Mn含量对梯度多孔Mg-Mn合金微弧氧化膜组织与性能的影响  

Effect of Mn content on microstructure and properties of micro-arc oxidation film of gradient porous Mg-Mn alloy

作　　者：于景媛[1] 王建中[1] 李强[1] 张峰峰[1] 孙旭东[2] 

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]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《材料热处理学报》2015年第4期179-184,共6页Transactions of Materials and Heat Treatment

基　　金：国家"863"计划项目(2011AA060102);辽宁省自然科学基金(2014020111);辽宁省高等学校杰出青年学者成长计划(LJQ2013067);辽宁省高等学校创新团队项目(LT2013014);辽宁省重点实验室基础研究项目(LZ2014031)

摘　　要：研究了Mn含量对梯度多孔Mg-Mn合金微弧氧化过程中电压-时间曲线、微弧氧化膜层显微组织、膜层厚度、物相组成以及耐腐蚀性能的影响。结果表明,随Mn元素含量的增加,微弧氧化电压-时间曲线中的起始电压U1、击穿电压U2和稳定电压U3均下降,但是当Mn含量超过2%后,U1、U2、U3均上升,随着Mn元素含量的增加,微弧氧化膜层厚度先降低而后增加。当Mn含量为2%时,梯度多孔Mg-Mn合金表面形成的氧化膜质量最好,孔隙细小、分布均匀,膜层厚度为39.6μm。结合XRD和EDS分析表明,微弧氧化处理后试样表面膜层由Mg2Si O4和Mg O两相组成。随着在模拟体液中浸泡时间的延长,添加2%Mn元素的梯度多孔Mg-Mn合金的质量损失最少,析氢量最低,耐腐蚀性最佳。The effect of Mn content on voltage-time curves during micro-arc oxidation process, microstructure, thickness, phase composition and corrosion resistance of the oxidation films on Mg-Mn alloy surface was studied. The results show with increase of Mn content,initial voltage( U1),breakdown voltage( U2),stable voltage( U3) also decrease,but they all increase when Mn content is beyond 2%. With the increase of Mn content,the thickness of oxidation layers first decrease and then increase. The oxidation films of the thickness of 39. 5 μm have fine and uniform pores and best quality with the addition of 2% Mn. XRD and EDS analysis show there are Mg O and Mg2 Si O4phases in the oxidation films. Corrosion resistance measurement shows the amount of hydrogen evolution and mass loss are lower for the gradient porous Mg-2% Mn alloys with the increase of immersing time. The corrosion resistance of gradient porous Mg-2%Mn alloys is the best.

关 键 词：梯度多孔Mg合金 MN含量 微弧氧化 膜层特性 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]