Quantitative analysis of local fine structure on diffusion of point defects in passive film on Ti
By Wang, Lu; Yu, Hongying; Wang, Shaoyang; Chen, Bao; Wang, Yuhang; Fan, Wenqiang; Sun, Dongbai
Published in Electrochimica Acta
2019
Abstract
The diffusion of point defects in passivation determines all physico-electrochemical processes in materials corrosion and protection. In this study, a multiscale quantitative methodology was developed to reveal the diffusivity of oxygen vacancies on titanium surface (?5.0 nm thickness) in 1.0 M H2SO4 solution based on X-ray absorption fine structure (XAFS), combining with electrochemical impedance spectroscopy (EIS) and Mott-Schottky. EIS equivalent circuit exhibits that the high electronic field across passive film is 1.06
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