| Properties of dawsonite conversion film on AZ31 magnesium alloy | |
| J. Chen; Y. W. Song; D. Y. Shan; E. H. Han | |
| 2011 | |
| 发表期刊 | Transactions of Nonferrous Metals Society of China
 |
| ISSN | 1003-6326 |
| 卷号 | 21期号:4页码:936-942 |
| 摘要 | An environmentally friendly method for synthesizing a dawsonite conversion film was developed to improve the corrosion resistance of AZ31 Mg alloy. The film was prepared by two steps: the AZ31 alloy was first immersed in an Al(2)(SO(4))(3) solution venting CO(2) gas to form a precursor film, and then the precursor film was treated in a Na(2)CO(3) solution dissolved with Al to obtain the dawsonite film. The surface morphology of the conversion film was observed with an environmental scanning electronic microscope. The chemical composition of the conversion film was analyzed by energy dispersive X-ray spectroscopy and X-ray diffractometry. Electrochemical and immersion tests were carried out to evaluate the protection effect of the conversion film on AZ31 alloy. There are some network-like cracks on the surface of the film. The conversion film is mainly composed of dawsonite NaAlCO(3)(OH)(2), Al(OH)(3) and Al(5)(OH)(13)(CO(3))center dot 5H(2)O, which can increase the corrosion potential and reduce the corrosion current density of the Mg substrate. After immersion tests, the film almost keeps intact, except for the localized narrow areas with several corrosion pits, while the bare material undergoes serious general corrosion. It is indicated that the dawsonite film can provide good protection to the magnesium alloy. |
| 部门归属 | [chen jun; song ying-wei; shan da-yong; han en-hou] chinese acad sci, inst met res, key lab corros & protect, shenyang 110016, peoples r china.;song, yw (reprint author), chinese acad sci, inst met res, key lab corros & protect, shenyang 110016, peoples r china;ywsong@imr.ac.cn |
| 关键词 | Magnesium Alloy Dawsonite Conversion Film Corrosion Corrosion Protection Formation Mechanism Pure Magnesium Coatings Az91 Resistance Stannate Behavior |
| URL | 查看原文 |
| WOS记录号 | WOS:000290515800036 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.imr.ac.cn/handle/321006/30258 |
| 专题 | 中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | J. Chen,Y. W. Song,D. Y. Shan,et al. Properties of dawsonite conversion film on AZ31 magnesium alloy[J]. Transactions of Nonferrous Metals Society of China,2011,21(4):936-942. |
| APA | J. Chen,Y. W. Song,D. Y. Shan,&E. H. Han.(2011).Properties of dawsonite conversion film on AZ31 magnesium alloy.Transactions of Nonferrous Metals Society of China,21(4),936-942. |
| MLA | J. Chen,et al."Properties of dawsonite conversion film on AZ31 magnesium alloy".Transactions of Nonferrous Metals Society of China 21.4(2011):936-942. |
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