Abstract
The effects of dissolved oxygen (DO) on the corrosion behavior of pure titanium in acidic fluoride-containing acids (pH = 0.6–2.0) were evaluated by electrochemical methods, such as open circuit potential (OCP) measurements, potentiodynamic polarization tests, and electrochemical impedance spectroscopy (EIS), combined with surface characterization by X-ray photoelectron spectroscopy (XPS). The results showed that DO affected the anodic kinetic parameters, except the passive current density, by decreasing the maximum anodic current density as well as influencing its dependence on pH and the fluoride concentration. However, DO had no detectable contribution to the total cathodic process at potentials in the active region of titanium. The critical fluoride concentration for the corrosion of titanium was consistently determined by means of three kinds of electrochemical methods. The critical value increased with the DO content, and its dependence on pH was also affected by DO, which were attributed to the effects of DO on the anodic parameters. Additionally, multiple corrosion potentials were discovered under some specific conditions with DO, which resulted from the non-negligible contribution of ORR to the total cathodic current density at relatively higher potentials.
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The authors gratefully acknowledge financial support of National Basic Research Program of China (973 Program) (No. 2014CB643304) and the National Environmental Corrosion Platform (2005DKA10400).
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Wang, Z.B., Hu, H.X. & Zheng, Y.G. Evaluation of the dissolved oxygen-related electrochemical behavior of pure titanium in acidic fluoride-containing solutions. J Solid State Electrochem 20, 3459–3471 (2016). https://doi.org/10.1007/s10008-016-3321-5
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DOI: https://doi.org/10.1007/s10008-016-3321-5