Evaluation of the inhibition behavior of carbon dots on carbon steel in HCl and NaCl solutions

• DOI: 10.1016/j.jmst.2020.01.025
• Publication Date: 2020-01-08T21:42:42Z
• Authors: Yuwei Ye; Zilong Jiang; Yangjun Zou; Hao Chen; Shengda Guo; Qiumin Yang; Liyong Chen
• Keywords: Carbon steel; Langmuir adsorption model

Abstract An eco-friendly and effective corrosion inhibitor (N-CDs) was acquired by hydrothermal method in methacrylic acid and ethyl(methyl)amine precursors. Afterwards, the weight loss and electrochemistry measurement were chosen to appraise the corrosion inhibition behavior of as-prepared N-CDs for Q235 steel in Cl− contained solutions. The change rules of EIS and Tafel data displayed that the as-prepared N-CDs revealed a high-efficiency protection for steel in all test environments. Meanwhile, the inhibition efficiency of steel reached up to 93.93 % (1 M HCl) and 88.96 % (3.5 wt% NaCl) at 200 mg/L of N-CDs. Furthermore, the N-CDs could form the adsorption film on steel surface to avoid the strong attack of Cl−. By analysis, the adsorption mechanism of as-prepared N-CDs on steel surface was physicochemical interaction, which strictly complied with the Langmuir adsorption model in both solutions.