Sm掺杂TiO_2涂层对301不锈钢光生阴极保护研究

Photogenerated Cathodic Protection Properties of Sm-doped TiO_2 Coatings on 301 Stainless Steel

以钛酸丁酯为原料,采用溶胶凝胶-浸渍提拉法在301不锈钢表面制备了纯TiO_2涂层与不同浓度Sm掺杂TiO_2涂层,采用SEM、EDS、XRD等测试方法对涂层进行了表面形貌、元素组成、晶体结构等表征,采用电化学工作站研究了涂层对301不锈钢的光生阴极保护作用。结果表明:涂层由TiO_2颗粒覆盖,Sm掺杂涂层更加均匀致密;纯TiO_2与Sm掺杂TiO_2均为锐钛矿结构,Sm掺杂有晶粒细化的作用;在光照条件下涂层有光生阴极保护作用,Sm掺杂后的保护作用高于纯TiO_2涂层,在掺杂浓度为2.4%时,保护效果最好。

The pure and Sm-doped（0.8, 1.6, 2.4, 3.2 at%） TiO; coatings were synthesized on 301 stainless steel by sol-gel and dip-coating method with tetrabutyl titanate as the raw material. The surface morphology, element composition and crystal structure of the prepared coatings was characterized by SEM, EDS, and XRD respectively. The influence of coatings on photogenerated cathodic protection of 301 stainless steel was investigated by electrochemical workstation. The results reveal that the coatings consist of TiO2 particles and the coating doped with Sm is more homogeneous. The crystal structure of pure TiO~ and Sin-doped TiO2 are both anatase and the grain size of TiO2 is reduced by Sm doping. Sm-doped TiO2 coatings are able to create better photogenerated cathodic protection effect than pure TiO2 coating under the condition of illumination. TiO2 coating doped with Sm in the amount of 2.4 at% shows the best protection effect.