摘要
为了进一步说明溶液体系的作用机理、监控方法对参量的保护及微弧氧化的稳定性,在硅酸盐与磷酸盐溶液体系中,研究了MB8镁合金微弧氧化处理的起弧电压,所生成的陶瓷层厚度及孔隙率与溶液电导率的关系。用扫描电镜和盐雾腐蚀试验等方法,分析了不同电导率溶液中所生成的陶瓷层微观结构及耐蚀性。结果表明:随溶液电导率的增大,发生微弧氧化现象的起弧电压减小,微弧氧化陶瓷层厚度表现出近似线性增长,陶瓷层的孔隙率逐渐增大;陶瓷层的耐蚀性随电导率的增大表现出先增后减的变化趋势,在溶液电导率为5～6(Ω·m)^(-1)时,陶瓷层的耐蚀性最好。
Relations between solution conductivity and striking voltage in micro-arc oxidation process, ceramic thickness and porosity were studied in the solution of silicate and phosphate. The microstructure and corrosion resistance of ceramic coatings on magnesium alloys formed in solution with different conductivities by micro-arc oxidation were characterized by using SEM and salt spray tests. The results show that with the increase of solution conductivity, the striking voltage falls down, the thickness of ceramic coating increases near linearly, and the porosity increases gradually. Moreover, the corrosion resistance of coatings improves first and then decreases, and the best is at the conductivity of 5～6 O/m.
出处
《材料保护》
CAS
CSCD
北大核心
2004年第4期7-9,共3页
Materials Protection
基金
国家"十.五"科技攻关计划(2001BA311A06-3)
关键词
微弧氧化
镁合金
电导率
耐蚀性
micro-arc oxidation
magnesium alloy
conductivity
corrosion resistance
