ABSTRACT

In this study, the ceramic coating was prepared on Ti6Al4V alloy by scanning micro-arc oxidation (SMAO). The growth features of SMAO coating were investigated by combining the voltage and discharge variation. The result shows that a higher working voltage is obtained during SMAO treatment owing to additional resistance from the electrolyte column. As the SMAO goes on, the discharge region moves to the electrolyte column edge, exhibiting an annular shape. The current density with Gaussian distribution is observed between the stainless-steel tube (cathode) and titanium substrate (anode), which causes the SMAO coating to show a higher thickness in the middle and lower on both sides. Similar to traditional MAO, the SMAO coating has an enhancement in the thickness, pore size and Si content with increasing oxidation time, but coating degradation occurs in the later stage of SMAO. The SMAO coating mainly consists of amorphous SiO₂, rutile and anatase phases.

摘要

本研究采用扫描微弧氧化（SMAO）技术在Ti6Al4V合金上制备陶瓷涂层。通过结合电压和放电变化来研究 SMAO 涂层的生长特征。结果表明，由于电解质柱的额外电阻，SMAO 处理期间获得了更高的工作电压。随着SMAO的进行，放电区域移动到电解质柱边缘，呈现环形形状。在不锈钢管（阴极）和钛基体（阳极）之间观察到呈高斯分布的电流密度，这导致SMAO涂层呈现出中间较高、两侧较低的厚度。与传统MAO类似，SMAO涂层的厚度、孔径和Si含量随着氧化时间的增加而增加，但SMAO后期发生涂层降解。SMAO涂层主要由非晶态SiO组成₂、金红石相和锐钛矿相。