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Title: Protective conversion coating on mixed-metal substrates and methods thereof

Patent ·
OSTI ID:1321862
;

Mixed-metal automotive vehicle bodies-in-white comprising ferrous metal surfaces, zinc surfaces, aluminum alloy surfaces, and magnesium alloy surfaces are cleaned and immersed in an aqueous bath comprising an adhesion promoter and an aqueous electrocoat bath (the adhesion promoter may be in the electrocoat bath. The adhesion promoter, which may be a cerium salt, is selected to react with each metal in the body surfaces to form an oxide layer that provides corrosion resistance for the surface and adherence for the deposited polymeric paint coating. The body is cathodic in the electrocoat deposition.

Research Organization:
The Curators Of The University Of Missouri, Columbia, MO (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
EE0003583
Assignee:
The Curators Of The University Of Missouri (Columbia, MO)
Patent Number(s):
9,435,039
Application Number:
13/450,667
OSTI ID:
1321862
Resource Relation:
Patent File Date: 2012 Apr 19
Country of Publication:
United States
Language:
English

References (9)

Process for coating phosphated metal substrates patent June 1998
Process for applying a lead-free coating to untreated metal substrates via electrodeposition patent January 2001
Coated metal substrates and methods for preparing and inhibiting corrosion of the same patent November 2001
Process and solution for providing a conversion coating on a metallic surface I patent August 2004
Additive-assisted cerium-based electrolytic coating process for corrosion protection of aluminum alloys patent November 2004
Additive-assisted, cerium-based, corrosion-resistant e-coating patent July 2007
Coating line and process for forming a multilayer composite coating on a substrate patent May 2009
Process for forming a well visible non-chromate conversion coating for magnesium and magnesium alloys patent April 2010
Method for forming surface-treating film patent March 2011

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36 MATERIALS SCIENCE