在恒电位脉冲的条件下,pH控制在0.8～1,阴极电流密度为12～20 A*dm-2,周期为25 ms,占空比为0.3,镀液温度维持在20～30 ℃,采用循环镀液的方法以避免二价铬离子的干扰,从含三价铬离子的镀液中电沉积出镍-铁-铬合金.X射线衍射结果表明沉积的镀层为晶体结构,存在较强的(111)织构.能谱和扫描电镜的结果显示电沉积出的镍-铁-铬合金镀层中含有少量的硫,其晶粒尺寸小于100 nm.通过这种方法可以获得厚镀层.电化学分析表明随着电流密度的增大,镀层的耐蚀性相应增强.
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