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海水温度对Al-Zn-Ga-Si低电位牺牲阳极性能的影响

DOI: 10.11903/1002.6495.2014.083, PP. 259-263

Keywords: Al合金,低电位,牺牲阳极,电化学性能

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Abstract:

采用恒电流实验评价了Al-Zn-Ga-Si牺牲阳极在不同温度海水中的电化学性能,并利用电化学阻抗谱研究了其电化学行为,探讨了温度对阳极活化溶解的影响机制。结果表明随着海水温度的降低,阳极的开路电位和工作电位均呈正移趋势,但工作电位在-0.770~-0.850V之间。在低温下阳极的溶解性能变差,呈不同程度的局部腐蚀溶解,原因是温度降低影响了阳极表面活化溶解点产生的活化金属离子的扩散。

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