Zobeidi Ammar, Neghmouche Nacer Salah, Atia Salem, Kribaa Latifa, Kerassa Aicha, Kamarchou Abasse, AlNoaimi Mousa, Ghernaout Djamel, Ali Mohamed A, Lagum Abdelmajeed Adam, Elboughdiri Noureddine
Department of Chemistry, Faculty of Exact Sciences, University of El Oued, P.O. Box 789, El Oued 39000, Algeria.
Pollution & Waste Treatment Laboratory (PWTL), University of Ouargla, P.O. Box 511, Ouargla 30000, Algeria.
ACS Omega. 2023 Jun 5;8(24):21571-21584. doi: 10.1021/acsomega.3c00741. eCollection 2023 Jun 20.
The inhibitory activity of three prepared azo compounds derived from Schiff bases, namely, bis[5-(phenylazo)-2-hydroxybenzaldehyde]-4,4'-diaminophenylmethane (C1), bis[5-(4-methylphenylazo)-2-hydroxybenzaldehyde]-4,4'-diaminophenylmethane (C2), and bis[5-(4-bromophenylazo)-2-hydroxybenzaldehyde]-4,4'-diaminophenylmethane (C3), against corrosion of steel type XC70 in (HCl, 1 M DMSO) medium was investigated experimentally by electrochemical measurements and theoretically using density functional theory (DFT). The correlation between corrosion inhibition and concentration is direct. The maximum inhibition efficiency at 6 × 10 M for the three azo compounds derived from Schiff bases was 64.37, 87.27, and 55.47% for C1, C2, and C3, respectively. The Tafel curves indicate that the inhibitors follow a mixed but predominantly anodic inhibitor system and have a Langmuir isothermal adsorption process. The observed inhibitory behavior of compounds was supported by DFT calculation. It was also found that there was a strong correspondence between the theoretical and experimental results.
通过电化学测量实验研究了三种由席夫碱衍生的偶氮化合物，即双[5-(苯基偶氮)-2-羟基苯甲醛]-4,4'-二氨基苯甲烷（C1）、双[5-(4-甲基苯基偶氮)-2-羟基苯甲醛]-4,4'-二氨基苯甲烷（C2）和双[5-(4-溴苯基偶氮)-2-羟基苯甲醛]-4,4'-二氨基苯甲烷（C3）在（1 M二甲基亚砜的盐酸）介质中对XC70型钢的缓蚀活性，并使用密度泛函理论（DFT）进行了理论研究。缓蚀作用与浓度之间呈直接相关。对于三种由席夫碱衍生的偶氮化合物，在6×10⁻³ M时，C1、C2和C3的最大缓蚀效率分别为64.37%、87.27%和55.47%。塔菲尔曲线表明，这些缓蚀剂遵循混合但主要为阳极抑制体系，并且具有朗缪尔等温吸附过程。化合物的观察到的缓蚀行为得到了DFT计算的支持。还发现理论结果与实验结果之间有很强的对应关系。
