Corrosion behavior and surface characterization of Ti-20Cr alloy in a solution containing fluoride

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Abstract

The purpose of this study was to investigate the correlation between corrosion resistance and surface composition of an experimental Ti-20 mass% Cr casting alloy in a saline solution containing fluoride. The alloy had a greater resistance to corrosion in a fluoride-containing saline solution than did commercially pure titanium. However, with confirmed dissolution of titanium and chromium, it meant that the fluoride in the saline solution corroded the alloy slightly. X-ray photoelectron spectroscopy analysis revealed that the surface composition of the alloy consisted of titanium and chromium oxides containing hydroxide. The [Ti]/([Ti]+[Cr]) ratio in the surface oxide film decreased when immersed in fluoride-containing saline solution, that is, the surface oxide film became chromium-rich oxide. Therefore, the alloy obtained good corrosion resistance to fluoride due to formation of a chromium-rich oxide film.

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Takemoto, S., Hattori, M., Yoshinari, M., Kawada, E., Asami, K., & Oda, Y. (2004). Corrosion behavior and surface characterization of Ti-20Cr alloy in a solution containing fluoride. Dental Materials Journal, 23(3), 379–386. https://doi.org/10.4012/dmj.23.379

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