纳米钛酸锶薄膜电极的组装及其对不锈钢的光电化学缓蚀性能

Fabrication of SrTiO_3 Nanocrystalline Film Photoelectrode and Its Photoelectrochemical Anticorrosion Properties for Stainless Steel

研究了在铟锡氧化物(ITO)导电玻璃上组装的纳米钛酸锶薄膜光电极在模拟日光照射下对不锈钢的抗腐蚀保护性能.通过溶胶-凝胶法在添加和不添加十六烷基三甲基溴化铵(CTAB)表面活性剂的情况下制得了不同形貌的钛酸锶粉体.X射线衍射(XRD)和高分辨扫描电子显微镜(SEM)表征结呆表明,两种方法合成的钛酸锶均为钙钛矿型结构,但添加CTAB后得到的钛酸锶颗粒分散均匀,平均粒径为90 nm左右.采用紫外-可见漫反射光谱对钛酸锶薄膜的光物理性质进行了研究,发现其光吸收范围在紫外光区,而且通过CTAB协助合成的钛酸锶在小于380 nm光区较非CTAB协助合成的钛酸锶有更强的吸收.以0.1 mol·L^(-1)NaOH+0.2 mol·L^(-1)Na_2S溶液为光电极反应的电解质,测试了钛酸锶薄膜电极对304不锈钢在0.5 mol·L^(-1)的NaCI腐蚀溶液中的光电化学缓蚀性能.304不锈钢在CTAB改性钛酸锶薄膜光电化学保护或不保护条件在0.5 mol·L^(-1)NaCl+0.05 mol·L^(-1)HCl腐蚀溶液中腐蚀6h前后的表面金相图表明,钛酸锶薄膜具有优异的光电化学抗腐蚀性能.

The photoelectrochemical properties of a SrTiO3 film coated on an indium-tin oxide （ITO） conducting glass were investigated for the anticorrosion of 304 stainless steel （304SS） under solar light illumination. The SrTiO3 nanocrystal powders were synthesized using a sol-gel process in the absence and presence of the cetyltrimethyl ammonium bromide （CTAB） surfactant and characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. It was showed that the as-synthesized SrTiO3 materials exhibit a single perovskite structure and the presence of CTAB leads to uniform particles with an average size of 90 nm. The UV-Vis diffuse reflectance analysis shows that both SrTiO3 films that were prepared in the absence and presence of CTAB surfactant absorbs strongly in the UV region with an absorption threshold edge near 380 nm while the SiTiO3 prepared in the presence of CTAB exhibited a stronger absorption in the UV region than those in the absence of CTAB. The photo-electrochemical anticorrosion effects of SrTiO3 on 304 stainless steel substrates in a 0.5mol·L^-1 NaCl solution were investigated using a0.1 mol·L^-1 NaOH and 0.2mol·L^-1 Na2S hole sacrifice electrolyte solution. Metallographic images of the 304 stainless steel before and after immersion in a 0.5 mol·L^-1 NaCl＋0.05 mol·L^-1 HCI solution for 6 h demonstrates that the SrTiO3 film coated photoelectrode exhibits excellent photoelectrochemical anticorrosion performance on 304 stainless steel.