Additively manufactured Ti–6Al–4V (TC4) parts have been successfully employed as artificial implants in dental and orthopedic surgery due to their excellent mechanical properties. However, the suboptimal corrosion resistance limits their applications. The surface characterization and corrosion behavior of micro-arc oxidation (MAO) treated TC4 alloy prepared by selective electron beam melting (SEBM) and selective laser melting (SLM) technologies were compared. The corrosion resistance mechanism of SLM-MAO and SEBM-MAO was clarified through the analysis of the microstructure evolution, surface morphology, and electrochemical experiments. The results show that the anatase-type TiO₂ is partially transformed into the slankite phase after MAO treatment. The surface roughness of SEBM sample was reduced by MAO coating, while the surface roughness of SLM sample increased after MAO, which is related to the difference between the microstructure of the deposited samples caused by different additive manufacturing technologies. When MAO time was 15 min, SLM-MAO and SEBM-MAO coating displayed the best and the worst corrosion resistance, respectively.

增材制造的 Ti-6Al-4V (TC4) 部件由于其优异的机械性能已成功地用作牙科和骨科手术中的人工植入物。然而，次优的耐腐蚀性限制了它们的应用。比较了选择性电子束熔化 (SEBM) 和选择性激光熔化 (SLM) 技术制备的微弧氧化 (MAO) 处理的 TC4 合金的表面表征和腐蚀行为。通过对显微组织演变、表面形貌和电化学实验的分析，阐明了 SLM-MAO 和 SEBM-MAO 的耐蚀机理。结果表明，锐钛矿型 TiO ₂经 MAO 处理后部分转变为 slinkite 相。MAO涂层后SEBM样品的表面粗糙度降低，而MAO后SLM样品的表面粗糙度增加，这与不同增材制造技术造成的沉积样品微观结构的差异有关。当 MAO 时间为 15 min 时，SLM-MAO 和 SEBM-MAO 涂层分别表现出最好和最差的耐腐蚀性。