Method for creating a corrosion-resistant surface on aluminum alloys having a high copper content

Mansfeld, Florian B.; Wang, You; Lin, Simon H.

Title: Method for creating a corrosion-resistant surface on aluminum alloys having a high copper content

Patent · Tue Dec 10 00:00:00 EST 1996

OSTI ID:1531421

Mansfeld, Florian B.; Wang, You; Lin, Simon H.

A method for treating the surface of aluminum alloys having a relatively high copper content is provided which includes the steps of removing substantially all of the copper from the surface, contacting the surface with a first solution containing cerium, electrically charging the surface while contacting the surface in an aqueous molybdate solution, and contacting the surface with a second solution containing cerium. The copper is substantially removed from the surface in the first step either by (i) contacting the surface with an acidic chromate solution or by (ii) contacting the surface with an acidic nitrate solution while subjecting the surface to an electric potential. The corrosion-resistant surface resulting from the invention is excellent, consistent and uniform throughout the surface. Surfaces treated by the invention may often be certified for use in salt-water services.

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Research Organization:: Univ. of Southern California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: N00014-91-J-1041

Assignee:: University of Southern California (Los Angeles, CA)

Patent Number(s):: 5,582,654

Application Number:: 08/247,147

OSTI ID:: 1531421

Resource Relation:: Patent File Date: 1994-05-20

Country of Publication:: United States

Language:: English

References (16)

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Compound, non-chromium conversion coatings for aluminum alloys Jaworowski, Mark R.; Kryzman, Michael A. https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6613390 US Patent Document 6,613,390	patent	September 2003
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Non-toxic corrosion-protection rinses and seals based on rare earth elements Phelps, Andrew Wells; Sturgill, Jeffrey Allen; Swartzbaugh, Joseph Thomas https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/7422793 US Patent Document 7,422,793	patent	September 2008

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