An electrochemical and X-ray computed tomography investigation of the effect of temperature on CO2 corrosion of 1Cr carbon steel

Riccardo Rizzo*, Sina Baier, Magdalena Rogowska, Rajan Ambat

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This paper presents the investigation on the effect of temperature on the corrosion behavior of 1Cr carbon steel at 40 °C and 80 °C in 1 wt. % NaCl aqueous solution saturated with CO2. The evolution of the corrosion process was followed with Linear Polarization Resistance (LPR) and Electrochemical Impedance Spectroscopy (EIS). X-ray Computed Tomography was used for 3D structure of the scale ex-situ to correlate with electrochemical investigation. Additionally, the surface morphology of the corrosion products was analyzed with Scanning Electron Microscopy (SEM) and structural information using X-ray powder diffraction (XRD). Tomography results showed protective FeCO3 formation with three different layers at 80 °C, where corrosion underneath the scale was uniform. The 3D image of the corrosion products formed at 40 °C showed loose and porous, and consequently did not reduce the corrosion rate unlike for 80 °C. Low temperature test also showed signs of localized corrosion beneath the corrosion products.
Original languageEnglish
Article number108471
JournalCorrosion science
ISSN0010-938X
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Carbon steel A
  • Polarization B
  • EIS B
  • Oxidation C
  • Interfaces C

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