Insights into the Corrosion Inhibition Mechanism of Canavalia gladiata Leaf Extract for Copper in Sulfuric Acid Medium

Hui Huang; Lihao Xie; Xinhuan Chen; Wenlong Li; Riadh Marzouki

doi:10.1021/acs.langmuir.3c03124

Insights into the Corrosion Inhibition Mechanism of Canavalia gladiata Leaf Extract for Copper in Sulfuric Acid Medium

Langmuir. 2024 Feb 6. doi: 10.1021/acs.langmuir.3c03124. Online ahead of print.

Authors

Hui Huang^{1

2}, Lihao Xie¹, Xinhuan Chen¹, Wenlong Li¹, Riadh Marzouki³

Affiliations

¹ Ningbo University of Technology, Ningbo, Zhejiang 315211, China.
² Zhejiang Institute of Tianjin University, Ningbo, Zhejiang 315201, China.
³ Department of Chemistry, College of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia.

PMID: 38320302
DOI: 10.1021/acs.langmuir.3c03124

Abstract

Canavalia gladiata leaf extract (CGLE) is extracted from crop waste employing a water decoction method. By employing electrochemical techniques, morphology analysis, quantum chemical calculations, and other methods, we extensively investigated the anticorrosion efficacy of CGLE on copper within a H₂SO₄ solution. The outcomes reveal that at 298 K, a CGLE concentration of 800 mg/L attains a remarkable inhibition efficiency (IE) of 96.8%. Additionally, we examined the impact of CGLE on the corrosion resistance of copper at varying temperatures. Even with rising temperatures, CGLE manages to sustain an IE of over 95%. This indicates that CGLE is mainly chemisorption based on the copper, leading to a strong adsorption. The surface test results show a noteworthy decrease in the extent of copper surface corrosion upon the introduction of CGLE. The study of the adsorption model demonstrates the alignment of CGLE adsorption onto the copper with the Langmuir adsorption.