N-GQDs as Novel Corrosion Inhibitors for Carbon Steel:from Design to Mechanism
LONG Wujian1,2,3, TANG Yi1,2, ZHENG Shuyi1,2,3, HE Chuang4,*
1 College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China 2 Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Shenzhen 518060, Guangdong, China 3 Shenzhen Key Laboratory for Low-carbon Construction Material and Technology, Shenzhen 518060, Guangdong, China 4 School of Civil Engineering and Architecture, Taizhou University, Taizhou 318000, Zhejiang, China
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.
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2025, Vol. 39 
