摘要
采用高锰酸盐、钼酸盐、锡酸盐转化液分别对AZ91D镁合金进行表面化学转化,得到三种不同的化学转化膜。分别通过SEM、EDS和全浸试验研究不同转化膜的表面微观形貌、成分和腐蚀率,通过划格法和中性盐雾试验法研究转化膜外部有机涂层的附着性能和耐蚀性能。结果表明,高锰酸盐和钼酸盐转化膜表面具有大量微细裂纹,锡酸盐转化膜表面呈鱼鳞状,均为后续涂装提供了具有一定粗糙度的表面。锡酸盐转化膜的耐蚀性最好,高锰酸盐转化后并涂层的附着力和耐蚀性能最好。
Three different chemical conversion coatings for AZ91D magnesium alloy have been obtained by using permanganate solution, molybdate solution, and stannate solution respectively. Morphology, composition and corrosion rate of surface conversion coatings have been characterized by SEM, EDS and immersion test. Grid method and neutral salt spray test have been used to investigate the adhesion and corrosion behaviour of the organic coating. The results showed that the surface of permanganate and molybdate conversion coatings consisted of a number of micro-cracks, the surface stannate conversion coating was scaly, and all provided a certain roughness surface for follow-up coating on the magnesium substrate, the corrosion resistance of stannate conversion coating was the best, organic coating which based on permanganate conversion had the best adhesion behaviour and corrosion resistance.
出处
《中国铸造装备与技术》
CAS
2012年第1期1-5,共5页
China Foundry Machinery & Technology
关键词
镁合金
涂层
化学转化
耐蚀性能
Magnesium alloy
Coating
Chemical conversion
Corrosion resistance
