Composition and processes of a dry-in-place trivalent chromium corrosion-resistant coating for use on metal surfaces
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United States of America Patent
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Jan 10, 2012
Grant Date -
Aug 16, 2007
app pub date -
Feb 13, 2007
filing date -
Feb 14, 2006
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Abstract
Corrosion resistant coatings are formed on aluminum by contacting with aqueous solutions containing trivalent chromium ions and fluorometallate ions, the solutions being substantially free of hexavalent chromium. Trivalent chromium films formed on the aluminum surface when tested in 5% NaCl salt spray chamber showed corrosion resistance in excess of 168 hours. Trivalent chromium coated aluminum also serves as an effective base for paint primers.
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