Selected stripping of metals

Details Selected stripping of metals Selected stripping of metals

C - Chemistry, Metallurgy

23

F

149/15

C23F 1/02 (2006.01) C11D 7/32 (2006.01) C23F 1/44 (2006.01)

Patent

CA 1086613

Abstract of the Disclosure - A composition and process for selectively removing nickel and nickel alloys with iron and/or cobalt from a surface of a metal substrate which comprises contacting said metal surface with an aqueous bath containing: (a) at least one nitro substituted organic compound: (b) at least one organic amine or polyamine or substituted amine or polyamine; and (c) at least one phosphorus oxo acid or organic phosphorus oxo acid or salts thereof or alkyl phosphorus substituted amines. By nickel-iron alloy deposit is meant a deposit containing from about 5 to 90 percent by weight iron with that portion which is not iron being primarily nickel or nickel and cobalt. Although small amounts of impurities such as copper, zinc, cadmium, lead, etc. may also be present, the major constituents of the alloy are nickel and iron. - i -

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