ZK60镁合金在卤化钠溶液中的腐蚀行为研究

doi:10.11902/1005.4537.2015.038

中国腐蚀与防护学报

2015, Vol. 35

Issue (3): 245-250 DOI: 10.11902/1005.4537.2015.038

研究报告

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ZK60镁合金在卤化钠溶液中的腐蚀行为研究

徐宏妍(

),第五江涛,刘霞,杨亚琴

Corrosion Behavior of ZK60 Magnesium Alloy in Sodium Halide Solutions

Hongyan XU(

),Jiangtao DIWU,Xia LIU,Yaqin YANG

School of Materials Science and Engineering, North University of China, Taiyuan 030051, China

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摘要:

通过动电位极化曲线和静态失重法研究了ZK60镁合金在3.5%卤化钠NaX (X=F,Cl,Br和I) 溶液中的腐蚀行为,并且利用SEM观察了ZK60镁合金的腐蚀形貌。结果表明：ZK60镁合金在3.5%NaX溶液中的开路电位先上升然后逐渐趋于平缓,最后达到一个较稳定的值。ZK60镁合金的电化学行为与溶液中卤素离子的种类有关,在3.5%NaF溶液中处于钝化状态,而在3.5%NaCl,3.5%NaBr和3.5%NaI溶液中则处于腐蚀状态且腐蚀速率随浸泡时间的延长而减小,其主要原因是溶液pH值的升高和腐蚀产物所起的保护作用。

关键词 ： ZK60镁合金, 腐蚀, 卤化钠溶液

Abstract：

The corrosion behavior of ZK60 magnesium alloy in 3.5% sodium halides NaX (X=F, Cl, Br and I) solutions was studied by means of static immersion methods, potentiodynamic polarization measurement and SEM observation. The results showed that, the open circuit potential (OCP) of ZK60 alloy in 3.5% sodium halides solutions increased first and then became flat to a steady state. The corrosion behavior of ZK60 alloy was related to the halogen ions in the solutions: i.e. it was passivated in 3.5%NaF solution, while it was corroded in 3.5%NaCl, 3.5%NaBr and 3.5%NaI solutions and its corrosion rate decreased with immersion time, which may be ascribed to the formed protective corrosion products with the increasing pH value of the solutions.

Key words： ZK60 magnesium alloy corrosion sodium halide solution

基金资助:山西省青年科技研究基金项目 (2011021020-2),山西省人社厅留学回国人员科技活动择优项目和山西省自然科学基金项目 (2012011022-2) 资助

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引用本文:

徐宏妍,第五江涛,刘霞,杨亚琴. ZK60镁合金在卤化钠溶液中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2015, 35(3): 245-250.
Hongyan XU, Jiangtao DIWU, Xia LIU, Yaqin YANG. Corrosion Behavior of ZK60 Magnesium Alloy in Sodium Halide Solutions. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 245-250.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.038 或 https://www.jcscp.org/CN/Y2015/V35/I3/245

图1 ZK60 镁合金在3.5%Na X( X=F, Cl, Br 和I) 溶液中的开路电位随时间的变化曲线

图2 在3.5%NaF溶液中浸泡10, 30, 60和120 min后的ZK60镁合金表面XRD谱及放大图

图3 ZK60 镁合金在3.5%Na X( X=F，Cl，Br 和I) 溶液中的动电位极化曲线

表1 ZK60镁合金在不同卤化钠溶液中浸泡不同时间下的腐蚀电位 (Ecorr) 和腐蚀电流密度 (Icorr)

图4 卤化钠溶液的pH值随ZK60镁合金浸泡时间的变化曲线

图5 ZK60镁合金在3.5%Na X(X=F, Cl, Br和I) 溶液中浸泡48 h 后的腐蚀形貌

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