Corrosion resistance of aluminum alloy AA2024 with hard anodizing in sulfuric acid-free solution

Cabral Miramontes, José Ángel y Gaona Tiburcio, Citlalli y García Mata, Estefanía y Esneider Alcála, Miguel Ángel y Maldonado Bandala, Erick y Lara Banda, María del Refugio y Nieves Mendoza, Demetrio y Olguín Coca, Javier y Zambrano Robledo, Patricia del Carmen y López León, Luis Daimir y Almeraya Calderón, Facundo (2022) Corrosion resistance of aluminum alloy AA2024 with hard anodizing in sulfuric acid-free solution. Materials, 15 (18). pp. 1-21. ISSN 1996-1944

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URL o página oficial: https://doi.org/10.3390/ma15186401

Resumen

In the aeronautical industry, Al-Cu alloys are used as a structural material in the manufacturing of commercial aircraft due to their high mechanical properties and low density. One of the main issues with these Al-Cu alloy systems is their low corrosion resistance in aggressive substances; as a result, Al-Cu alloys are electrochemically treated by anodizing processes to increase their corrosion resistance. Hard anodizing realized on AA2024 was performed in citric and sulfuric acid solutions for 60 min with constant stirring using current densities 3 and 4.5 A/dm2. After anodizing, a 60 min sealing procedure in water at 95 °C was performed. Scanning electron microscopy (SEM) and Vickers microhardness (HV) measurements were used to characterize the microstructure and mechanical properties of the hard anodizing material. Electrochemical corrosion was carried out using cyclic potentiodynamic polarization curves (CPP) and electrochemical impedance spectroscopy (EIS) in a 3.5 wt. % NaCl solution. The results indicate that the corrosion resistance of Al-Cu alloys in citric acid solutions with a current density 4.5 A/dm2 was the best, with corrosion current densities of 2 × 10−8 and 2 × 10−9 A/cm2. Citric acid-anodized samples had a higher corrosion resistance than un-anodized materials, making citric acid a viable alternative for fabricating hard-anodized Al-Cu alloys.

Tipo de elemento:

Article

Palabras claves no controlados:

Aluminum alloy, Hard coatings, Corrosion, Environmentally friendly

Materias:

CONACYT > Ingeniería y Tecnología
T Tecnología > TA Ingeniería General y Civil

Divisiones:

Ingeniería Mecánica y Eléctrica

Usuario depositante:

Dra Citlalli Gaona

Creadores:

Creador	Email	ORCID
Cabral Miramontes, José Ángel	NO ESPECIFICADO	NO ESPECIFICADO
Gaona Tiburcio, Citlalli	NO ESPECIFICADO	orcid.org/0000-0001-9072-3090
García Mata, Estefanía	NO ESPECIFICADO	NO ESPECIFICADO
Esneider Alcála, Miguel Ángel	NO ESPECIFICADO	orcid.org/0000-0003-1483-3081
Maldonado Bandala, Erick	NO ESPECIFICADO	NO ESPECIFICADO
Lara Banda, María del Refugio	NO ESPECIFICADO	NO ESPECIFICADO
Nieves Mendoza, Demetrio	NO ESPECIFICADO	NO ESPECIFICADO
Olguín Coca, Javier	NO ESPECIFICADO	NO ESPECIFICADO
Zambrano Robledo, Patricia del Carmen	patricia.zambranor@uanl.edu.mx	NO ESPECIFICADO
López León, Luis Daimir	NO ESPECIFICADO	NO ESPECIFICADO
Almeraya Calderón, Facundo	NO ESPECIFICADO	orcid.org/0000-0002-3014-2814