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机械镀Zn-25%Sn合金镀层因其良好的耐盐水和含盐蒸气腐蚀性能,适宜在海洋性腐蚀环境中服役,已被澳大利亚等临海国家广泛应用并列入其工业标准。本试验分别采用还原沉积和携带沉积两种方法在钢铁制品表面上获得了平均锡含量达25%以上的机械镀Zn-Sn合金镀层。针对样品的镀层结构和形层规律进行的分析比较结果表明:在不同的沉积条件下,还原沉积Zn-25%Sn镀层的形成以还原沉积和机械碰撞镶嵌形层为主,吸附沉积为辅;携带沉积Zn-25%Sn镀层的形成以吸附沉积和机械碰撞镶嵌形层为主,还原沉积为辅。
Mechanical plating Zn-25% Sn alloy coating due to its good resistance to salt water and salt vapor corrosion, suitable for use in marine corrosive environment, has been widely used by countries such as Australia and other coastal countries included in its industry standards. In this experiment, two methods of reduction deposition and carrying deposition were respectively used to obtain the mechanical plating Zn-Sn alloy coating on the surface of steel products with the average tin content of over 25%. The results of the analysis and comparison of the coating structure and regularity of the sample show that the formation of Zn-25% Sn coating is mainly reductive sedimentation and mechanical impact mosaic, and the adsorption and deposition is the second, under different deposition conditions. The formation of Zn-25% Sn-carrying deposits is dominated by adsorption and mechanical impact mosaic, supplemented by reductive deposition.