碱性锌酸盐体系电沉积Zn-Ni合金镀层的研究还不系统.采用扫描电子显微镜(SEM)、能量色散谱仪(EDX)、电化学阻抗谱(EIS)等研究了碱性锌酸盐体系中A3钢表面Zn-Ni合金镀层的共沉积行为,考察了阴极偏压对Zn-Ni合金镀层成核/生长速率的影响规律.结果表明:通过恒电流电沉积技术得到的Zn-Ni合金镀层表面平整光亮,镀层中Ni含量为10.6％;Zn-Ni合金镀层的沉积过程遵循异常共沉积机制,镀液中的Zn2阻碍了Ni2的阴极还原反应过程;Zn-Ni合金镀层的沉积速率随着阴极偏压的变负而呈指数规律提高.
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