不锈钢表面TiO_2改性层在H_2SO_4溶液中的电化学行为研究

Study on Electrochemical Behavior of TiO_2 Modified Layer in H_2SO_4 Solution

利用双层辉光离子渗金属技术,在不锈钢表面形成渗Ti层,渗金属温度为950℃,然后将渗钛试样置于GSL-1600X真空管式高温炉进行热氧化形成金红石型TiO2改性层,氧化温度为750℃。利用电化学腐蚀系统对改性层及基体在0.5 mol/L的H2SO4溶液中进行电化学对比实验。结果表明,不锈钢表面形成了致密、均匀的TiO2改性层,改性层由沉积层和扩散层组成,厚度约6μm;Ti-O改性层明显提高了不锈钢在0.5 mol/L的H2SO4溶液中的耐蚀性。

Ti surface modified layer was fabricated on stainless steel substrate at 950℃ by double glow discharge plasma surface alloying process, and then puting the titanizing sample in GSL-1600X high-temperature furnace and carrying out thermal oxidation at 750℃ ,TiO2 of rutile modified layer was formed on stainless steel. The electrochemical behavior of surface modified layer and untreated stainless steel were studied in 0.5mol/L H2SO4 solution.The results show that the modified layer TiO2 is uniform ,continuous and dense.The modified layer is composed of sedimentary layer and diffusion layer, its thickness is about 6μm. Ti-O surface modified layer can obviously improve the corrosion resistance of stainless steel in 0.5mol/L H2SO4 solution.