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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.
Details
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
; Villegas-Tovar, Miguel 1 ; Maldonado-Bandala Erick 2 ; Nieves-Mendoza, Demetrio 2 ; Méndez-Ramírez, Ce Tochtli 2 ; Baltazar-Zamora Miguel Angel 2
; Olguín-Coca Javier 3
; Lopez-Leon, Luis Daimir 3
; Santiago-Hurtado, Griselda 4 ; Almaguer-Cantu Verónica 5 ; Jaquez-Muñoz, Jesus Manuel 6
; Gaona-Tiburcio Citlalli 1
1 Universidad Autónoma de Nuevo León, FIME, Centro de Investigación e Innovación en Ingeniería Aeronáutica (CIIIA), San Nicolás de los Garza 66455, Mexico; [email protected] (F.A.-C.); [email protected] (M.V.-T.)
2 Facultad de Ingeniería Civil, Universidad Veracruzana, Xalapa 91000, Mexico; [email protected] (E.M.-B.); [email protected] (D.N.-M.); [email protected] (M.A.B.-Z.)
3 Área Académica de Ingeniería y Arquitectura, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km. 4.5., Pachuca 42082, Mexico; [email protected] (J.O.-C.); [email protected] (L.D.L.-L.)
4 Facultad de Ingeniería Civil, Universidad Autónoma de Coahuila, Torreón 27276, Mexico; [email protected]
5 Instituto de Biotecnología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza 66455, Mexico; [email protected]
6 Centro de Ciencias de la Ingeniera, Universidad Autonóma de Aguascalientes, Aguascalientes 20340, Mexico; [email protected]