Fouda A S, Rashwan S, Ibrahim H, Reda M, Eissa M E, El-Hossiany A
Chemistry Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt.
Department of Chemistry, Faculty of Science, Suez Canal University, Ismailia, Egypt.
Sci Rep. 2025 May 17;15(1):17120. doi: 10.1038/s41598-025-98407-z.
Cuminum cyminum extract (CCE) has been studied as a corrosion inhibitor in controlling corrosion of C-steel corrosion in 0.5 M HSO, by weight loss (WL), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), energy-dispersive X-ray spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM) measurements. The findings demonstrated that inhibition efficiency (% IE) enhanced with increasing extract dosages, attaining 83.49% at 200 ppm and finishing at 91.83% at 400 ppm. However, inhibition efficiency was reduced by raising the temperature, decreasing from 91.83% at 298 K to 78.63% at 318 K (all at 400 ppm). CCE adhered to the C-steel surface by the Langmuir adsorption isotherm. EIS measurements exhibited increased transfer resistance (R) as the extract dose increased. Polarization curves showed that CCE functions as a mixed-type inhibitor. Several thermodynamic parameters were computed and examined. The free energy of adsorption for the extract under study was calculated and was found 34.7-35.8 kJ mol. Chemical and electrochemical approaches yielded reliable and agreeable results.
孜然提取物（CCE）已被作为一种缓蚀剂进行研究，通过失重法（WL）、动电位极化法（PDP）、电化学阻抗谱（EIS）、能量色散X射线光谱、扫描电子显微镜（SEM）和原子力显微镜（AFM）测量，来控制0.5M硫酸中碳钢的腐蚀。研究结果表明，缓蚀效率（%IE）随着提取物用量的增加而提高，在200ppm时达到83.49%，在400ppm时达到91.83%。然而，缓蚀效率会随着温度升高而降低，从298K时的91.83%降至318K时的78.63%（均为400ppm）。CCE通过朗缪尔吸附等温线附着在碳钢表面。EIS测量表明，随着提取物用量的增加，转移电阻（R）增大。极化曲线表明CCE起混合型缓蚀剂的作用。计算并考察了几个热力学参数。计算了所研究提取物的吸附自由能，发现其为34.7 - 35.8kJ/mol。化学和电化学方法得出了可靠且一致的结果。
