Abstract The corrosion protection mechanism of 2-mercaptobenzothiazole (2-MBT) and its potential synergistic effect with cerium chloride (CeCl3) for sustainability of the aerospace alloy AA 2024-T3 was investigated. The corrosion inhibitors 2-MBT and CeCl3 and their potential synergistic properties were assessed with image-assisted electrochemical noise, the split-cell technique, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) observations. It is suggested that 2-MBT inhibits the dealloying of S-phase particles and prevents the formation of Cu-rich particles on the surface of AA 2024-T3. 2-MBT protects the second phase particles from corrosion and offers sustainability in 3.5% NaCl solution by formation of a protective layer on the surface of AA 2024-T3. Additionally, 2-MBT is adsorbed on the surface of AA 2024-T3 during anodic dissolution of aluminium. A synergistic effect between 2-MBT and the Ce3+ based corrosion inhibitor was not found. It is suggested that 2-MBT protects the intermetallic particles from corrosion from the early immersion time and blocks the precipitation of cerium hydroxides over the second phase particles. 2-MBT revealed better corrosion protection properties compared with CeCl3 and 2-MBT + CeCl3 in the tested time scale.

中文翻译：

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2-巯基苯并噻唑的防腐机理及其与铈离子处理AA 2024-T3的潜在协同作用

摘要 研究了 2-巯基苯并噻唑 (2-MBT) 的腐蚀保护机制及其与氯化铈 (CeCl3) 对航空航天合金 AA 2024-T3 可持续性的潜在协同作用。腐蚀抑制剂 2-MBT 和 CeCl3 及其潜在的协同性能通过图像辅助电化学噪声、分裂电池技术、动电位极化、电化学阻抗谱 (EIS) 和扫描电子显微镜 (SEM) 观察进行评估。这表明 2-MBT 抑制了 S 相颗粒的脱合金，并防止了 AA 2024-T3 表面上富铜颗粒的形成。2-MBT 通过在 AA 2024-T3 表面形成保护层来保护第二相颗粒免受腐蚀，并在 3.5% NaCl 溶液中提供可持续性。此外，在铝的阳极溶解过程中，2-MBT 吸附在 AA 2024-T3 的表面。没有发现 2-MBT 和 Ce3+ 基腐蚀抑制剂之间的协同作用。建议 2-MBT 保护金属间化合物颗粒免受早期浸泡时间的腐蚀，并阻止氢氧化铈在第二相颗粒上的沉淀。在测试的时间尺度上，2-MBT 显示出比 CeCl3 和 2-MBT + CeCl3 更好的腐蚀保护性能。