Corrosion Performance of AISI 304 Stainless Steel in CO2-Saturated Brine Solution

H. Ruiz-Luna*, J. Porcayo-Calderón, A. G. Mora-García, I. López-Báez, L. Martinez-Gomez, J. Muñoz-Saldaña

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Abstract: Corrosion behavior of 304 stainless steel exposed to a NaCl (3.5 wt %) solution saturated with CO2 has been analyzed using electrochemical techniques including, potentiodynamic polarization, polarization resistance, and electrochemical impedance measurements. The stainless steel samples were evaluated having different surface and pre-oxidation treatments. The oxide scales formed on 304 stainless steel oxidized in different pO2 at 1100°C have also been studied and compared. Different morphologies and chemical composition of the oxide scales were observed after oxidation at low and high oxygen partial pressures. Oxide layers with high chromium content were formed on the ground sample pre-oxidized in Ar while iron-rich oxides were mainly formed under air atmosphere. The electrochemical corrosion results indicate that non-oxidized 304 SS exhibits the best corrosion performance followed by the ground sample heat-treated in argon. For the oxidized stainless steels, the differences in the electrochemical responses are associated to the morphological characteristics and composition of the oxide layer. Homogeneous and dense Cr-rich oxide scale provides protection to 304 SS during exposure to CO2-saturated solutions while the formation of Fe-oxides with porous morphology increases the corrosion rate of 304 stainless steel.

Original languageEnglish
Pages (from-to)1226-1235
Number of pages10
JournalProtection of Metals and Physical Chemistry of Surfaces
Volume55
Issue number6
DOIs
StatePublished - 1 Nov 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019, Pleiades Publishing, Ltd.

Keywords

  • Cr content
  • electrochemical corrosion
  • oxide layer
  • stainless steel
  • surface morphology

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