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Electrochemical and adsorption behaviors of thiadiazole derivatives on the aluminum surface

机译：噻二唑衍生物在铝表面的电化学和吸附行为

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The electrochemical and adsorption behaviors of BODTA were studied in a 3.0 wt% NaCl solution via different electrochemical methods. Different concentrations of 2,5-bis(octyldithio)-1,3,4-thiadiazole (BODTA) were dissolved in rolling oil, and then aluminum electrodes coated with rolling oil were applied as the working electrode. The morphology and the elements of the electrode surface were studied via SEM, EDS and XPS. Results showed that BODTA had a slight inhibition efficiency of 10.75% when its concentration was 0.1 wt%; however, with the changes in the BODTA concentration from 0.3 wt%, 0.5 wt% to 0.7 wt%, BODTA had an antagonistic effect on the aluminum surface and accelerated the corrosion. The corresponding inhibition efficiencies became negative, which were ?21.53%, ?30.34%, and ?18.82%. The analysis of elements and chemical states on the surface indicated that Al–N and Al–S bonds were formed between aluminum and BODTA. Furthermore, quantum chemical calculations were also performed, which manifested that N and S atoms were the main reactive sites. S atoms on side chains had a stronger reactivity than those in the thiadiazole ring. Finally, the present study was helpful to understand the electrochemical and adsorption behaviors of BODTA on aluminum, and made contributions to the application of BODTA in rolling oil.
机译：通过不同的电化学方法研究了BODTA在3.0 wt％NaCl溶液中的电化学和吸附行为。将不同浓度的2,5-双（辛基二硫代）-1,3,4-噻二唑（BODTA）溶解在轧制油中，然后将涂有轧制油的铝电极用作工作电极。通过SEM，EDS和XPS研究了电极表面的形貌和元素。结果表明，当浓度为0.1 wt％时，BODTA的抑制效率为10.75％。然而，随着BODTA浓度从0.3 wt％，0.5 wt％变为0.7 wt％，BODTA对铝表面具有拮抗作用并加速了腐蚀。相应的抑制效率变为负的，分别为21.53％，30.34％和18.82％。对表面元素和化学状态的分析表明，铝和BODTA之间形成了Al–N和Al–S键。此外，还进行了量子化学计算，结果表明N和S原子是主要的反应位点。侧链上的S原子比噻二唑环中的S原子具有更强的反应性。最后，本研究有助于了解BODTA在铝上的电化学和吸附行为，为BODTA在轧制油中的应用做出了贡献。

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