γ相Zn-Ni合金镀层结构及性能分析-《电镀与精饰》

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Title:: Structure and Performance Analysis of Zn-Ni Alloy Coating with γ phase

摘要:: 采用电沉积方法从碱性镀液中制备γ相Zn-Ni合金镀层,应用扫描电子显微镜、X-射线衍射仪、电化学测量技术对Zn-Ni合金镀层的微观结构和耐蚀性能进行了研究。结果表明,Ni-Zn合金镀层的腐蚀性与其微结构密切相关。Zn-Ni合金镀层的晶型为γ相,合金镀层中镍和锌的质量分数分别为15.98%和84.02%;锌-镍合金镀层中原子堆积方式为正四面体形。在5%氯化钠溶液中,γ相Zn-Ni合金镀层与锌镀层的电化学测试结果表明,在0-10Hz低频率区,γ-相Zn-Ni合金镀层的交流阻抗谱的实部值为镀锌层的7.2倍;腐蚀电位比锌层增加了0.1279V,镀锌层的Jcorr是γ相Zn-Ni合金镀层的5.78倍。

Abstract:: Zn-Ni alloy coating with γ phase was prepared by electrodeposition in alkaline electrolyte. Scanning electron microscopy,X-ray diffraction spectroscopy and electrochemical measurement were applied to investigate the microstructure and corrosion resistance of prepared Zn-Ni alloy coating and zinc coating. Results showed that the corrosion resistance of Zn-Ni alloy coating was closely related with its intrinsic microstructures. The prepared Zn-Ni alloy was identified as in γ phase with the structure of regular tetrahedron and the mass content of 15. 96% Ni and 84. 02% Zn. The electrochemical test results of ZnNi coating and zinc coating in 5% NaCl solution indicated that the electrochemical impedance of Zn-Ni coating was 7. 2 times than that of zinc coating,and the corrosion potential of Zn-Ni coating was positively shift 0. 1279V to zinc coating. But the corrosion current density of Zn coating was 5. 78 times than that of Zn-Ni coating.