电解液中Na2CO3/C6H12O6对AZ31镁合金阳极氧化膜结构与耐腐蚀性能的影响  

Effect of Na2CO3/C6H12O6 in Electrolyte on Microstructure and Corrosion Resistance of AZ31 Magnesium Alloy Anodized Film

作　　者：张锋刚[1] 宋佩维[1] 王永善[1] ZHANG Fenggang;SONG Peiwei;WANG Yongshan(School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723001,China)

机构地区：[1]陕西理工大学材料科学与工程学院,汉中723001

出　　处：《机械工程材料》2020年第3期13-17,共5页Materials For Mechanical Engineering

基　　金：陕西省自然科学基础研究计划项目(2018JM5021,2018JQ5170);陕西省教育厅专项科研计划项目(19JK0183);2017年陕西省创新创业学院子项目。

摘　　要：在添加不同含量Na2CO3和C6H12O6的NaOH-Na2SiO3-Na2B4O7基础电解液中,对AZ31镁合金进行直流阳极氧化处理,研究了镁合金阳极氧化膜的微观结构以及在中性盐雾中的耐腐蚀性能。结果表明:镁合金阳极氧化膜主要由MgO相和Mg2SiO4相组成;电解液中添加Na2CO3和C6H12O6后,阳极氧化膜表面微孔分布均匀且尺寸减小,阳极氧化膜厚度增加;当Na2CO3质量浓度由10g·L^-1增加到30g·L^-1时,微孔尺寸增大,氧化膜厚度减小;当C6H12O6质量浓度由5g·L^-1增加到15g·L^-1时,微孔尺寸减小,阳极氧化膜厚度增加;镁合金阳极氧化膜的主要腐蚀形式为点蚀,呈河流状花样分布;电解液中添加10g·L^-1 Na2CO3时,阳极氧化膜表面微孔最细小,孔径为1~3μm,阳极氧化膜厚度达16μm,阳极氧化膜具有较好的耐腐蚀性能。After adding different content of Na2CO3 and C6H12O6 into NaOH-Na2SiO3-Na2B4O7 basic electrolyte,AZ31 magnesium alloy was treated by direct current anodizing and then the microstructure and corrosion resistance in neutral salt spray of the magnesium alloy anodized film were studied.The results show that all magnesium alloy anodized film consisted of MgO and Mg2SiO4 phase.After adding Na2CO3 and C6H12O6 into electrolyte,the micropores evenly distributed on the surface of the anodized film,and the size decreased;the thickness of the anodized film increased.When the mass concentration of Na2CO3 increased from 10 g·L^-1 to 30 g·L^-1,the size of micropores increased,and the thickness of anodized film decreased.When the mass concentration of C6H12O6 increased from 5 g·L^-1 to 15 g·L^-1,the size of micropores decreased,and the thickness of anodized film increased.The main corrosion form of magnesium alloy anodized film was pitting,which presented a distribution of fluvial pattern.After adding 10 g·L^-1 Na2CO3 into the electrolyte,the micropores had the smallest size with the diameter of 1-3μm,and the thickness of the anodized film reached 16μm;the anodized film had relatively good corrosion resistance.

关 键 词：镁合金 阳极氧化 微观结构 耐腐蚀性能 NA2CO3 C6H12O6 

分 类 号：TG146.2[一般工业技术—材料科学与工程]