EP0966737A4 - Corrosion protection of aluminum and aluminum alloys using emeraldine base polyaniline - Google Patents
Corrosion protection of aluminum and aluminum alloys using emeraldine base polyanilineInfo
- Publication number
- EP0966737A4 EP0966737A4 EP98910331A EP98910331A EP0966737A4 EP 0966737 A4 EP0966737 A4 EP 0966737A4 EP 98910331 A EP98910331 A EP 98910331A EP 98910331 A EP98910331 A EP 98910331A EP 0966737 A4 EP0966737 A4 EP 0966737A4
- Authority
- EP
- European Patent Office
- Prior art keywords
- group
- coating
- substance
- metal piece
- aluminum
- 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- Withdrawn
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/02—Polyamines
-
- 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
- C23C22/02—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 using non-aqueous solutions
Definitions
- the present invention relates to the protection of aluminum and its alloys from corrosion.
- EB emeraldine base polyaniline
- containing film protects the aluminum surface it is coated on, but may also protect the
- the present invention includes a coating composition for
- the composition comprises
- oligomers may be trimers, tetramers,
- emeraldine base may range from about .3 to about .75 units.
- emeraldine base or oligomers thereof may also be provided with additional ring substituents for purposes such as providing polymer cross linking, improved or in
- substituents may be, for example, carbonate groups, alkyl groups, epoxy groups, and
- the coating composition also include a
- polymers/oligomers mentioned herein may also offer corrosion protection of
- corrosion protecting polymer/oligomer also is likely to be utilized in order to improve
- the present invention also includes a coated metal piece which may be of
- the coated metal piece also has on at least one such surface a coating
- the coating may also be provided with a
- coating sealant such as a lacquer or epoxy sealant.
- the present invention also includes, in broadest terms, a coating composition
- composition for protecting aluminum and alloys thereof from corrosion, the composition
- oligomers comprising at least one substance selected from the group consisting of sulfonated polyaniline and salts and oligomers thereof.
- oligomers may include trimers,
- the sulfonated polyaniline coatings may also be born by resin such as acrylic
- the sulfonated polyaniline coatings will have a degree of sulfonation
- sulfonated polyaniline may also be provided with additional ring substituents for
- substituents may be, for example, carbonate
- the present invention also includes a coated metal piece comprising a metal
- said metal piece selected from the group consisting of aluminum and alloys thereof, said metal piece
- oligomers may be trimers
- the coated metal piece may also have a coating sealant atop the coating, and
- sealants may be, for instance, lacquers and epoxy sealants.
- Figure 1 shows the schematic chemical structure of emeraldine base
- Figure 2 shows the schematic chemical structure of sulfonated (100%)
- polyaniline in the emeraldine base form.
- Figure 3 shows the XPS Al 2p core level depth profile of a polished A13003
- Figure 4 shows the XPS Al 2p core level spectra of (a) an A13O03 sample
- Figure 5 shows the XPS Al 2p core level spectra of (a) A13003 exposed to
- Figure 6 shows a graph of a potentiodynamic scan showing the results of a
- the surface was polished with 600 grit emery paper and degreased
- Figure 7 shows a graph of a potentiodynamic scan showing the results of a
- Figure 8 shows a graph of a potentiodynamic scan showing the results of a
- Figure 9 shows a graph of a potentiodynamic scan showing the results of a
- Example 1 EB films were coated onto A13003 alloys and were found to reduce the
- samples consisting of Al vapor deposited onto glass.
- the acid used was 0.1 M HCl. After the acid exposure, the samples were
- X-ray photoelectron spectroscopy was carried using a VG Scientific
- depth profiling was carried out both the A13003 side and the EB side.
- metallic Al being the dominating feature at depths of -10 nm giving an estimate of the
- the unprotected A13003 sample (a) has a
- top coats typically used in the paint industry to protect the primer layer An example
- the unprotected sample has a distinct shoulder at -78 eV
- thickness of the EB films were -20 micrometers, and -40 micrometers for the trimer
- the potentiostat used for the potentiodynamic experiments was a Gamry Instruments model PC3 potentiostat galvanostat equipped with the CMS 100 corrosion system
- the scanning speed for the experiments was 5 mV/s.
