【摘要】 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 -AlSMA发生脱锌腐蚀 .化学镀镍磷Cu -Zn -AlSMA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 -AlSMA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 .更多还原

【Abstract】 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 dezincification corrosion in Tyrode’s solution.The anodic active current densities as well as electrochemical dissolution sensitivity of the electroless nickel plated Cu-Zn-Al SMA increased with the increasing NaCl concentration,decreasing pH value and rising temperature of the solution.X-ray diffraction 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.更多还原