Investigation of the anti-corrosive effect of tannic acid embedded in silica coatings on Zn substrates

Proceedings of 1st Corrosion and Materials Degradation Web Conference Pub Date : 2021-05-13 DOI:10.3390/cmdwc2021-10035

J. Both, G. Szabó, L. Muresan

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Abstract

Abstract: The replacement of environmentally harmful chromate coatings has been of great interest to the electrochemical industry. Compact silica coatings are a widely discussed inorganic coating alternative, to replace previously used toxic materials. Silica offers a feasible and simple method of passive corrosion protection, with the option of enhancement by incorporating different inhibitors into the matrix. Tannic acid is a non-toxic substance, that acts as cathodic corrosion inhibitor, by forming metal-tannate protective barriers. [1,2] The present study discusses the addition of different concentrations of tannic acid in nano-scale silica coatings, which were prepared by sol-gel technique and dip-coating method on Zn substrates. Long term corrosion measurements were carried out on the prepared substrates to check their durability and corrosion resistance. The thin layers were characterized by Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic Polarization Curves. It has been concluded that silica coatings containing tannic acid show promising EIS values and corrosion current densities, compared to the simple silica coatings. References: [1] E.Kushimerek, E. Chrzescijanska, Mater. Corros., 2015, 66(2), 169-174. [2] B. Qian, B. Han, M. Zheng, Corros. Sci., 2013, 72, 1-9.

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锌基二氧化硅涂层中单宁酸的防腐效果研究

摘要:替代对环境有害的铬酸盐涂层一直是电化学行业关注的热点。紧凑的二氧化硅涂料是一种广泛讨论的无机涂料替代品，以取代以前使用的有毒材料。二氧化硅提供了一种可行且简单的被动腐蚀保护方法，可以通过在基体中加入不同的抑制剂来增强。单宁酸是一种无毒物质，通过形成金属-单宁酸保护屏障，起到阴极缓蚀剂的作用。[1,2]本研究讨论了溶胶-凝胶法和浸涂法在锌基上制备纳米二氧化硅涂层时，加入不同浓度的单宁酸。对制备的基材进行了长期腐蚀测量，以检查其耐久性和耐腐蚀性。利用电化学阻抗谱(EIS)和动电位极化曲线对薄膜进行了表征。结果表明，含单宁酸的氧化硅涂层与普通氧化硅涂层相比，具有良好的EIS值和腐蚀电流密度。参考文献:[1]E. kushimerek, E. Chrzescijanska, Mater。Corros。浙江农业学报，2015,66(2)，169-174。[2]钱斌，韩斌，郑明，等。科学。， 2013, 72, 1-9。

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Proceedings of 1st Corrosion and Materials Degradation Web Conference

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