Corrosion-Protection of T122 Steel Using g-C3N5-Embedded Epoxy Coatings

IF 2.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials and Corrosion-werkstoffe Und Korrosion Pub Date : 2026-10-05 Epub Date: 2026-06-16 DOI:10.1002/maco.70185

Martha Patricia Hernández-Valencia, Tathagata Kar, Maura Casales-Díaz, José Juan Ramos-Hernández, América María Ramírez-Arteaga, José Gonzalo González-Rodríguez, Roy López-Sesenes, Mohan Kumar Kesarla

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Abstract

Corrosion-protection performance of a polymeric coating composed of g-C₃N₅ (CN) combined with epoxy (EP) on a T122 steel is systematically evaluated in two corrosive environments i.e., 3.5% NaCl and 0.1 M H₂SO₄. The electrochemical corrosion experiments suggest that the g-C₃N₅ concentration significantly affects the performance of EP towards the corrosion protection. The composite of EP containing 2% g-C₃N₅ (TEP2CN) exhibited the highest polarization/noise resistance values (R_p and R_n, respectively) and showed the best performance against corrosion. This is mostly attributed to the blockage of the pores in the EP by the low quantity of added g-C₃N₅ which subsequently prohibits the ionic diffusion to the T122 steel surface. However, upon increasing the g-C₃N₅-content to 5% (in TEP5CN), the protection performance degrades significantly because in this case, the coating partially delaminates facilitating the passage of the corrosive ions to diffuse through the coating to the T122 steel. The obtained electrochemical results suggest that the CN, when embedded in optimized quantity, can significantly improve the corrosion resistance of epoxy-based coatings.

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g- c3n5包埋环氧涂料对T122钢的防腐作用

在3.5% NaCl和0.1 M H2SO4两种腐蚀环境下，系统评价了g-C3N5 （CN）与环氧树脂（EP）复合聚合物涂层在T122钢表面的防腐性能。电化学腐蚀实验表明，g-C3N5浓度对EP的防腐性能有显著影响。含有2% g-C3N5 （TEP2CN）的EP复合材料具有最高的极化/噪声阻值（分别为Rp和Rn），并具有最佳的抗腐蚀性能。这主要是由于加入少量的g-C3N5堵塞了EP中的孔隙，从而阻止了离子扩散到T122钢表面。然而，当g- c3n5含量增加到5%（在TEP5CN中）时，防护性能显著下降，因为在这种情况下，涂层部分分层，有利于腐蚀离子通过涂层扩散到T122钢。得到的电化学结果表明，优化用量的CN可以显著提高环氧基涂层的耐蚀性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials and Corrosion-werkstoffe Und Korrosion 工程技术-材料科学：综合

CiteScore

3.70

自引率

11.10%

发文量

199

审稿时长

1.4 months

期刊介绍： Materials and Corrosion is the leading European journal in its field, providing rapid and comprehensive coverage of the subject and specifically highlighting the increasing importance of corrosion research and prevention. Several sections exclusive to Materials and Corrosion bring you closer to the current events in the field of corrosion research and add to the impact this journal can make on your work.