Electrochemical Corrosion Behavior of Passivated Precipitation Hardening Stainless Steels for Aerospace Applications

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چکیده

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

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ژورنال

عنوان ژورنال: Metals

سال: 2023

ISSN: ['2075-4701']

DOI: https://doi.org/10.3390/met13050835