Fish processing discards extract as an eco-friendly corrosion inhibitor for carbon steel in hydrochloric acid

Abstract

AbstractThe objective of this study is to extract amino acids from fish processing discards for the preparation of highly effective and degradable corrosion inhibitors. The composition of fish processing discards extract (FPDE) was characterized by HPLC and FTIR. The results showed that the main components of FPDE are amino acids and contain a large number of unsaturated functional groups. Electrochemical techniques (electrochemical impedance spectroscopy (EIS) and Tafel), surface analysis (XPS and AFM), and molecular dynamics simulations (MDS) were conducted to investigate the corrosion inhibition mechanism of FPDE for carbon steel in 1 mol/L HCl. As shown by electrochemical tests, FPDE exhibits mixed-type corrosion inhibition with a maximum inhibition efficiency of 93.3%. FPDE exhibits excellent corrosion inhibition properties on carbon steel surfaces by forming a high coverage film through chemisorption and physisorption. Indeed, the advantages of remarkable inhibition efficiency and facile extraction methods allow FPDE to become a promising corrosion inhibitor for practical applications.Keywords: Corrosion inhibitorprocessing discardsextractionEISTafel AcknowledgementsWe thank all the authors for their joint efforts and the authors' organizations for their support.Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.Additional informationFundingThis work was supported by the Science and Technology Innovation Program of 'The Construction of the Chengdu-Chongqing Economic Circle' (No. KJCX2020050), the Research Foundation of Chongqing University of Science and Technology (No. ckrc2020025), the Natural Science Foundation of Chongqing, China (cstc2021jcyj-msxmX0901), the Natural Science Foundation of China (Nos. 51778097 and 52178458), the Science and Technology Research Program of Chongqing Municipal Education Commission (No. KJQN202201518), and the Innovation Program for Graduate Students of Chongqing University of Science and Technology (No. YKJCX2220604).