Effect of initial CaCO3 saturation levels on the CO2 corrosion of 1Cr carbon steel

Riccardo Rizzo*, Rajan Ambat

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This paper presents the investigation on the effect of calcium on the corrosion behavior of 1Cr carbon steel under various levels of initial CaCO3 saturation ((Formula presented.)) of the bulk solutions. All the experiments were performed at 80°C in 1 wt% aqueous NaCl solution saturated with CO2. Four initial (Formula presented.) levels were investigated, namely 0, 0.6, 2, and 10. The corrosion process was followed using linear polarization resistance, potentiodynamic sweeps, and electrochemical impedance spectroscopy. The surface morphology of the corrosion products was analyzed with scanning electron microscopy and structural information using X-ray powder diffraction. Precipitation of a substitutional solid solution of FexCayCO3 (x + y = 1) was found on the steel surface. The growth of this layer was delayed by Ca2+ ions in the solution, but its protectiveness was not affected and was comparable with the pure FeCO3 corrosion product. No signs of localized corrosion were detected on the material.

Original languageEnglish
JournalMaterials and Corrosion
Number of pages15
ISSN0947-5117
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Calcim carbonate
  • Carbon steel
  • CO corrosion
  • Corrosion product film
  • Iron carbonate

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