Gad Shedrack Musa, Jin Zelong, Emad Seydgholamreza, Vergara Javier Espinoza, Yawas Danjuma Saleh, Dagwa Ishaya Musa, Momoh-Bello Omiogbemi Ibrahim
Corrosion and Protection Centre, School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
Departamento de Los Materiales, University of Santiago of Chile, Chile.
Heliyon. 2023 Mar 22;9(3):e14693. doi: 10.1016/j.heliyon.2023.e14693. eCollection 2023 Mar.
In this study, the anticorrosion potential of carboxylic compounds; Lanthanum 4-hydroxycinnamate La(4OHCin), Cerium 4-hydroxycinnamate Ce(4OHCin) and Praseodymium 4-hydroxycinnamate Pr(4OHCin) for the protection of Al-Cu-Li alloy was investigated in 3.5% NaCl solution using electrochemical tests (EIS and PDP), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The findings achieved show a very good correlation between electrochemical responses and surface morphologies of the exposed alloy, indicating a modification of the surface by precipitation of the inhibitor species, leading to effective protection against corrosion. At optimum concentration 200 ppm, the trend of inhibition efficiency η (%) increases in the order Ce(4OHCin) 93.35% > Pr(4OHCin) 85.34% > La(4OHCin) 82.25%. XPS complemented the findings by detecting and providing information about the oxidation states of the protective species.
在本研究中，使用电化学测试（电化学阻抗谱和动电位极化曲线）、扫描电子显微镜和X射线光电子能谱，研究了羧酸化合物镧4-羟基肉桂酸酯（La(4OHCin)）、铈4-羟基肉桂酸酯（Ce(4OHCin)）和镨4-羟基肉桂酸酯（Pr(4OHCin)）在3.5%氯化钠溶液中对Al-Cu-Li合金的防腐潜力。研究结果表明，暴露合金的电化学响应与表面形貌之间具有很好的相关性，这表明抑制剂物种沉淀对表面进行了改性，从而有效防止了腐蚀。在最佳浓度200 ppm时，缓蚀效率η(%)的趋势为Ce(4OHCin) 93.35% > Pr(4OHCin) 85.34% > La(4OHCin) 82.25%。X射线光电子能谱通过检测并提供有关保护物种氧化态的信息，对研究结果进行了补充。
