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对TA2工业纯钛进行不同温度热氧化处理。采用光学显微镜(OM)和扫描电子显微镜(SEM)分析热氧化处理试样截面组织,用EDS和XRD进行微区成分和物相分析;研究不同温度氧化处理试样的表层显微硬度以及浓盐酸中的耐腐蚀性,采用SEM观察试样腐蚀前后表面形貌。结果表明,热氧化后TA2表面形成了金红石型TiO2氧化膜,整个氧化层由金红石型TiO2氧化层、外扩散层和内氧扩散层构成。TiO2氧化膜厚度随热氧化温度升高而增加,700℃以下增速很缓、超过700℃快速增厚;热氧化处理表层硬度亦随热氧化温度升高而提高。热氧化TA2试样在36%～38%HCl中耐腐蚀性明显改善,其中700℃热氧化处理的耐蚀性最优。
TA2 industrial titanium thermal oxidation at different temperatures. The microstructure of the samples was analyzed by optical microscope (OM) and scanning electron microscope (SEM). The microstructure and phase analysis of the samples were investigated by EDS and XRD. In the corrosion resistance, SEM observation of the surface morphology of the sample before and after corrosion. The results show that the rutile TiO2 film is formed on the surface of TA2 after thermal oxidation, and the whole oxide layer is composed of rutile TiO2 oxide layer, outer diffusion layer and inner oxygen diffusion layer. The thickness of TiO2 oxide film increases with the increase of thermal oxidation temperature. The growth rate is very slow at 700 ℃ and rapidly increases at over 700 ℃. The hardness of thermal oxidation treatment also increases with the increase of thermal oxidation temperature. Thermal oxidation of TA2 samples in 36% ~ 38% HCl significantly improved corrosion resistance, of which 700 ° C thermal oxidation of the best corrosion resistance.