Corrosion inhibition with a perezone-impregnated Mg/Al hydrotalcite coating in AS21 alloy


Por: Casillas, Gabriel Espinosa, Vazquez, Araceli Espinoza, Gómez F.J.R., Vasquez, Araceli Perez, Mata, Rachel, Miralrio, Alan, Castro, Miguel, Martinez, Ricardo Galvan, Cruz, Ricardo Orozco

Publicada: 10 jul 2023 Ahead of Print: 1 may 2023
Resumen:
The effect of perezone concentration and the behavior of the hydrotalcite MgAl coating impregnated with the perezone on the AS21 magnesium alloy were studied using electrochemical impedance spectroscopy (EIS). The results show that the perezone molecule protects the magnesium surface, with the best concentration being 10 ppm. When the inhibitor was impregnated with the hydrotalcite, the corrosion protection was significantly improved, reaching 91.1% inhibition efficiency. In order to elucidate the adsorption mechanism of perezone on magnesium surfaces, density functional theory calculations (DFT) within a cluster approach were carried out. The Pearson's Hard-Soft Acid-Base theoretical framework reveals, by means of several global parameters, a strong interaction between perezone and the metal surface. Two different adsorption modes were studied in deep. The mixed physisorption-chemisorption process was rationalized in terms of the interactions between the organic molecule and the Mg10 magnesium cluster. Perezone molecule is adsorbed by the oxygen atoms of the substituted quinone ring, whereas the physical component can be explained by the electrostatic interactions between them. The metal cluster transferred charge to the corrosion inhibitor molecule is of about 0.507 e. The formation of a protective layer was observed by means of SEM-EDS and explained by the Fukui reactivity indices.

Filiaciones:
Casillas, Gabriel Espinosa:
 Departamento de Ingeniería Metalúrgica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico

Vazquez, Araceli Espinoza:
 Unidad Anticorrosión, Instituto de Ingeniería, Universidad Veracruzana, Veracruz, Boca del Río, 94294, Mexico

Gómez F.J.R.:
 Departamento de Ingeniería Metalúrgica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico

Vasquez, Araceli Perez:
 Departamento de Farmacia, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico

Mata, Rachel:
 Departamento de Farmacia, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico

Miralrio, Alan:
 Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Av. Eugenio Garza Sada 2501, NL, Monterrey, 64849, Mexico

Castro, Miguel:
 Departamento de Física y Química Teórica, DEPg. Facultad de Química, UNAM, Del. Coyoacán, Ciudad de México, 04510, Mexico

Martinez, Ricardo Galvan:
 Unidad Anticorrosión, Instituto de Ingeniería, Universidad Veracruzana, Veracruz, Boca del Río, 94294, Mexico

Cruz, Ricardo Orozco:
 Unidad Anticorrosión, Instituto de Ingeniería, Universidad Veracruzana, Veracruz, Boca del Río, 94294, Mexico
ISSN: 00134686





ELECTROCHIMICA ACTA
Editorial
Elsevier Science Ltd, Exeter, United Kingdom, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND, Reino Unido
Tipo de documento: Article
Volumen: 456 Número:
Páginas:
WOS Id: 000998997400001