铝合金微弧电泳复合膜层的工艺制备

Preparation and Properties of Micro-Arc Oxidation/Electro-phoresis Composite Film on Aluminum Alloy

采用微弧氧化的方法先在铝合金表面制备一层致密多孔的陶瓷层,然后再通过电泳处理在铝合金表面制备出微弧电泳复合膜层。采用扫描电镜对复合膜层的表面形貌和截面线进行扫描分析,通过电化学分析和划格法测结合力试验对微弧电泳膜层性能进行了检测分析,并进一步探讨了不同的微弧氧化参数对后续电泳成膜的影响。结果表明,微弧电泳复合膜层的耐碱性及与基体间结合力均优于传统电泳膜层,且微弧氧化膜层的厚度影响后续电泳能否成膜,氧化层的致密性影响后续电泳膜层的光洁度。

Compact and porous ceramic coating was prepared on Al alloy by micro-arc oxidation,then elec-trophoresis coating was deposited on the micro-arc oxidation layer to obtain micro-arc oxidation/electrophoresis composite film.The surface and cross-sectional microstructures of the composite film were analysed by means of scanning electron microscopy(SEM).The performance of the composite film was analyzed using electrochemical tests,and the adhesion strength of the composite film was evaluated using scratching teat.In addition,the influence of the micro-arc oxidation parameters on the formation of the elec-trophoresis film was explored.Results indicated that the composite film had better resistance to alkali and adhesion strength to substrate than conventional electrophoresis film.At the same time,the formation of the electrophoresis film was greatly dependent on the thickness of the micro-arc oxidation film,and the surface roughness of the electrophoresis film was highly dependent on the compactness of the micro-arc oxidation layer.