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Patent Searching and Data


Title:
SPARK PLUG AND MAIN FITTING FOR SPARK PLUG
Document Type and Number:
WIPO Patent Application WO/2012/035701
Kind Code:
A1
Abstract:
The adhesiveness of a nickel-plated layer to a main fitting is improved, and a corrosion resistance improvement effect is sufficiently demonstrated as a result of providing the nickel-plated layer. A spark plug (1) is provided with a main cylindrical fitting (3) that extends in the axis line (CL1) direction, and a nickel-plated layer (31) that comprises metals consisting primarily of nickel, and that covers the outer surface of the main fitting (3). In a grayscale image with 256 gradations, in which, when a cross-section that intersects with the outer surface of the nickel-plated layer (31) is observed by transmission electron microscope according to a 200 kV accelerating voltage, black is considered to be 0 and white is considered to be 255, the average value of the 256 gradations of the grayscale image is from 170 to 230.

Inventors:
KODAMA KAZUHIRO (JP)
NASU HIROAKI (JP)
Application Number:
PCT/JP2011/004492
Publication Date:
March 22, 2012
Filing Date:
August 08, 2011
Export Citation:
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Assignee:
NGK SPARK PLUG CO (JP)
KODAMA KAZUHIRO (JP)
NASU HIROAKI (JP)
International Classes:
C25D7/00; H01T13/20
Foreign References:
JP2003257584A2003-09-12
JP2002184552A2002-06-28
JP2002184552A2002-06-28
JP2006236906A2006-09-07
Other References:
See also references of EP 2618435A4
Attorney, Agent or Firm:
AOKI, Noboru et al. (JP)
Aoki 昇 (JP)
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Claims: