海水中铜试样溶出的铜离子对铝合金腐蚀的影响

Influences of Copper Ions Dissolved out of Copper Samples on Corrosion of Aluminum Alloys in Seawater

目的研究在海水中暴露的铜试样溶出的铜离子对邻近铝合金腐蚀的影响。方法采用海水暴露试验方法。结果在青岛和厦门海水中获得了4种铝合金在铜试样邻近暴露1年的腐蚀结果。结论在海水中暴露的铜试样溶出的铜离子使邻近海水的铜离子浓度升高。对在试验期间没发生局部腐蚀的LF3M,180YS和LC4CS(BL),铜试样溶出的铜离子对其腐蚀没影响。对在试验期间发生点蚀和缝隙腐蚀的铝合金LD2CS,铜试样溶出的铜离子显著加速了它的腐蚀。

Objective To learn influences of copper ions dissolved out of copper samples exposed to seawater on corrosion of neighboring aluminum alloys. Methods The method of exposure test in seawater was adopted. Results Corrosion results of four kinds of aluminum alloys in Qingdao and Xiamen for 1 year of exposure were obtained. Conclusion Copper ions dissolved out of the copper samples exposed to seawater make the ion concentration around the seawater increase. Copper ions dissolved out of the copper samples have no influence on the corrosion of LF3M, 180YS and LC4CS（BL）, which does not suffer from local corrosion during the test. Copperions dissolved out of the copper samples obviously increase the corrosion of LD2CS which suffers from pitting and crevice corrosion during the test.