Nickel-gold plating exhibiting high resistance to corrosion

Details Nickel-gold plating exhibiting high resistance to corrosion Nickel-gold plating exhibiting high resistance to corrosion

2005-03-29

2005-03-29

Zimmerman, John J. (Department: 1775)

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

C428S680000, C428S929000, C439S886000

Reexamination Certificate

active

06872470

ABSTRACT:
A nickel-gold plating exhibiting high resistance to corrosion, which has a nickel plating layer formed on a base metal (1) and a gold plating layer (3) formed thereon, characterized in that the nickel plating layer (2) has a corrosion potential being brought close to that of the gold plating layer (3) through the reduction of the sulfur content of the nickel plating layer; or which has a first nickel plating layer (6) formed on a base metal, a second nickel plating layer (7) formed on the first nickel plating layer and a gold plating layer formed thereon, characterized in that the first nickel plating layer has a corrosion potential nobler (higher) than that of the second nickel plating layer. The nickel-gold plating exhibits only a mild local cell phenomenon between the gold plating layer and a nickel plating layer directly thereunder even under corrosive conditions, which leads to retardation of the corrosion through pitting and thus to a satisfactory durability of the plating with relatively thin respective plating layers. Accordingly, the nickel-gold plating achieves a high resistance to corrosion with little impairment of production cost or productivity.

REFERENCES:
patent: 4601958 (1986-07-01), Levine
patent: 4620661 (1986-11-01), Slatterly
patent: 4835067 (1989-05-01), Levine
patent: 4842961 (1989-06-01), Basile et al.
patent: 5051317 (1991-09-01), Solidum
patent: 9-176864 (1997-07-01), None
patent: 10-251860 (1998-09-01), None
patent: 2002-076189 (2002-03-01), None
patent: 2002-110838 (2002-04-01), None

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