LZ91合金板材微弧氧化复合膜层的腐蚀行为  

Corrosion Behavior of Micro-arc Oxidation Composite Coating on LZ91 Magnesium Alloy

作　　者：王润 王忠军[1] 林茹 刁爽 胡奉雅 李维娟[1] Wang Run;Wang Zhongjun;Lin Ru;Diao Shuang;Hu Fengya;Li Weijuan(School of Material and Metallurgy,University of Science and Technology Liaoning;State Key Laboratory of Metal Material for Marine Equipment and Application,Ansteel Group Corporation)

机构地区：[1]辽宁科技大学材料与冶金学院 [2]鞍山钢铁集团公司海洋装备用金属材料及其应用国家重点实验室

出　　处：《特种铸造及有色合金》2023年第12期1693-1699,共7页Special Casting & Nonferrous Alloys

基　　金：海洋装备用金属材料及其应用国家重点实验室-辽宁科技大学联合基金资助项目[HGSKL-USTLN(2020)05]。

摘　　要：在含有石墨烯电解液中对LZ91镁锂合金板材进行微弧氧化处理,获得微弧氧化(MAO)膜层,通过浸入法在MAO膜层上分别制备出双层导电膜层(MAO/CG)和三层防腐膜层(MAO/CG/AG)。利用金相显微镜和扫描电镜观察微观形貌,通过电化学工作站分析膜层腐蚀行为,利用霍尔效应测量膜层电导率。结果表明,当电解液中石墨烯浓度为1.0 g/L时,制备的MAO膜层腐蚀为0.13 mm/a;MAO/CG双层导电膜层的腐蚀速率为0.04 mm/a,霍尔效应电导率为7.89 S/cm;MAO/CG/AG三层防腐膜层的腐蚀速率为0.003 mm/a。LZ91 magnesium lithium alloy sheet was microarc oxided in graphene electrolyte to obtain MAO film layer.A double-layer conductive film(MAO/CG)and a triple-layer anti-corrosion film(MAO/CG/AG)were prepared on the MAO film layer by immersion method.The micro morphology was observed by metallographic microscopy and scanning electron microscopy,and the corrosion behaviour of the film layers was analyzed by electrochemical workstation,and the electrical conductivity of the film layers was measured using the Hall effect.The results reveal that the minimum corrosion rate of prepared MAO film layer is 0.13 mm/a when the concentration of graphene in the electrolyte is 1.0 g/L,while that of MAO/CG double-layer conductive film layer is 0.04 mm/a and the Hall effect conductivity is 7.89 S/cm.In addition,the MAO/CG/AG triple-layer anticorrosive film layer has corrosion rate of 0.003 mm/a.

关 键 词：镁锂合金 微弧氧化 石墨烯 复合膜层 耐蚀性 

分 类 号：TG178[金属学及工艺—金属表面处理] TG146.22[金属学及工艺—金属学]