YAGレ-ザ照射によるZn/Ni2層めっき皮膜表層合金化の最適条件

概要

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A new method has been developed in which Zn/Ni double-coated films were electroplated onto steel substrates, and then irradiated, using a high powered YAG laser with kaleidoscope in lieu of a CO2 laser for surface modification to alloy the Zn/Ni films.The effects of film thickness and laser treatment conditions on the alloying of the Zn/Ni double-coated film were also investigated by EPMA and X-ray diffraction analysis.EPMA line analysis revealed that with laser irradiation under optimum conditions, a double-coated Zn/Ni film consisting of an overlying Zn film having an average thickness of 10μm and an underlying Ni film having an average thickness of 1.3μm formed a Zn-Ni alloy film in which Zn and Ni were uniformly distributed. X-ray diffraction analysis showed that the Zn-Ni alloy film was mainly composed of the Ni5Zn21 (γ-phase) structure.