- Trimer top coated A12024-T3 coupons had open circuit potentials of - -0.75 V vs
- the aluminum alloy is ennobled in the presence of an EB or a trimer
- top coat i.e., some form of anodic protection is taking place.
- trimer films have throwing power, i.e., the ability to protect a metal against
- Fig. 8 are shown the potentiodynamic scans for scribed EB and epoxy, and the
- trimer samples was reduced by an order of magnitude compared to the epoxy- coated coupons.
- oligomers of EB and SPAN trimers, tetramers, octamers, hexdecamers, etc.
Abstract
The present invention includes a coating composition for protecting aluminium and alloys thereof from corrosion. The composition comprises at least one substance selected from the group consisting of emeraldine base polyaniline and oligomers thereof, or sulfonated polyanilines and salts and oligomers thereof. The invention also includes an aluminum metal or aluminum alloy piece bearing such a coating.
Description
CORROSION PROTECTION OF ALUMINUM AND ALUMINUM ALLOYS USING EMERALDINE BASE POLYANILINE
Related Application Data
This application claims the benefit of U.S. Provisional Application Serial No.
60/036,685 filed on March 11, 1997, hereby incorporated herein by reference.
Technical Field of the Invention
The present invention relates to the protection of aluminum and its alloys from corrosion.
Background of the Invention
Aluminum and its alloys are widely used in a variety of applications,
including aerospace and automotive construction, building construction, and public utilities.
Many of these applications involve the use of aluminum and its alloys in
exposure to the environment or otherwise in corrosive atmospheres. Aluminum
typically undergoes relatively rapid oxidation which, over time, can detract from its
functional and/or structural viability, and its appearance.
Accordingly, to preserve the functional and/or structural viability, as well as
the appearance in some cases, of aluminum and its alloys, it is desirable to reduce or eliminate the corrosion of aluminum
Although the advantages and goals of the present invention are described with
reference to aluminum and its alloys, the present invention is not limited to either
general or specific uses. Indeed, the potential uses of the present invention are
numerous as may become apparent to one of ordinary skill in the fields of endeavor to
which the present invention might be applied.
Accordingly, additional advantages or the solution to other problems may
become apparent to one of ordinary skill in these arts from the present disclosure or
through practice of the present invention.
Summary of the Invention
Aluminum and aluminum alloys normally prone to corrosion when subjected
to potentially corrosive conditions (acid, alkaline or neutral) can be protected by coats
of emeraldine base polyaniline (EB) (see Figure 1), and derivatives thereof. The EB
containing film protects the aluminum surface it is coated on, but may also protect the
uncoated surface areas of the metal object, including the opposite side of the coated
surface, the sides and edges.
In broadest terms, the present invention includes a coating composition for
protecting aluminum and alloys thereof from corrosion. The composition comprises
at least one substance selected from the group consisting of emeraldine base
polyanilines and oligomers thereof. Such oligomers may be trimers, tetramers,
octamers, hexadecamers, and/or mixtures thereof. The fraction of imine units in the
emeraldine base may range from about .3 to about .75 units. The ring structures of
emeraldine base or oligomers thereof may also be provided with additional ring
substituents for purposes such as providing polymer cross linking, improved or in
some cases even reduced solubility and/or better bonding with the carrier resin. Such
substituents may be, for example, carbonate groups, alkyl groups, epoxy groups, and
combinations thereof.
Nominally, it will be preferred that the coating composition also include a
resin which is used as a carrier for the active ingredient. Examples of such resin
include acrylic and epoxy resins. Resins and blends containing one or more of the
polymers/oligomers mentioned herein may also offer corrosion protection of
aluminum and aluminum alloys. In most applications, a top coat sealing the corrosion
protecting polymers/oligomers from the environment is likely to be used, enhancing
the durability of the corrosion protecting coat.
Adhesion-improving surface pretreatment prior to the coating with the
corrosion protecting polymer/oligomer also is likely to be utilized in order to improve
the effectiveness of the protective coat.
