Structure and performance insights in La modified carbon quantum dots-epoxy coating with efficiency corrosion and wear resistance

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-04-05 DOI:10.1016/j.surfcoat.2025.132108

Qi Zeng , Haitao Yin , Qunfang Li , Ihor I. Bulyk , Zhixiang Wang , Shengguo Zhou

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引用次数: 0

Abstract

Epoxy resin is a very versatile material but has limited corrosion and wear resistance. Carbon quantum dots are a new type of corrosion inhibitor material with good dispersibility. In this paper, lanthanum nitrate, ethylenediamine and citric acid were mixed to prepare lanthanum‑nitrogen doped carbon quantum dots (La/N-CQDs) by a hydrothermal method, which could show good dispersion and compatibility in epoxy resin. Meanwhile, a series of La/N-CQDs modified La/N-CQDs@EP coatings with long-term corrosion resistance and friction reduction were successfully prepared on the NdFeB surface by spin-coating method. The results of electrochemical tests and tribological tests show that the La/N-CQDs doped EP composite coatings could effectively enhance the anti-corrosion and anti-wear protection to the NdFeB surface. The La/N-CQDs@EP composite coating doped with 2 wt% La/N-CQDs showed the lowest corrosion current density and remained the highest impedance modulus after 14 days of immersion in 3.5 wt% NaCl solution. While the La/N-CQDs@EP composite coating doped with 1.5 wt% La/N-CQDs possess relatively low friction coefficient and wear rate. The excellent corrosion protection and wear resistance of the La/N-CQDs@EP coatings were mainly due to the enhanced interfacial bonding, and improved the densification of the epoxy resin structure. These indicated that La/N-CQDs modified EP composite coatings could effectively control the corrosion and wear loss of NdFeB in some harsh environments.

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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.