Unfolding mechanism of functionalized graphene in epoxy coating with enhanced corrosion protection properties in H2SO4 solution

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2025-02-12 DOI:10.1016/j.surfcoat.2025.131914

Kaixin Xu , Wen Sun , Lida Wang , Zhengqing Yang , Yine Ren , Yanjia Yang , Guichang Liu

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Abstract

Unfolding graphene is beneficial for improving coatings properties. However, the unfolding mechanism of functionalized graphene remains poorly understood. Herein, the precise unfolding mechanism of 3-aminopropyl triethoxysilane functionalized reduced graphene oxide (rGO_A) and the corrosion protection properties of its composite coatings (rGO_A-EP) are investigated. Experimental results reveal that, compared to conventional graphene/epoxy coating, rGO_A-EP increases coating resistance by 4–5 orders of magnitude in H₂SO₄ solutions, due to the enhanced labyrinth effect achieved through unfolding rGO_A embedded in coatings. Then, it is investigated by molecular simulation via molecular dynamic simulation and density functional theory (DFT) calculations, and the results further demonstrated that the unfolding of rGO_A is related to uniform charge distribution within its basal plane, and the priority for improving corrosion protection properties of rGO_A-EP in H₂SO₄ solutions is unfolding the graphene, followed by the interaction between fillers and epoxy coatings, and the protonation of –NH₂ on the graphene.

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.