Shahsavari Mohammadali, Imani Amin, Setavoraphan Andaman, Schaller Rebecca Filardo, Asselin Edouard
Department of Materials Engineering, The University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.
Sandia National Laboratories, Albuquerque, NM, USA.
Sci Rep. 2022 Jul 8;12(1):11589. doi: 10.1038/s41598-022-14907-2.
This study explores the effect of surface re-finishing on the corrosion behavior of electron beam manufactured (EBM) Ti-G5 (Ti-6Al-4V), including the novel application of an electron beam surface remelting (EBSR) technique. Specifically, the relationship between material surface roughness and corrosion resistance was examined. Surface roughness was tested in the as-printed (AP), mechanically polished (MP), and EBSR states and compared to wrought (WR) counterparts. Electrochemical measurements were performed in chloride-containing media. It was observed that surface roughness, rather than differences in the underlying microstructure, played a more significant role in the general corrosion resistance in the environment explored here. While both MP and EBSR methods reduced surface roughness and enhanced corrosion resistance, mechanical polishing has many known limitations. The EBSR process explored herein demonstrated positive preliminary results. The surface roughness (R) of the EBM-AP material was considerably reduced by 82%. Additionally, the measured corrosion current density in 0.6 M NaCl for the EBSR sample is 0.05 µA cm, five times less than the value obtained for the EBM-AP specimen (0.26 µA cm).
本研究探讨了表面再加工对电子束制造（EBM）的Ti-G5（Ti-6Al-4V）腐蚀行为的影响，包括电子束表面重熔（EBSR）技术的新应用。具体而言，研究了材料表面粗糙度与耐腐蚀性之间的关系。在打印态（AP）、机械抛光态（MP）和EBSR态下测试了表面粗糙度，并与锻造（WR）对应物进行了比较。在含氯介质中进行了电化学测量。结果表明，在此处研究的环境中，表面粗糙度而非底层微观结构的差异对耐全面腐蚀性起着更重要的作用。虽然MP和EBSR方法都降低了表面粗糙度并提高了耐腐蚀性，但机械抛光有许多已知的局限性。本文探索的EBSR工艺展示了积极的初步结果。EBM-AP材料的表面粗糙度（R）大幅降低了82%。此外，EBSR样品在0.6 M NaCl中的测量腐蚀电流密度为0.05 µA/cm，比EBM-AP试样（0.26 µA/cm）获得的值小五倍。
