微量铟对稀土铝黄铜腐蚀性能的影响

摘要

The effect of trace indium on the corrosion resistance of rare-earth aluminum brass was studied by means of weight loss measurement,electrochemical testing,XRD and scanning electron microscopy.The results show that the average corrosion rate of the ceric aluminum brass was 7.3×10-3 mm/a,with the addition of trace indium,the polarization resistance was greatly improved and the free corrosion current density was reduced,the average corrosion rate was 6.7×10-3 mm/a.The trace In can improve the structure of the corrosion film and after corrosion in 3.5% NaCl solution,a tight and integrated corrosion film was formed on the surface of the matrix and the film can inhibit the diffusion of Zn atoms from the matrix to the solution to a certain extent.Besides,In can reduce the release of hydrogen from Zn,and thus can further inhibit the dezincification of brass.%采用失重法、X射线衍射法、电化学测试、扫描电镜等手段对比分析研究了铈铝黄铜和添加微量铟的新型铝黄铜的耐蚀性能。结果表明,铈铝黄铜的平均腐蚀速率为7.3×10-3 mm/a,新型铝黄铜的腐蚀速率为6.7×10-3mm/a。添加铟后能大幅度提高极化电阻,从而减小了腐蚀电流密度,耐腐蚀性能进一步得到提高;铟的加入改善了膜的结构,含In铈铝黄铜在NaCl（3.5%）溶液中腐蚀后表面形成了一层致密、完整的腐蚀产物膜,一定程度地抑制了脱锌;铟能减少锌的析氢反应,从而进一步抑制了黄铜的脱锌腐蚀。因此微量铟的加入可以改善稀土铝黄铜的腐蚀性能。