The inhibition performance of an aqueous extract of Cynara cardunculus leaves on the corrosion of St37 steel immersed in seawater and seawater with bleach was investigated using weight loss measurements, electrochemical methods, and surface characterization techniques. It was found that the extract components acted primarily as a mixed-type inhibitor, and inhibition efficiency increased with increasing inhibitor concentration. Electrochemical impedance spectroscopy (EIS) and dynamic electrochemical impedance spectroscopy (DEIS) confirmed the formation of a protective layer on the metallic surface in both solutions. The adsorption of inhibiting molecules conformed to the Langmuir isotherm model. The thermodynamic parameter values indicated that chemisorption constituted the major contribution to the adsorption process. This result was corroborated by scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) analyses. The significant inhibition effect can be related to the large amount of phenolic compounds in the CC aqueous extract as revealed by the Fourier-transform infrared (FTIR) spectrum.

Cynara cardunculus水提取物的抑制性能使用失重测量，电化学方法和表面表征技术，研究了浸泡在海水和漂白剂中的海水对St37钢腐蚀的影响。发现提取物组分主要起混合型抑制剂的作用，并且抑制效率随抑制剂浓度的增加而增加。电化学阻抗谱（EIS）和动态电化学阻抗谱（DEIS）证实了两种溶液在金属表面均形成了保护层。抑制分子的吸附符合朗缪尔等温线模型。热力学参数值表明化学吸附是吸附过程的主要贡献。扫描电子显微镜（SEM）和能量色散X射线（EDX）分析证实了这一结果。如傅立叶变换红外（FTIR）光谱所揭示的，显着的抑制作用可能与CC水提取物中大量酚类化合物有关。