稀土盐Er(NO_(3))_(3)掺杂对纯镁微弧氧化膜层耐磨性的影响  

Effect of Er(NO_(3))_(3) addition on wear resistance of pure magnesium micro-arc oxide film layer

作　　者：司志伟 尹正宇 刘月 郭建福 迟尚吉 Si Zhiwei;Yin Zhengyu;Liu Yue;Guo Jianfu;Chi Shangji(School of Materials Science and Engineering,Jiamusi University,Jiamusi 154000,China)

机构地区：[1]佳木斯大学材料科学与工程学院,黑龙江佳木斯154000

出　　处：《电镀与精饰》2024年第3期59-65,共7页Plating & Finishing

摘　　要：针对纯镁耐磨性较差这一问题,通过微弧氧化(MAO)技术在Na2SiO_(3)-C10H14N2Na2O8电解液中对纯镁进行表面改性处理,旨在提高镁的耐磨性。在电解液中添加不同量的稀土盐Er(NO_(3))_(3),研究Er(NO_(3))_(3)添加量对纯镁微弧氧化膜层的相组成、微观结构、显微硬度、临界载荷以及摩擦系数的影响。结果表明,电解液中未添加Er(NO_(3))_(3)时,膜层中主要有Mg、MgO、Mg_(2)SiO_(3)和MgF_(2)相;电解液中添加Er(NO_(3))_(3)后,膜层中检测到Er_(2)O_(3)相。电解液中添加稀土盐Er(NO_(3))_(3)后,膜层表面的孔洞直径减小,当稀土盐Er(NO_(3))_(3)的添加量超过2.85 g/L时,膜层表面出现明显的裂纹。在电解液中添加稀土盐Er(NO_(3))_(3)后,经MAO处理得到膜层的显微硬度均高于未添加稀土盐Er(NO_(3))_(3),当稀土盐Er(NO_(3))_(3)的添加量为2.85 g/L时,膜层的显微硬度值最大,约为185.8±7.1 HV。膜层的临界载荷及摩擦系数随稀土盐Er(NO_(3))_(3)添加量的增加呈现先增加后减小的趋势,在稀土盐Er(NO_(3))_(3)的添加量为2.85 g/L时,膜层的临界载荷及摩擦系数分别约为12.2±0.5 N和0.15。In view of the poor wear resistance of pure magnesium,the surface modification of pure magnesium in Na2SiO_(3)-C10H14N2Na2O8 electrolyte by micro-arc oxidation(MAO)technology is carried out to improve the wear resistance of pure magnesium.Different amounts of rare earth salt Er(NO_(3))_(3) were added to the electrolyte to study the effects of Er(NO_(3))_(3) addition on the phase composition,micro‐structure,microhardness,critical load and friction coefficient of pure magnesium microarc oxide layer.The results showed that when Er(NO_(3))_(3) was not added to the electrolyte,there were mainly Mg,MgO,Mg_(2)SiO_(3) and MgF_(2) phases in the film layer,and Er_(2)O_(3) phases were detected in the film layer after Er(NO_(3))_(3) was added to the electrolyte.After the addition of rare earth salt Er(NO_(3))_(3) to the electrolyte,the diameter of the pores on the surface of the film layer decreased,and when the amount of rare earth salt Er(NO_(3))_(3) added exceeded 2.85 g/L,obvious cracks appeared on the surface of the film layer.After adding rare earth salt Er(NO_(3))_(3) to the electrolyte,the microhardness of the film layer obtained by MAO treatment was higher than that of the rare earth salt Er(NO_(3))_(3),and when the amount of rare earth salt Er(NO_(3))_(3) was 2.85 g/L,the microhardness value of the film layer was the largest,about 185.8±7.1 HV.The critical load and friction coefficient of the film layer increased first and then decreased with the increase of rare earth salt Er(NO_(3))_(3),and when the addition of rare earth salt Er(NO_(3))_(3) was 2.85 g/L,the critical load and friction coefficient of the film layer were about 12.2±0.5 N and 0.15.

关 键 词：纯镁 微弧氧化 稀土盐 耐磨性 

分 类 号：TQ153.6[化学工程—电化学工业]