镁合金微弧氧化膜在乙二醇水溶液中的腐蚀行为
Corrosion Behavior of MAO Coating on Magnesium Alloy in Ehylene Glycol Aqueous Solution
摘 要
通过电化学阻抗谱及相应的等效电路研究了AZ91D镁合金微弧氧化(MAO)膜在乙二醇水溶液中的腐蚀行为, 采用扫描电镜对表面腐蚀形貌进行了观察。结果表明: 乙二醇吸附至MAO膜表面后, 逐步形成了一层致密的防护膜, 随乙二醇浓度增大, 电荷转移电阻增大, MAO膜的耐腐蚀性能提高; 腐蚀性离子(Cl-与SO42-)在乙二醇水溶液中共存时, 腐蚀作用加强; 添加了0.2 mol·L-1 NaF后, 由于生成了难溶于水的含氟晶体, 填充了MAO膜的多孔层空隙, 对镁合金微弧氧化膜起到了有效的缓蚀作用。
AZ91D镁合金
乙二醇
腐蚀行为
电化学阻抗谱
MAO coating
AZ91D magnesium alloy
ethylene glycol
corrosion behavior
electrochemical impedance spectroscopy (EIS)
Abstract
The corrosion behavior of micro-arc oxidation (MAO) coating on AZ91D magnesium alloy in ethylene glycol aqueous solution was investigated using electrochemical impedance spectroscopy (EIS) and relative equivalent circuits. Scanning electron microscopy (SEM) was employed to examine the surface morphologies of samples after corrosion. The results show that the ethylene glycol adsorbed and formed a layer of protective film on the surface of MAO coating; with increasing concentration of ethylene glycol the charge transfer resistance increased, and the corrosion resistance of MAO coating on AZ91D magnesium alloy improved. Corrosive ions (Cl- and SO42-) coexisting in ethylene glycol aqueous solution enhanced corrosivity of the MAO coating. The corrosion of AZ91D magnesium alloy coated MAO was effectively inhibited by addition of 0.2 mol·L-1 NaF because the insoluble fluoride containing crystals filled the interspaces in porous layer of the MAO coating.
中图分类号 TG146
所属栏目 材料性能及其应用
基金项目 甘肃省创新研究群体计划(1111RJDA011); 西北师范大学青年教师科研能力提升计划(NWNU-LKQN-11-33)
收稿日期 2012/7/30
修改稿日期 2013/4/3
网络出版日期
作者单位点击查看
备注郭惠霞(1974-), 女, 甘肃榆中人, 博士研究生。
引用该论文: GUO Hui-xia,MA Ying,DONG Hai-rong,ZHANG Yu-fu,HAO Yuan. Corrosion Behavior of MAO Coating on Magnesium Alloy in Ehylene Glycol Aqueous Solution[J]. Materials for mechancial engineering, 2013, 37(6): 42～47
郭惠霞,马颖,董海荣,张玉福,郝远. 镁合金微弧氧化膜在乙二醇水溶液中的腐蚀行为[J]. 机械工程材料, 2013, 37(6): 42～47
被引情况:
【1】余强,陈阵,魏昶, "硫脲对HR-2不锈钢的缓蚀性",腐蚀与防护 35, 116-119(2014)
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【4】陈显明, 罗承萍, 刘江文.AZ91 镁合金表面微弧氧化膜微观结构的TEM表征[J].机械工程材料, 2011, 35(2): 58-62.
【5】GUO H X, MA Y, WANG Y S, et al. Corrosion behaviour of MAO coated AZ91D magnesium alloys in different concentrations of NaCl solutions[J].Trans Nonferrous Met Soc China, 2012, 22(7): 1786-1793.
【6】GUO H, AN M, XU S, et al. Microarc oxidation of corrosion resistant ceramic coating on a magnesium alloy[J].Materials Letters, 2006, 60(12): 1538-1541.
【7】CAI Q, WANG L, WEI B, et al. Electrochemical performance of microarc oxidation films formed on AZ91D magnesium alloy in silicate and phosphate electrolytes[J].Surface and Coatings Technology, 2006, 200(12/13): 3727-3733.
【8】SONG G, STJOHN D. Corrosion behaviour of magnesium in ethylene glycol[J].Corrosion Science, 2004, 46(6): 1381-1399.
【9】FEKRY A M, FATAYERJI M Z. Electrochemical corrosion behavior of AZ91D alloy in ethylene glycol[J].Electrochimica Acta, 2009, 54(26): 6522-6528.
【10】EL-TAIB H F, FEKRY A M, FATAYERJI M Z. Influence of halides on the dissolution and passivation behavior of AZ91D magnesium alloy in aqueous solutions[J].Electrochimica Acta, 2009, 54(5): 1545-1557.
【11】马颖, 徐卫军, 陈体军. 在镁合金表面生成微弧氧化陶瓷层的方法: 中国, 200610042990[P].2007-03-14.
【12】ARRABAL R, MATYKINA E, HASHIMOTO T, et al. Characterization of AC PEO coatings on magnesium alloys[J].Surface and Coatings Technology, 2009, 203(16): 2207-2220.
【13】马颖, 詹华, 马跃洲, 等. 电参数对AZ91D镁合金微弧氧化膜层微观结构及耐蚀性的影响[J].中国有色金属学报, 2010, 20(8): 1467-1473.
【14】曹楚南. 腐蚀电化学原理[M].北京: 化学工业出版社, 2004: 65-78.
【15】贺春林, 李凤琴, 刘常升, 等. SiCp /2024Al复合材料阳极氧化膜耐蚀性的电化学阻抗研究[J].金属学报, 2001, 37(8): 869-872.
【16】赵卫民, 王勇, 薛锦, 吴开源. 镍基合金涂层包覆钢腐蚀失效过程的电化学阻抗谱研究[J].金属学报, 2005, 41(2): 178-184.
【17】ARRABAL R, MATYKINA E, VIEJO F, et al. Corrosion resistance of WE43 and AZ91D magnesium alloys with phosphate PEO coatings[J].Corrosion Science, 2008, 50(6): 1744-1752.
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