研究了AZ31镁合金-磷化膜的形成过程、工艺和配方, 并推测成膜离子磷酸根和锌离子等主要是在阳极附近结晶成长, 进而覆盖合金表面。从而设计了合理的四层防护装饰涂层体系, 并对其进行了性能检测。结果显示: 涂膜的附着力达到1级, 400 h的中性盐雾实验可达2级, 说明该涂层体系对镁合金有较好的防护作用, 磷化膜可以提高镁合金与有机涂层的结合力与耐腐蚀性。

The formation procese, technology and formalation of the phosphating on AZ31m agnesium a-lloy are deseribed. Themechanism of crystal growth of phospheric ion and zincion around cathod, then spreaded onto the surface of alloy is proposed. Therefore a four-coat coatings system is desighed, which is tested as well. It has shown that the adhesion reaches grade 1and 400 h salt spray reaches grade 2. It is indicated that the phosphating film can effective ly improve the adhesion of orgamic coatings on Mg alloy and the corrosion resistance.