重金属离子对5052铝合金耐蚀性能的影响  

Effect of Heavy Metal Ions on the Corrosion of Aluminum Alloy 5052

作　　者：云凤玲[1] 徐克[1] 

机构地区：[1]国家海洋局天津海水淡化与综合利用研究所,天津300192

出　　处：《化学工业与工程》2010年第2期173-176,共4页Chemical Industry and Engineering

基　　金：国家科技支撑计划项目(项目编号:2006BAB03A01)

摘　　要：采用70℃脱氧人工海水模拟低温多效蒸馏海水淡化设备内部的特殊腐蚀环境,分析了不同含量的重金属Cu2+、Fe3+对5052铝合金腐蚀情况的影响。极化曲线结果表明,溶液中的微量重金属离子(10-9级)也会在铝合金表面沉积,使铝合金自腐蚀电位正移,但却不会破坏铝合金表面自然氧化膜,使点蚀电位保持不变。而腐蚀失重结果表明,随着溶液中氯离子对氧化膜的侵蚀、破坏,表面沉积金属与铝基体的耦合将加快铝合金腐蚀过程。Effect of trace heavy metal ions, e. g. , Cu2 ＋ and Fe3＋ , on the corrosion behavior of aluminum alloy 5052 immersed in 70 ℃ deaerated artificial seawater were investigated in terms of similar corrosion occurring in low-temperature multi-effect distillator. The polarization curves showed that, trace heavy metal ions （10^-9 level） in the solution could result in the corrosion potential shifted positively, due to the deposition of heavy metal ions on the surface of aluminum alloy. But the pitting potential did not change with the content variation of heavy metal ions. This indicated that the heavy metal deposition could not in- fluence the surface natural oxide film of aluminum alloy at the initial corrosion stage. The corrosion weight loss results showed that as the destruction of oxide film by chloride ions, the galvanic coupling of deposition metal and aluminum substrate will accelerate the subsequent corrosion process.

关 键 词：重金属离子 5052铝合金 腐蚀 自腐蚀电位 点蚀电位 

分 类 号：TG172.5[金属学及工艺—金属表面处理]