Aluminum alloy having a non-chromium protective coating

Details Aluminum alloy having a non-chromium protective coating Aluminum alloy having a non-chromium protective coating

C - Chemistry, Metallurgy

23

C

148/17, 148/23

C23C 22/66 (2006.01) C23C 22/20 (2006.01) C23C 22/56 (2006.01) C23C 22/83 (2006.01)

Patent

CA 1341156

An aluminum alloy having thereon a non-chromium protective coating wherein the essential ingredients are nitrate ions and alkali metal permanganate. Also, aluminum alloys which have a Cu content of greater than 1% by weight preferably have the coating applied in multiple steps. One sequence of steps is applying sodium permanganate between a nitrate coating and an alkali metal silicate coating. Another sequence of steps is to have first and third sodium permanganate coating compositions, a second phosphate coating composition and a fourth alkali metal silicate composition. My aluminum alloys do not contain any toxic chromium. I also provide a process of coating the aluminum alloys and a non-chromium phosphate coating composition for aluminum and aluminum alloys.

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