| 发明名称 |
Spark plug and metal shell for spark plug |
| 摘要 |
An adhesion of a nickel plating layer to a metal shell is improved, and an effect of improving a corrosion resistance by providing the nickel plating layer is sufficiently exerted. A spark plug 1 includes a cylindrical metal shell 3 that extends in an axial CL1 direction, and a nickel plating layer 31 that is made of metal containing nickel as a main component and covers an outer surface of the metal shell. In a monochrome image of 256 gradations where black is 0 and white is 255, which is obtained by observing a cross-section perpendicular to an outer surface of the nickel plating layer by a transmission electron microscope with an acceleration voltage of 200 kV, an average value in 256 gradations of the monochrome image is 170 or larger and 230 or smaller. |
| 申请公布号 |
US8742653(B2) |
申请公布日期 |
2014.06.03 |
| 申请号 |
US201113822052 |
申请日期 |
2011.08.08 |
| 申请人 |
NGK Spark Plug Co., Ltd. |
发明人 |
Kodama Kazuhiro;Nasu Hiroaki |
| 分类号 |
H01T13/00;H01T13/20 |
主分类号 |
H01T13/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A spark plug comprising:
a cylindrical metal shell that extends in an axial direction; and a nickel plating layer that is made of metal containing nickel as a main component and covers an outer surface of the metal shell, wherein in a monochrome image of 256 gradations where black is 0 and white is 255, which is obtained by observing a cross-section perpendicular to an outer surface of the nickel plating layer by a transmission electron microscope with an acceleration voltage of 200 kV, an average value in the 256 gradations of the monochrome image is 170 or larger and 230 or smaller.
|
| 地址 |
Aichi JP |
