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Improvement of corrosion resistance of Mg by rare earth elements〜Development of low nvironmental-burden material and investigation into mechanism

利用稀土元素提高镁的耐蚀性〜低环境负荷材料的开发及机理研究

基本信息

批准号：
18560714
负责人：
TAKENAKA Toshihide
金额：
$ 2.42万
依托单位：
Toyohashi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560714/
关键词：
magnesium rare earth element corrosion surface treatment chemical conversion anodization molten salt co-denosition

项目摘要

Surface oxide film containing rare earth elements(REs)was formed on Mg materials by chemical conversion and anodization to improve their corrosion resistance. Analysis of the film was carried out and the corrosion resistance against salt water was examined. Co-deposition of REs with magnesium metal in molten salt electrolysis was also studied in this study, and the influence of REs on the electrolysis efficiency was discussed.The corrosion resistance of common magnesium alloys, such as AZ31, AZ61, AZ91 and AM60, was particularly improved by chemical conversion coating in solution containing both magnesium nitrate and RE nitrates, and the suitable coating condition for each alloy was clarified. The results from XRD, EPMA and XPS analyses indicated that the surface film consisted of complex oxides of magnesium and RE, and that the improvement of the corrosion resistance was affected by the distribution of the elements in the film.Oxide film was formed on Mg alloy by anodization in solution containing RE nitrate. The corrosion resistance was bettered consequently, but particular results by the treatment with both magnesium and REs was hardly seen.Magnesium metal containing REs was directly electrodeposited in a molten MgCl_2-NaCl-CaCl_2 bath with RECl_3.The morphology of the deposit strongly depended on the co-deposition of RE, and the electrochemical responses were remarkably changed. These results suggested a possibility that the electrolysis efficiency of magnesium deposition was improved by the co-deposition of REs

为了提高镁材料的耐蚀性，采用化学转化和阳极氧化的方法在镁材料表面形成含稀土元素的氧化膜。对膜进行了分析，并检查了对盐水的耐腐蚀性。本文还研究了稀土与镁合金在熔盐电解中的共沉积，讨论了稀土对电解效率的影响，特别是在含有硝酸镁和稀土硝酸盐的电解液中，通过化学转化膜提高了常用镁合金AZ 31、AZ 61、AZ 91和AM 60的耐蚀性，并明确了各合金的适宜镀覆条件。XRD、EPMA和XPS分析结果表明，镁合金表面氧化膜由镁和稀土的复合氧化物组成，其耐蚀性的提高与膜中元素的分布有关。在含稀土的MgCl_2-NaCl-CaCl_2熔盐体系中直接电沉积含稀土的镁合金，发现稀土的共沉积对存款的形貌有很大的影响，并显著改变了镁合金的电化学响应。这些结果表明，稀土的共沉积有可能提高镁沉积的电解效率