| 摘要 |
PROBLEM TO BE SOLVED: To improve the corrosion resistance to acid such as hydrochloric acid or the like, moreover to reduce heat energy for corrosion resisting treatment and furthermore to reduce the operating time. SOLUTION: On the surface of a base material 12 in which a steel material such as SCM435 is formed on a link plate or the like, a nickel layer 13 is formed by nickel plating. Moreover, on the nickel layer, a Dacromet coating 15 is formed by Dacromet treatment. At this time, by mutual diffusion, nickel is diffused into the film, moreover, zinc or the like is diffused into the nickel layer, and they are mutually supplemented to improve its corrosion resistance.
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