Corrosion mechanism and resistance of g-C3N5@PDA nanosheets modified epoxy-coated carbon steel

IF 6.5 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-01-05 DOI:10.1016/j.porgcoat.2024.109048

Fujian Tang , Yongde Yao , Shangtong Yang

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Abstract

Nitrogen-rich carbon nitride (g-C₃N₅) nanosheets were modified with polydopamine (PDA) and then incorporated into an epoxy resin (EP) matrix to create a g-C₃N₅@PDA modified epoxy (GP/EP) coating. The phase composition, microstructure, and mechanical properties were analyzed using X-ray diffraction, scanning electron microscopy, and nano-indentation. The corrosion behavior was investigated by applying the coating to a steel plate and immersing it in a NaCl solution for 20 days using electrochemical impedance spectroscopy and potentiodynamic polarization tests. Molecular dynamics simulations were also conducted to elucidate the corrosion mechanism. The results indicated that the hardness and elastic modulus of the epoxy coating increased from 0.02 GPa to 0.26 GPa and from 0.92 GPa to 2.90 GPa, respectively, after the modification of g-C₃N₅ nanosheets with PDA. Additionally, the corrosion current density of the GP/EP-coated steel plate was measured at 0.51 μA/cm², which is approximately 17 times lower than that of the EP-coated plate when immersed in a 3.5 wt% NaCl solution.

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.

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