11-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ES2730005T3 (en) | Wet wet process and chrome-free acid solution for the corrosion protection treatment of steel surfaces | |
US11149353B2 (en) | Anti-corrosion and/or passivation compositions for metal-containing substrates and methods for making, enhancing, and applying the same | |
KR102255735B1 (en) | System and method for metal substrate treatment through thin film pretreatment and sealing composition | |
CA2312807A1 (en) | Chromium-free corrosion protection agent and method for providing corrosion protection | |
US8728251B2 (en) | Treatment solution for coating metal surface | |
EP3243928A1 (en) | Conversion coating treatment | |
JPH02118081A (en) | Pretreatment of metal surface | |
CN115595569A (en) | Azole compounds as corrosion inhibitors | |
CN109112555A (en) | Alkaline cleaning composition for metal base | |
CN109563629A (en) | For handling the system and method for metal base | |
CN109642326A (en) | Pretreatment compositions | |
CN102489435A (en) | Coating process for vehicle wheel with finish-tuned and polished surface | |
US6027578A (en) | Non-chrome conversion coating | |
JP2012097329A (en) | Finishing agent for chemical film containing no hexavalent chromium | |
ES2905136T3 (en) | Chromium (III)-containing treatment solution for a method for generating an anticorrosive coating layer, concentrate of said treatment solution and a method for generating an anticorrosive coating layer | |
US10415140B2 (en) | Two-stage pre-treatment of aluminum comprising pickling and passivation | |
CN106232872B (en) | The coloured conversion coatings of non-chromate for aluminium | |
WO2018006270A1 (en) | Chromium-free aluminum conversion coating agent, aluminum material, and surface conversion coating treatment method | |
JP6594678B2 (en) | Surface treatment agent, surface treatment method, and surface-treated metal material | |
KR100491122B1 (en) | Method for manufacturing green chrome-free steel plate with a fingerprint-resistance | |
TWI531679B (en) | Steel pre-paint treatment composition | |
Oki | Performance of Tannin/Glycerol-Chromate hybrid conversion coating on aluminium | |
RU2510432C1 (en) | Composition for removing rust and preserving surfaces of metal structures and pipes before painting | |
AU2003302934A1 (en) | Aqueous coating solutions and method for the treatment of a metal surface | |
CN106047127A (en) | Sealing agent for corrosion resistance of zinc-plated spring and preparation method thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20180515 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20191021 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20211008 |