Sabiha Malika, Kerroum Younes, El Hawary Maha, Boudalia Maria, Bellaouchou Abdelkbir, Hammani Othmane, Amin Hatem M A
Laboratory of Materials, Nanotechnology and Environment, Faculty of Sciences, Mohammed V University, Rabat 1014, Morocco.
Ingeniería Electroquímica y Corrosión (IEC), Instituto Universitario de Seguridad Industrial, Radiofísica y Medioambiental (ISIRYM), Universitat Politècnica de València, 46022 Valencia, Spain.
Molecules. 2025 Jan 11;30(2):272. doi: 10.3390/molecules30020272.
In recent years, the anti-corrosive properties of natural extracts as environmentally friendly inhibitors have gained considerable interest. This study evaluates the potential of ( L.) essential oil (), collected from Salé, Morocco, as a corrosion inhibitor for mild steel in 1 M HCl medium. The protection performance of was assessed using various electrochemical techniques, including potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS), as well as the weight loss method. The influence of concentration and temperature on the inhibition performance were investigated. demonstrated pronounced inhibitory benefits via increasing the corrosion resistance of mild steel in the corrosive HCl solution, thus reducing the corrosion rate to 0.11 mg cm h and increasing the inhibition efficiency to 87.1% at an inhibitor concentration of 500 ppm. PDP confirmed that the inhibitor works as a mixed-type inhibitor with cathodic supremacy. EIS revealed that the charge transfer mechanism is the main controlling factor for the corrosion process. The thermodynamic parameters suggested a key role of physisorption in inhibition, following the Langmuir isotherm. Importantly, SEM and EDX analyses suggested the formation of a protective layer of the extract onto the steel surface, which shields the surface from corrosive species. This is owed to the functional group-rich phytochemicals of . Therefore, the development of bio-based corrosion inhibitors is not only a step towards more eco-friendly industrial practices, but also meets the growing demand for sustainable materials in a world with constrained resources.
近年来，天然提取物作为环境友好型缓蚀剂的防腐性能引起了广泛关注。本研究评估了从摩洛哥萨莱采集的唇萼薄荷（Mentha pulegium L.）精油（MPEO）在1 M HCl介质中作为低碳钢缓蚀剂的潜力。采用多种电化学技术，包括动电位极化（PDP）和电化学阻抗谱（EIS）以及失重法，评估了MPEO的防护性能。研究了MPEO浓度和温度对缓蚀性能的影响。MPEO通过提高低碳钢在腐蚀性HCl溶液中的耐腐蚀性显示出显著的缓蚀效果，在缓蚀剂浓度为500 ppm时，腐蚀速率降至0.11 mg cm⁻² h⁻¹，缓蚀效率提高到87.1%。PDP证实该缓蚀剂作为一种以阴极为主的混合型缓蚀剂起作用。EIS表明电荷转移机制是腐蚀过程的主要控制因素。热力学参数表明，按照朗缪尔等温线，物理吸附在缓蚀中起关键作用。重要的是，扫描电子显微镜（SEM）和能谱分析（EDX）表明提取物在钢表面形成了一层保护层，使表面免受腐蚀性物质的侵蚀。这归因于MPEO中富含官能团的植物化学物质。因此，开发基于生物的缓蚀剂不仅是迈向更环保工业实践的一步，也满足了在资源有限的世界中对可持续材料不断增长的需求。
