Exploring of an ecological corrosion inhibitor of wood hibiscus leaf extract for the Cu/H2SO4 system based on experimental study and theoretical calculations

• Published in: Journal of the Taiwan Institute of Chemical Engineers 2023-02, Vol.143, p.104686, Article 104686
• Main Authors: Xu, Zhixiong, Tan, Bochuan, Zhang, Shengtao, Chen, Jida, Li, Wenpo
• Format: Article
• Language: English
• Subjects: Corrosion inhibitor; Extraction; Molecular dynamics simulation; Theoretical calculation
• ISSN: 1876-1070; 1876-1089
• DOI: 10.1016/j.jtice.2023.104686

•MLE is an ecological corrosion inhibitor.•The inhibitory efficiency reaches a value of 93% at 160 mg/L.•The adsorption type accords with Langmuir isothermal adsorption.•The theory is consistent with the experimental results. There is beyond dispute that environmental protection and sustainable development have become the major theme in the world. It is necessary to explore an ecological corrosion inhibitor. The corrosion inhibition performance of wood hibiscus leaves (HLE) was studied by electrochemical measurement. The bonding information and functional group of Cu after immersed in H2SO4 solution (with or without HLE), which were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray electron spectroscopy (XPS). The morphology of Cu was characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The anti-corrosion mechanism of HLE on copper was investigated by theoretical calculations and Monte Carlo simulation. The corrosion inhibition efficiency of 160 mg/L HLE is close to 92% at 298 K, and the adsorption type belonged to Langmuir adsorption. Theoretical calculations and experimental results showed that HLE was adsorbed on copper in parallel, forming a membrane to protect copper from corrosion. [Display omitted]