| Summary: | 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.
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