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    • 1. 发明专利
    • Spark plug and main body metal fitting for the same
    • 火花塞和主体金属配件
    • JP2012064373A
    • 2012-03-29
    • JP2010206329
    • 2010-09-15
    • Ngk Spark Plug Co Ltd日本特殊陶業株式会社
    • KODAMA KAZUHIRONASU HIROTETSU
    • H01T13/20C25D7/00
    • H01T13/06C25D7/00C25D7/003H01T13/02H01T13/36
    • PROBLEM TO BE SOLVED: To improve the adhesion of a nickel plated layer to a main body metal fitting and fully exhibit the improvement effect of corrosion resistance by inclusion of the nickel plated layer.SOLUTION: A spark plug 1 comprises a cylindrical main body metal fitting 3 extending in an axis line CL1 direction and a nickel plated layer 31, made of a metal containing nickel as its main composition, which covers the outside surface of the main body metal fitting 3. In a monochrome gray image at 256 gray levels, where black corresponds to 0 and white corresponds to 255, of a cross section intersecting the outside surface of the nickel plated layer 31 at right angles, as observed by a transmission electron microscope using 200 kV acceleration voltage, the average value in 256 gray levels of the monochrome gray image is 170 to 230, both ends inclusive.
    • 要解决的问题:为了提高镍镀层对主体金属配件的粘附性,并通过包含镀镍层而充分显示耐腐蚀性的改善效果。 解决方案:火花塞1包括沿轴线CL1方向延伸的圆柱形主体金属配件3和由以镍为主要成分的金属制成的镀镍层31,其覆盖主体的外表面 身体金属配件3.在256灰度级的单色灰度图像中,其中黑色对应于0,白色对应于255,与镀镍层31的外表面成直角相交的横截面,如透射电子 显微镜使用200 kV加速电压,256灰度级别的单色灰度图像的平均值为170到230,包括两端。 版权所有(C)2012,JPO&INPIT