Abstract

In this present paper, the electropolishing behavior of Ti–6Al–4V alloy fabricated by additive manufacturing in chloride-containing ethylene glycol electrolyte was surveyed. The impacts of chloride ion on surface quality and oxide film of Ti–6Al–4V were analyzed in dependence on the surface topography, roughness, weight loss ratio and compositions. The visual and microscopic results revealed that the optimally electropolished surface was attained in a 0.4 mol L⁻¹ chloride electrolyte with a decreased surface roughness of 75.04% and a weight loss rate of 4.93%. For lower (C⁻¹_Cl ≤ 0.3 mol L⁻¹) or higher concentrations (C⁻¹_Cl ≥ 0.5 mol L⁻¹), a smooth and flat surface was not observed due to insufficient reactions or excessive anodic dissolution. During the electropolishing, the titanium oxides nucleated and corresponding surface tension increased, resulting in the formation of a stable TiO₂ film on the surface of the Ti–6Al–4V alloy, increasing the corrosion resistance of the specimen.

Graphic Abstract

中文翻译：

---

增材制造的Ti-6Al-4V合金的电化学抛光

抽象的

本文研究了通过增材制造在含氯化物的乙二醇电解质中制备的Ti-6Al-4V合金的电抛光行为。根据表面形貌，粗糙度，失重率和组成，分析了氯离子对Ti-6Al-4V表面质量和氧化膜的影响。视觉和显微镜结果表明，在0.4mol L ^-1氯化物电解质中获得了最佳的电抛光表面，其表面粗糙度降低了75.04％，失重率为4.93％。为低级^{（C -1}_氯 ≤0.3摩尔大号^-1）或更高的浓度^{（C -1}_氯 ≥0.5摩尔大号^-1），由于反应不足或阳极过度溶解，未观察到光滑而平坦的表面。在电抛光过程中，钛氧化物成核，相应的表面张力增加，导致在Ti-6Al-4V合金表面形成稳定的TiO ₂膜，从而提高了样品的耐蚀性。

图形摘要