The present invention also includes a coated metal piece which may be of
aluminum or any alloy thereof which has at least one surface adapted to receive a
coating. The coated metal piece also has on at least one such surface a coating
comprising at least one substance selected from the group consisting of emeraldine
base polyaniline and oligomers thereof. The coating may also be provided with a
coating sealant such as a lacquer or epoxy sealant.
The present invention also includes, in broadest terms, a coating composition
for protecting aluminum and alloys thereof from corrosion, the composition
comprising at least one substance selected from the group consisting of sulfonated
polyaniline and salts and oligomers thereof. Such oligomers may include trimers,
tetramers, octamers, hexadecamers, and/or mixtures thereof.
The sulfonated polyaniline coatings may also be born by resin such as acrylic
and epoxy resins.
Typically the sulfonated polyaniline coatings will have a degree of sulfonation
in the range of from about 50% to about 100% (i.e. expressed in terms of the
percentage of ring structures bearing a sulfonate group). The ring structures of the
sulfonated polyaniline may also be provided with additional ring substituents for
purposes such as providing polymer cross linking and/or better sulfonation or
bonding with the carrier resin. Such substituents may be, for example, carbonate
groups, alkyl groups, epoxy groups, and combinations thereof.
The present invention also includes a coated metal piece comprising a metal
selected from the group consisting of aluminum and alloys thereof, said metal piece
having at least one surface adapted to receive a coating; and a coating on said surface
which comprises at least one substance selected from the group consisting of
sulfonated polyaniline and oligomers thereof. Such oligomers may be trimers,
tetramers, octamers, hexadecamers, and/or mixtures thereof.
The coated metal piece may also have a coating sealant atop the coating, and
such sealants may be, for instance, lacquers and epoxy sealants.
Brief Description of the Drawings
Figure 1 shows the schematic chemical structure of emeraldine base
polyaniline (EB).
Figure 2 shows the schematic chemical structure of sulfonated (100%)
polyaniline (SPAN) in the emeraldine base form.
Figure 3 shows the XPS Al 2p core level depth profile of a polished A13003
sample that has not been exposed to a corrosive environment.
Figure 4 shows the XPS Al 2p core level spectra of (a) an A13O03 sample
immersed in the 0.1 M HCl acid bath for 2 hours, (b) an EB/A13003 sample immersed
in the 0.1 M HCl acid bath for 2 hours (the metal side being depth profiled), and (c) an
A13003 control sample not exposed to a corrosive environment. Data were acquired
after argon ion sputtering in ultra-high vacuum to a depth of about 15 nm.
Figure 5 shows the XPS Al 2p core level spectra of (a) A13003 exposed to
HCl and (b) the uncoated metal side of A13003/EB exposed to HCl where the EB film
failed during the acid exposure. Data were acquired after argon ion sputtering in
ultra-high vacuum to a depth of about 28 nm.
Figure 6 shows a graph of a potentiodynamic scan showing the results of a
potentiodynamic study on an uncoated aluminum 2024-T3 sample and an emeraldine
base-coated aluminum 2024-T3 sample, in accordance with one embodiment of the
present invention. The surface was polished with 600 grit emery paper and degreased
with ethanol before application of any coating. Reproducibility is evidenced by scans
of multiple samples.
Figure 7 shows a graph of a potentiodynamic scan showing the results of a
potentiodynamic study on an uncoated aluminum 2024-T3 sample and an emeraldine
base trimer-coated aluminum 2024-T3 sample, in accordance with one embodiment of
the present invention. Reproducibility is evidenced by scans of multiple samples.
Figure 8 shows a graph of a potentiodynamic scan showing the results of a
potentiodynamic study on a scribed emeraldine base-coated aluminum 2024-T3
sample in accordance with one embodiment of the present invention, as compared to
an epoxy-coated aluminum 2024-T3 sample. The surface was polished with 600 grit
emery paper and degreased with ethanol before application of any coating.
Reproducibility is evidenced by scans of multiple samples.
