AM60压铸镁合金表面微弧氧化陶瓷层的耐蚀性电化学分析
Electrochemical Analysis of Corrosion Resistance of Micro-arc Oxidized Die-casting Magnesium Alloy AM60
摘 要
为了探索AM60压铸镁合金微弧氧化陶瓷层的耐蚀性,采用IM6e型电化学工作站,测量了不同表面状态下制备10 μm、20 μm及30 μm三种厚度微弧氧化陶瓷层在3.5% NaCl溶液中的电化学极化曲线,并对其进行了Tafel斜率分析.结果表明:微弧氧化处理,可以使AM60压铸镁合金的腐蚀电流密度降低2~4个数量级;压铸镁合金在原始表面状态下进行微弧氧化,其腐蚀电流密度随着处理厚度的增加而降低,厚度为30 μm试样的腐蚀电流密度较低;对压铸镁合金处理前进行打磨,可以进一步降低腐蚀电流密度,在微弧氧化陶瓷层厚度为20 μm时获得最低的腐蚀电流密度.
耐蚀性
微弧氧化
压铸镁合金
polarization curve
corrosion resistance
micro-arc oxidation (MAO)
die-casting magnesium alloy
Abstract
The effect of the surface state of micro-arc oxidation (MAO) films on corrosion resistance of die-casting AM60 Magnesium alloys in 3.5% NaCl solution was investigated by means of polarization curve measured with IM6e electrochemistry workstation.The thickness of MAO films samples was 10 μm,20 μm and 30 μm respectively.The Tafel slopes were analyzed.The results showed that the Icorr was decreased by a factor of 100 to 10000 times due to MAO treatment.The Icorr of samples decreased with the increase of thickness of the films,when the surface of samples was not polished.A lower Icorr could be obtained when the thickness of the films was 30 μm.The Icorr of oxide films could be decreased further more by surface polishing,and the lowest Icorr could be obtained when the thickness of the films was 20 μm.
中图分类号 TG174.453
所属栏目 试验研究
基金项目 长安大学青年科技基金项目(06Q03)
收稿日期 2008/12/15
修改稿日期 2009/2/10
网络出版日期
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备注陈宏,讲师.
引用该论文: CHEN Hong,WANG Wen-li,HAO Jian-min. Electrochemical Analysis of Corrosion Resistance of Micro-arc Oxidized Die-casting Magnesium Alloy AM60[J]. Corrosion & Protection, 2009, 30(8): 545～547
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