a corrosion study of grain-refined 304l stainless steels produced by the martensitic process

نویسندگان

m. atapour

m. m dana

f. ashrafizadeh

چکیده

aisi 304l austenitic stainless steel with different grain sizes of 0.5 -12 μm was obtained through the martensiticprocess. corrosion behavior of different samples was investigated in a 0.5m hcl solution using open circuitpotential, potentiodynamic polarization and electrochemical impedance spectroscopy tests. also, the correlationbetween the grain size and pitting corrosion resistance was assessed by cyclic polarization experiments andimmersion tests combined with optical microscopy. the potentiodynamic polarization results demonstrated thatgrain refinement had little influence on the corrosion potential and corrosion current density. however, cyclicpolarization tests showed that the ultrafine grained steel (500 nm grain size) exhibited superior pitting resistance,as compared to the steel with the larger grain size (1- 12 μm). this behavior was confirmed by immersion tests inthe 0.5m hcl for 48 hours, thereby showing that the size and the number of pits were decreased by increasing thegrain size. the electrochemical impedance spectroscopy results also revealed that grain refinement enhanced thestability of the passive film of 304l stainless steel.

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عنوان ژورنال:
international journal of iron & steel society of iran

ناشر: iron & steel society of iran

ISSN 1735-4145

دوره 12

شماره 2 2015

میزبانی شده توسط پلتفرم ابری doprax.com

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