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Electrochemical Noise Analysis in Passivated Martensitic Precipitation-Hardening Stainless Steels in H2SO4 and NaCl Solutions

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Publicado en:Metals vol. 15, no. 8 (2025), p. 837-857
Autor principal: Almeraya-Calderon Facundo
Otros Autores: Villegas-Tovar, Miguel, Maldonado-Bandala Erick, Nieves-Mendoza, Demetrio, Méndez-Ramírez, Ce Tochtli, Baltazar-Zamora Miguel Angel, Olguín-Coca Javier, Lopez-Leon, Luis Daimir, Santiago-Hurtado, Griselda, Almaguer-Cantu Verónica, Jaquez-Muñoz, Jesus Manuel, Gaona-Tiburcio Citlalli
Publicado:
MDPI AG
Materias:
Aeronautics
Microstructural analysis
Sulfuric acid
Investigations
Martensitic stainless steel
Precipitation hardening steels
Sodium chloride
Stainless steels
Preventive maintenance
Corrosion tests
Aircraft
Precipitation hardening
Passivity
Electrolytes
Electrochemical analysis
Corrosion mechanisms
Oxide coatings
Spectrum analysis
Corrosion resistance
Electrochemical noise
Ductility
Microscopy
Hardenability
Stainless steel
Nitric acid
Aerospace materials
Actuators
Landing gear
Acceso en línea:Citation/Abstract
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Resumen:Precipitation-hardenable stainless steels (PHSS) are widely used in various applications in the aeronautical industry such in as landing gear supports, actuators, and fasteners, among others. This research aims to study the pitting corrosion behavior of passivated martensitic precipitation-hardening stainless steel, which underwent passivation for 120 min at 25 °C and 50 °C in citric and nitric acid baths before being immersed in solutions containing 1 wt.% sulfuric acid (H2SO4) and 5 wt.% sodium chloride (NaCl). Electrochemical characterization was realized employing electrochemical noise (EN), while microstructural analysis employed scanning electron microscopy (SEM). The result indicates that EN reflects localized pitting corrosion mechanisms. Samples exposed to H2SO4 revealed activation–passivation behavior, whereas those immersed in NaCl exhibited pseudo-passivation, indicative of an unstable oxide film. Current densities in both solutions ranged from 10−3 to 10−5 mA/cm2, confirming susceptibility to localized pitting corrosion in all test conditions. The susceptibility to localized attack is associated with the generation of secondary oxides on the surface.
ISSN:2075-4701
DOI:10.3390/met15080837
Fuente:Materials Science Database