一种用于碳钢表面长期防腐的可持续动态氧化还原反应钝化膜。

A sustainable dynamic redox reaction passive film for long-term anti-corrosion of carbon steel surface.

作者信息

Fan Weihao, Wang Huaiyuan, Wang Chijia, Liu Zhanjian, Li Kaka, Zhu Yanji

机构信息

College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, PR China.

College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, PR China; School of Chemical Engineering and Technology, and State Key Laboratory for Chemical Engineering, Tianjin University, Tianjin 300350, PR China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, PR China.

出版信息

J Colloid Interface Sci. 2020 Nov 15;580:146-159. doi: 10.1016/j.jcis.2020.07.019. Epub 2020 Jul 10.

DOI:10.1016/j.jcis.2020.07.019

PMID:32683113

Abstract

CeO was used as the only oxidant for aniline polymerization, and polyaniline (PANI) was grown on CeO surface to form CeO@PANI nanocomposites. SEM and TEM showed that the CeO@PANI composites were nanorods in a core-shell structure. XPS indicated that CeO-core was reduced by aniline into Ce, which was then captured by the PANI-shell. Then the passive ability of CeO@PANI coating on steels was explored. EIS showed that the impedance modulus of the CeO@PANI coating exceeded 10 Ω·cm after accelerated immersion. The SVET and XPS confirmed that PANI polarized the anodic reaction, Ce suppressed the cathodic reaction, and PO formed complex precipitation. Some high-valent metal oxides can directly oxidize the aniline polymerization to form MO@PANI hybrid particles. The cations obtained by the metal oxide reduction can be captured by PANI and participate in passivation together with dopants. This study provides a new kind of nanocomposite fillers that can effectively passivate steel substrates within epoxy coatings for long-time protection.

摘要

CeO被用作苯胺聚合的唯一氧化剂，聚苯胺（PANI）在CeO表面生长以形成CeO@PANI纳米复合材料。扫描电子显微镜（SEM）和透射电子显微镜（TEM）表明，CeO@PANI复合材料为核壳结构的纳米棒。X射线光电子能谱（XPS）表明，CeO核被苯胺还原为Ce，然后被PANI壳捕获。然后研究了CeO@PANI涂层在钢上的钝化能力。电化学阻抗谱（EIS）表明，加速浸泡后CeO@PANI涂层的阻抗模量超过10 Ω·cm。扫描振动电极技术（SVET）和XPS证实，PANI使阳极反应极化，Ce抑制阴极反应，PO形成络合物沉淀。一些高价金属氧化物可以直接氧化苯胺聚合以形成MO@PANI杂化颗粒。金属氧化物还原得到的阳离子可以被PANI捕获，并与掺杂剂一起参与钝化。本研究提供了一种新型纳米复合填料，其可在环氧涂层内有效钝化钢基底以实现长期保护。