Izvorni znanstveni članak
https://doi.org/https://doi.org/10.5599/jese.2331
Bidens pilosa extract as a corrosion inhibitor on 1008 carbon steel in neutral medium
José Dávila
; Corrosion Laboratory, Chemical Engineering and Textile Faculty, National University of Engineering, Av. Tupac Amaru, No. 210, Rimac, Lima, Perú
Karin Paucar
; Corrosion Laboratory, Chemical Engineering and Textile Faculty, National University of Engineering, Av. Tupac Amaru, No. 210, Rimac, Lima, Perú
Abel Vergara
; Corrosion Laboratory, Chemical Engineering and Textile Faculty, National University of Engineering, Av. Tupac Amaru, No. 210, Rimac, Lima, Perú
Idalina Aoki
; Chemical Engineering Department, Polytechnic School, University of São Paulo, Av. Prof. Luciano Gualberto, travessa 3, n0. 380, CEP 05508-010 São Paulo, Brazil
Keidy Cancino
; Environmental Engineering Department, San Ignacio de Loyola University, Av. La Fontana, No. 550, La Molina, Lima, Perú
Jesus Falcón
; Environmental Engineering Department, San Ignacio de Loyola University, Av. La Fontana, No. 550, La Molina, Lima, Perú
Sažetak
The aim of this work is to evaluate the performance of Bidens pilosa extract as a corrosion inhibitor for 1008 carbon steel in a neutral medium of 0.1 M NaCl. The research has been accomplished by weight loss measurements, linear polarization resistance (Rp) monitoring and electrochemical impedance spectroscopy (EIS). Phytochemical analysis and Fourier transform infrared spectroscopy were performed to determine bioactive components and detect the main functional groups of Bidens pilosa extract, respectively. The morphological characterization of the substrate was carried out by optical microscopy (OM). Different isotherms were evaluated to understand more clearly the adsorption mechanism of the inhibitor extract molecules on the surface of the 1008 carbon steel substrate, and the best fit was obtained for the Langmuir isotherm. The results showed that the corrosion rate decreased with an increase of the concentration of the inhibitor up to 1000 ppm, reaching a maximum efficiency value of 82.9 % from gravimetric tests, and 73.1 % from the fitting of EIS data to an equivalent electric circuit. The calculated thermodynamic parameters suggested the formation of a monolayer of inhibitor molecules on the metal surface. The ΔGoads value (-22.8 kJ mol-1) determined from the Langmuir isotherm model indicated that adsorption of the inhibitor molecules on the substrate surface follows a physisorption mechanism. This research revealed that Bidens pilosa extract can be used as a corrosion inhibitor and emerges as an alternative to replace synthetic corrosion inhibitors that are harmful to health and cause damage to the environment.
Ključne riječi
Green corrosion inhibitor; corrosion resistance; phytochemical screening; electrochemical impedance spectroscopy; adsorption isotherms
Hrčak ID:
319748
URI
Datum izdavanja:
23.7.2024.
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