Fouda Abd El-Aziz S, Rashwan Salah M, Kamel Medhat M, Atef Mohamed, El-Hossiany Ahmed
Department of Chemistry, Faculty of Science, Mansoura University Mansoura-35516 Egypt
Department of Chemistry, Faculty of Science, Suez Canal University Egypt.
RSC Adv. 2024 Nov 21;14(50):37240-37251. doi: 10.1039/d4ra05391e. eCollection 2024 Nov 19.
In this study, we deployed green extract (MOE) as a corrosion inhibitor for copper. The anticorrosion properties of MOE for Cu in 1 M HNO were investigated by various experimental and numerical techniques, including potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and a weight loss (WL) method at different temperatures. Additionally, scanning electron microscopy (SEM) coupled with energy-dispersive X-ray analysis (EDX) and atomic force microscopy (AFM) were utilized to examine the surface morphology of Cu with and without the extract. By contrasting the inhibition effectiveness with and without the extract, the inhibition efficiency (% IE) was observed. The WL method revealed that 300 ppm of the extract had an IE of 93.8% for Cu immersed in one molar HNO solution. The MOE was classified as a mixed type according to the PDP study since it delayed both cathodic and anodic processes, with a cathodic predominance. At 25-45 °C, MOE's free adsorption energies were 23.1-21.5 kJ mol, showing that mixed-type adsorption occurred on the Cu surface. Additionally, the Langmuir adsorption isotherm and the adsorption data from the WL tests of MOE showed a good match. The extract could adsorb spontaneously onto the metal surface, according to the thermodynamic conditions. Analysis of the corrosion product using different techniques revealed that a protective layer had formed on the metal's surface. Hence, MOE had a good corrosive inhibitive effect on Cu in HNO solution. It turned out that all the methods used gave consistent results.
在本研究中，我们采用绿色提取物（MOE）作为铜的缓蚀剂。通过多种实验和数值技术，包括动电位极化（PDP）、电化学阻抗谱（EIS）以及不同温度下的失重（WL）法，研究了MOE对1 M HNO中铜的防腐性能。此外，利用扫描电子显微镜（SEM）结合能量色散X射线分析（EDX）和原子力显微镜（AFM）来检查有无提取物时铜的表面形态。通过对比有无提取物时的缓蚀效果，观察到了缓蚀效率（% IE）。失重法表明，300 ppm的提取物对浸入一摩尔HNO溶液中的铜的缓蚀效率为93.8%。根据PDP研究，MOE被归类为混合型缓蚀剂，因为它同时延缓了阴极和阳极过程，且以阴极为主。在25 - 45 °C时，MOE的自由吸附能为23.1 - 21.5 kJ mol，表明在铜表面发生了混合型吸附。此外，MOE的Langmuir吸附等温线与WL试验的吸附数据显示出良好的匹配。根据热力学条件，提取物能够自发吸附在金属表面。使用不同技术对腐蚀产物进行分析表明，金属表面形成了一层保护层。因此，MOE对HNO溶液中的铜具有良好的缓蚀作用。结果表明，所有使用的方法都给出了一致的结果。
