Chemistry: electrical and wave energy – Processes and products
Patent
1983-06-27
1985-01-29
Tung, T.
Chemistry: electrical and wave energy
Processes and products
204400, G01N 2746
Patent
active
044964323
ABSTRACT:
A method of producing a high color contrast between nickel and/or copper or their various alloys and a noble metal or noble metal alloy such as in electrical contacts having a nickel or copper base with an overlay of a noble metal or a noble metal alloy bonded to the surface of the base. By making the contact one electrode in an aqueous solution of a readily soluable ionizable solute and impressing a low AC voltage across the solution, a reaction occurs which makes the base of the electrical contact easily visually distinguishable from the metal overlay.
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Chang "Junction Delineation by Anodic Oxidation in InSb (As, P)", Solid State Electronics, vol. 10, pp. 539-544 (1966).
AT&T - Technologies, Inc.
Kip, Jr. R. F.
Tung T.
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