电流模式对Mg-Zn-Ca镁合金微弧氧化涂层孔隙及耐腐蚀性的影响  

Effects of Current Mode on Porosity and Corrosion Resistance of Micro-arc Oxidation Ceramic Coating on Mg-Zn-Ca Magnesium Alloy

作　　者：汤晓刚[1] 张莉[1] 陈磊 TANGXiaogang;ZHANGLi;CHENLei(Anhui Huadian Engineering Consultating&Design Co.,Ltd.,Hefei 230022,China;Hefei Innovation Research Institute,Beihang University,Hefei 230012,China)

机构地区：[1]安徽华电工程咨询设计有限公司,安徽合肥230022 [2]北京航空航天大学合肥创新研究院,安徽合肥230012

出　　处：《热加工工艺》2024年第14期42-46,共5页Hot Working Technology

摘　　要：分别采用单极、双极和混合电流模式在Mg-Zn-Ca合金基板上制备3种微弧氧化涂层。通过扫描电镜(SEM)和三维激光扫描共聚焦显微镜测量了涂层的孔隙尺寸、表面形貌和表面粗糙度,涂层的物相结构采用X射线衍射仪进行表征,应用电化学工作站和500 h的盐雾腐蚀对3种涂层进行耐腐蚀性研究。结果表明:3种涂层均主要由MgO、Mg_(2)SiO_(4)、Mg_(2)SiO_(3)相组成,混合电流模式下得到的涂层表面光洁度更好,表面气孔尺寸达到(5.52±0.63)μm;同时较小的孔隙形成了屏障阻隔效应,使其耐蚀性高于单极和双极模式涂层的。Three kinds of micro-arc oxidation coatings were prepared on Mg-Zn-Ca alloy substrate by using unipolar,bipolar and hybrid mode.The surface pore and surface morphology of the coating were measured by scanning electron microscope and 3D laser scanning confocal microscope,respectively.X-ray diffractometer was used to analyze the phase structure of the coating.The corrosion resistance of three kinds of coatings was studied by electrochemical workstation and 500h salt spray corrosion experiment.The results show that the three coatings are mainly composed of MgO,Mg_(2)SiO_(4)and Mg_(2)SiO_(3)phases.The coating obtained under hybrid mode has better surface finish and the size of surface pore is(5.52±0.63)μm.Besides,the low porosity has a barrier effect,which makes the coating has a better corrosion resistance than those in unipolar and bipolar modes.

关 键 词：镁合金 微弧氧化 陶瓷层 耐腐蚀性 孔隙率 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG174.3[金属学及工艺—金属学]