Additive manufacturing (AM) technologies are gaining increasing attraction for biomedical applications due to the granted customizability and optimal surface topography for osteointegration. Ti-6Al-4V is one of the most promising materials due to its biocompatibility. However, excessive ions release can occur, leading to a relevant immunologic response in the surrounding tissues. Despite the corrosion behavior of the conventionally-manufactured material being well known, it should be assessed for AM-processed components, as the effect of the unique superficial and microstructural features granted by the process is still quite unknown. The aim of this paper is the electrochemical evaluation of the passive current density of the laser powder bed fusion (LPBF)-processed Ti-6Al-4V alloy via potentiostatic tests, carried out at typical in-service potentials for biomedical implants. This parameter is correlated with the ion release rate of the alloy, a fundamental phenomenon to address to prevent possible inflammations caused by the implant. Different manufacturing conditions (surface finishing, heat treatment) and exposure time (0, 60 and 6000 h) were considered. The importance of performing these measurements over a long period (> 8 months) was demonstrated. In fact, despite the initial current densities being significantly affected by the surface and microstructural differences, the ion release rates converged for long-time exposures. The results also underlined the good corrosion resistance of the material. Poor corrosion performances, alongside with significant current densities development, were observed in the as-built condition. A pickling treatment demonstrated to mitigate such effect without compromising the unique surface finishing granted by the manufacturing technology.

由于授予的可定制性和用于骨整合的最佳表面形貌，增材制造 (AM) 技术对生物医学应用的吸引力越来越大。Ti-6Al-4V由于其生物相容性而成为最有前途的材料之一。然而，可能会发生过多的离子释放，从而导致周围组织产生相关的免疫反应。尽管传统制造材料的腐蚀行为是众所周知的，但应该对 AM 加工部件进行评估，因为该工艺赋予的独特表面和微观结构特征的影响仍然是未知数。本文的目的是通过恒电位测试对激光粉末床熔融 (LPBF) 处理的 Ti-6Al-4V 合金的被动电流密度进行电化学评估，在生物医学植入物的典型在役潜力下进行。该参数与合金的离子释放速率相关，这是防止植入物可能引起炎症的基本现象。考虑了不同的制造条件（表面处理、热处理）和暴露时间（0、60 和 6000 小时）。证明了长时间（> 8 个月）执行这些测量的重要性。事实上，尽管初始电流密度受到表面和微观结构差异的显着影响，但离子释放速率在长时间暴露时会收敛。结果还强调了该材料良好的耐腐蚀性。在竣工条件下观察到较差的腐蚀性能以及显着的电流密度发展。