高校化学工程学报2017，Vol.31Issue(5)：1177-1185,9.DOI:10.3969/j.issn.1003-9015.2017.05.022
316 L不锈钢表面不同涂层的制备以及在超临界水中腐蚀特性研究
Preparation of Different Coatings on 316 L Stainless Steel and their Corrosion Performance in Supercritical Water
摘要
Abstract
In order to solve corrosion problems of metal materials during supercritical water oxidation (SCWO) processes, Al2O3, ZrO2 and TiO2 coatings with thickness of 0.2 mm were prepared on the surface of 316L stainless steel by atmospheric plasma spraying (APS). Corrosion of the coated samples was evaluated in a batch reactor at 500 ℃ and 25 MPa with an oxygen concentration of 1000 mg.L-1 for 80 h. The adhesive strength of the coated samples was tested, and the surface and cross-section morphologies along with element distributions of fresh and corroded samples were analyzed. The results show that the adhesive strength of the Al2O3, ZrO2, and TiO2 coatings is 26.639, 24.526 and 40.607 N.mm-2, respectively. The surface morphology of Al2O3/316 L show gully erosion with many pores and cracks after being exposed in SCW, and most of the coating can be peeled off. The original dense ZrO2 coating becomes fragmented in supercritical water, and the residual thickness of the coating is ~ 0.15 mm. The surface morphology of TiO2 coating is relatively dense and the thickness of the coating is not decreased obviously in supercritical water. The TiO2 coating exhibits better corrosion resistance compared with the Al2O3 and ZrO2 coatings. The results provide a new approach for corrosion prevention of metal materials during SCWO processes.关键词
超临界水/腐蚀/316L不锈钢/涂层/Al2O3/ZrO2/TiO2Key words
supercritical water/corrosion/316 L stainless steel/coating/Al2O3/ZrO2/TiO2分类
矿业与冶金引用本文复制引用
王玉珍,高芬,杨健乔,李婧,朱怡彤,方长青,王树众..316 L不锈钢表面不同涂层的制备以及在超临界水中腐蚀特性研究[J].高校化学工程学报,2017,31(5):1177-1185,9.基金项目
陕西省教育厅自然专项项目(17JK0566). （17JK0566）
