通过高速旋转腐蚀试验、X射线衍射、扫描电镜(SEM)及能谱分析(EDAX)、电化学特征测定等对Cu-2.9Sn-0.9Al铜合金在人工海水中的腐蚀行为进行了研究.结果表明,添加2.9%Sn、0.9%Al的铜合金在室温、pH值为8.2的人工海水中具有较好的耐腐蚀性.其高耐蚀性主要是由于在合金表面形成一层氧化膜,它对阳极过程和阴过程都有影响.这层膜是Cu的氧化物和Sn的氧化物及Cu-Al-Mg共析化合物的复合保护膜.它们的协同作用降低了氧化层的孔隙度,从而避免了局部酸性区域的形成而导致的局部腐蚀.
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