采用电化学方法研究了Cu-Zn-Al形状记忆合金(SMA)及其化学镀镍磷表面改性试样在Tyrode's人工体液中的腐蚀行为.结果表明，在Tyrode's人工体液中Cu-Zn-Al SMA发生脱锌腐蚀.化学镀镍磷Cu-Zn-Al SMA随NaCl浓度增加、pH值降低、环境温度升高，阳极活性电流密度增大，电化学溶解敏感性增强.X-射线衍射分析结果表明，Cu-Zn-Al SMA表面化学镀镍磷后，形成了非晶态镀层，其在Tyrode's人工体液中的耐蚀性显著提高；这是由于改性表面形成均匀、稳定的阻碍性镀层，有效地将基体金属和外界腐蚀介质隔绝而达到防护作用. 镀镍磷
The corrosion behavior of Cu-Zn-Al shape memory alloys (SMA) with and without electroless nickel plating was investigated by electrochemical methods in artificial Tyrode's solution.The results showed that Cu-Zn-Al suffered from engendered dezincifica-tion corrosion in Tyrode's solution.The an odic active current densities as well as electrochemical dissolution sensitivity of the electroless nickel plated Cu-Zn-Al SMA increased with the increasing NaCl concentr ation,decreasing pH value and rising temperature of the solution.X-ray diffracti on analysis indicated that after electroless nickel plating,an amorphous film formed on the surface of Cu-Zn-Al SMA.This film can effectively isolate the matrix metal from corrosion media and significantly improve the corrosion resistance of the Cu-Zn-Al SMA in artificial Tyrode's solution.
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