Surgical and Orthopaedic Research Laboratories, Prince of Wales Clinical School, University of New South Wales, Level 1, Clinical Sciences Building Gate 6, Prince of Wales Hospital, Avoca Street, Randwick, Sydney, NSW, 2031, Australia.
Ann Biomed Eng. 2019 Jan;47(1):162-173. doi: 10.1007/s10439-018-02111-1. Epub 2018 Aug 15.
3D-printing technologies such as electron beam melting (EBM) have allowed for patient-specific orthopaedic implants, however differences generated from the fabrication process may alter the corrosion properties of Ti6Al4V implants. This study evaluated the corrosion characteristics of EBM-fabricated Ti6Al4V, alongside any linked microstructural and surface changes. EBM-fabricated Ti6Al4V and wrought Ti6Al4V specimens (n = 10 per group) underwent microstructural and surface characterisation before and after corrosion testing. Cyclic potentiodynamic polarisation of specimens was conducted in accordance with ASTM Standard F2129-17. The degree of corrosion damage was subsequently assessed via qualitative and quantitative measures. EBM-fabricated Ti6Al4V demonstrated a higher proportion of β phases and greater surface roughness, compared to wrought Ti6Al4V. Significant differences were observed for all corrosion parameters between the two groups. The lower breakdown potentials (E) for EBM-fabricated Ti6Al4V (2.035 V), compared to wrought Ti6Al4V (3.667 V), indicate a lower resistance to pitting corrosion. A greater resultant spread, and severity of corrosion damage was noted on wrought Ti6Al4V. An inferior in vitro corrosion resistance was observed for EBM-fabricated Ti6Al4V. Without post-processing, the rougher surface and differences in microstructure are likely to contribute to this. This suggests potential clinical implications upon in vivo implantation, although corrosion measures remain above recommended minimums.
3D 打印技术，如电子束熔化（EBM），已经可以用于制造特定患者的骨科植入物，然而，制造过程中产生的差异可能会改变 Ti6Al4V 植入物的腐蚀性能。本研究评估了 EBM 制造的 Ti6Al4V 的腐蚀特性，以及任何与之相关的微观结构和表面变化。EBM 制造的 Ti6Al4V 和锻造 Ti6Al4V 试样（每组 10 个）在腐蚀试验前后进行了微观结构和表面特性分析。根据 ASTM 标准 F2129-17 对试样进行了循环动电位极化。随后通过定性和定量测量评估腐蚀损伤的程度。与锻造 Ti6Al4V 相比，EBM 制造的 Ti6Al4V 具有更高比例的β相和更大的表面粗糙度。两组之间的所有腐蚀参数均存在显著差异。EBM 制造的 Ti6Al4V 的击穿电位（E）较低（2.035 V），而锻造 Ti6Al4V 的击穿电位（3.667 V）较高，这表明 EBM 制造的 Ti6Al4V 对点蚀腐蚀的抵抗力较低。锻造 Ti6Al4V 的腐蚀损伤扩展程度和严重程度更大。EBM 制造的 Ti6Al4V 的体外耐腐蚀性较差。未经后处理，粗糙的表面和微观结构的差异可能是导致这种情况的原因。这表明在体内植入后可能存在潜在的临床影响，尽管腐蚀程度仍高于推荐的最小值。
