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The 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. [ABSTRACT FROM AUTHOR]

The shell of viviparid snail extract (SVSE) was prepared by a simple and environmentally friendly hydrolysis method and the corrosion inhibition of carbon steel (CS) by SVSE in 1 M HCl was investigated. HPLC and FTIR analysis showed that the main component of SVSE was a mixture of various amino acids. The results of electrochemical and surface analysis showed that SVSE is a hybrid corrosion inhibitor with a corrosion inhibition efficiency of 95.23%. In addition, the adsorption behavior of SVSE on CS surfaces was also investigated in depth by adsorption isotherms, quantum chemistry (QC) and molecular dynamics simulations (MDS). [ABSTRACT FROM AUTHOR]

[Display omitted] • Pomacea canaliculata extract (PCE) acted as mixed–type corrosion inhibitor. • PCE exhibited excellent anti-corrosion performance in HCl and H 2 SO 4. • The rational use of the use of protein waste was studied. Pomacea canaliculata meat extract (PCE) was explored as a multifunctional green corrosion inhibitor on carbon steel (CS) in 1 M HCl and 0.5 M H 2 SO 4. The results showed that PCE has a high corrosion inhibition effect in both acids. Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible universal (UV–Vis) and high–performance liquid chromatography (HPLC) were used to analyze the chemical composition and functional groups of PCE, which were mainly composed of leucine, glutamic acid, and arginine. The corrosion protection performance of PCE as a multifunctional corrosion inhibitor was studied by electrochemical methods, and the results showed that the corrosion inhibition efficiency of PCE on CS in 1 M HCl and 0.5 M H 2 SO 4 were 97.94 % and 94.38 %, respectively. Scanning electron microscopy (SEM) and atomic force microscope (AFM) were used to observe the corrosion morphology of the metal. X–ray photoelectron spectroscopy (XPS) was used to determine the composition of CS surfaces. Quantum chemistry calculations (QC) and molecular dynamics simulations (MS) were used to predict the adsorption/inhibition properties of some major compounds and chemical transformations formed by the extract. This work helps to explain and understand the mechanism of green corrosion inhibitors in both acids. The study shows that using inexpensive and easily available natural substances as green corrosion inhibitors provides a new approach for achieving both resource utilization and environmental protection. [ABSTRACT FROM AUTHOR]