铝基合金牺牲阳极在干湿交替环境中的耐腐蚀性能  

Anti-corrosion Performance of Al-based Alloys for Sacrificial Anode in Wet-dry Cyclic Environment

作　　者：方志刚[1] 刘斌[1] 王涛[1] 王洪仁 

机构地区：[1]海军装备研究院,北京100161 [2]中船重工七二五所海洋腐蚀与防护重点实验室,青岛266101

出　　处：《腐蚀科学与防护技术》2013年第1期39-44,共6页Corrosion Science and Protection Technology

摘　　要：测试潜艇常用的4种牺牲阳极在不同干湿交替周期的电化学阻抗谱,分析了它们的耐腐蚀性能.结果表明,干湿交替条件下阳极失效的主要原因是腐蚀产物覆盖致使阳极表面的活性溶解点减少,阻碍阳极的进一步活化.经过一定的干湿交替循环后有些阳极结壳严重,导致容抗弧增大,阳极的活化溶解能力大大降低.在干湿交替环境中,合金的使用性能从差到好的顺序为:Zn-Al-Cd<Al-Zn-In-Cd<Al-Zn-In-Mg-Ti<Al-Zn-In-Mg-Ga-Mn.Electrochemical impedance spectroscopy （EIS） was used to study the corrosion behavior of four Al-based alloys commonly used as sacrificial anode for submarine under wet-dry cyclic conditions with various drying periods. The EIS results showed that the failure of the sacrificial anodes was mainly attributed that the coverage effect of corrosion products on the surface of sacrificial anodes, leading to the decrease of the number of active sites on the anode surface. Thus, the further activation of the sacrificial anodes was prevented. After several wet-dry cycles, the severe accumulation of corrosion products on the anode surface resulted in enlargement at the capacitive loops, indicating significant decrease of the active dissolution of the anodes. The performance of the 4 Al-based alloys under wet-dry cyclic environment may be ranked as the following order： Zn-AI-Cd 〈 A1-Zn-In-Cd 〈 A1-Zn-In-Mg-Ti 〈 A1-Zn-In-Mg-Ga-Mn.

关 键 词：牺牲阳极 干湿交替 电化学阻抗谱 腐蚀 

分 类 号：TG174.4[金属学及工艺—金属表面处理]