Corrosion resistance property of eco-friendly Amorphophallus paeoniifolius leaves (APL) extract on mild steel surface in 1 M hydrochloric acid solution was studied by chemical, electrochemical and surface characterization methods. The functional groups and compositions of pure APL extract and corrosion product were investigated by FT-IR and UV–visible spectroscopy. Experimental methods proved the extent of metal surface deterioration in acidic medium was diminished as the APL extract concentrations increased. Corrosion inhibition mechanism is suggested to be a mixed type based on results obtained by polarization measurements. The data obtained by electrochemical impedance spectroscopic method indicates the development of protective film around the metal surface. Surface morphological studies such as FESEM, contact angle measurements and AFM studies performed on mild steel surfaces further confirm the protective ability of the inhibitor towards corrosion. It was well supported by EDAX studies indicating restricted anodic dissolution reaction in the presence of inhibitor. Adsorption isotherms showed a good fit to Langmuir isotherm and the data obtained indicates the spontaneous adsorption with the majority being physisorption. Thermodynamic and activation parameters showed the efficacy of inhibitor in controlling the corrosion and the efficiency of corrosion inhibition was found to be inversely proportional to the solution temperature. Percentage corrosion inhibition efficiency (92.49) obtained by electrochemical impedance spectroscopy on mild steel for 10% v/v concentration of APL extract was in good agreement with other experimental methods.

环保型芍药叶片的耐腐蚀性能通过化学、电化学和表面表征方法研究了在 1 M 盐酸溶液中低碳钢表面的 (APL) 提取物。通过FT-IR和紫外-可见光谱研究了纯APL提取物和腐蚀产物的官能团和组成。实验方法证明，随着 APL 提取物浓度的增加，酸性介质中金属表面劣化的程度降低。根据极化测量的结果，腐蚀抑制机制被建议为混合型。通过电化学阻抗光谱法获得的数据表明在金属表面周围形成了保护膜。表面形态研究，如 FESEM，在低碳钢表面上进行的接触角测量和 AFM 研究进一步证实了抑制剂对腐蚀的保护能力。EDAX 研究很好地支持了这一点，表明在抑制剂存在下阳极溶解反应受到限制。吸附等温线显示出与朗缪尔等温线的良好拟合，获得的数据表明自发吸附主要是物理吸附。热力学和活化参数表明抑制剂在控制腐蚀方面的功效，并且发现腐蚀抑制的效率与溶液温度成反比。对于 10% v/v 浓度的 APL 提取物，通过电化学阻抗谱在低碳钢上获得的腐蚀抑制效率百分比 (92.49) 与其他实验方法非常一致。