| 摘要 |
PURPOSE:To improve wear resistance and seizing resistance while preventing the wear of a mating member by forming a layer of nickel-cobalt-phosphorus composite plating on the sliding surface of the piston of an internal combustion engine. CONSTITUTION:A composite plating layer 2 in which 5-30vol% hard particles with a particle diameter of less than 10mum are dispersed in an alloy base consisting of 10-40wt% cobalt, 2-10wt% phosphorus, and nickel the rest, is formed on the sliding surface of a metal piston 1. When the phosphorus contained in the alloy base is subjected to a thermosetting treatment, the hardness of the apply base is increased, while producing excellent effects in the improvement of wear resistance and corrosion resistance. Also, the addition of the cobalt improves the seizing resistance, corrosion resistance, and collapse fatigue strength of the alloy base.
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