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

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

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

Abstract

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.

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

Issue Date:: 1996-12-10

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

Sponsoring Org.:: USDOE

OSTI Identifier:: 1531421

Patent Number(s):: 5582654

Application Number:: 08/247,147

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

Patent Classifications (CPCs):: C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23C - COATING METALLIC MATERIAL

C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23F - NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE

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C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23C - COATING METALLIC MATERIAL
C23C22/68 - using aqueous solutions with pH between 6 and 8
C23C22/78 - Pretreatment of the material to be coated

C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23F - NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE
C23F1/00 - Etching metallic material by chemical means

C - CHEMISTRY C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES C25D - PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS
C25D11/06 - characterised by the electrolytes used

C - CHEMISTRY C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES C25F - PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS
C25F3/04 - of light metals
C25F3/06 - of iron or steel

Show less

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

Resource Type:: Patent

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

Country of Publication:: United States

Language:: English

Citation Formats


                    Mansfeld, Florian B., Wang, You, and Lin, Simon H. Method for creating a corrosion-resistant surface on aluminum alloys having a high copper content.  United States: N. p., 1996. 
        Web.

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                    Mansfeld, Florian B., Wang, You, & Lin, Simon H. Method for creating a corrosion-resistant surface on aluminum alloys having a high copper content.  United States.

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                    Mansfeld, Florian B., Wang, You, and Lin, Simon H. Tue .  
        "Method for creating a corrosion-resistant surface on aluminum alloys having a high copper content".  United States.  https://www.osti.gov/servlets/purl/1531421.

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@article{osti_1531421,

  title        = {Method for creating a corrosion-resistant surface on aluminum alloys having a high copper content},

  author       = {Mansfeld, Florian B. and Wang, You and Lin, Simon H.},

  abstractNote = {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.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1996},

  month        = {12}

}

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patent, April 1973

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Surface treatment chemical and bath for aluminum and its alloy
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Bibber, John W.
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Mansfeld, F.; Lin, S.; Kim, S.
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Works referencing / citing this record:

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Similar Records

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

Abstract

Citation Formats

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Chrome-Free Deoxidizing and Desmutting Composition and Method
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Surface treatment chemical and bath for aluminum and its alloy
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Corrosion protection of high copper aluminium alloys by surface modification
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Method of inhibiting corrosion of zirconium or its alloy
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Rare earth coating process for aluminum alloys
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Chromium-free method and composition to protect aluminum
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Method for creating a corrosion-resistant aluminum surface
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Corrosion inhibition with rare earth metal salts
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Rare earth metal rinse for metal coatings
patent, July 1976

Surface modification of Al alloys and Al-based metal matrix composites by chemical passivation
journal, August 1989

Cationic-Film-Forming Inhibitors for the Protection of the AA 7075 Aluminum Alloy Against Corrosion in Aqueous Chloride Solution
journal, January 1989

Method of improving the corrosion resistance of chemical conversion coated aluminum
patent, May 1984

Treatment of Magnesium and Magnesium Base Alloys to Increase Their Resistance to Corrosion
patent, June 1950

Coating process for aluminum and aluminum alloy
patent, June 1976

Corrosion resistant aluminum coating composition
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Corrosion Protection of Al Alloys and Al-Based Metal Matrix Composites by Chemical Passivation
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Non-toxic corrosion-protection conversion coats based on cobalt
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Use of rare earth metal salt solutions for sealing or anodized aluminum for corosion protection and paint adhesion
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Corrosion resistant metallate compositions
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Electrolytic and electroless process for treating metallic surfaces and products formed thereby
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Apparatus and method for TV broadcast copy protection
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Compound, non-chromium conversion coatings for aluminum alloys
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