期刊
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
卷 14, 期 -, 页码 1459-1472出版社
ELSEVIER
DOI: 10.1016/j.jmrt.2021.07.006
关键词
Laser metal deposition; Ti-6Al-4V; Scanning strategy; Microstructural evolution; Corrosion behavior
资金
- National Natural Science Foundation of China [51871050]
- Fundamental Research Funds for the Central Universities [N180203019, N2002019]
- Liaoning Revitalization Talents Program [XLYC1907158]
- Natural Science Foundation Project of Liaoning Province [2020-MS-150, 2018225059]
- Shenyang Science and Technology Funded Project [RC190290]
The microstructural evolution and corrosion behavior of Ti-6Al-4V alloy fabricated by laser metal deposition (LMD) in simulated saliva were investigated in this study. The results showed that one-way scanning exhibited higher corrosion resistance than cross-scanning, but both were inferior to the wrought samples. Additionally, the higher content of b phase in the LMD-ed parts improved corrosion resistance compared to the conventional wrought counterpart.
In this study, microstructural evolution and corrosion behavior of Ti-6Al-4V (TC4) alloy fabricated by laser metal deposition (LMD) were investigated in simulated saliva at 37 degrees C as a function of scanning strategies. One-way scanning possessed a higher corrosion resistance than cross-scanning, but both of those were inferior to the wrought one. Compared with conventional wrought counterpart, the higher content of b phase improved the corrosion resistance. Results of MotteSchottky and potentiostatic tests indicated that the passive film upon the surfaces of all the samples exhibited an N-type semiconductor structure and instantaneous nucleation. Of these, the LMD-ed parts displayed a lower donor concentration, higher vacancy diffusion coefficient, and thicker passive film than the wrought samples. XPS analysis revealed that the double-layer structure of passive film leads to a dense protective layer on the surface while the oxide contents of the three were different. (C) 2021 The Authors. Published by Elsevier B.V.
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