In this study, the effects of microstructure, surface roughness, and surface porosity on the corrosion behavior of direct metal laser sintered (DMLS) Ti-6Al-4V were experimentally investigated. The electrochemical measurements were conducted using a three-electrode setup setting, with the specimens in Ringer’s solution at 37 °C. The acicular microstructure in the DMLS Ti-6Al-4V samples resulted in greater corrosion resistance than that of the Grade 5 alloy with an equiaxed microstructure. Electrochemical study results indicated that microstructure and surface roughness had a significant influence on the corrosion behavior of the samples. Pits and cracks were observed near the edges of the original surface pores in the as-printed samples after a 1-month immersion in simulated body fluid. The results showed that the acicular microstructure with a small number of surface pores and a smooth surface led to more desirable corrosion resistance.

在这项研究中，实验研究了微观结构，表面粗糙度和表面孔隙率对直接金属激光烧结（DMLS）Ti-6Al-4V腐蚀行为的影响。电化学测量使用三电极设置进行，样品在37℃的林格氏溶液中进行。DMLS Ti-6Al-4V样品中的针状显微组织比具有等轴显微组织的5级合金具有更高的耐腐蚀性。电化学研究结果表明，显微组织和表面粗糙度对样品的腐蚀行为有重要影响。将样品浸入模拟体液中1个月后，在印刷样品的原始表面孔的边缘附近观察到凹坑和裂缝。