Figure 9 shows a graph of a potentiodynamic scan showing the results of a
potentiodynamic study on a scribed emeraldine base trimer-coated aluminum 2024-T3
sample in accordance with one embodiment of the present invention, as compared to
an epoxy-coated aluminum 2024-T3 sample. The surface was polished with 600 grit
emery paper and degreased with ethanol before application of any coating.
Reproducibility is evidenced by scans of multiple samples.
Detailed Description of the Preferred Embodiments
In accordance with the foregoing summary of the invention, the following
presents a detailed description of the one embodiment of the invention which is also
presently considered to be the best mode of the invention.
Example 1
EB films were coated onto A13003 alloys and were found to reduce the
corrosion damage on the uncoated backside as well as the coated side of the Al
samples when immersed in an 0.1 M HCl bath at 80 C for 2 hours, as compared to
corresponding uncoated A13003 control samples. Likewise, samples of pure
aluminum vapor deposited onto EB coated glass slides were also found to be more
resistive to corrosion when exposed to hot acid vapor (0.1 M HCl) than the control
samples consisting of Al vapor deposited onto glass.
Sample Preparation
Samples consisting of A13003 (alloy) coupons were polished on both sides
using emery paper and subsequently ultrasound washed in acetone and propanol.
Some of the coupons were then coated by emeraldine base polyaniline (EB) in an N-
methylpyrrolidinone solution through drop-coating and dried over night under a hood.
EB films also were drop-coated from N-methylpyrrolidinone solution onto glass
slides and dried over night under a hood. Thin (-1000 A) Al films were then vapor
deposited onto the EB coated glass slides and non-coated control glass slides.
The samples to be corroded where immersed in an acid bath kept at 80° C for
two hours. The acid used was 0.1 M HCl. After the acid exposure, the samples were
quickly blow dried with N2 gas before being inserted into the UHV chamber.
Experimental Procedure
X-ray photoelectron spectroscopy (XPS) was carried using a VG Scientific
ESCALAB Mkll system and Mg Kα X-rays (1253.6 eV). Depth profiling was carried
out using an argon ion sputtering gun. The spectroscopy was carried out at a
background pressure of 10' mbar. XPS depth profiling experiments were carried out
on the metal side for EB/A13003 and Al/EB/glass samples as well as for A13003 and
Al/glass control samples exposed to the corrosive environments mentioned in the
sample preparation section. Depth profiling was carried out for polished Al and
A13003 samples that had not been exposed to acid. In the case of the EB/A13003
samples, depth profiling was carried out both the A13003 side and the EB side.
Results
In Figure 3 is depicted the Al 2p core level depth profile of a polished A13003
sample that has not been exposed to a corrosive environment. The peak situated at
72.9 eV represents metallic Al and the peak at 76 eV results from Al2O3. The relative
amount of metallic Al increases as the surface Al2O3 is sputtered away, with the
metallic Al being the dominating feature at depths of -10 nm giving an estimate of the
oxide layer's thickness. When aluminum and aluminum alloys are exposed to
corrosive environments, the protective Al2O3 oxide layer is damaged and Al + ions
from the underlying metal bulk are dissolved into the solution. Various new chemical
species are formed at the surface layers, including chlorine containing aluminum
hydroxides and aluminum oxides, with binding energies ranging from 76-79 eV. This
new feature in the Al 2p core level spectrum will thus be a signature of corrosion, and
the depth into the sample with which it extends will give an estimate of the severity of
the corrosion damage.
In Figure 4 is shown the Al 2p core level spectra of (a) an A13003 sample
immersed in the 0.1 M HCl acid bath for 2 hours, (b) an EB/A13003 sample immersed
in the 0.1 M HCl acid bath for 2 hours (the metal side being depth profiled), and (c) an
A13003 control sample not exposed to a corrosive environment. All spectra were
taken at a depth of -15 nm. Whereas the intensities of the features at 75 eV and
higher binding energies are practically the same for the control sample (c) and the EB
protected one (b) with only a slight tail extending from 77 eV and out signifying the
possible existence of corrosion products, the unprotected A13003 sample (a) has a
much more intense peak in the non-metallic energy range giving evidence to a
corrosion attack. Qualitatively, the same results were obtained for the pure Al
samples, where the features in the Al 2p spectrum signifying corrosion damage
extended much further down into the Al films for the unprotected samples than for the
EB protected ones.
