Synergistic Effect of Benincasa hispida Peel Extract and KI on the Corrosion Inhibition of Mild Steel in HCl

Qihui Wang (), Chongkang Zhao, Qi Zhang, Xing Zhou, Zhitao Yan, Yi Sun, Da Sun () and Xueming Li
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Qihui Wang: School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China
Chongkang Zhao: School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China
Qi Zhang: School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China
Xing Zhou: School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China
Zhitao Yan: School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China
Yi Sun: School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China
Da Sun: Institute of Life Science & Biomedical Collaborative Innovation Center of Zhejiang Province, Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, National & Local Joint Engineering Research, Center for Ecological Treatment Technology of Urban Water Pollution, Wenzhou University, Wenzhou 325035, China
Xueming Li: School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China

Sustainability, 2023, vol. 15, issue 14, 1-19

Abstract: This study employed Benincasa hispida peel as a raw material for the preparation of Benincasa hispida peel extract (BHPE) via hot water extraction and freeze-drying processes. The synergistic effect of BHPE and KI on the corrosion inhibition of mild steel in 1 M HCl was investigated. The compositional analysis shows that BHPE consists mainly of a mixture of sugars, characterized by a high density of hydroxyl groups and unsaturated functional groups, characteristic of highly effective corrosion inhibitors. Electrochemical experiments and surface analysis show that the composite of BHPE and KI can effectively provide protection to mild steel. Moreover, the synergistic coefficient of BHPE and KI under various concentration conditions was greater than 1, and the highest corrosion inhibition efficiency was 94.4%. In addition, the corrosion inhibition mechanism of BHPE was thoroughly investigated using quantum chemistry (QC) and molecular dynamics simulation (MDS).

Keywords: corrosion inhibition; synergism; agricultural crops; mild steel (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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