Corrosion behavior and surface characterization of Ti-20Cr alloy in a solution containing fluoride.
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.
Takemoto
Shinji
S
Department of Dental Materials Science, Tokyo Dental College, Chiba, Japan. takemoto@tdc.ac.jp
Hattori
Masayuki
M
Yoshinari
Masao
M
Kawada
Eiji
E
Asami
Katsuhiko
K
Oda
Yutaka
Y
D002858:Chromium Alloys / Q000737:chemistry*; D003343:Corrosion; D004563:Electrochemistry; D005459:Fluorides / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D013052:Spectrometry, X-Ray Emission; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D002858:Chromium Alloys; C009495:titanium dioxide; D014025:Titanium; D005459:Fluorides