Abstract
Commercially pure titanium (CP-Ti) was subjected to thermal oxidation at different temperatures and times for determining the optimum oxidation conditions to obtain the optimum corrosion resistance. The phase constituents of the samples were determined by X-ray diffraction (XRD), the morphology of the surface was observed by SEM, and the corrosion behavior was investigated using immersion test by exposing the samples in HCl solutions with a concentration of 37%. The results showed that Rutile TiO2 layer was formed on the surface of CP-Ti after thermal oxidation and the thickness of the TiO2 layer increased with the treating temperature. Meanwhile, it was found that the optimum corrosion resistance to HCl was obtained while oxidizing at 700℃ for 330min～500min.
Highlights
Ti and its alloys are very attractive materials due to their various outstanding properties, such as high strength to weight ratio, good fatigue properties, excellent corrosion resistance, and good biocompatibility properties, etc [1,2]
The aim of this research is to determine the suitable thermal oxidation condition of Commercially pure titanium (CP-Ti) to get the optimum corrosion resistance in HCl, and it is found oxidizing at 700°C for 330min~500min is appropriate condition
It can be seen that the X-ray diffraction (XRD) patterns of samples thermally oxidized at temperature range of 600-750°C exhibit rutile TiO2, and the intensity of rutile TiO2 becomes stronger with the increase of treating temperature, which suggests that the thickness of the oxide layer increases with the treating temperature
Summary
Ti and its alloys are very attractive materials due to their various outstanding properties, such as high strength to weight ratio, good fatigue properties, excellent corrosion resistance, and good biocompatibility properties, etc [1,2]. The CP-Ti samples with dimension of 10mm×10mm×5mm were cut from the bar, polished using various grades of SiC paper, ultrasonically cleaned in deionized water and acetone for 5 minutes, respectively, dried prior to thermal oxidation using a stream of cold compressed air.
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