Removal of "copper kiss" from pickling high copper alloys

Details Removal of "copper kiss" from pickling high copper alloys Removal of "copper kiss" from pickling high copper alloys

C - Chemistry, Metallurgy

23

F

C23F 1/16 (2006.01) C23F 1/18 (2006.01) C23F 1/44 (2006.01) C23G 1/02 (2006.01) C23G 1/10 (2006.01)

Patent

CA 2300492

When iron group, especially high nickel, metal alloys that contain substantial amounts of copper are pickled, a displacement coating of copper that is called a "copper kiss" often forms on the pickled surface from the dissolved copper ions in the pickling solution before the pickling solution can be rinsed away. Traditionally this has been removed by treatment with aqueous ammonia, an annoying and potentially hazardous reagent that in many instances requires expensive pollution abatement devices. In this invention, copper kiss is equally effectively removed by treatment with a mixture of sulfuric acid and hydrogen peroxide, optionally also containing hydrofluoric acid.

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