Metal treatment
First Claim
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1. A process for increasing the corrosion resistance of a metal object bearing a pre-existing protective conversion coating, said process comprising steps of:
- (A) contacting the pre-existing coating with a composition having a pH from about 5 to about 12 and consisting essentially of;
(1) water,(2) from 25-5000 ppm of triazole molecules selected from the group consisting of aryl triazoles containing from 6 to about 10 carbon atoms and alkyl triazoles containing from 1 to about 6 carbon atoms, and, optionally,(3) at least partially substituted poly(vinylphenol) polymer or copolymer including substituents on at least some of the phenol rings that have a chemical structure according to one of the formulas;
##STR6## wherein each of R5 through R12 is selected from hydrogen, an alkyl, an aryl, an aryl, a hydroxy-alkyl, an amino-alkyl, a mercapto-alkyl, or a phospho-alkyl moiety, except that R12 can also be --O.sup.(-1) or --OH and that at least one of R9 and R10 must include a polyhydroxy functionality resulting from the condensation of an amine or ammonia with a ketose, aldose, or other polyhydroxyl compound having from about 3 to about 8 carbon atoms, followed by reduction from imino to amino, and, optionally,(4) polar organic solvents; and
(B) drying the object completion of step (A).
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Abstract
Seal coating compositions and method of applying same, to metallic surfaces, particularly aluminum or alloys thereof, containing a previously formed protective coating on the metal surface, to provide for improved corrosion resistance beyond that provided by the previously formed protective coating. Aqueous solutions of the seal coating components are applied to the metal surface containing the previously formed coating which is subsequently rinsed and dried to provide metal articles having improved resistance to corrosion.
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Citations
24 Claims
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1. A process for increasing the corrosion resistance of a metal object bearing a pre-existing protective conversion coating, said process comprising steps of:
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(A) contacting the pre-existing coating with a composition having a pH from about 5 to about 12 and consisting essentially of; (1) water, (2) from 25-5000 ppm of triazole molecules selected from the group consisting of aryl triazoles containing from 6 to about 10 carbon atoms and alkyl triazoles containing from 1 to about 6 carbon atoms, and, optionally, (3) at least partially substituted poly(vinylphenol) polymer or copolymer including substituents on at least some of the phenol rings that have a chemical structure according to one of the formulas;
##STR6## wherein each of R5 through R12 is selected from hydrogen, an alkyl, an aryl, an aryl, a hydroxy-alkyl, an amino-alkyl, a mercapto-alkyl, or a phospho-alkyl moiety, except that R12 can also be --O.sup.(-1) or --OH and that at least one of R9 and R10 must include a polyhydroxy functionality resulting from the condensation of an amine or ammonia with a ketose, aldose, or other polyhydroxyl compound having from about 3 to about 8 carbon atoms, followed by reduction from imino to amino, and, optionally,(4) polar organic solvents; and (B) drying the object completion of step (A). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification
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Current AssigneeHenkel Corporation (Henkel AG & Co KGaA)
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Original AssigneeHenkel Corporation (Henkel AG & Co KGaA)
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InventorsCarlson, Lawrence R., Johnson, Philip M., Pierce, John R.
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Primary Examiner(s)Silverberg, Sam
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Application NumberUS07/685,355Time in Patent Office820 DaysField of Search106/14.15, 106/14.16, 148/256, 148/274, 148/265, 148/257, 148/275, 148/272, 204/220US Class Current148/257CPC Class CodesC23C 22/83 Chemical after-treatmentC25D 11/246 for sealing layers
