热氧化处理对纯钛耐腐蚀性能影响的研究

选取TA2纯钛为研究对象,在箱式电阻炉中进行不同温度与不同时间的热氧化处理,研究了不同工艺热氧化处理试样在36%~38%HCl(室温)和30%H2O2(36.5℃)中的耐腐蚀性。采用扫描电子显微镜(SEM)观察了热氧化处理试样表面形貌,XRD进行了物相分析,用电子天平称重。研究结果表明,TA2纯钛在600℃以上热氧化处理在其表面形成了比原始态更厚的金红石型TiO2氧化膜,且TiO2氧化膜随热氧化温度升高而加厚;热氧化后TA2试样在36%~38%HCl和30%H2O2中耐腐蚀性明显改善,改善TA2耐蚀性的最佳热氧化工艺条件为:热氧化温度700℃;热氧化时间330~500 min。

Study on the Effect of Thermal Oxidation on CP-Ti Corrosion Resistance

Commercially pure titanium （CP-Ti） TA2 samples were subjected to thermal oxidation （TO） treatment at different temperature. The morphological feature, structural characteristics and weight of thermally oxidized samples were studied by scanning electron microscope（ SEN）, X-ray diffraction（XRD） and electronic balance. The corrosion resistance of thermally oxidized samples in 36% - 38% HC1 （ room temperature ） and 30% H2O2 （ 36. 5℃ ） were investigated. The results show that, when the TO temperature is above 600℃, the oxidized layer is composed of TiO2, and the thickness of TiO2 oxidized layer increases with the temperature increased. And the corrosion resistance in HC1 and H202 increases significantly after TO treatment, and the optimum TO condition is treating temperature of 700℃ and duration of 330 -500min.