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US 7,732,068 B2Granted
Corrosion resistant aluminum alloy substrates and methods of producing the same
AssigneeAlcoa Inc.
InventorsThomas L. Levendusky, Luis Fanor Vega, Albert Askin, Joseph D. Guthrie, Kevin M. Robare, Clinton Zediak
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Abstract
Aluminum alloy products comprising an aluminum alloy base and a sulfate-phosphate oxide zone integral therewith are disclosed. Methods of making the same are also disclosed.
Claims15
An aluminum alloy product comprising:
- (A) an aluminum alloy base having an electrochemically formed porous sulfate-phosphate oxide zone, the porous sulfate-phosphate oxide zone having a plurality of pores;
- (i) wherein the ratio of sulfur atoms to phosphorous atoms in the porous sulfate-phosphate oxide zone is from about 5:1 to about 100:1;
- and
- (ii) wherein the porous sulfate-phosphate oxide zone has a thickness of at least about 5 microns;
- and
- (B) a silicon-containing polymer zone coupled to the electrochemically formed porous sulfate-phosphate oxide zone;
- (i) wherein the silicon-containing polymer zone comprises a coating portion on a surface of the aluminum alloy base;
- and
- (ii) wherein the silicon-containing polymer zone comprises a silicon polymer having a backbone of the formula —Si—X—Si—, wherein X is either N or O;
- and
- (iii) wherein at least some of the silicon polymer is contained within at least some of the pores of the porous sulfate-phosphate oxide zone.
8 more elements
Dependencies are inferred from the claim text.