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以四氯化钛为原料,制备纳米TiO2溶胶,再采用浸渍-提拉法在纯Mg表面制得TiO2薄膜,随后涂有TiO2的纯Mg分别在100、300、500℃下热处理2h。采用XRD、DSC/TG、FT-IR、FE-SEM表征不同热处理条件下试样的组成和结构;通过动电位极化表征试样的耐蚀性,考察温度对TiO2涂层纯Mg试样耐蚀性的影响。结果表明TiO2涂层可提高纯Mg的耐蚀性;100℃热处理试样具有最优的耐蚀性,其腐蚀电流密度为4.5×10-3 mA/cm2,较纯Mg的3.256mA/cm2明显下降;随着温度的升高,试样的耐蚀性趋于下降。并对TiO2涂层的耐蚀机理进行了讨论。
Titanium tetrachloride was used as raw material to prepare nano-TiO2 sol, then TiO2 film was prepared on pure Mg by impregnation-Czochralski method, then pure TiO2 coated with TiO2 was heat-treated at 100, 300 and 500 ℃ for 2 h respectively. The composition and structure of the samples under different heat treatment conditions were characterized by XRD, DSC / TG, FT-IR and FE-SEM. The corrosion resistance of the samples was characterized by potentiodynamic polarization. Erosive effects. The results show that the TiO2 coating can improve the corrosion resistance of pure Mg. The sample with 100 ℃ heat treatment has the best corrosion resistance. The corrosion current density is 4.5 × 10-3 mA / cm2, which is obviously higher than pure 3.256mA / cm2 Decline; as the temperature increases, the corrosion resistance of the sample tends to decline. The corrosion mechanism of TiO2 coating is also discussed.