High-efficiency dual protection of photoelectrochemical cathodic protection coating with In2O3/C3N4/CNT nanocomposites for 304 stainless steel in marine environment

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-12 DOI:10.1016/j.conbuildmat.2024.139096

Xiaoying Zhang , Xiaoyuan Li , Xiaoqing Wang , Zuquan Jin

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引用次数: 0

Abstract

A photoelectrochemical cathodic protection coating with EP/In₂O₃/C₃N₄/CNT composite was designed and its anti-corrosion mechanism was further investigated. It was found that the introduction of In₂O₃/C₃N₄ not only densified the microporous structure but also enhanced the hydrophobicity, tensile strength and UV aging resistance of epoxy resin (EP) coatings, improving the physical shielding effects of the coating. In addition, the photogenerated electrons produced by In₂O₃/C₃N₄ nanocomposites could transfer to surface of 304 SS through the electronic transmission network of CNT under illumination. Owing to its dual protection, the corrosion current (I_corr) of 304 SS/EP/In₂O₃/C₃N₄/CNT reduced by 95.8 % and 67.8 % of that of 304SS and 304 SS/EP in dark, respectively. Under illumination, the OCP values of EP/In₂O₃/C₃N₄ and EP/In₂O₃/C₃N₄/CNT composite coatings were rapidly shifted negatively to −170 mV and −274 mV, respectively, which were both lower than the self-corrosion potential of 304 SS. Therefore, the introduction of optoelectronic nanoparticles into coatings is believed to be an effective strategy for providing dual protection for metals, which not only improved the physical shielding effects of the coating but also enhanced the photocathodic protection performance at the dark state.

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在海洋环境中使用 In2O3/C3N4/CNT 纳米复合材料对 304 不锈钢进行高效的光电阴极保护涂层双重保护

设计了一种 EP/In2O3/C3N4/CNT 复合材料光电阴极保护涂层，并进一步研究了其防腐机理。研究发现，In2O3/C3N4 的引入不仅使微孔结构致密化，还增强了环氧树脂（EP）涂层的疏水性、拉伸强度和抗紫外线老化性能，提高了涂层的物理屏蔽效果。此外，In2O3/C3N4 纳米复合材料产生的光生电子在光照下可通过 CNT 的电子传输网络传输到 304 SS 表面。在双重保护作用下，304 SS/EP/In2O3/C3N4/CNT 的腐蚀电流（Icorr）分别比 304SS 和 304 SS/EP 在黑暗条件下降低了 95.8% 和 67.8%。在光照下，EP/In2O3/C3N4 和 EP/In2O3/C3N4/CNT 复合涂层的 OCP 值迅速负移，分别为 -170 mV 和 -274 mV，均低于 304 SS 的自腐蚀电位。因此，在涂层中引入光电纳米粒子被认为是一种为金属提供双重保护的有效策略，它不仅提高了涂层的物理屏蔽效果，还增强了暗态下的光阴极保护性能。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.