Ag含量对多孔Mg-Ag合金微弧氧化膜组织及耐腐蚀性能的影响  

Effects of Ag Content on Microstructure and Corrosion Resistance of Micro-arc Oxidation Film of Porous Mg-Ag Alloys

作　　者：李强[1] 赵特 李晓爽 于景媛[1] 于海波 陈明华[1] 孙旭东[2] LI Qiang;ZHAO Te;LI Xiaoshuang;YU Jingyuan;YU Haibo;CHEN Minghua;SUN Xudong(College of Materials Science&Engineering,Liaoning University of Technology,Jinzhou 121001,China;School of Materials Science&Engineering,Northeastern University,Shenyang 110004,China)

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121001 [2]东北大学材料科学与工程学院,辽宁沈阳110004

出　　处：《热加工工艺》2021年第10期95-99,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51805236);辽宁省自然科学基金-辽宁工业大学联合基金资助项目(201602378);辽宁省教育厅基础研究项目(JJL201915407)。

摘　　要：采用微弧氧化法在Na2SiO3系电解液中对多孔Mg-Ag合金进行改性处理,研究了Ag含量对多孔Mg-Ag合金微弧氧化电压的影响,研究了微弧氧化后多孔Mg-Ag合金氧化膜层的显微组织、物相组成以及耐腐蚀性。结果表明:当Ag含量在0~4 wt%时,随着Ag含量的增加,微弧氧化电压和多孔Mg-Ag合金表面氧化膜厚度均出现先减小而后增加的现象。在3A的电流下氧化2 min后,多孔Mg-3Ag合金表面的氧化膜层厚度为41.5μm,此时氧化膜质量最优。经微弧氧化处理后,多孔Mg-3Ag合金自腐蚀电位最大(-1.3289 V),腐蚀电流密度最小(2.3991×10^(-4)A·cm^(-2))。在模拟体液中浸泡20 d后,微弧氧化后多孔Mg-3Ag合金样品失重最少,这表明在多孔Mg基体中添加适量的Ag元素可提高多孔Mg合金微弧氧化膜层的耐腐蚀性。The porous Mg-Ag alloys were modified in Na2SiO3 electrolytes by micro-arc oxidation method. The influence of Ag content on the micro-arc oxidation voltages was studied. The microstructure, phase composition and corrosion resistance of the oxidation film of the porous Mg-Ag alloys after micro-arc oxidation were analyzed. The results show that the voltages and oxidated film thickness of the porous Mg-Ag alloys first decrease and then increase by increasing Ag content in0-4 wt%. The film thickness of the porous Mg-3 Ag alloy is 41.5 μm and the oxidation coating quality is optimal when the sample is oxidated at the current of 3 A for 2 min. The porous Mg-3 Ag alloy has the biggest self-corrosion potentials(-1.3289 V) and the smallest passivation current density(2.3991×10^(-4)A·cm^(-2)) after micro-arc oxidation. When immersed in SBF solution for 20 d, the porous Mg-3 Ag alloy has the lest mass loss, which shows that the corrosion resistance of the micro-arc oxidation film of the porous Mg alloys improves with the addition of Ag element in porous Mg matrix.

关 键 词：多孔Mg-Ag合金 Ag含量 微弧氧化 耐腐蚀性 

分 类 号：TG174.45[金属学及工艺—金属表面处理]