Selective etching of nickle/iron alloys

Details Selective etching of nickle/iron alloys Selective etching of nickle/iron alloys

1996-05-28

1998-03-03

Dang, Thi

Compositions

Etching or brightening compositions

Inorganic acid containing

C09K 1300

Patent

active

057230625

ABSTRACT:
The present invention provides a novel method of etching nickle/iron alloy which employs a novel etchant. The novel etchant, which etches nickle/iron alloy but not copper, comprises an aqueous solution of ferric ammonium sulfate, and an acid selected from the group consisting of: sulfuric acid; phosphoric acid; and mixtures thereof.

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patent: 4522667 (1985-06-01), Hanson et al.
patent: 4556449 (1985-12-01), Nelson
patent: 5234542 (1993-08-01), Cordani

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