王玉娇,张韵,江海涛,于博文.Ca、Y改性的Mg-2Zn-1Al镁合金腐蚀行为[J].稀有金属材料与工程,2022,51(8):2777~2784.[Yujiao Wang,Yun Zhang,Haitao Jiang,Bowen Yu.Corrosion Behavior of Ca and Y Micro-alloyed Mg-2Zn-1Al Alloy[J].Rare Metal Materials and Engineering,2022,51(8):2777~2784.]
Ca、Y改性的Mg-2Zn-1Al镁合金腐蚀行为
投稿时间:2021-07-02  修订日期:2021-08-26
中文关键词:  Ca  腐蚀行为  微观组织  Y  ZA21
基金项目:中央高校基本科研业务费(FRF-IC-20-10)
中文摘要:
      采用扫描电镜、XRD、析氢及电化学测试等对0.2%Ca、0.2%Y改性的Mg-2Zn-1Al (ZA21)轧制板材的微观组织和腐蚀行为进行了分析。结果表明,Ca和Y细化了晶粒,改变了第二相类型,降低了含Mn相中锰含量。在3.5%NaCl溶液中,优先腐蚀位点位于含Mn相附近的镁基体上,12 h腐蚀速率满足:ZA21 (8.59 mm/a)>ZA21+0.2%Ca (7.17 mm/a)>ZA21+0.2%Y (4.22 mm/a)>ZA21+0.2%Ca+0.2%Y (1.26 mm/a)。耐蚀性提升可归因于晶粒的细化;高Mn相消失,低Mn相和无Mn相生成导致微电偶腐蚀减弱;Mg、 Mg(OH)2、Ca3Al2O6·xH2O、CaY4O7和Y2O3组成的更致密、裂纹更浅、保护性更强的腐蚀产物膜替代了由Mg和Mg(OH)2组成的充满裂纹、保护作用有限的腐蚀产物膜。
Corrosion Behavior of Ca and Y Micro-alloyed Mg-2Zn-1Al Alloy
英文关键词:Ca  corrosion behavior  microstructure  Y  ZA21
英文摘要:
      Microstructure and corrosion behavior of 0.2wt% Ca and/or 0.2wt% Y modified Mg-2Zn-1Al (ZA21) rolled sheets were analyzed by SEM, XRD, hydrogen evolution and electrochemical measurement. Results show that Ca and Y refine the grains, modify the second phases, and reduce the Mn content in Mn-containing phase. In 3.5wt% NaCl solution, the preferential corrosion sites locate at the Mg-matrix near Mn-containing phases. The 12 h-corrosion rates satisfy ZA21 (8.59 mm/a)>ZA21+0.2Ca (7.17 mm/a)>ZA21+0.2Y (4.22 mm/a)>ZA21+0.2Ca+0.2Y (1.26 mm/a). The enhanced corrosion resistance of the Ca, Y modified alloys can be accredited to the follows: (1) the refinement of grain size; (2) the devitalization of the intensity of the micro-galvanic corrosion by generating low-Mn and non-Mn phases rather than the high Mn-content phases; (3) the dense, shallower cracked and more protective corrosion product film composed of Mg, Mg(OH)2, Al2O3, Ca-containing and Y-containing components replaces the fully-cracked and limited protective one without Ca, Y incorperation.
作者单位E-mail
王玉娇 北京科技大学 wangyujiao_2018@126.com 
张韵 北京科技大学  
江海涛 北京科技大学  
于博文 北京科技大学  
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