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

doi:10.11901/1005.3093.2020.154

材料研究学报

2021, Vol. 35

Issue (1): 7-16 DOI: 10.11901/1005.3093.2020.154

研究论文

本期目录 | 过刊浏览

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

张大磊(

), 魏恩泽, 荆赫, 杨留洋, 豆肖辉, 李同跃

中国石油大学(华东)材料科学与工程学院青岛 266580

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

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

引用本文:

张大磊, 魏恩泽, 荆赫, 杨留洋, 豆肖辉, 李同跃. 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[J]. 材料研究学报, 2021, 35(1): 7-16.
Dalei ZHANG, Enze WEI, He JING, Liuyang YANG, Xiaohui DOU, Tongyue LI. Construction of Super-hydrophobic Structure on Surface of Super Ferritic Stainless Steel B44660 and Its Corrosion Resistance[J]. Chinese Journal of Materials Research, 2021, 35(1): 7-16.

全文: PDF(19613 KB) HTML

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。

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

Abstract：

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.

Key words： materials failure and protection super hydrophobic film dopamine self-polymerization super ferritic stainless steel corrosion behavior

收稿日期: 2020-05-08

ZTFLH:

TG174.4

基金资助: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)

作者简介: 张大磊，男，1983年生，讲师

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.154 或 https://www.cjmr.org/CN/Y2021/V35/I1/7

表1 SFSS的化学成分组成

表2 主要实验试剂

表3 修饰前B44660试样的平均粗糙度

图1 SFSS/PDA/PFDT和SFSS/PDA/ODA的制备过程示意图

图2 SFSS/PDA/ODA和SFSS/PDA/PFDT表面的宏观形貌

图3 SFSS/PDA/ODA和SFSS/PDA/PFDT的SEM和EDS分析

图4 B1-B4组不同粗糙度SFSS/PDA/ODA和SFSS/PDA/PFDT的平均水接触角

图5 修饰前不同时间段SFSS-B44660 (a, b, c)和SFSS/PDA/PFDT(d, e, f)表面在体式显微镜下的水雾凝聚状态

图6 修饰前的超铁B44660和SFSS/PDA/PFDT在荧光显微镜下微生物附着图

图7 修饰前SFSS B44660，SFSS/PDA/ODA和SFSS/PDA/PFDT在3.5%NaCl水溶液中的极化曲线

表4 修饰前超铁B44660和修饰后的SFSS/PDA/ODA、SFSS/PDA/PFDT在3.5%NaCl水溶液中的电化学拟合参数

图8 修饰前超铁B44660和修饰后SFSS/PDA/ODA和SFSS/PDA/PFDT浸泡在3.5%NaCl水溶液中的电化学阻抗谱图

图9 等效电路图：(a)修饰前超铁B44660; (b) SFSS/PDA/PFDT和SFSS/PDA/ODA

表5 修饰前超铁B44660，SFSS/PDA/ODA 和SFSS/PDA/PFDT浸泡在3.5%NaCl水溶液中的阻抗谱拟合参数

图10 普通浸泡实验前后试样表面的微观形貌

图11 SFSS涂层腐蚀机理示意图

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