氮掺杂石墨烯量子点作为新型碳钢缓蚀剂:从设计到机理

doi:10.11896/cldb.23100196

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Abstract Corrosion inhibitors are widely used in the field of metal corrosion protection due to their advantages of low cost and easy operation. Graphene quantum dots (GQDs), as a novel carbon-based nanomaterial, have been employed as corrosion inhibitors for carbon steel, but their corrosion inhibition performance is still unsatisfactory. In this work, N doping GQDs (N-GQDs) are designed and prepared as novel corrosion inhibitors for carbon steel;their excellent corrosion inhibition performance is demonstrated, and the related inhibiting mechanism is revealed. Specifically, density functional theory (DFT) and molecular dynamics (MD) simulations are adopted to design N-GQDs as corrosion inhibitors. The designed N-GQDs are prepared by a one-step hydrothermal method. Ultraviolet-visible (UV-Vis) spectra and photoluminescence (PL) spectra are utilized to confirm the dispersion stability of the prepared N-GQDs. The corrosion inhibition behaviors of N-GQDs for carbon steel in 1 mol/L HCl solution are investigated by weight loss test and electrochemical test. The corrosion inhibition mechanism of N-GQDs is revealed by combining adsorption isotherm with corrosion surface analyses. The results show that N doping makes it easier for N-GQDs to adsorb on the surface of carbon steel, endowing them with better corrosion inhibition potential. A large number of groups exist on the surface of N-GQDs, making them possess good long-term dispersion stability in HCl solution. The corrosion inhibition efficiency of 200 mg/L N-GQDs for Q235 carbon steel after 96 h immersion in 1 mol/L HCl solution is as high as 90.48%, evidencing the excellent long-term corrosion inhibition ability of N-GQDs. The corrosion inhibition mechanism of N-GQDs is attributed to the physical and chemical adsorption of N-GQDs on the carbon steel surface. This work is expected to provide a reference for the design and preparation of new green corrosion inhibitors.

Key words： graphene quantum dots (GQDs) N doping hydrochloric acid (HCl) corrosion inhibition performance carbon steel adsorption

Published: 10 April 2025 Online: 2025-04-10

CLC number:

TG174

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	Articles by authors
	LONG Wujian
	TANG Yi
	ZHENG Shuyi
	HE Chuang

Cite this article:

LONG Wujian,TANG Yi,ZHENG Shuyi, et al. N-GQDs as Novel Corrosion Inhibitors for Carbon Steel:from Design to Mechanism[J]. Materials Reports, 2025, 39(7): 23100196-10.

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https://www.mater-rep.com/EN/10.11896/cldb.23100196 OR https://www.mater-rep.com/EN/Y2025/V39/I7/23100196

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