Spark plug having heat- and corrosion-resistant surface

Details Spark plug having heat- and corrosion-resistant surface Spark plug having heat- and corrosion-resistant surface

1988-12-06

1990-10-30

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313 115, H01T 1306

Patent

active

049671162

ABSTRACT:
A metal body has a heat- and corrosion-resistant surface which is composed of a layer of nickel plating applied to a surface of a metal base and an electrolytic chromate film formed over the nickel plating. Preferably, the chromate film has a thickness of 3 .mu.m or less. The chromate film may have a color imparted upon its formation by an electrolytic chromate treatment. A metal sheel of a spark plug may be mentioned as one example of the metal body.

REFERENCES:
patent: 1164082 (1915-12-01), Gallant
patent: 3492156 (1970-01-01), Ayoub
patent: 3857145 (1974-12-01), Yamaguchi et al.
"Mekki Kyohon" (Textbook of Plating, Compiled by Electroplating Study Group), published Sep. 20, 1986, (excerpt) in Japanese with English translation.

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