Selective etching of nickle/iron alloys

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

1997-10-03

1999-11-23

Dang, Thi

Etching a substrate: processes

Forming or treating electrical conductor article

216108, C23F 100, H05K 300

Patent

active

059894431

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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