Composition and process for the treatment of metal surfaces
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United States of America Patent
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N/A
Issued Date -
Sep 18, 2003
app pub date -
Mar 14, 2002
filing date -
Mar 14, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of forming a conversion layer on a metallic surface and a composition usable in the method are provided. The composition is an aqueous solution comprising a source of tungstate ions and a soluble material comprising zirconium. The method provides a conversion coating on a surface that can then be painted or otherwise treated. The conversion coatings of the present invention are minimally affected by heating and/or baking, unlike chromate conversion coatings of the prior art.
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