镁合金等离子体氧化时火花变化规律的研究

研究Magoxid工艺中镁合金等离子体氧化的过程,此过程分为三个阶段:普通阳极氧化、微弧氧化以及弧光氧化.随着氧化的进行,施加的电压不断升高,火花由微弧向弧光过渡.而微弧和弧光开始均主要集中于样品的边缘,然后均匀分布于整个样品表面.与微弧氧化阶段相比,弧光氧化阶段火花的数量明显减少,尺寸增大,并且持续的时间延长.与火花变化过程相对应,氧化膜表面孔数量减少,直径逐渐增大.氧化时间超过10min后,氧化膜表面呈现不明显的多孔结构.

Study on Spark Change Regularity during Plasma Anodizing on Magnesium Alloys

In Magoxid process,the plasma anodizing process on magnesium was studied.It was classified into three stages: traditional anodization,micro-arc anodization and arcing.With anodization proceeding,the applied voltage increased and the transition from micro-arc to arcing stage took place.Initially,both micro-arc and arcing sparks mainly concentrated on edges of the sample and then covered the entire surface.Compared to micro-arc stage,the sparks on arcing decreased greatly in number,became bigger and their lifetime increased.Corresponding to spark changes,the pores of anodic coatings decreased in number but increased in diameter.After 10 min anodization,anodic coatings turned to no evidently porous structure.