Selective etching of nickle/iron alloys

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

1994-12-19

1996-10-01

Dang, Thi

Etching a substrate: processes

Nongaseous phase etching of substrate

Etching inorganic substrate

252 792, C23F 100

Patent

active

055608400

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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