Electrochemical behavior of Zn-REP nanohybrid coatings during marine Shewanella sp. biofilm formation,Materials and Corrosion

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Electrochemical behavior of Zn-REP nanohybrid coatings during marine Shewanella sp. biofilm formation
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-01-11 , DOI: 10.1002/maco.202011997
Jonathan J. Calvillo Solís ₁ , Monica Galicia Garcia ₁

Affiliation

Nanohybrid coatings, particularly zinc-rich epoxy coatings, can protect steel from the harsh marine environment through a physical barrier mechanism and a cathodic protective effect based on anodic electrochemical reactions involving zinc particles in the coating. New additives, such as carbon nanotubes (CNTs), produce more efficient multifunctional coatings by enhancing both protective mechanisms. In this study, the electrochemical behavior and corrosion mechanisms of zinc-rich epoxy nanohybrid coatings with the addition of CNTs were investigated in the presence of a Shewanella sp. marine strain to evaluate their influence on biofilm formation by this Gram-negative bacterium. The electrochemical activity was monitored over time with open-circuit potential, electrochemical impedance spectroscopy, and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. A mixed mechanism was observed starting from early exposure. When the content of CNTs was doubled, the biofilm adherence improved, thus suggesting a favorable effect of CNTs on biofilm formation, attributable to increased production of bacterial exopolymeric substances facilitating biofilm development. The electrochemical impedance spectroscopy results suggested a correlation with biofilm formation as a second barrier layer with the lowest impedance magnitude in coatings with different multiwalled CNT content.

中文翻译：

海洋 Shewanella sp. 中 Zn-REP 纳米杂化涂层的电化学行为。生物膜形成

纳米混合涂层，特别是富锌环氧涂层，可以通过物理屏障机制和基于涂层中涉及锌颗粒的阳极电化学反应的阴极保护作用来保护钢免受恶劣的海洋环境的影响。新的添加剂，如碳纳米管 (CNT)，通过增强两种保护机制来生产更有效的多功能涂层。在这项研究中，研究了在Shewanella sp存在下添加 CNT 的富锌环氧纳米杂化涂层的电化学行为和腐蚀机理。. 海洋菌株评估它们对这种革兰氏阴性细菌形成生物膜的影响。使用开路电位、电化学阻抗谱、扫描电子显微镜和能量色散 X 射线光谱法随时间监测电化学活性。从早期暴露开始观察到混合机制。当 CNTs 的含量增加一倍时，生物膜的粘附性提高，因此表明 CNTs 对生物膜形成的有利影响，这归因于促进生物膜发育的细菌外聚合物的产生增加。电化学阻抗谱结果表明与生物膜形成相关，作为具有不同多壁 CNT 含量的涂层中阻抗幅度最低的第二阻挡层。

更新日期：2021-01-11

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