Elsevier

Corrosion Science

Volume 169, June 2020, 108640
Corrosion Science

A thermodynamic and kinetic study of the formation and evolution of corrosion product scales on 13Cr stainless steel in a geothermal environment

https://doi.org/10.1016/j.corsci.2020.108640Get rights and content
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Highlights

  • The inner corrosion products formed at low CO2 partial pressure are comprised nano-crystalline FeCr2O4.

  • Increasing CO2 partial pressure from 2.7 to 28.5 bar promote the formation of amorphous Cr(OH)3.

  • The low corrosion rate at low CO2 partial pressure was attributed to the formation of nano-crystalline FeCr2O4.

  • The thickness of the corrosion product film at 28.5br is 10 μm and this layer uniformly covered the entire surface.

  • Thermodynamics and kinetics influence on the formation and evolution of the corrosion products.

Abstract

The formation and evolution of corrosion product scales on 13Cr stainless steel at 200 °C and various CO2 partial pressures were investigated. Scanning electron microscope was used to show the physical nature of the scales formed at 0.27 MPa CO2. The thin non-uniform layer was identified as FeCr2O4 by Raman Spectroscopy with a thick Cr(OH)3 layer being determined at 2.85 MPa CO2. These results provide a guide to understanding the mechanisms of CO2 corrosion for 13Cr stainless steel exposed to high temperature and pressure and demonstrate the influence of thermodynamics and kinetics on the formation and evolution of the corrosion products.

Keywords

13Cr stainless steel
FIBs
Thermodynamic
Film evolution

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