Treatment of metal surfaces with trivalent chromium solutions

Details Treatment of metal surfaces with trivalent chromium solutions Treatment of metal surfaces with trivalent chromium solutions

C - Chemistry, Metallurgy

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C

148/20

C23C 22/83 (2006.01) C23C 22/48 (2006.01) C23C 22/53 (2006.01)

Patent

CA 1046912

Title: TREATMENT OF METAL SURFACES WITH TRIVALENT CHROMIUM SOLUTIONS Inventor: Donald Edward Wells Abstract of the Disclosure: Conversion coatings are produced on ferrous metal or galvanized surfaces by treatment with an aqueous solu- tion of a trivalent chromium compound. The solution is preferably formed by the reduction of a hexavalent chromium solution with an alkali metal sulfite or bisulfite. The temperature of the metal treatment is substantially lower than is required to produce an iron phosphate coating, and the absence of hexavalent chromium results in a substantial decrease in pollutants in the effluent. The conversion coating obtained is usually deep blue in color and improves paint adhesion of the treated surface and corrosion resis- tance, especially under paint and other, siccative organic coatings.

228380

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