Insights into the Anticorrosion Performance of Solanum lyratum Leaf Extract for Copper in Sulfuric Acid Medium

Congrui Ouyang; Zhenqiang Wang; Bochuan Tan; Ameni Brahmia

doi:10.1021/acs.langmuir.2c03396

Insights into the Anticorrosion Performance of Solanum lyratum Leaf Extract for Copper in Sulfuric Acid Medium

Langmuir. 2023 May 16;39(19):6666-6680. doi: 10.1021/acs.langmuir.2c03396. Epub 2023 May 1.

Authors

Congrui Ouyang¹, Zhenqiang Wang¹, Bochuan Tan², Ameni Brahmia^{3

4}

Affiliations

¹ College of Chemistry, Chongqing Normal University, Chongqing 401331, P.R. China.
² School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, P.R. China.
³ Chemistry Department, College of Science, King Khalid University, Abha 61413, Saudi Arabia.
⁴ Chemistry Department, Faculty of Sciences, University of Sfax, 1171, Sfax 3000, Tunisia.

PMID: 37126522
DOI: 10.1021/acs.langmuir.2c03396

Abstract

In this paper, Solanum lyratum leaves were prepared into a corrosion inhibitor by a pure water extraction method. As a natural plant, S. lyratum leaf extract as a corrosion inhibitor has green features. S. lyratum leaf extract (SLLE) can effectively inhibit the corrosion of Cu in H₂SO₄ solution. The protective effect on copper in 0.5 mol/L H₂SO₄ solution was studied by electrochemical measurement, Fourier transform infrared spectrometry (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM), and theoretical calculation. These results showed that the maximum corrosion inhibition efficiency (η) of SLLE for copper obtained in the electrochemical measurement at different temperatures is more than 90%. The adsorption of SLLE on copper surfaces conforms to the Langmuir isotherm adsorption model. FTIR and XPS showed the bonding information. SEM and AFM proved that the SLLE can protect the copper from corrosion media. The interaction and inhibition mechanism between the SLLE and copper surface was further revealed at the molecular level by theoretical calculation.