无机缓蚀剂改性的等离子电解氧化膜层的耐蚀性和自修复的研究  

Study of Corrosion Resistance and Self-Healing of Plasma Electrolytic Oxide Film Layers Modified by Inorganic Corrosion Inhibitors

作　　者：贺胤翔 王晨 He Yinxiang;Wang Chen(School of Materials and Chemical Engineering,Xian University of Technology,Xian 710000,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710000

出　　处：《广东化工》2023年第8期41-45,20,共6页Guangdong Chemical Industry

摘　　要：为解决镁合金等离子电解氧化膜层(PEO)在使用过程中破损导致镁合金试样加速失效的问题,本文以AZ91D镁合金为研究对象,将镁合金PEO试样放置放入装有无机缓蚀剂的真空皿当中,采用真空浸渍的方法对PEO膜层进行改性。通过采用扫描电镜(SEM)、X射线衍射(XRD)、电化学和微区电化学的手段研究无机缓蚀剂偏钒酸钠(NaVO_(3))对PEO膜层的组织性能的影响。结果表明:经过偏钒酸钠改性后的PEO膜层微孔中呈现出片状的钒酸盐组织,改性后的PEO试样腐蚀电位(E_(corr))正移,腐蚀电流(I_(corr))下降两个数量级。当膜层破损,微孔之中的无机缓蚀剂对破损处进行修补,修补后的划痕与膜层之间的电势差从0.44 V降低至0.186 V,划痕的自修复率达到42.27%。In order to solve the problem that the plasma electrolytic oxide(PEO)layer of magnesium alloy breaks down during use and leads to the accelerated failure of magnesium alloy specimens,this paper takes AZ91D magnesium alloy as the research object,places the PEO specimens of magnesium alloy into the vacuum dish with inorganic corrosion inhibitor,and uses the vacuum impregnation method to modify the PEO film layer.The effect of the inorganic corrosion inhibitor sodium metavanadate(NaVO_(3))on the PEO film properties was investigated by scanning electron microscopy(SEM),X-ray diffraction(XRD),electrochemistry and microzone electrochemistry.The results showed that the PEO film layer modified by sodium metavanadate showed a lamellar vanadate organization in the micropores,and the corrosion potential(E_(corr))of the modified PEO specimens was positively shifted and the corrosion current(I_(corr))decreased by two orders of magnitude.When the film layer was broken,the inorganic corrosion inhibitor in the micropores repaired the breakage,and the potential difference between the repaired scratch and the film layer was reduced from 0.44 V to 0.186 V.The self-repair rate of the scratch reached 42.27%.

关 键 词：AZ91D镁合金 缓蚀剂 自修复 PEO 腐蚀 

分 类 号：TG178[金属学及工艺—金属表面处理]