A series of immersion tests were made and it was noted that the adhesion
between the polymer and oligomer films, EB included, and the aluminum alloy
substrates was quite poor leading to variations in the effectiveness of corrosion
protection depending on the rate of film failure. In a practical application, this
problem can be circumvented by crosslinking the polymers/oligomers, applying them
in blends, pretreating the aluminum alloy surface to increase the adhesion or applying
top coats typically used in the paint industry to protect the primer layer. An example
of such a case where parts of the EB film failed during the acid exposure is shown in
Figure 5. Here Al 2p spectra of (a) unprotected A13003 and (b) A13003/EB samples
were taken at a depth of ~28 nm. Unlike the case depicted in Figure 4, the peak
signifying corrosion damage (76-78 eV) is of higher intensity than the metallic peak
(-73 eV), indicating that the corrosion protection was weaker in this case. The EB
protected sample, however, still shows less corrosion damage as is evident from the
larger relative metallic/corrosion damage peak intensity as compared to the
unprotected sample. The unprotected sample has a distinct shoulder at -78 eV,
significantly broadening the non-metallic peak giving further proof of corrosion
damage since the number of different Al containing oxides and hydroxides has
increased compared to the A13003/EB sample. It should be mentioned that in all
cases studied, there was always some corrosion damage visible. This is not
surprising, since, although not limited by theory, it is believed that the corrosion
protection is of anodic origin (although based on our EB/steel studies we expect that
there are other factors as well that contribute to the corrosion protection when using
this class of polymers/oligomers) and anodic protection only reduces the corrosion
current, generally not bringing it to zero.
Potentiodynamic Studies
For the electrochemical experiments, EB and trimer films were drop cast from
N-methylpyrrolidinone solutions on to 1.5 x 1.5 x 0.19 cm3 A12024-T3 coupons that
had been polished with 600 grit emery paper and degreased with ethanol. The
thickness of the EB films were -20 micrometers, and -40 micrometers for the trimer
films. The samples were stored for up to 24 hours in air prior to the electrochemical
experiments. The EB-coated, trimer-coated and non-coated A12024-T3 samples were
placed in a holder at the bottom of a vessel with the coated side exposed to a deaerated
(argon) 0.1 M NaCl solution. The (coated) A12024-T3 coupons functioned as the
working electrode in a three electrode set up. A platinum foil was used as the counter
electrode and a saturated calomel electrode (SCE) was used as the reference electrode.
The potentiostat used for the potentiodynamic experiments was a Gamry Instruments
model PC3 potentiostat galvanostat equipped with the CMS 100 corrosion system
software. The scanning speed for the experiments was 5 mV/s.
The potentiodynamic experiments carried out in a deaerated 0.1M NaCl
solution gave open circuit potentials of - -0.9 V vs SCE for the non-coated A12024-
T3 coupons and - -0.5 V vs SCE for the EB-top-coated A12024-T3 samples, Fig. 6.
Trimer top coated A12024-T3 coupons had open circuit potentials of - -0.75 V vs
SCE, see Fig. 7. The aluminum alloy is ennobled in the presence of an EB or a trimer
top coat, i.e., some form of anodic protection is taking place. The pitting potential
was —0.6 V for the uncoated A12024-T3 coupons. In contrast, no obvious pitting
was found to occur for the EB-coated or trimer coated samples, even at potentials as
high as 0.2 V.
Furthermore, the corrosion current was more than an order of magnitude lower
for the EB-coated coupons than the non-coated ones, clearly demonstrating the
corrosion protecting capability of EB coats in salt environments. The corrosion
current was roughly five times less for the trimer coated coupons compared to the
non-coated ones, also demonstrating an anti-corrosion effect.
