耐热镁合金Mg-14Gd-2.3Zn-Zr的高温氧化行为研究  

High Temperature Oxidation Behavior of a Heat Resistant Magnesium Alloy Mg-14Gd-2.3Zn-Zr

作　　者：邵银华 王金龙[1] 张伟[2] 张甲[2] 李玲[1] 杜汐然 陈明辉[1] 朱圣龙[2] 王福会[1] SHAO Yinhua;WANG Jinlong;ZHANG Wei;ZHANG Jia;LI Ling;DU Xiran;CHEN Minghui;ZHU Shenglong;WANG Fuhui(Shenyang National Key Laboratory for Materials Science,Northeastern University,Shenyang 110819,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳材料科学国家研究中心东北大学联合研究分部,沈阳110819 [2]中国科学院金属研究所,沈阳110016

出　　处：《中国腐蚀与防护学报》2022年第1期73-78,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51801021和51671053);教育部中央高校基本科研业务费(N2102015);工信部项目(MJ-2017-J-99)。

摘　　要：研究了稀土耐热镁合金Mg-Gd-Zn-Zr在高温环境下的氧化行为,将Mg-14Gd-2.3Zn-Zr合金在200、300和440℃三组温度下进行恒温氧化实验,实验周期分别为20 h和50 min。采用X射线衍射仪、扫描电镜、扫描电镜能谱分析对镁合金表面氧化膜的微观形貌以及物相组成进行分析。研究结果显示,镁合金经高温氧化后,氧化膜的主要物相组成为MgO,且随着氧化温度的升高,合金表层Gd的含量逐渐增加。在440℃时,氧化膜内层中较为连续致密的Gd_(2)O_(3)薄膜阻止了合金中Mg^(2+)的进一步消耗,从而提高了镁合金的抗氧化性能。The oxidation behavior of a rare earth containing heat-resistant Mg-al oy Mg-14 Gd-2.3 Zn-Zr was studied in air for 20 h at 200 and 300 ℃, and for 50 min at 440 ℃, respectively. The surface morphology and phase composition of the oxide scales were characterized by means of XRD, SEM and EDS.The results show that the formed oxide scales were mainly composed of MgO. As the oxidation temperature increases, beneath the oxide scale, the Gd content in the surface of the substrate gradually increased. Of particular note is the formation of an intermediate layer of continuous and dense Gd_(2)O_(3) in between the oxide scale and substrate, which can prevent the further consumption of Mg^(2+)in the substrate alloy, thereby increasing the oxidation resistance of the Mg-alloy.

关 键 词：稀土耐热镁合金 氧化性能 氧化膜 

分 类 号：TG174[金属学及工艺—金属表面处理]