ELECTRODE MATERIAL, ELECTRODE FOR IGNITION PLUG, AND IGNITION PLUG

PROBLEM TO BE SOLVED: To provide an electrode material which has superior anticorrosive properties and is suitable as a constituent material of an electrode for an ignition plug, and to provide an electrode for the ignition plug, and the ignition plug.SOLUTION: There is provided the electrode materi...

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Hauptverfasser:	YAMAZAKI KAZUO, TOKUDA TAKEYUKI, NISHIKAWA TAICHIRO, SAKUTA MASAO, OTA HAJIME
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL CORONA DEVICES DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRICITY GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY OVERVOLTAGE ARRESTERS USING SPARK GAPS SPARK GAPS SPARKING PLUGS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an electrode material which has superior anticorrosive properties and is suitable as a constituent material of an electrode for an ignition plug, and to provide an electrode for the ignition plug, and the ignition plug.SOLUTION: There is provided the electrode material which includes a base material made of nickel alloy and an oxide film formed at least on a part of a surface of the base material, and is used as a material of an electrode of an ignition plug of an internal combustion engine of an automobile etc. The oxide film has a double-layer structure of an inner oxide layer and a surface oxide layer and satisfies one of conditions (a) to (d). (a) The ratio of the thickness of the surface oxide layer to the thickness of the inner oxide layer is 67% or more and less than 160%. (b) The thickness of the surface oxide layer is 4 μm or more and less than 56 μm. (c) The thickness of the inner oxide layer is 5 μm or more and less than 33 μm. (d) The total thickness of the surface oxide layer and inner oxide layer is 9 μm or more and less than 91 μm. The electrode material includes the specific oxide film and thereby hardly corrodes against a corrosive liquid to have superior anticorrosive properties.