Identical potentiodynamic studies were carried out for A12024-T3 samples
coated with EB, trimer and epoxy (Buehler Limited, epoxide resin #20-8130-032 and
epoxide hardener #20-8132-008) where a 0.2 cm scratch had been scribed into the
films exposing the bare A12024-T3 metal to the electrolyte. Potentiodynamic
experiments carried out in a deaerated 0.1M NaCl solution gave evidence that the EB
and trimer films have throwing power, i.e., the ability to protect a metal against
corrosion even for areas where the metal is exposed (cracks in the coating, etc). In
Fig. 8 are shown the potentiodynamic scans for scribed EB and epoxy, and the
corrosion current was reduced by more than a factor of ten for the EB coated samples
as compared to the epoxy coated coupons. The same anti-corrosion effect was found
for the scribed trimer coatings, as depicted in Fig. 9, where the corrosion current for
the trimer samples was reduced by an order of magnitude compared to the epoxy- coated coupons.
Summary
There is evidence that EB and derivatives thereof spun/cast as films/coats
reduce the corrosion damage of aluminum and aluminum alloys when exposed to, or
resident in, corrosive environments.
Sulfonated (50% - 100%) polyanilines (SPAN), depicted in Figure 2,
oligomers of EB and SPAN (trimers, tetramers, octamers, hexdecamers, etc.), as well
as ring-modified derivatives of EB, SPAN and their oligomers are expected to offer
similar corrosion protection given their electronic and chemical similarities to EB.
The potentiodynamic studies also indicated that the coatings in accordance
with the present invention are capable of achieving throwing power levels such that
the coatings are capable of providing an anti-corrosive effect even when there are
exposed gaps in the coating.
In view of the foregoing disclosure, it will be within the ability of one skilled in
the art to make alterations and variations to the present invention, such as through the
substitution of equivalent materials and processing steps, without departing from the
spirit of the invention as reflected in the following claims, the substance of which is
included herein.
Claims
What is claimed is:
1. A coating composition for protecting aluminum and alloys thereof from
corrosion, said composition comprising at least one substance selected from the group
consisting of emeraldine base polyaniline and oligomers thereof.
2. A coating composition according to claim 1 wherein said at least one
substance is an oligomer of emeraldine base polyaniline selected from the group
consisting of trimers, tetramers, octamers, hexadecamers, and mixtures thereof.
3. A coating composition according to claim 1 additionally comprising a resin.
4. A coating composition according to claim 3 wherein said resin is selected from
the group consisting of acrylic and epoxy resins.
5. A coating composition according to claim 1 wherein said at least one
substance is provided with additional ring substituents.
6. A coating composition according to claim 5 wherein said ring substituents are
selected from the group consisting of carbonate groups, alkyl groups, alkoxy groups,
and combinations thereof.
7. A coated metal piece, said coated metal piece comprising:
(a) a metal piece comprising a metal selected from the group consisting of
aluminum and alloys thereof, said metal having piece having at least one surface
adapted to receive a coating; and
(b) a coating on said at least one surface, said coating comprising at least one
substance selected from the group consisting of emeraldine base polyaniline and
oligomers thereof.
8. A coated metal piece according to claim 7 wherein said at least one substance
is an oligomer of emeraldine base polyaniline selected from the group consisting of
trimers. tetramers. octamers, hexadecamers, and mixtures thereof.
9. A coated metal piece according to claim 7 additionally comprising a coating
sealant atop said coating.
10. A coated metal piece according to claim 9 wherein said sealant is selected
from the group consisting of lacquers and epoxy sealants.
11. A coated metal piece according to claim 7 wherein said at least one substance
is provided with additional ring substituents.
12. A coated metal piece according to claim 11 wherein said ring substituents are
selected from the group consisting of carbonate groups, alkyl groups, alkoxy groups,
and combinations thereof.
13. A coating composition for protecting aluminum and alloys thereof from
corrosion, said composition comprising at least one substance selected from the group
consisting of sulfonated polyaniline and salts and oligomers thereof.
14. A coating composition according to claim 13 wherein said at least one
substance is an oligomer of sulfonated polyaniline selected from the group consisting
of trimers, tetramers, octamers, hexadecamers, and mixtures thereof.
