Bibliographic citations
Alvarado, L., (2023). Carragenina-kappa natural como inhibidor de corrosión ecológico para la corrosión del acero de baja aleación en ácido clorhídrico 1M [Universidad Nacional de Trujillo]. https://hdl.handle.net/20.500.14414/20009
Alvarado, L., Carragenina-kappa natural como inhibidor de corrosión ecológico para la corrosión del acero de baja aleación en ácido clorhídrico 1M []. PE: Universidad Nacional de Trujillo; 2023. https://hdl.handle.net/20.500.14414/20009
@phdthesis{renati/1043538,
title = "Carragenina-kappa natural como inhibidor de corrosión ecológico para la corrosión del acero de baja aleación en ácido clorhídrico 1M",
author = "Alvarado Loyola, Luis Andrés",
publisher = "Universidad Nacional de Trujillo",
year = "2023"
}
The carrageenan extracted from the alga Chondracanthus chamissoi by means of an aqueous medium at 80 °C, its corrosion inhibitory effect was investigated for 2.25Cr-1.0Mo steel in a 1M HCl solution using the gravimetric method, potentiodynamic polarization (PDP), linear polarization resistance (LPR), electrochemical frequency modulation (EFM), and electrochemical impedance spectroscopy (EIS). Carrageenan was characterized by Fourier transform infrared spectroscopy (FTIR) and energy dispersive spectroscopy scanning electron microscopy (SEM-EDS). The obtained carrageenan is mainly composed of κ-carrageenan (CKN). CKN is an effective corrosion inhibitor for 2.25Cr-1.0Mo steel. Its inhibitory efficacy increases with temperature and CKN concentration. The inhibition efficiencies measured with the EIS technique were 63.5% at 25 °C, 66.4% at 45 °C, and 82.6% at 65 °C with a concentration of 1.5 g L-1 of CKN. The CKN adsorption was adjusted to the Langmuir isotherm. The standard free energy of adsorption decreases with temperature. The standard enthalpy of adsorption was positive, and the activation energy decreased with the CKN concentration. This would indicate that the CKN adsorption on the surface of the 2.25Cr-1.0Mo steel occurs through chemisorption.
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