| 摘要 |
PURPOSE:To improve the productivity of plating as well as to make the use of a pollutive substance unnecessary by forming vacuum-deposited layers of Zn and Ni on the surface of a base material and alloying the metals by heating at a specified temp. CONSTITUTION:The surface of a base material such as a cold rolled steel sheet is activated by reduction in an H2 atmosphere at a prescribed temp. The activated surface is coated with Zn and Ni in layers by vacuum deposition, and the metals are alloyed by diffusion or melting in an atmosphere of a nonoxidizing gas at 300-500 deg.C to plate the surface of the steel sheet with a Zn-Ni alloy. Thus, a Zn-Ni alloy film having corrosion resistance comparable to that of a Zn-Ni alloy film formed by conventional electroplating is formed with high energy efficiency without requiring a pollutive electrolytic bath.
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