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Spark plug

一种火花塞、镀镍层的技术，应用在火花塞领域，能够解决不是很充分等问题，达到不均匀性小、抑制耐腐蚀性的降低、耐腐蚀性提高的效果

Active Publication Date: 2013-08-14
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, in fact, there is not enough research on improving the corrosion resistance of spark plugs by making the thickness of the electroplating layer uniform and suppressing the peeling of the electroplating layer.

Method used

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Experimental program
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Embodiment

[0106] Figure 6 It is an explanatory diagram showing a table summarizing the measured values ​​of the atomic concentration of carbon atoms in the nickel plating layer and the evaluation results of corrosion resistance for five types of samples S01 to S05 of the metallic shell 1 manufactured under the following conditions. In addition, in Figure 6 In the table of , the types and amounts of brighteners added to the plating solution are shown in order to change the atomic concentration of carbon atoms in the nickel plating layers of the samples S01 to S05.

[0107] Samples S01 to S02 of the metallic shell 1 were produced by welding the ground electrode 4 to a main body produced by cold forging using a carbon steel wire SWCH17K for cold forming specified in JISG3507 as a material. About each sample S01-S05, after performing degreasing and water washing, the impact nickel plating process using the rotating barrel was performed on the following process conditions.

[0108]

[...

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PUM

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Abstract

To provide a technology of improving the corrosion resistance of a spark plug. A spark plug 100 includes a metal shell 1 on the outer surface of which a nickel plated layer is formed as a protective surface film. The nickel plated layer is such that when the atomic concentrations of constituent elements are measured in a depth direction by an X-ray photoelectron spectroscopy (XPS), the concentration of carbon atoms is 1.0% or more and 10.0% or less at a depth at which the atomic concentration of Ni elements is 80%.

Description

technical field [0001] The present invention relates to spark plugs. Background technique [0002] A spark plug used for ignition of an internal combustion engine such as a gasoline engine has a shaft-shaped center electrode, a cylindrical insulator holding the center electrode inside, and a metal shell holding the insulator inside. A substantially L-shaped ground electrode is provided on the metallic shell so that a spark discharge gap is formed between the metallic shell and the center electrode. The metal shell and the ground electrode are generally made of iron-based materials such as carbon steel, and their outer surfaces are plated for corrosion protection (Patent Document 1 below). [0003] However, the metal shell has portions where current does not easily flow in the plating tank, such as the inner wall surface of the cylinder hole holding the insulator, and the recessed portion of the outer surface, and the thickness of the formed plating layer may be uneven. If ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/02
CPCH01T13/39H01T13/06H01T13/32H01T13/20
Inventor 儿玉和宏那须弘哲
Owner NGK SPARK PLUG CO LTD