Chu Qingkai, Yang Haobing, Liu Zhixiong, Li Xiaofan, Niu Guoyan, Zhang Jin, Zhang Xianhui, Li Yong, Ye Yuwei
School of Chemistry and Chemical Engineering, Shanxi Provincial Key Laboratory of Chemical Biosensing, Shanxi Datong University, Datong 037009, China.
Fujian Province Key Laboratory of Naval Architecture and Marine Engineering, School of Marine Engineering, Jimei University, Xiamen 361021, PR China.
Langmuir. 2024 Jun 18;40(24):12526-12538. doi: 10.1021/acs.langmuir.4c00932. Epub 2024 Jun 5.
l-cysteine, as an eco-friendly and nontoxic corrosion inhibitor, was directly covalently linked to the carbon/carbon double bonds of the GO flakes by a thiol-ene click reaction to avoid decreasing the number of hydrophilic oxygen-containing polar functionalities. The corrosion inhibition performances of Cys-GO toward Q235 steel (QS) in diluted hydrochloric acid were studied by electrochemical methods. The corrosion was a charge transfer-controlled process, and Cys-GO manifested as a mixed-type corrosion inhibitor. The corrosion inhibition efficiency (η) for QS showed a first-increase-and-then-decrease trend with increasing Cys-GO concentrations. The optimum concentration of Cys-GO was 15 mg L, and the according η value was up to 90%. The Cys-GO adsorbed on the QS surface to form a protective barrier was responsible for the efficient corrosion inhibition. Langmuir adsorption isotherm model was fitted well with the experiment data, indicating a monolayer adsorption. Furthermore, the coordinate covalent bonds, π-back-donation effect, and electrostatic attraction were responsible for the Cys-GO adsorption on the QS surface.
L-半胱氨酸作为一种环保且无毒的缓蚀剂，通过硫醇-烯点击反应直接与氧化石墨烯片层的碳/碳双键共价连接，以避免亲水性含氧极性官能团数量减少。采用电化学方法研究了半胱氨酸-氧化石墨烯（Cys-GO）在稀盐酸中对Q235钢（QS）的缓蚀性能。腐蚀是一个电荷转移控制过程，Cys-GO表现为混合型缓蚀剂。随着Cys-GO浓度增加，QS的缓蚀效率（η）呈先升高后降低的趋势。Cys-GO的最佳浓度为15 mg/L，相应的η值高达90%。吸附在QS表面形成保护屏障的Cys-GO是高效缓蚀的原因。Langmuir吸附等温线模型与实验数据拟合良好，表明为单分子层吸附。此外，配位共价键、π-反馈给电子效应和静电引力是Cys-GO吸附在QS表面的原因。
