Metastable pitting corrosion behavior of laser powder bed fusion produced Ti-6Al-4V in Hank’s solution
School of Engineering
Jiangsu Province six talent peaks project (Grant No. XCL-117), Natural Science Foundation of Jiangsu (Grant No. BK20201456, No.BK20210891 and BK20191458), Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515110394), Open Foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials (Grant No. 2020GXYSOF01, 2021GXYSOF03).
The metastable pitting corrosion behavior of laser powder bed fusion (LPBF) produced Ti-6Al-4V is still unclear. Therefore, this work investigated the metastable pitting corrosion of LPBF-produced Ti-6Al-4V in Hank’s solution by electrochemical methods. The LPBF-produced sample (dominant by α′ phase in the microstructure) shows a higher frequency of pit nucleation than the annealed counterpart (composed by α + β dual phase). The passive films formed on the LPBF-produced sample exhibit a higher flux of oxygen vacancies, resulting in the absorption of more aggressive ions (e.g., Cl-) thereby producing more cation vacancies. The condensation of excessive cation vacancies contributes to the pit nucleation.
Cui, Y. W., Chen, L. Y., Qin, P., Li, R., Zang, Q., Peng, J., ... & Zhang, L. C. (2022). Metastable pitting corrosion behavior of laser powder bed fusion produced Ti-6Al-4V in Hank’s solution. Corrosion Science, 203, 110333. https://doi.org/10.1016/j.corsci.2022.110333