Electrochemical corrosion behavior of passivated precipitation hardening stainless steels for aerospace applications

Villegas Tovar, José M. y Gaona Tiburcio, Citlalli y Lara Banda, María del Refugio y Maldonado Bandala, Erick y Baltazar Zamora, Miguel Ángel y Cabral Miramontes, José Ángel y Nieves Mendoza, Demetrio y Olguín Coca, Javier y Estupiñan López, Francisco H. y Almeraya Calderón, Facundo (2023) Electrochemical corrosion behavior of passivated precipitation hardening stainless steels for aerospace applications. Metals, 13 (5). pp. 1-18. ISSN 2075-4701

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URL o página oficial: https://doi.org/10.3390/met13050835

Resumen

Precipitation-hardening (PH) stainless steels (SS) are widely used in various aerospace applications. These steels exhibit good mechanical and corrosion resistance. The electrochemical behavior of 15-5PH, 17-4PH, Custom450 and AM 350 stainless steels passivated with citric and nitric acid baths for 60 and 90 min at 25 and 49 °C were evaluated in 5 wt.% sodium chloride (NaCl) and 1 wt.% sulfuric acid (H2SO4) solutions. The electrochemical behavior was studied with potentiodynamic polarization curves (PPC) according to the ASTM G5-13 standard. The results indicated that there are two characteristic mechanisms that are present in the potentiodynamic polarization curves. When the PHSS is immersed in an H2SO4 solution, there is a secondary passivation, and in the NaCl solution, there is a pseudo-passivation (not stable passivation film). The current densities in the NaCl solution were between 10−4 and 10−5 mA/cm2, while those of H2SO4 were recorded around 10−2 and 10−3 mA/cm2. Citric acid does work as a passivating solution, and in some cases, the corrosion resistance of the stainless steel was comparable to that of nitric acid.

Tipo de elemento:

Article

Palabras claves no controlados:

Corrosión, Polarización potenciodinámica, Endurecimiento por precipitación, Aceros inoxidables

Materias:

T Tecnología > TA Ingeniería General y Civil

Divisiones:

Ingeniería Mecánica y Eléctrica

Usuario depositante:

Dra Citlalli Gaona

Creadores:

Creador	Email	ORCID
Villegas Tovar, José M.	NO ESPECIFICADO	NO ESPECIFICADO
Gaona Tiburcio, Citlalli	citlalli.gaonatbr@uanl.edu.mx	orcid.org/0000-0001-9072-3090
Lara Banda, María del Refugio	NO ESPECIFICADO	NO ESPECIFICADO
Maldonado Bandala, Erick	NO ESPECIFICADO	NO ESPECIFICADO
Baltazar Zamora, Miguel Ángel	NO ESPECIFICADO	NO ESPECIFICADO
Cabral Miramontes, José Ángel	NO ESPECIFICADO	NO ESPECIFICADO
Nieves Mendoza, Demetrio	NO ESPECIFICADO	NO ESPECIFICADO
Olguín Coca, Javier	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