Spark plug

Details Spark plug Spark plug

2006-09-19

2006-09-19

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Spark plugs

C313S135000, C313S144000, C123S1690EB

Reexamination Certificate

active

07109645

ABSTRACT:
A spark plug includes a metallic housing, an insulator fixed in the metallic housing, a center electrode fixed in the insulator, a ground electrode opposed to the center electrode via a spark discharge gap, and a protective coat formed on the surfaces of a metallic housing and a gasket. The protective coat includes a galvanized film formed on the surfaces of the metallic housing and the gasket and a chromate film successively laminated on the galvanized film. The chromate film is hexavalent chromium-free and contains trivalent chromium as a major component. The chromate film has a film thickness not smaller than 0.05 μm and not greater than 0.18 μm, and the chromate film contains a metallic component which is robust against oxidation compared with zinc. Furthermore, the chromate film has a film hardness equal to or less than 1 GPa in the temperature range from a room temperature to 180° C.

REFERENCES:
patent: 6236148 (2001-05-01), Nasu et al.
patent: 2000-252042 (2000-09-01), None

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