氯化铈对镁合金在NaCl溶液中的缓蚀作用
Inhibition Effect of Rare Earth on Magnesium Alloy in NaCl Solution
摘 要
采用电化学阻抗法和动电位极化曲线法研究了氯化铈对镁合金AZ31在3.5% NaCl溶液中腐蚀行为的影响, 用扫描电镜(SEM)和能谱仪(EDS)分析了腐蚀产物膜的形貌和成分。结果表明, 当NaCl溶液中加入50~200 mg/L氯化铈时, 镁合金的腐蚀速率均有降低, 当稀土含量为100 mg/L时, 腐蚀速率最低; 加入适当的稀土, 腐蚀产物膜的均匀性和致密性较好, 不存在微裂纹等缺陷; 浸泡试验结果证实了稀土对镁合金的缓蚀作用。
氯化铈
缓蚀
Mg alloy
CeCl3
corrosion inhibition
Abstract
The effect of CeCl3 on the corrosion behaviors of AZ31 Mg alloy in 3.5% NaCl solution was investigated by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. The morphology and chemical composition of the corrosion products were analyzed by SEM and EDS. The results showed that the corrosion rate of AZ31 Mg alloy was reduced by adding CeCl3 with concentrations of 50~200 mg/L, and the lowest corrosion rate was at the concentration of 100 mg/L. Uniformity and density of corrosion product was good, and there were no micro-cracks. The corrosion inhibition effect was confirmed by immersion experiment.
中图分类号 TG174.42
所属栏目 应用技术
基金项目
收稿日期 2010/8/11
修改稿日期 2010/10/18
网络出版日期
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联系人作者张云霞(yun927@163.com)
引用该论文: ZHANG Yun-xia. Inhibition Effect of Rare Earth on Magnesium Alloy in NaCl Solution[J]. Corrosion & Protection, 2011, 32(6): 494
被引情况:
【1】屈菊平, "稀土盐氯化铈、硝酸镧对防锈铝合金的缓蚀作用",腐蚀与防护 34, 893-895(2013)
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参考文献
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【2】Song G L, St John D. Corrosion behaviour of magnesium in ethylene glocol[J]. Corrosion Science, 2004, 46(6):1381-1399.
【3】Huo H W, Li Y, Wang F H. Corrosion of AZ91D magnesium alloy with a chemical conversion coating and electroless nickel layer[J]. Corrosion Science, 2004, 46(6):1467-1477.
【4】Salman S A, Ichino R, Okido M. Improvement of corrosion resistance of AZ31 Mg alloy by anodizing with co-precipitation of cerium oxide[J]. Transactions of Nonferrous Metals Society of China, 2009, 19(4):883-886.
【5】Schmutz P, Cuillaumin V, Lillard R S, et al. Influence of dichromate ions on corrosion processes on pure magnesium[J]. Journal of Electrochemical Society, 2003, 150(4):B 99-B110.
【6】Cheng Y L, Qin T W, Wang H M, et al. Comparison of corrosion behaviors of AZ31, AZ91, Am60 and Zk60 magnesium alloys[J]. Transactions of Nonferrous Metals Society of China, 2009, 19(3):517-524.
【7】Slacheva E, Petkova G, Andreev P. Inhibition of corrosion of AZ91 magnesium alloy in ethylene glycol solution in presence of chloride anions[J]. Materials and Corrosion, 2005, 56:83-87.
【8】汪兵, 刘清友, 王向东, 等. 稀土Ce和La对碳钢在NaCl溶液中的缓蚀机理[J]. 中国腐蚀与防护学报, 2007, 27(3):151-155.
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