Effect of Electrolytic Solution Concentrations on Surface Hydrophilicity of Micro-Arc Oxidation Ceramic Film Based on Ti6Al4V Titanium Alloy

摘要:

在不同电解液浓度的钙盐和磷酸盐混合体系中对Ti6Al4V合金进行微弧氧化（MAO）以改善其微观结构和亲水性能。利用扫描电镜、X射线衍射仪、测厚仪以及电化学工作站等对生成膜层的显微结构、物相组成、厚度以及亲水性能进行研究。结果表明：所制备的微弧氧化膜表面为粗糙多孔结构，含锐钛矿、金红石以及少量羟基磷灰石。随磷酸二氢钾浓度升高，羟基磷灰石相增多；微弧氧化膜厚度增大到一定值后不再发生变化；微弧氧化致密层与疏松层比例发生变化，增厚的疏松层表面多孔，且有较多含Ca、P的羟基磷灰石相，陶瓷膜的亲水性能提高，使得微弧氧化陶瓷膜的生物相容性得到提高。

Abstract:

The present work focuses on the surface of Ti6Al4V titanium alloy to improve its microstructure and hydrophilic property using micro-arc oxidation (MAO) in a mixed electrolyte system with different concentrations of calcium salt and phosphate salt. The morphology, the crystalline structure, the thickness and the hydrophilic property of the MAO film were detected by scanning electron microscopy(SEM), X-ray diffraction(XRD), eddy current thickness meter and electrochemical work station. Results show that the MAO film surface is porous and composed of anatase, rutile and a small amount of hydroxyapatite. The amount of hydroxyapatite phase increases with increasing of potassium dihydrogen phosphate concentration. The thickness of MAO film will not change until it increases to a certain value. The ratio of the surface loose zone to the inner compact zone changes with increasing of the potassium dihydrogen phosphate concentration. The thicker loose layer surface is porous and has the hydroxyapatite phase with more Ca and P, which can improve the hydrophilic property and biological compatibility of MAO ceramic film.