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    • 51. 发明申请
    • Spark plug
    • 火花塞
    • US20050127808A1
    • 2005-06-16
    • US11002443
    • 2004-12-03
    • Hirofumi SuzukiSeiji Amakusa
    • Hirofumi SuzukiSeiji Amakusa
    • C23C22/53C23C28/00H01T13/08H01T13/20F02M57/06F02P13/00H01T13/00
    • C23C28/3225C23C22/53C23C28/345C23C2222/10H01T13/08
    • 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.
    • 火花塞包括金属壳体,固定在金属壳体中的绝缘体,固定在绝缘体中的中心电极,经由火花放电间隙与中心电极相对的接地电极,以及形成在金属壳体的表面上的保护涂层 和垫圈。 保护层包括在金属壳体和垫圈的表面上形成的镀锌膜和依次层压在镀锌膜上的铬酸盐膜。 铬酸盐膜是六价铬,含有三价铬作为主要成分。 铬酸盐膜的膜厚不小于0.05μm,不大于0.18μm,并且铬酸盐膜含有与锌相比耐氧化的金属成分。 此外,铬酸盐膜在室温至180℃的温度范围内具有等于或小于1GPa的膜硬度。