复合添加Sn和Mn对AZ21合金微弧氧化涂层组织和性能的影响  

Effect of Sn and Mn Composite Addition on Microstructure and Properties of Micro-arc Oxidation Coating on AZ21 Alloy

作　　者：高付豪 吕滨江 郭峰[1,2] 崔宁 徐铁伟[1] Gao Fuhao;Lv Binjiang;Guo Feng;Cui Ning;Xu Tiewei(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China;Key Lab of Industrial Fluid Energy Conservation and Pollution Control,Ministry of Education,Qingdao University of Technology,Qingdao 266520,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,山东青岛266520 [2]青岛理工大学工业流体节能与污染控制教育部重点实验室,山东青岛266520

出　　处：《稀有金属材料与工程》2025年第1期171-183,共13页Rare Metal Materials and Engineering

基　　金：山东省自然科学基金面上项目(ZR2023ME159)。

摘　　要：以挤压态Mg-2Al-Zn(AZ21)合金为研究对象,研究了在基体中少量复合添加低成本Sn(1%,质量分数)和Mn(0.5%,质量分数)元素对AZ21合金微弧氧化涂层组织和性能的影响。在基体中复合添加Sn和Mn元素后,并未改变涂层中相的构成,涂层中主要为MgO、MgAl_(2)O_(4)和AlPO_(4)相;涂层厚度和孔隙率稍有增加,厚度由8.49μm增加到9.60μm,孔隙率由5.05%增加到5.75%。通过干摩擦磨损实验、浸泡实验和电化学测试分别评估了基体和涂层的耐磨性和耐蚀性。结果表明,微弧氧化涂层明显改善了基体的耐磨性和耐蚀性。Sn和Mn的复合添加改善了涂层的耐磨性,但其涂层的耐蚀性有所下降,涂层的磨损率由3.53×10^(-5)mm^(3)·(N·m)^(-1)减小到2.993×10^(-5)mm^(3)·(N·m)^(-1),涂层的腐蚀电流密度由3.14×10^(-6)A·cm^(-2)增加到4.18×10^(-6)A·cm^(-2)。The effects of low-cost Sn(1wt%)and Mn(0.5wt%)composite addition on the microstructure and properties of micro-arc oxidation coatings on extruded Mg-2Al-Zn(AZ21)alloy were studied.After the addition of Sn and Mn elements to the substrate,the phase composition of the coatings remains unchanged,mainly consisting of MgO,MgAl_(2)O_(4) and AlPO_(4) phases.The thickness and porosity of the coatings increase slightly,the thickness increases from 8.49μm to 9.60μm,and the porosity increases from 5.05%to 5.75%.The wear resistance and corrosion resistance of the substrates and coatings were evaluated by dry friction and wear test,immersion test and potentiodynamic polarization test.The results show that the micro-arc oxidation coating significantly improves the wear resistance and corrosion resistance of the substrate.The composite addition of Sn and Mn improves the wear resistance of the coatings,but their corrosion resistance decreases.The wear rate of the coating decreases from 3.53×10^(-5)mm^(3)·(N·m)^(-1)to 2.993×10^(-5)mm^(3)·(N·m)^(-1).The corrosion current density of the coating increases from 3.14×10^(-6)A·cm^(-2)to 4.18×10^(-6)A·cm^(-2).

关 键 词：微弧氧化涂层 Sn和Mn复合添加 耐磨性 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG146.22[金属学及工艺—金属学]