旋转磁场对AZ91D镁合金表面磷化处理的影响

Influences of Rotating Magnetic Fields on the Surface Phosphating Treatment of AZ91D Magnesium Alloy

在AZ91D镁合金进行表面磷化处理过程中,引入旋转磁场。研究不同的磁场条件对镁合金表面磷化膜的耐腐蚀能力及表面形貌结构的影响,分析了不同磁场条件下磷化膜的耐腐蚀能力及表面形貌的特点。结果表明,辅助磁场对镁合金表面形貌及结构有一定积极影响,在一定范围内,辅助磁场转速越高,表面磷化膜越均匀、致密且含磷量越高,且其抗腐蚀能力也越高,超过最佳转速后,对镁合金表面磷化膜质量具有消极作用。

Rotating magnetic fields were introduced in phosphating treatment process of AZ91D magnesi- um alloy. Influences of different magnetic field conditions on corrosion resistance and surface morphologi- cal structure of the phosphate coating were studied, and characteristics of corrosion resistance and surface morphology of the phosphate coating under different magnetic field conditions were analyzed. Results showed that auxiliary magnetic field had some positive influences on the surface morphology and structure of the magnesium alloy,within a certain range：the higher the auxiliary magnetic field rotating speed, the more uniform the phosphate coating surface, the denser the phosphorus content, the higher the corrosion resistance. But when the rotating speed exceeded the optimum value, the auxiliary magnetic field would have negative influences on the phosphate coating quality.