Influence of delta ferrite on corrosion susceptibility of AISI 304 austenitic stainless steel
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Date
2016
Authors
Osoba, L.O.
Elemuren, R.A.
Ekpe, I.C.
Journal Title
Journal ISSN
Volume Title
Publisher
Cogent Engineering
Abstract
In the current study, the influence of delta (δ) ferrite on the corrosion
susceptibility of AISI 304 austenitic stainless steel was evaluated in 1Molar concentration of sulphuric acid (H2SO4) and 1Molar concentration of sodium chloride
(NaCl). The study was performed at ambient temperature using electrochemical
technique—Tafel plots to evaluate the corrosive tendencies of the austenitic stainless steel sample. The as-received (stainless steel) specimen and 60% cold-worked
(stainless steel) specimens were isothermally annealed at 1,100°C for 2 h and 1 h,
respectively, and quenched in water. The results obtained show that the heat-treated specimen and the 60% cold-worked plus heat-treated specimen exhibited higher
corrosion susceptibility than the as-received specimen, which invariably contained
the highest fraction of δ ferrite particles. The finding shows that the presence of δ
ferrite, in which chromium (Cr), the main corrosion inhibitor segregates, does not degrade and or reduces the resistance to aqueous corrosion of the austenitic stainless
steel material.
Description
Keywords
austenitic stainless steel; delta ferrite; corrosion rates; Tafel; polarization resistance
Citation
Osoba, L.O.; Elemuren, R.A. and Ekpe, I.C. (2016). Influence of delta ferrite on corrosion susceptibility of AISI 304 austenitic stainless steel. Cogent Engineering; 3: 1150546