超级铁素体不锈钢表面超疏水结构的制备及其耐腐蚀性能  

Construction of Super-hydrophobic Structure on Surface of Super Ferritic Stainless Steel B44660 and Its Corrosion Resistance

作　　者：张大磊 魏恩泽 荆赫 杨留洋 豆肖辉 李同跃 ZHANG Dalei;WEI Enze;JING He;YANG Liuyang;DOU Xiaohui;LI Tongyue(School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)材料科学与工程学院,青岛266580

出　　处：《材料研究学报》2021年第1期7-16,共10页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51774314);山东省自然科学基金(ZR2018MEM002);中央高校自主创新科研计划项目(19CX05001A)。

摘　　要：将多巴胺的自发聚合反应与低表面能物质ODA和PFDT结合,在超级铁素体不锈钢表面制备了均匀致密的超疏水薄膜。用水雾凝聚实验、扫描电子显微镜(SEM)和X射线能谱分析(EDS)等手段表征了涂层修饰前后的润湿性、表面形貌以及化学结构,并使用三电极体系电化学工作站测试了超级铁素体不锈钢表面修饰前后涂层的阻抗谱和极化曲线。结果表明:修饰前超级铁素体不锈钢涂层表现为亲水性,修饰后表面有超疏水薄膜的超级铁素体不锈钢具有更低的腐蚀电流密度和更高的涂层电阻,修饰处理能明显提高超级铁素体不锈钢涂层的防腐蚀性。在涂层表面形成的超疏水膜具有"微纳米结构空气谷",阻碍了强腐蚀性氯离子在溶液与固体界面间的扩散和迁移界面电化学反应腐蚀产物的脱落与溶解,提高了电荷转移电阻,降低了电流腐蚀密度,从而提高了涂层的防腐蚀性。A uniform and dense superhydrophobic film on the surface of super ferritic stainless steel B44660 was prepared via spontaneous polymerization of dopamine in the presence of low surface energy substances ODA and PFDT. Then the wettability, surface morphology and chemical structure of the steel with simple-and modified-dopamine coatings were characterized by means of water spray condensation experiment, scanning electron microscope(SEM), X-ray energy spectrum analysis(EDS), impedance spectroscopy and polarization curve tests. The results show that the super ferritic stainless steel with simple dopamine coating is hydrophilic, and however the super ferritic stainless steel surface with super hydrophobic coating has lower corrosion current density and higher coating resistance, the modification treatment can obviously improve the corrosion resistance of the simple dopamine coating on super ferritic stainless steel surface. The super-hydrophobic film formed on the surface of the simple dopamine coating presents large amount of "micro-nano structured air valleys", which prevents the diffusion of strongly corrosive chloride ions between the solution and the solid interface and the electrochemical reaction of the interface. Therefore, the corrosion current density is reduced, correspondingly improving the corrosion resistance of the coating.

关 键 词：材料失效与保护 超疏水薄膜 多巴胺自聚合 超级铁素体不锈钢 腐蚀行为 

分 类 号：TG174.4[金属学及工艺—金属表面处理]