不同含磷电解液在微弧氧化过程中的作用

THE ACTION OF THE FORMS OF P ELEMENT ON THE PROCESS OF THE MICROARC OXIDATION

改变电解液的组成 ,在相同条件下进行铝镁合金表面的微弧氧化处理 ,用SEM/EDS手段观察氧化膜的形貌及对其成分分析并测量微弧氧化膜的厚度 ,根据锉刀试验评价氧化膜与基体的结合力 .结果表明 ,磷元素的大化学计量比可以提高微弧氧化成膜速度 ,降低氧化膜的孔隙率 ,提高其致密性 ,增强与基体的结合力 ,并改变了氧化膜的组成 ;同时 ,分子的聚合状态也影响其成膜速度和氧化膜的孔隙率 ,链状聚合物可提高氧化膜成膜速度及氧化膜的致密性 ,降低其孔隙率 ,而环状聚合物对其影响较小 .

Under the same conditions,the Al-Mg alloys surface treatment was performed by the microarc oxidation with different components of electrolytes.The thickness of the microarc oxidation coating was measured by the thickness gauge.Surface morphology and composition of the coating were analyzed by scanning electron microscopy (SEM)coupling with energy dispersive X-ray (EDS); the adhesion between the oxidation coating and the substrate was evaluated by means of the file.The results showed that the high stoichiometry of the phosphorus element increased the growth rate and the compactness of the oxidation coating,decreased its porosity,boosted up the adhesion between the oxidation coating and the substrate,and influenced the composition of the microarc oxidation coating.At the same time,the molecule polymerization state had an effect on the growth rate and the porosity of the coating,on which the linear polymer had a more useful impact than the cyclic polymer did.