15. A coating composition according to claim 13 additionally comprising a resin.
16. A coating composition according to claim 15 wherein said resin is selected
from the group consisting of acrylic and epoxy resins.
17. A coating composition according to claim 1 wherein the degree of
sulfonation of said at least one substance is in the range of from about 50% to about
100%.
18. A coating composition according to claim 13 wherein said at least one
substance is provided with additional ring substituents.
19. A coating composition according to claim 18 wherein said ring substituents
are selected from the group consisting of carbonate groups, alkyl groups, alkoxy
groups, and combinations thereof.
20. A coated metal piece, said coated metal piece comprising:
(a) a metal piece comprising a metal selected from the group consisting of
aluminum and alloys thereof, said metal having piece having at least one surface
adapted to receive a coating; and
(b) a coating on said at least one surface, said coating comprising at least one
substance selected from the group consisting of sulfonated polyaniline and salts and
oligomers thereof.
21. A coated metal piece according to claim 20 wherein said at least one substance
is an oligomer of sulfonated polyaniline selected from the group consisting of trimers,
tetramers, octamers, hexadecamers, and mixtures thereof.
22. A coated metal piece according to claim 20 additionally comprising a coating
sealant atop said coating.
23. A coated metal piece according to claim 22 wherein said sealant is selected
from the group consisting of lacquers and epoxy sealants.
24. A coated metal piece according to claim 20 wherein the degree of sulfonation
of said at least one substance is in the range of from about 50% to about 100%.
25. A coated metal piece according to claim 20 wherein said at least one substance
is provided with additional ring substituents.
26. A coated metal piece according to claim 25 wherein said ring substituents are
selected from the group consisting of carbonate groups, alkyl groups, alkoxy groups,
and combinations thereof.
27. A coated metal piece according to claim 20 wherein said metal is selected from
the group consisting of A13003 and A12024-T3.
28. A process of providing a coating on a metal piece comprising aluminum and
alloys thereof, said process comprising the steps:
(a) obtaining a metal piece comprising a metal selected from the group
consisting of aluminum and alloys thereof, said metal having piece having at least one
surface adapted to receive a coating;
(b) polishing said at least one surface so as to remove any oxidation formed
thereupon; and
(c) placing a coating on said at least one surface, said coating comprising at
least one substance selected from the group consisting of emeraldine base polyaniline
and oligomers thereof.
29. A process according to claim 28 wherein said at least one substance is an
oligomer of emeraldine base polyaniline selected from the group consisting of trimers,
tetramers, octamers, hexadecamers, and mixtures thereof.
30. A process according to claim 28 additionally comprising placing a coating
sealant atop said coating.
31. A process according to claim 30 wherein said sealant is selected from the
group consisting of lacquers and epoxy sealants.
32. A process according to claim 28 wherein said at least one substance is
provided with additional ring substituents.
33. A process according to claim 28 wherein said ring substituents are selected
from the group consisting of carbonate groups, alkyl groups, alkoxy groups, and
combinations thereof.
34. A process of providing a coating on a metal piece comprising aluminum and
alloys thereof, said process comprising the steps:
(a) obtaining a metal piece comprising a metal selected from the group
consisting of aluminum and alloys thereof, said metal having piece having at least one
surface adapted to receive a coating;
(b) polishing said at least one surface so as to remove any oxidation formed
thereupon; and
(c) placing a coating on said at least one surface, said coating comprising at
least one substance selected from the group consisting of sulfonated polyaniline and
oligomers thereof.
35. A process according to claim 34 wherein said at least one substance is an
oligomer of sulfonated polyaniline selected from the group consisting of trimers,
tetramers, octamers, hexadecamers, and mixtures thereof.
36. A process according to claim 34 wherein said at least one substance
additionally comprises a resin.
37. A process according to claim 36 wherein said resin is selected from the group
consisting of acrylic and epoxy resins.
38. A process according to claim 34 wherein the degree of sulfonation of said at
least one substance is in the range of from about 50% to about 100%.
39. A process according to claim 34 wherein said at least one substance is
provided with additional ring substituents.
