为了对Cr颗粒尺寸如何影响Ni-Cr复合镀层的电化学腐蚀性能有更深的认识,采用复合电镀技术,通过向普通电镀溶液中分别加入平均粒度约为40nm和1～5μm Cr粉的方法,在Ni基材上制备了2种Cr含量相近的Ni-Cr复合镀层.利用动电位极化及交流阻抗技术对比研究了2种Ni-Cr复合镀层及纯Ni镀层在0.5mol/L NaCl+0.05mol/L H2SO4的酸性溶液中的电化学腐蚀行为.实验结果表明:在0.5mol/L NaCl+0.05mol/L H2SO4溶液中, 与微米Cr分布的Ni-Cr复合镀层相比,Ni-Cr纳米复合镀层独特的结构有利于快速形成稳定而又富Cr保护性钝化膜,使得Ni-Cr纳米复合镀层表现出优异的耐蚀性能.
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