In Situ Growth Process of Mg-Al Hydrotalcite Conversion Film on AZ31 Mg Alloy

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	In Situ Growth Process of Mg-Al Hydrotalcite Conversion Film on AZ31 Mg Alloy
	J.; Song Chen, Y. W.; Shan, D. Y.; Han, E. H.
	2015
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	31 期号:4 页码:384-390
摘要	In this study, an environment-friendly hydrotalcite film has been deposited on AZ31 Mg alloy by a two-step technique. To improve conversion film technique and control film properties, batch studies have been carried out to address various process parameters such as immersion time, pH value, and temperature of the treatment solution. The morphologies and chemical composition were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The corrosion resistance of the samples with the various final films was then further compared by polarization curves. It can be concluded from the results that, at low value of pH, temperature, or long deposition time, the precursor film is mainly composed of a cracked layer. The transformation of hydrotalcite film is largely influenced by the pH value. There are optimum values of pH, temperature of the coating bath and immersion time for the film formation process to achieve the best quality and corrosion resistance of the hydrotalcite film. The optimum process is as follows: the sample is first immersed in the pretreatment solution with a pH value of about 8 at a temperature of 60 degrees C for 30 min to form a precursor film and then this precursor film is immersed into the post treatment solution with a pH of 10.5 at 80 degrees C for 1.5 h to obtain the Mg-Al hydrotalcite conversion film. Copyright (C) 2015, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited. All rights reserved.
部门归属	[chen, jun] xihua univ, ctr adv mat & energy, chengdu 610039, peoples r china. [chen, jun ; song, yingwei ; shan, dayong ; han, en-hou] chinese acad sci, inst met res, environm corros ctr, shenyang 110016, peoples r china. ; chen, j (reprint author), xihua univ, ctr adv mat & energy, chengdu 610039, peoples r china. ; chenjun_812@163.com
关键词	Magnesium Alloy Film Corrosion Parameter Optimization Corrosion-resistance Magnesium Coatings Protection
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73768
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J.,Song Chen, Y. W.,Shan, D. Y.,et al. In Situ Growth Process of Mg-Al Hydrotalcite Conversion Film on AZ31 Mg Alloy[J]. Journal of Materials Science & Technology,2015,31(4):384-390.
APA	J.,Song Chen, Y. W.,Shan, D. Y.,&Han, E. H..(2015).In Situ Growth Process of Mg-Al Hydrotalcite Conversion Film on AZ31 Mg Alloy.Journal of Materials Science & Technology,31(4),384-390.
MLA	J.,et al."In Situ Growth Process of Mg-Al Hydrotalcite Conversion Film on AZ31 Mg Alloy".Journal of Materials Science & Technology 31.4(2015):384-390.