Role of CO2 in the initial stage of atmospheric corrosion of AZ91 magnesium alloy in the presence of NaCl

稀有金属（英文版）, 2006, 25(2): 190-196.

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1.Department of Material Science and Technology, Nanchang Institute of Aeronautical Technology, Nanchang 330034, China;Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

2.Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China

基金项目: 科技部科研项目(19990650) Materials Science and Engineering Research Center Project of Jiangxi Province of China(ZX200401015)

Role of CO2 in the initial stage of atmospheric corrosion of AZ91 magnesium alloy in the presence of NaCl

Keywords： materials science

The effect of CO2 and NaCl on the initial stage of atmospheric corrosion of AZ91 magnesium alloy was studied.The observation of surface morphology by optical microscopy (OM), scanning electron microscopy (SEM) and the analysis of corrosion products by X-ray diffraction (XRD) were integrated to investigate corrosion evolution. The results showed that NaCl stimulated the corrosion by promoting the formation of thin electrolyte film, increasing the conductivity and breaking the protective film in the absence of CO2. The morphology of the corroded samples with deposited NaCl was more homogenous in the presence of CO2. It was suggested that NaCl-induced corrosion was inhibited in the presence of CO2 by the formation of slightly soluble corrosion products containing hydroxy carbonates and hydroxy chlorides that provided a partly protective layer on the surface of the magnesium alloy.

参考文献

[1]	Song G L;Andrej A;Matthew D .Influence of microstructure on the corrosion of diecast AZ91D[J].Corrosion Science,1999,41:249.
[2]	Ambat R;Aung N N;Zhou W .Evaluation of microstructural effects on corrosion behavior of AZ91D magnesium alloy[J].Corrosion Science,2000,42:1433.
[3]	Song G L;Andrej A;Wu X L;Zhang B .Corrosion behavior of AZ21,AZS01 and AZ91 1N sodium chloride[J].Corrosion Science,1998,40(10):1769.
[4]	Wu Z N;Li P J;Liu S X;Zeng D B .Present state of research on corrosion of magnesium alloys[J].Foundry Res,2001,50:583.
[5]	许越,陈湘,吕祖舜,周德瑞,赵连城.镁合金表面的腐蚀特性及其防护技术[J].哈尔滨工业大学学报,2001(06):753-757.
[6]	Thorne N A;Jugnet Y;Reboul M;Dunlop H .Comparison of the natural oxide films on Mg and its alloys[J].Surface and Interface Analysis,1990,16:315.
[7]	Makar G L;Kruger J .Corrosion studies of rapidly solidified magnesium alloys[J].Journal of Electrochem Sci,1990,137(02):414.
[8]	Ghali E.; .Corrosion and Protection of Magnesium Alloys[J].Materials Science Forum,2000(0):261-272.
[9]	R. Lindstrom;J.-E. Svensson;L.-G. Johansson .The Influence of Carbon Dioxide on the Atmospheric Corrosion of Some Magnesium Alloys in the Presence of NaCl[J].Journal of the Electrochemical Society,2002(4):B103-B107.
[10]	Xuzhen Y;Wu Y.Electrochemical Thermodynamics of Metal Corrosion:Potential-pH Diagram and Its Application[M].北京:化学工业出版社,1991:10.

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Role of CO2 in the initial stage of atmospheric corrosion of AZ91 magnesium alloy in the presence of NaCl

参考文献