【摘要】 为提升灯具外壳抗腐蚀性能，对比研究了三种钝化工艺(化学、阴极电化学及混合法)对无氰锡仿金电镀层的影响。以硫酸铜和锡酸钠为原料制备镀液，采用电镀仪在金属基材表面沉积镀层，从宏观和微观角度观察腐蚀情况，并使用线性扫描伏安研究试腐蚀速率。结果表明，不同钝化方式影响镀层宏观形貌，其中混合钝化法表现最佳，腐蚀坑少且浅，钝化后的镀层抗腐蚀性能良好，金色光泽持久；微观分析显示，未钝化的镀层腐蚀后结构疏松，而钝化后的镀层结构紧密，其中混合钝化的镀层结构最为致密。Tafel试验进一步证实，混合钝化膜的耐腐蚀性能更佳，化学钝化与阴极电化学钝化保护效果相近。更多还原

【Abstract】 In order to improve the corrosion resistance of the lamp shell, this study compares the effects of three passivation processes(chemical, cathode electrochemical and mixing method) on cyanide-free tin imitation gold plating layer. The plating solution was prepared from copper sulfate and sodium tinate, deposited the plating layer on the surface of the metal substrate, observed the corrosion situation from macroscopic and microscopic angles, and tested the corrosion rate by linear scanning voltammetry. The results show that different passivation methods affect the macroscopic morphology of coating, in which the mixed passivation method has the best performance, corrosion pits are less and shallow, the passivation coating has good corrosion resistance and durable structure, while the passivation coating structure is tight, and the mixed passivation coating structure is the most compact. The Tafel test further confirmed that the mixed passivation film has better corrosion resistance, and the chemical passivation effect is similar to the cathode electrochemical passivation protection effect.更多还原