Corrosion Behavior of 3A21 Aluminum Alloy in Ethylene Glycol-water Solution
摘 要
采用电化学方法研究了3A21铝合金在乙二醇水溶液中在不同浓度、温度和浸泡时间条件下的腐蚀电化学行为。采用扫描电子显微镜研究了腐蚀前后3A21铝合金的形貌及表面腐蚀产物。结果表明,随着乙二醇水溶液浓度的增加,铝合金腐蚀速率下降; 随着溶液温度升高,铝合金腐蚀速率增大; 随着铝合金浸泡时间的延长,一方面,氧化膜的生成和溶解达到动态平衡,另一方面氧化膜薄弱区出现点蚀,点蚀的发展伴随着点蚀的自愈合,并向点蚀加剧方向发展。
Abstract
The electrochemical corrosion behaviors of 3A21 aluminum alloy in ethylene glycol-water solutions at different temperatures, concentrations and immersion times were studied by electrochemical methods. The surface characteristics and corrosion products were examined by scanning electron microscopy (SEM). It was found that with increasing the ethylene glycol concentration, the corrosion rate of the aluminum alloy decreased, and with increasing the temperature, the corrosion rate of the alloy increased. With increasing the immersion time, the formation and dissolution of oxide film on the alloy achieved dynamic equilibrium, and pitting appeared at the weak areas on the oxide film. The development of pitting was accompanied by pitting self-healing and pitting aggravation.
中图分类号 TG174.4
所属栏目 试验研究
基金项目 四川理工学院省级大学生创新创业训练计划项目(201310622026); 四川理工学院研究生创新基金(y2012012)
收稿日期 2013/12/27
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备注龚敏(1963-),教授,硕士,从事材料腐蚀与防护研究,
引用该论文: FAN Jin-long,GONG Min,HOU Xiao,LI Xing-qiang,LUO Yan-guang,KANG Bo,SUN Wei,GUO Mei-bo,LIANG Xian-zhong. Corrosion Behavior of 3A21 Aluminum Alloy in Ethylene Glycol-water Solution[J]. Corrosion & Protection, 2014, 35(11): 1116
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参考文献
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【5】XU L Y,CHENG Y F. Electrochemical characterization and CFD simulation of flow-assisted corrosion of aluminum alloy in ethylene glycol-water solution[J]. Corrosion Science,2008,50:2094-2100.
【6】胡丽华,常炜,路民旭,等. 乙二醇对海底管道CO2腐蚀的抑制作用[J]. 腐蚀与防护,2012,33(6): 463-469.
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