摘要
研究AZ31镁合金微弧氧化过程中不同控制参数对膜性能的影响。镁合金微弧氧化中存在一个二次放电过程 ,它会对已长成的膜起破坏作用。通过改变溶液成分或浓度可对镁合金微弧氧化临界点的出现时间进行控制。在此基础上进一步研究一次放电不同控制过程对膜层性能的影响 ,发现采用渐进式升压方式能提高膜的致密层和疏松层的比例 ,但对膜的总厚度影响不大。合适的阴极匹配电压 ,可减小功耗 ,降低气孔率 ,改善膜的性能。
The phenomena of arc discharge in the process of microarc oxidation (MAO) on magnesium alloy was investigated. The effects of the process parameters on the coating properties were studied.It is found that the secondary arc discharge is easily involved in the process of MAO on magnesium alloys and local destruction of the coating formed before is observed. Fortunately, the secondary discharge can be controlled by a suitable experimental procedure. Two methods for applying voltage, which was keeping voltage at a constant value and programmed voltage method, were used in this study. The effect of the cathode voltage was also examined. The results show that the effective time of MAO depends on the composition and concentration of electrolytes and programmed voltage method improves the properties of coating by increasing the thickness of compact layer of the coating. The cathode voltage is necessary in controlling the secondary discharge.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2005年第1期77-80,共4页
Transactions of Materials and Heat Treatment
基金
北京师范大学本科科研基金项目
