原位阻抗谱研究$\beta$相对镁--铝合金初期大气腐蚀行为的作用

材料研究学报

2010, Vol. 24

Issue (3): 245-253

研究论文

本期目录 | 过刊浏览

原位阻抗谱研究$\beta$相对镁--铝合金初期大气腐蚀行为的作用

贾瑞灵², 翟熙伟², 严川伟¹, 王福会¹

1.中国科学院金属研究所~金属腐蚀与防护国家重点实验室沈阳 110016
2.内蒙古工业大学材料学院~内蒙古轻金属材料重点实验室呼和浩特 010051

Effect of $\beta$ Phase on the Initial Atmospheric Corrosion Behaviour of the Magnesium-Aluminum Alloys by n-situ
Electrochemical Impendence Spectra

JIA Ruiling², ZHAI Xiwei², YAN Chuanwei¹, WANG Fuhui¹

1.State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2.Key Laboratory for Superlight Materials of Inner Mongolia, Inner Mongolia University of Technology, Huhhot 010051

引用本文:

贾瑞灵翟熙伟严川伟王福会. 原位阻抗谱研究$\beta$相对镁--铝合金初期大气腐蚀行为的作用[J]. 材料研究学报, 2010, 24(3): 245-253.
. Effect of $\beta$ Phase on the Initial Atmospheric Corrosion Behaviour of the Magnesium-Aluminum Alloys by n-situ
Electrochemical Impendence Spectra[J]. Chin J Mater Res, 2010, 24(3): 245-253.

全文: PDF(1925 KB)

摘要:

采用原位电化学阻抗(EIS)技术研究了薄液膜条件下β相对镁铝合金初期腐蚀行为的影响。结果表明由NaCl诱发的镁合金初期大气腐蚀, β相起到了关键作用。在早期的10 h内, β相体积分数较多的镁合金对应阻抗谱的电荷转移电阻比较大, 表明其腐蚀速率较慢, 这是由于镁合金中β相相对耐蚀。但在高浓度Cl^-作用下, 随暴露时间的延长, 一旦突破合金表面β相的阻碍后电荷转移电阻明显下降, 腐蚀速率加快。β相体积分数较少的镁合金随着暴露时间的延长, 腐蚀产物膜的保护性明显优于β体积分数较多的镁合金, 这有助于减缓β相体积分数较少的镁合金基体在暴露后期的腐蚀速率。

关键词 ：镁-铝合金, β相, 大气腐蚀, 电化学阻抗

Abstract：

The in-situ electrochemical impedance spectrum measurements were conducted to investigate the early stage of the atmospheric corrosion behavior of the magnesium alloys with different volume fractions of β phase. The results indicated that β phase played a key role in the course of atmospheric corrosion of the magnesium alloys that was induced by NaCl particles centralized in the early time period. During the early ten hours the magnesium alloys with high volume fraction β phase had a bigger chargetransfer resistance, showing a better corrosion resistance. This phenomenon could be attributed to the better corrosion resistance of β phase. However, a faster corrosion occurred for the magnesium alloys with high volume fraction β after ten hours when the β phases were broken and the charge-transfer resistance dropped dramatically due to the high concentration of Cl−. As the exposure time prolonged, the protective function of the corrosion product films in Mg–3Al alloy was significantly better than those in the other two alloys as they helped slow down the corrosion rate of magnesium alloys with less volume fraction β phase.

Key words： magnesium-aluminum alloy β phase atmospheric corrosion Electrochemical Impendence Spectra

收稿日期: 2009-11-27

ZTFLH:

TG172

基金资助:

国家自然科学基金50571105资助项目。

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