镀层合金与碳钢基底的电偶腐蚀研究  

Galvanic Corrosion Study of Surface Coating and Steel Substrate

作　　者：张杰[1] 李晓龙[1,2] 张鑫[1,2] 王翠[1,3] 

机构地区：[1]中国科学院海洋研究所,山东青岛266071 [2]中国科学院大学,北京100049 [3]重庆大学化学化工学院,重庆400044

出　　处：《广西科学院学报》2015年第3期187-191,共5页Journal of Guangxi Academy of Sciences

基　　金：国家自然科学基金项目(41006054)资助

摘　　要：【目的】为寻求钢基底最佳抑制电偶腐蚀的热浸镀层材料,研究2种镀层合金与碳钢组成的电偶是否发生危害极大的极性逆转现象。【方法】选择Zn-55%Al-1.6%Si合金和Zn-5%Al-0.2%RE合金,分别与碳钢组成耦合电极,测试其在天然海水及不同浓度Cl-介质中的电偶电流等。【结果】海水体系以及Cl-浓度为0.005%,0.01%,0.5%体系中,2种镀层合金与碳钢组成的电偶均未出现极性逆转现象。对于同一种镀层合金与碳钢组成电偶,其偶合电流在不同浓度的Cl-中电流值不同,随着Cl-浓度的增加,其偶合电流也增加。【结论】钢基底热浸镀Zn-55%Al-1.6%Si合金或Zn-5%Al-0.2%RE可以有效抑制电偶腐蚀。【Objective】In this paper,in order to study whether the polarity reversal phenomenon is occurred after the damage of the hot-dipped coating.【Methods】The coupling electrodes were composed of Zn-55%Al-1.6%Si alloy,or Zn-5%Al-0.2%RE and alloyed with carbon steel.The galvanic current was tested in natural seawater and medium with different Clconcentrations to study the possibility of polarity reversals.【Results】The experimental results show that the galvanic couple composed with two kinds of coating alloys and carbon steel did not occur the polarity reversal phenomenon in all the experimental conditions.【Conclusion】The coupling current value of the galvanic couple composed with the same coating alloy and carbon steel was different in different Cl-concentrations medium.With the increase of the Cl-concentration,the coupling current was increased.

关 键 词：热浸镀层极性逆转 电偶电流 

分 类 号：TG174[金属学及工艺—金属表面处理]