School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China.
School of Material and Chemical Engineering, Tongren University, Tongren 554300, China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China; Key Laboratory of Material Corrosion and Protection of Sichuan Province, Sichuan University of Science and Engineering, Zigong 643000, China.
J Colloid Interface Sci. 2022 Feb 15;608(Pt 2):2039-2049. doi: 10.1016/j.jcis.2021.10.160. Epub 2021 Oct 30.
N-doped carbon quantum dots (NCQDs) were synthesized by a hydrothermal method using folic acid and o-phenylenediamine as precursors. The inhibition behaviour of the NCQDs on Q235 steel in 1 M HCl solution was appraised through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves (PDP), and surface analysis. The results demonstrated that the synthesized NCQDs had an effective anticorrosion effect on Q235 steel, and the corrosion inhibition efficiency of 150 mg/L NCQDs reached 95.4%. Additionally, the analysis of the PDP corrosion potential changes indicated that the NCQDs acted as a mixed corrosion inhibitor. Moreover, the NCQDs adsorbed onto the surface of steel by coordinating its electron-rich atoms with the iron metal to form a protective film, which slowed the dissolution reaction of the anodic metal to achieve corrosion inhibition. The adsorption mechanism of the NCQDs was consistent with Langmuir adsorption, including physical and chemical adsorption. Therefore, this work can inspire and facilitate, to a certain extent, the future application of doped carbon quantum dots as efficient corrosion inhibitors in pickling solutions.
氮掺杂碳量子点（NCQDs）是通过水热法合成的，以叶酸和邻苯二胺为前驱体。通过电化学阻抗谱（EIS）、动电位极化曲线（PDP）和表面分析评价了 NCQDs 在 1 M HCl 溶液中对 Q235 钢的缓蚀行为。结果表明，合成的 NCQDs 对 Q235 钢具有有效的缓蚀作用，150 mg/L NCQDs 的缓蚀效率达到 95.4%。此外，PDP 腐蚀电位变化分析表明，NCQDs 作为一种混合腐蚀抑制剂发挥作用。此外，NCQDs 通过与铁金属的富电子原子配位吸附在钢表面上形成保护膜，从而减缓阳极金属的溶解反应，实现缓蚀。NCQDs 的吸附机制符合 Langmuir 吸附，包括物理吸附和化学吸附。因此，这项工作在一定程度上可以为掺杂碳量子点作为高效缓蚀剂在酸洗溶液中的未来应用提供启示和帮助。
