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材料导报  2020, Vol. 34 Issue (10): 10088-10092    https://doi.org/10.11896/cldb.19040031
  金属与金属基复合材料 |
Nd、Y对AZ31镁合金热轧退火薄板耐蚀性的影响
李萧1, 胡水平1, 韩天棋2
1 北京科技大学工程技术研究院,北京 100083
2 北京市电子信息用新型钎焊材料工程技术研究中心,北京 100012
Effects of Nd, Y on Corrosion Resistibility of Hot-rolled and Annealed AZ31 Magnesium Alloy Thin Sheets
LI Xiao1, HU Shuiping1, HAN Tianqi2
1 Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
2 Beijing Engineering Technology Research Center of New Brazing Materials for Electronic Information, Beijing 100012, China
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摘要 为提高AZ31镁合金热轧退火薄板的耐蚀性,本实验在合金中分别添加单一Nd和复合Nd+Y稀土元素,采用盐雾腐蚀和电化学腐蚀实验方法对其耐蚀性展开研究,并利用扫描电镜(SEM)、X射线衍射(XRD)仪对合金和腐蚀产物的微观组织及结构进行观察分析。结果表明:添加稀土元素Nd、Y后,AZ31镁合金表面可形成更为耐蚀的含有稀土氧化物Nd2O3的腐蚀产物膜,提高对基体的保护作用;添加Nd、Y元素的AZ31镁合金中新的耐蚀相Al2Nd和Al2Y析出,有害相β-Mg17Al12减少,使合金自腐蚀电位正移,腐蚀电流密度减小,腐蚀速率减缓,耐蚀性明显提高;复合添加Nd+Y比单一添加Nd更有利于提高AZ31镁合金的耐蚀性,且添加量为0.5%Nd+0.5%Y时合金的耐蚀性能提高最为显著。
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李萧
胡水平
韩天棋
关键词:  AZ31变形镁合金  稀土元素  盐雾腐蚀  电化学腐蚀  耐腐蚀性能    
Abstract: To improve the corrosion resistibility of hot-rolled and annealed AZ31 magnesium alloy thin sheet, rare earth elements Nd and Y were added to commercial AZ31 magnesium alloy composition.The corrosion resistance was studied by salt spray corrosion and electrochemical corrosion experiments, and the microstructure and structure of the alloy and corrosion products were observed and analyzed by SEM and XRD.The results indicate that with addition of rare earth elements (Nd, Y), corrosion resistant oxides Nd2O3 was formed on the surface of the AZ31 Mg alloy to protect the substrate; addition of Nd and Y elements resulted in positive offset of corrosion potential and decreas of corrosion density, which retardsed the speed of corrosion and therefore improved the alloy's corrosion resistance attributed to the new corrosion resistant precipitation Al2Nd and Al2Y; comparing with only adding Nd element, addition of Nd+Y elements can further improve AZ31 alloy's corrosion resistance, among the matrix of different weight percentages, 0.5%Nd+0.5%Y was proved to be the optimized formula.
Key words:  AZ31 wrought magnesium alloy    rare earth element    salt spray corrosion    electrochemical corrosion    corrosion resistance
                    发布日期:  2020-04-26
ZTFLH:  TG146.22  
基金资助: 国家“十三五”重点研发计划资助项目(2016YFB0700300)
通讯作者:  胡水平,北京科技大学,副研究员。1992年毕业于北京科技大学,获得硕士学位,2008年获得博士学位。主要研究方向是金属材料的成形及热处理工艺、机电液一体化,负责及参加了几十项国家、厂校合作课题。发表学术论文50余篇,获发明专利15项、中国有色行业协会一等奖1项、中国金属行业协会二等奖1项。husp@nercar.ustb.edu.cn   
作者简介:  李萧,北京科技大学,工程师。2010年1月毕业于北京科技大学,获得材料学专业博士学位。2010年4月—2012年9月进入北京科技大学博士后流动站工作。同年加入北京科技大学工程技术研究院实验中心工作至今,主要从事材料微观组织、结构和取向(织构)的表征与分析等方面的研究工作。在国内外学术期刊上发表论文16篇,授权专利1项。
引用本文:    
李萧, 胡水平, 韩天棋. Nd、Y对AZ31镁合金热轧退火薄板耐蚀性的影响[J]. 材料导报, 2020, 34(10): 10088-10092.
LI Xiao, HU Shuiping, HAN Tianqi. Effects of Nd, Y on Corrosion Resistibility of Hot-rolled and Annealed AZ31 Magnesium Alloy Thin Sheets. Materials Reports, 2020, 34(10): 10088-10092.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.19040031  或          http://www.mater-rep.com/CN/Y2020/V34/I10/10088
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