Anodizing of AA2024 Aluminum–Copper Alloy in Citric-Sulfuric Acid Solution: Effect of Current Density on Corrosion Resistance

Cabral Miramontes, José Ángel y Cabral Miramontes, Noe y Nieves Mendoza, Demetrio y Lara Banda, María del Refugio y Maldonado Bandala, Erick y Olguín Coca, Javier y López León, Luis Daimir y Estupiñan López, Francisco H. y Almeraya Calderón, Facundo y Gaona Tiburcio, Citlalli (2024) Anodizing of AA2024 Aluminum–Copper Alloy in Citric-Sulfuric Acid Solution: Effect of Current Density on Corrosion Resistance. Coatings, 14 (7). pp. 1-23. ISSN 2079-6412

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URL o página oficial: https://doi.org/10.3390/coatings14070816

Resumen

Al–Cu alloys are widely used as a structural material in the manufacture of commercial aircraft due to their high mechanical properties such as hardness, strength, low density, and tolerance to fatigue damage and corrosion. One of the main problems of these Al–Cu alloy systems is their low corrosion resistance. The purpose of this study is to analyze the influence of anodizing parameters on aluminum–copper alloy (AA 2024) using a bath of citric-sulfuric acid with different anodizing current densities on the thickness, microhardness, and corrosion resistance of the anodized layer. Hard anodizing is performed on AA 2024 Al–Cu alloy in mixtures of solutions composed of citric and sulfuric acid at different concentrations for 60 min and using current densities (i) of 0.03, 0.045, and 0.06 A/cm2. Scanning electron microscopy (SEM) was used to analyze the surface morphology and thickness of the anodized layer. The mechanical properties of the hard anodized material are evaluated using the Vickers hardness test. The electrochemical techniques use cyclic potentiodynamic polarization curves (CPPC) according to ASTM-G6 and electrochemical impedance spectroscopy (EIS) according to ASTM-G61 and ASTM-G106, respectively, in the electrolyte of NaCl at 3.5 wt. % as a simulation of the marine atmosphere. The results indicate that corrosion resistance anodizing in citric-sulfuric acid solutions with a current density of 0.06 A/cm2 is the best with a corrosion current density (jcorr) of 1.29 × 10−8 A/cm2. It is possible to produce hard anodizing with citric and sulfuric acid solutions that exhibit mechanical properties and corrosion resistance similar or superior to conventional sulfuric acid anodizing. Keywords: aerospace alloy; corrosion; anodizing; electrochemistry

Tipo de elemento:

Article

Palabras claves no controlados:

Aleación aeroespacial; Corrosión; Anodizado; Electroquímica

Materias:

T Tecnología > TA Ingeniería General y Civil

Divisiones:

Ingeniería Mecánica y Eléctrica > Maestría en Ingeniería Aeronáutica con orientación en: Materiales, Estructuras, o Dinámica de Vuelo

Usuario depositante:

Dra Citlalli Gaona

Creadores:

Creador	Email	ORCID
Cabral Miramontes, José Ángel	NO ESPECIFICADO	orcid.org/0000-0003-1483-3081
Cabral Miramontes, Noe	NO ESPECIFICADO	NO ESPECIFICADO
Nieves Mendoza, Demetrio	NO ESPECIFICADO	NO ESPECIFICADO
Lara Banda, María del Refugio	NO ESPECIFICADO	NO ESPECIFICADO
Maldonado Bandala, Erick	NO ESPECIFICADO	NO ESPECIFICADO
Olguín Coca, Javier	NO ESPECIFICADO	NO ESPECIFICADO
López León, Luis Daimir	NO ESPECIFICADO	NO ESPECIFICADO
Estupiñan López, Francisco H.	NO ESPECIFICADO	NO ESPECIFICADO
Almeraya Calderón, Facundo	facundo.almerayacl@uanl.edu.mx	orcid.org/0000-0002-3014-2814
Gaona Tiburcio, Citlalli	citlalli.gaonatbr@uanl.edu.mx	orcid.org/0000-0001-9072-3090