T iO2 /316L不锈钢薄膜电极在NaC l溶液中的耐腐蚀性能
Corrosion Resistance for T iO2 Th in F ilms Coated 316LSta in less Steel in theNaC l Solution
- 化学化工－已发表论文 
[中文文摘]应用sol gel法和提拉技术于 316L不锈钢表面构筑纳米TiO2薄膜,再经水热后处理以消除膜中的细小龟裂.SEM和XRD技术表征膜的形貌和厚度,线性极化法分别考察膜厚度、pH、和Cl浓度对纳米膜电极耐腐蚀性能影响.电化学交流阻抗检测纳米TiO2膜在 0. 5mol/LNaCl溶液中的阻抗随浸泡时间的变化,光电子能谱技术测定了经浸泡 1008h后的纳米膜中各元素相对百分含量和价态.结果表明:在中性或碱性条件下,厚度为 375~464nm的纳米膜其耐腐蚀性随浸泡时间的延长呈现初期增加而后稳定,浸泡 48h后腐蚀电流较之浸泡初期降低 2个数量级,耐腐蚀电阻增加 2个数量级,在浸泡 1 008h内没有发现腐蚀的产物,Fe是以原子态扩散到膜中.[英文文摘]The nano-TiO2 thin films have been deposited on the 316L stainless steel by so-lgel and the dipcoating methods. Hydrothermal pos-t treatment leads to crack-free coatings. Meanwhile, the surface structure and properties are optimized. Surface morphology, structure and properties are characterized by XRD, and SEM techno log ies. The results have shown that the surface o f coatings is porous, uniform and orderly, the partic le diameters are in the range of 15~ 18nm and the pores are about 4~ 8nm and TiO2 is anatase. The results of electrochemical measurements show that in the NaC l solution with pH ≥ 2 and concen trat ion below 1mo l/L, the nano-T iO2 coatings with thinkness 375~ 464nm have most excellen tanticorrosion properties. Compareing with bare 316L stainless steel the corrosion current for coating electrodes in 0. 5mo l/L NaC l solution has cut down 2 magnitude and the corrosion resistance Rp has also decreased nearly 2 magnitude.