Citric acid as an alternative to sulfuric acid for the hard-anodizing of AA6061

Cabral Miramontes, José Ángel y Almeraya Calderón, Facundo y Estupiñan López, Francisco H. y Lara Banda, María del Refugio y Olguín Coca, Javier y López León, Luis Daimir y Castañeda Robles, Ivan y Esneider Alcála, Miguel Ángel y Zambrano Robledo, Patricia del Carmen y Gaona Tiburcio, Citlalli (2021) Citric acid as an alternative to sulfuric acid for the hard-anodizing of AA6061. Metals, 11 (11). pp. 1-18. ISSN 2075-4701

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URL o página oficial: https://doi.org/10.3390/met11111838

Resumen

Hard-anodized is a widely used method in the aeronautical sector to improve aluminum alloys abrasion and corrosion resistance. Aim of this work was to characterize the mechanical properties and resistance hard-anodized aluminum 6061 in citric acid solution as a replacement sulfuric acid solution were investigated. Aluminum alloy 6061 was used as the base material to produce the hard anodizing; this process was carried out in a citric and sulfuric acid solution, applying current densities 3 and 4.5 A/cm2 and subsequently exposed to 3.5 wt. % NaCl solution. Microstructure and mechanical properties of the anodizing material were characterized by scanning electron microscopy (SEM) and Vickers microhardness (HV). Corrosion behavior of the hard-anodized material it was carried out with electrochemical techniques as cyclic potentiodynamic polarization (CPP) and electrochemical impedance spectroscopy (EIS) respectively. Results obtained indicated that all samples anodized in citric acid solution showed negative hysteresis and lower corrosion current density (1 × 10−10 A/cm2), indicating generalized corrosion on the material surface. EIS results show that anodizing in citric acid solution and a current density of 4.5 A/dm2 provides better corrosion protection than a sulfuric acid solution.

Tipo de elemento:

Article

Palabras claves no controlados:

Aluminum alloy, Corrosion, EIS, Environmentally friendly, Citric acid

Materias:

CONACYT > Ingeniería y Tecnología
T Tecnología > TP Tecnología Química

Divisiones:

Ingeniería Mecánica y Eléctrica

Usuario depositante:

Dra Citlalli Gaona

Creadores:

Creador	Email	ORCID
Cabral Miramontes, José Ángel	NO ESPECIFICADO	orcid.org/0000-0003-1483-3081
Almeraya Calderón, Facundo	facundo.almerayacl@uanl.edu.mx	orcid.org/0000-0002-3014-2814
Estupiñan López, Francisco H.	NO ESPECIFICADO	NO ESPECIFICADO
Lara Banda, María del Refugio	NO ESPECIFICADO	NO ESPECIFICADO
Olguín Coca, Javier	NO ESPECIFICADO	NO ESPECIFICADO
López León, Luis Daimir	NO ESPECIFICADO	NO ESPECIFICADO
Castañeda Robles, Ivan	NO ESPECIFICADO	NO ESPECIFICADO
Esneider Alcála, Miguel Ángel	NO ESPECIFICADO	NO ESPECIFICADO
Zambrano Robledo, Patricia del Carmen	patricia.zambranor@uanl.edu.mx	NO ESPECIFICADO
Gaona Tiburcio, Citlalli	citlalli.gaonatbr@uanl.edu.mx	orcid.org/0000-0001-9072-3090