Process for removing a chromium passivation film from an...

Details Process for removing a chromium passivation film from an... Process for removing a chromium passivation film from an...

C - Chemistry, Metallurgy

23

G

C23G 1/14 (2006.01) C23G 1/12 (2006.01) C23G 1/22 (2006.01)

Patent

CA 2070852

-20- ABSTRACT Processes for chemically modifying without abrasive treatment a chromium passivation film from a passivated aluminum-zinc coated steel surface. The cleaner compositions employ at least one chelant, at least one surfactant and an alkaline source compound in an aqueous solution. The processes employ spraying the cleaner composition onto the passivated steel.

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