电解液中Na_2SiO_3加入量对Ti6Al4V微弧氧化膜厚度及表面形貌的影响

Effect of Na_2SiO_3 addition in the electrolyte on the thickness and surface micromorphology of micro-arc oxidation coatings formed on Ti6Al4V

在不同Na2SiO3含量的电解液体系下对Ti6Al4V合金进行微弧氧化.采用SEM和AFM分析氧化膜表面形貌及粗糙度,研究电解液中Na2SiO3含量对氧化膜厚度及表面形貌的影响.结果表明:随着电解液中Na2SiO3质量浓度从12 g.L-1增加到28 g.L-1,临界正向起弧电压逐渐降低,微弧氧化膜的厚度由31μm增加至88μm;氧化膜表面均匀分布着尺寸不等的微孔,并且随着Na2SiO3质量浓度的增加,微孔的数目增多,粗糙度增加.XRD分析显示氧化膜的相组成为锐钛矿以及金红石.

Coatings were obtained by micro-arc oxidation on the surface of a Ti6A14V alloy in the electrolyte contained different contents of Na2SiO3. The surface micromorphology and roughness of coatings were analyzed by SEM and AFM, and the effects of Na2SiO3 content on the thickness and surface micromorphology of coatings were investigated. The results show that the thickness of coatings increases from 31 μm to 88 μm and the critical arcing forward voltage decreases gradually when the mass concentration of Na2SiO3 in the electrolyte increases from 12g·L^-1 to 28g· L^-1. There are many microholes with different sizes on the surface of coatings, and the amount of microholes and the roughness of coatings increase as the content of NaaSiO3 in the electrolyte increasing. It is found by X-ray diffraction analysis that the coatings are composed of anatase and ruffle.