US 4,400,248 AGranted

Electrolytic stripping process

AssigneeOccidental Chemical Corporation

InventorLillie C. Tomaszewski

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Abstract

A process and solution for electrolytically stripping metal deposits, particularly nickel and nickel-iron alloy deposits from a copper or copper alloy basis metal such as brass, for example, in which the aqueous stripping solution contains controlled effective amounts of halide salts, an organic carboxy acid, metal salts and mixtures thereof and hydrogen ions to provide a pH of less than about 5. The stripping of the metal deposit from the basis metal is effected by immersing the object in the stripping bath while anodically charged and passing electric current through the bath between the cathode and the object for a period of time sufficient to achieve the desired magnitude of stripping of the metal deposit.

Claims14

Dependent claims

A process for electrolytically stripping nickel and nickel-iron alloy deposits from copper and copper alloy basis metals which comprises the steps of immersing an object to be stripped in a stripping bath comprising an aqueous acidic solution consisting of about 5 to about 200 g/l halide salt, about 10 to about 100 g/l of a bath soluble organic carboxy acid, salt and mixtures thereof of the structural formula:

##STR3## Wherein:
R is H or an alkyl group containing 1 to 4 carbon atoms,
Y is H or OH,
X is H, a Group IA, IIA metal and NH.sub.4,
n is 0, 1 or 2;
and hydrogen ions to provide a pH less than about 5, controlling the temperature of said bath between room temperature up to about 180.degree. F., anodically charging the object and passing electric current through the solution between a cathode and the object for a period of time to achieve the desired magnitude of stripping of the metal deposit from the object.

3 more elements

Dependencies are inferred from the claim text.