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铸态Mg-xAl(x=9%,12%,15%)合金的组织结构及腐蚀行为

Microstructure and Corrosion Behavior of the As-cast Mg-xAl(x=9%,12%,15%) Alloys

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【作者】 郭艳萍王亚宁王全乐董兆博王琳房大庆刘宝胜

【Author】 Guo Yanping;Wang Yaning;Wang Quanle;Dong Zhaobo;Wang Lin;Fang Daqing;Liu Baosheng;College of Materials Science and Engineering, Taiyuan University of Science and Technology;Engineering Research Center for Magnesium Alloys of Shanxi Province,Taiyuan University of Science and Technology;

【机构】 太原科技大学材料科学与工程学院太原科技大学山西省镁及镁合金工程技术研究中心

【摘要】 通过半连续铸造的方法制备了Mg-xAl(x=9%,12%,15%)合金。采用XRD、OM和SEM分析研究了Al含量对铸态Mg-Al合金的组织结构变化的影响。同时,利用浸泡腐蚀实验和动电位电化学极化曲线研究了Mg-xAl合金的耐蚀行为。最后,通过SEM观察去除腐蚀产物后样品表面形貌,研究了其腐蚀机理。结果表明:3种合金材料的组织都是由α-Mg相和β-Mg17Al12相组成,而且β相含量随着Al含量的增多而增多。3种合金中随β相的增多,合金的耐腐蚀性能逐渐增强,即Mg-15%Al合金的耐腐蚀性能最好,Mg-9%Al的最差。铸态Mg-Al合金在3.5%NaCl溶液中浸泡72 h后,表面都可以形成氧化膜,随着Al含量增高,膜层的稳定性增强。

【Abstract】 Mg-xAl(x=9%, 12%, 15%, mass fraction) alloys were prepared by semi-continuous casting. The effects of Al contents on microstructure evolution of Mg-Al alloy were investigated using X-ray diffraction(XRD), optical microscopy(OM) and scanning electron microscopy(SEM). Meanwhile, the corrosion behaviors of the Mg-xAl alloys were studied by both hydrogen evolution and potentiodynamic polarization curves. Moreover, the corrosion mechanism of Mg-xAl alloys was also discussed based on the SEM corrosion morphologies of as-cast Mg-Al alloys after hydrogen evolution testing for 72 h in 3.5% NaCl without corrosion products. The results indicate that the microstructure of the three alloys is composed of α-Mg phase and β-Mg17Al12 phase. Moreover, the content of β phase increases with the increase of Al content. As a result, the corrosion resistance of the three alloys is enhanced with the increase of the β phase. The Mg-15%Al alloy has the best corrosion resistance, while Mg-9%Al has the worst. The oxide film forms on the surface of all the as-cast Mg-Al alloys after hydrogen evolution testing for 72 h in 3.5% NaCl. Furthermore, the stability of the film increases with the increase of Al content.

【基金】 山西省自然科学基金(201701D121041);山西省高校科技创新项目(2017159);山西省重点学科建设经费;山西省重点研发计划(重点)项目(201603D111004)
  • 【文献出处】 稀有金属材料与工程 ,Rare Metal Materials and Engineering , 编辑部邮箱 ,2018年08期
  • 【分类号】TG146.22
  • 【被引频次】4
  • 【下载频次】121
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