期刊
APPLIED SURFACE SCIENCE
卷 542, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148740
关键词
Diamond-like carbon; TiC nanocrystalline; Permeation; Corrosion mechanism; First principle calculation
类别
资金
- National Natural Science Foundations [51705447, 51905466]
- P. R. China, Youth Top Talent Project of Hebei Province Higher Education [BJ2019058]
- Natural Science Foundation of Hebei Province China [E2020203184]
The corrosion mechanism of Ti-doped diamond-like carbon (Ti-DLC) films was found to be related to the formation of TiC nanocrystalline, which decreases the migration barrier and energy of Cl atom permeation in the film, resulting in a faster corrosion failure compared to pure DLC films in 3.5 wt% NaCl solution.
The corrosion mechanism of Titanium doped Diamond-like carbon (Ti-DLC) films was investigated by electrochemical tests and first-principle calculations. Potentiodynamic polarization curves and Electrochemical impedance spectroscopy (EIS) show that the Ti-DLC films exhibit a poor corrosion resistance than that of pure DLC film in 3.5 wt% NaCl solution. The formed TiC nanocrystalline in Ti-DLC film reduce the migration barrier and energy of Cl atom permeation in the film, which causes a lower total system energy change of the crystal plane TiC, interface structure of TiC and amorphous carbon (TiC/a-C) than that of pure DLC film, and then accelerates the corrosion failure of the Ti-DLC film.
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