氮掺杂石墨烯量子点作为新型碳钢缓蚀剂:从设计到机理  

N-GQDs as Novel Corrosion Inhibitors for Carbon Steel:from Design to Mechanism

作　　者：龙武剑[1,2,3] 唐懿 郑淑仪 何闯 LONG Wujian;TANG Yi;ZHENG Shuyi;HE Chuang(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China;Guangdong Province Key Laboratory of Durability for Marine Civil Engineering,Shenzhen 518060,Guangdong,China;Shenzhen Key Laboratory for Low-carbon Construction Material and Technology,Shenzhen 518060,Guangdong,China;School of Civil Engineering and Architecture,Taizhou University,Taizhou 318000,Zhejiang,China)

机构地区：[1]深圳大学土木与交通工程学院,广东深圳518060 [2]广东省滨海土木工程耐久性重点实验室,广东深圳518060 [3]深圳市低碳建筑材料与技术重点实验室,广东深圳518060 [4]台州学院建筑工程学院,浙江台州318000

出　　处：《材料导报》2025年第7期154-163,共10页Materials Reports

基　　金：国家自然科学基金-山东联合基金(U2006223);台州市科技局项目(23sfa03)。

摘　　要：缓蚀剂具有成本低、操作简便等优点,广泛应用于金属腐蚀防护领域。石墨烯量子点(GQDs)作为一种新型碳基纳米材料,已被用作碳钢缓蚀剂,但其缓蚀性能仍不理想。本工作设计制备了一种N掺杂GQDs(N-GQDs)作为新型碳钢缓蚀剂,证明了其优异的缓蚀性能,并揭示了其缓蚀机理。具体而言,采用密度泛函理论(DFT)和分子动力学(MD)模拟,设计N-GQDs作为缓蚀剂;采用一步水热法制备出所设计的N-GQDs;采用紫外可见(UV-Vis)光谱和荧光(PL)光谱证实所制备N-GQDs的分散稳定性;采用失重试验和电化学测试探究N-GQDs在1 mol/L HCl溶液中对碳钢的缓蚀性能;结合吸附等温线和腐蚀面分析,揭示N-GQDs缓蚀机理。结果表明,N掺杂使N-GQDs更易吸附在碳钢表面,使其具有更出色的缓蚀能力;N-GQDs表面存在大量基团,使其在HCl溶液中具有良好的长期分散稳定性;200 mg/L N-GQDs对在1 mol/L HCl溶液中浸泡96 h后的Q235碳钢的缓蚀效率高达90.48%,展示出优异的长期缓蚀能力;N-GQDs的缓蚀机理归因于N-GQDs在碳钢表面的物理吸附和化学吸附。本工作有望为新型绿色缓蚀剂的设计和制备提供参考。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.

关 键 词：石墨烯量子点(GQDs) N掺杂 盐酸(HCl) 缓蚀性能 碳钢 吸附 

分 类 号：TG174[金属学及工艺—金属表面处理]