不锈钢基板上电聚合聚（邻甲苯胺-共多巴胺）膜的电化学行为和耐蚀性

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces Pub Date : 2025-09-23 DOI:10.1016/j.surfin.2025.107739

Xing Huang , Kai Huang , Huan Xiang , Yao Tan , Huawei Yin , Chengli Tang , Tingzhen Li , Chuanbo Hu

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引用次数: 0

摘要

本研究以邻甲苯胺和盐酸多巴胺为共聚单体，在硫酸介质中用循环伏安法成功地在304不锈钢衬底上电沉积了聚（邻甲苯胺）和聚（多巴胺）（POT-co-PDA）共聚物。紫外-可见（UV-vis）吸收光谱和傅里叶变换红外（FTIR）光谱的表征结果证实了共聚物的成功合成。扫描电子显微镜（SEM）分析显示，与均聚物的多孔结构相比，POT-co-PDA共聚物薄膜表现出更致密、更连续的表面形貌，表明多巴胺的加入有效地改善了薄膜的微观结构。通过在3.5% NaCl溶液中的加速浸泡试验，评价了镀层的电化学腐蚀性能。最初，Tafel极化曲线测量表明，POT和POT-co- pda涂层都显著提高了不锈钢基体的耐腐蚀性。值得注意的是，该涂层表现出优异的保护性能，腐蚀速率低至0.009 mm/年，对基体的保护效率为92.64%。电化学阻抗谱（EIS）结果表明，该涂层的电荷转移电阻（Rct）值分别是POT均聚物涂层和裸钢基体的3.5倍和6.8倍。这进一步证实了其显著增强的长期屏障防护能力。高分子共聚物中多巴胺单元的多功能作用，显著提高了聚合物的防腐性能。这些单元协同增强了涂层的物理阻隔性能和电化学钝化能力。关键机制包括增强界面粘附，增加薄膜致密性，以及PDA中儿茶酚基团促进的钝化作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Electrochemical behavior and corrosion resistance of the electropolymerized poly(o-toluidine-co-dopamine) film on stainless steel substrates

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Electrochemical behavior and corrosion resistance of the electropolymerized poly(o-toluidine-co-dopamine) film on stainless steel substrates

This study successfully electrodeposited a copolymer of poly(o-toluidine) and poly(dopamine) (POT-co-PDA) onto 304 stainless steel substrates using cyclic voltammetry in a sulfuric acid medium, employing o-toluidine and dopamine hydrochloride as comonomers. Characterization results from ultraviolet-visible (UV–vis) absorption spectroscopy and Fourier transform infrared (FTIR) spectroscopy confirmed the successful synthesis of the copolymer. Scanning electron microscopy (SEM) analysis revealed that the POT-co-PDA copolymer film exhibited a denser and more continuous surface morphology compared to the porous structure of the homopolymer, indicating that the incorporation of dopamine effectively refined the film's microstructure. The electrochemical corrosion performance of the coatings was evaluated through accelerated immersion tests in a 3.5 % NaCl solution. Initially, Tafel polarization curve measurements demonstrated that both POT and POT-co-PDA coatings significantly enhanced the corrosion resistance of the stainless steel substrate. Notably, the POT-co-PDA coating exhibited superior protective performance, achieving a corrosion rate as low as 0.009 mm/year and a protection efficiency of 92.64 % for the substrate. Furthermore, electrochemical impedance spectroscopy (EIS) results revealed that the charge transfer resistance (R_ct) value of the POT-co-PDA coating was 3.5 times and 6.8 times higher than that of the POT homopolymer coating and the bare steel substrate, respectively. This further confirms its significantly enhanced long-term barrier protection capability. The markedly improved corrosion protection performance of the POT-co-PDA coating primarily stems from the multifunctional role of the dopamine units within the copolymer. These units synergistically enhance the coating's physical barrier properties and electrochemical passivation capabilities. Key mechanisms include enhanced interfacial adhesion, increased film compactness, and the passivation effect facilitated by the catechol groups in PDA.

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来源期刊

Surfaces and Interfaces Chemistry-General Chemistry

CiteScore

8.50

自引率

6.50%

发文量

753

审稿时长

35 days

期刊介绍： The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)