eprintid: 13554
rev_number: 7
eprint_status: archive
userid: 3393
dir: disk0/00/01/35/54
datestamp: 2020-08-28 14:02:56
lastmod: 2020-08-28 14:02:56
status_changed: 2020-08-28 14:02:56
type: article
metadata_visibility: show
creators_name: Loto, R. T.
title: Effect of SO42−and Cl−anionic attack on the localized corrosion resistanceand morphology of 409 ferritic stainless steel
ispublished: pub
subjects: T1
subjects: TJ
divisions: sch_eng
full_text_status: public
abstract: The corrosion polarization behaviour and optical characterization of 409 ferritic stainless steel (SS409) in 0.25 MH2SO4(at specific NaCl concentration), 0.375 M H2SO4and 0.5 M H2SO4was evaluated with potentiodynamicpolarization technique, open circuit potential measurement and optical microscopy characterization. Resultsshowed the SS409 corrosion rate is proportional to the concentration of SO42−and Cl−anions in the electrolyte.At 0.25 M H2SO4, SS409 corroded at a rate of 7.29 mm/y; addition of 0.125% NaCl accelerated the corrosion rateto 16.75 mm/y coupled with a corresponding increase in corrosion current density from 6.71 × 10−4Acm2to3.08 × 10−3Acm2. Further increase in Cl−anion concentration to 0.75% NaCl increased the corrosion rate to19.49 mm/y. At 0.25 M H2SO4the pitting current value is 1 × 10−4A, this value increased to 1.03 × 10−4Aat0.25 M H2SO4(0.125% NaCl) and 8.40 × 10−4A at 0.25 M H2SO4(0.5% NaCl). Beyond 0.5% NaCl, passivationbehavior was completely absent. Intergranular cracks, large macro-pits and numerous micro-pits were observedfor SS409 from 0.25 M H2SO4(0.75% NaCl) due to Cr depletion and dissolution of inclusions. SS409 from 0.5 MH2SO4showed the presence of deepened intergranular cracks, shallow pits and a deteriorated surface due to theaction of SO42−anions. The morphology of SS409 in 0.25 M H2SO4+ 0.125% NaCl showed slight deteriorationin addition to enlarged micro-pits
date: 2019
date_type: published
publication: Results in Physics
volume: 12
pagerange: 738-742
refereed: TRUE
citation:   Loto, R. T.  (2019) Effect of SO42−and Cl−anionic attack on the localized corrosion resistanceand morphology of 409 ferritic stainless steel.  Results in Physics, 12.  pp. 738-742.      
document_url: http://eprints.covenantuniversity.edu.ng/13554/1/1-s2.0-S2211379718325476-main%20%281%29.pdf