40. A process according to claim 39 wherein said ring substituents are selected
from the group consisting of carbonate groups, alkyl groups, alkoxy groups, and
combinations thereof.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3668597P | 1997-03-11 | 1997-03-11 | |
| US36685P | 1997-03-11 | ||
| PCT/US1998/004832 WO1998040881A1 (en) | 1997-03-11 | 1998-03-11 | Corrosion protection of aluminum and aluminum alloys using emeraldine base polyaniline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0966737A1 EP0966737A1 (en) | 1999-12-29 |
| EP0966737A4 true EP0966737A4 (en) | 2000-04-19 |
Family
ID=21890053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98910331A Withdrawn EP0966737A4 (en) | 1997-03-11 | 1998-03-11 | Corrosion protection of aluminum and aluminum alloys using emeraldine base polyaniline |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0966737A4 (en) |
| JP (1) | JP2000512344A (en) |
| AU (1) | AU6459598A (en) |
| CA (1) | CA2283926A1 (en) |
| WO (1) | WO1998040881A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6326441B1 (en) | 2000-01-18 | 2001-12-04 | Council Of Scientific And Industrial Research | Compensated sulphonated polyaniline and a process for the preparation thereof |
| CN100358964C (en) * | 2004-12-08 | 2008-01-02 | 吉林正基科技开发有限责任公司 | Polyaniline corrosion proof sealant |
| US8691028B2 (en) * | 2006-05-10 | 2014-04-08 | The Boeing Company | Article having a hexavalent-chromium-free, corrosion-inhibiting organic conversion coating thereon, and its preparation |
| JP4640399B2 (en) * | 2007-09-25 | 2011-03-02 | トヨタ自動車株式会社 | Rust-proof metal substrate and rust prevention method on metal substrate surface |
| CN101381578B (en) * | 2008-10-17 | 2011-08-03 | 哈尔滨工程大学 | Super-light Mg-Li alloy high-efficiency anticorrosive paint |
| WO2013188496A2 (en) * | 2012-06-12 | 2013-12-19 | Cbi Polymers, Inc. | Corrosion resistant additive compositions and coating compositions employing the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993014166A1 (en) * | 1992-01-21 | 1993-07-22 | Allied-Signal Inc. | Conjugated polymer paint formulations which provide corrosion resistance to metal surfaces |
| US5441772A (en) * | 1993-09-29 | 1995-08-15 | Air Products And Chemicals, Inc. | Protecting carbon steel from corrosion with nonconducting poly(aniline) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5208301A (en) * | 1988-05-13 | 1993-05-04 | Ohio State University Research Foundation | Sulfonated polyaniline compositions, ammonium salts thereof, process for their preparation and uses thereof |
| US5137991A (en) * | 1988-05-13 | 1992-08-11 | The Ohio State University Research Foundation | Polyaniline compositions, processes for their preparation and uses thereof |
-
1998
- 1998-03-11 JP JP10539791A patent/JP2000512344A/en active Pending
- 1998-03-11 WO PCT/US1998/004832 patent/WO1998040881A1/en not_active Application Discontinuation
- 1998-03-11 EP EP98910331A patent/EP0966737A4/en not_active Withdrawn
- 1998-03-11 CA CA002283926A patent/CA2283926A1/en not_active Abandoned
- 1998-03-11 AU AU64595/98A patent/AU6459598A/en not_active Abandoned
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993014166A1 (en) * | 1992-01-21 | 1993-07-22 | Allied-Signal Inc. | Conjugated polymer paint formulations which provide corrosion resistance to metal surfaces |
| US5441772A (en) * | 1993-09-29 | 1995-08-15 | Air Products And Chemicals, Inc. | Protecting carbon steel from corrosion with nonconducting poly(aniline) |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO9840881A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000512344A (en) | 2000-09-19 |
| AU6459598A (en) | 1998-09-29 |
| EP0966737A1 (en) | 1999-12-29 |
| CA2283926A1 (en) | 1998-09-17 |
| WO1998040881A1 (en) | 1998-09-17 |
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