Fouda Abd El-Aziz S, Al-Bonayan Ameena M, Molouk Ahmed F, Eissa M
Chemistry Department, Faculty of Science, Mansoura University Mansoura-35516 Egypt
Chemistry Department, Faculty of Science, Umm Al-Qura University Makkah Kingdom of Saudi Arabia.
RSC Adv. 2022 Oct 28;12(48):30906-30920. doi: 10.1039/d2ra05795f. eCollection 2022 Oct 27.
Aizoon extract is used as an eco-friendly anti-corrosive material for stainless steel 430 (SS430) in a 2 M hydrochloric acid solution. Many strategies were utilized to estimate the mitigation efficacy such as mass reduction (MR), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). The inhibition percentage (%) increases by increasing the concentration of Aizoon and reaches 95.8% at 300 ppm and 298 K, while it lowers by raising the temperature, reaching 85.6% at 318 K. Tafel curves demonstrated that Aizoon extract is a mixed type inhibitor with an excellent ability to inhibit the cathodic reaction. Adsorption of the Aizoon extract on an SS430 surface is regulated by the Langmuir adsorption model. The value is is -20.9 kJ mol at 298 K indicating that the adsorption is of mixed type affecting both cathodic and anodic reactions. Thermodynamic factors for adsorption and activation processes were estimated and discussed. The adsorption of Aizoon extract on the SS430 surface was tested utilizing Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) techniques. The Nyquist curves confirmed that Aizoon extract prohibits the disintegration of SS430 in an acid medium without changing the dissolution reaction mechanism. The theoretical calculations showed that Aizoon extract is considered as an excellent corrosion inhibitor. The experimental data were supported by theoretical evaluations.
松叶菊提取物在2M盐酸溶液中被用作不锈钢430（SS430）的一种环保型防腐材料。采用了多种策略来评估缓蚀效果，如质量减少（MR）、电化学阻抗谱（EIS）和动电位极化（PDP）。随着松叶菊浓度的增加，缓蚀率（%）升高，在300ppm和298K时达到95.8%，而随着温度升高缓蚀率降低，在318K时达到85.6%。塔菲尔曲线表明松叶菊提取物是一种混合型缓蚀剂，具有优异的抑制阴极反应的能力。松叶菊提取物在SS430表面的吸附受朗缪尔吸附模型控制。298K时的值为-20.9kJ/mol，表明吸附为混合型，对阴极和阳极反应均有影响。对吸附和活化过程的热力学因素进行了估算和讨论。利用傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）技术测试了松叶菊提取物在SS430表面的吸附。奈奎斯特曲线证实松叶菊提取物在酸性介质中可防止SS430分解，且不改变溶解反应机理。理论计算表明松叶菊提取物被认为是一种优异的缓蚀剂。实验数据得到了理论评估的支持。
