Carragenina-kappa natural como inhibidor de corrosión ecológico para la corrosión del acero de baja aleación en ácido clorhídrico 1M
No Thumbnail Available
Date
2023
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad Nacional de Trujillo
Abstract
La carragenina extraída desde el alga Chondracanthus chamissoi mediante medio acuoso a 80 °C, se investigó su efecto inhibidor de la corrosión para el acero 2.25Cr-1.0Mo en una solución de HCl 1M, utilizando los métodos gravimétricos (PP), polarización potenciodinámica (PDP), resistencia a la polarización lineal (LPR), modulación de frecuencia electroquímica (EFM) y espectroscopia de impedancia electroquímica (EIS). La carragenina fue caracterizada mediante espectroscopia infrarroja con transformada de Fourier (FTIR) y microscopia electrónica de barrido con espectroscopia dispersiva en energía (SEM-EDS). La carragenina obtenida está compuesta principalmente por κ–carragenina (CKN). La CKN es un inhibidor de corrosión efectivo para el acero 2.25Cr-1.0Mo. Su eficacia de inhibición aumenta con la temperatura y la concentración de CKN. Las eficiencias de inhibición medido con la técnica EIS fueron de 63.5% a 25 °C, 66.4% a 45 °C y 82.6% a 65 °C con una concentración de 1.5 g L-1 de CKN. La adsorción de la CKN se ajustó a la isoterma de Langmuir. La energía libre estándar de adsorción disminuye con la temperatura. La entalpia estándar de adsorción fue positiva y la energía de activación disminuye con la concentración de la CKN. Esto indicaría que la adsorción de la CKN sobre la superficie del acero 2.25Cr-1.0Mo ocurre mediante quimisorción.
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.
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.
Description
Keywords
Algas marinas, Polisacáridos, Corrosión ecológica, Ácido clorhídrico