铜合金在海水中的腐蚀行为研究

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），高化学特征测定等对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。

Corrosion Behavior of Copper Alloy in Seawater

Corrosion behavior of Cu-2. 9Sn-0. 9A1 alloy in seawater was studied by high speed rotating corrosion test, XRD, SEM, EDAX, and electrochemical method. Results showed the copper alloy with 2.9%Sn and 0.9%Al had excellent corrosion resistance in artificial seawater of pH = 8.2 at ambient temperature. The high corrosion resistance was due to ibrming an oxidation film on the surface of alloy, which might affect both the anodic and cathodic pro-cess. The film was consisted of copper oxide and tin oxide and Cu-Al-Mg complex compound, whose synergetic effect made the porosity of oxide coating decreasing, thus avoided the local corrosion resulted by formation of local acidic area.