Imperial College London
Portrait Picture

ProfessorMaryRyan

Central Faculty, Office of the Provost

Vice-Provost (Research and Enterprise)
 
 
 
//

Contact

 

+44 (0)20 7594 6755m.p.ryan

 
 
//

Location

 

B338Royal School of MinesSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Alsalem:2023:10.1016/j.cej.2022.138966,
author = {Alsalem, MM and Ryan, MP and Campbell, AN and Campbell, KS},
doi = {10.1016/j.cej.2022.138966},
journal = {Chemical Engineering Journal},
title = {Modelling of CO<inf>2</inf> corrosion and FeCO<inf>3</inf> formation in NaCl solutions},
url = {http://dx.doi.org/10.1016/j.cej.2022.138966},
volume = {451},
year = {2023}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The corrosivity of carbon dioxide (CO2) corrosion and iron carbonate (FeCO3) layer formation in sodium chloride (NaCl) solutions (1–12 % w/v) were investigated through electrochemical experiments and modelling. Relying on electrochemical measurements (Potentiodynamic polarisation) and simplified current density expressions (employing only H+ activity), reaction enthalpies (ΔH) and rate constants (Kr) for Fe dissolution, H2 evolution and H2O reduction reactions were estimated over a temperature range of 40–80 °C. Additionally, a revised FeCO3 precipitation rate expression was developed based on a newly derived FeCO3 solubility product (Ksp), integrating the effects of temperature and ionic strength (using activity coefficients). Collectively, this yielded a new CO2 corrosion prediction model accounting for the presence of a developing layer of FeCO3 in NaCl solutions. The model was validated over a broad range of conditions (pH, temperature, pressure and NaCl concentrations) by employing the corrosion rate and FeCO3 characteristics as metrics. Notably, it was shown that the activities of dissolved CO2 and Cl− were not essential to predict the electrochemical response of anodic processes. Furthermore, it was demonstrated that increasing NaCl concentration resulted in a complexly evolving environment where porous, less protective FeCO3 layers were formed.
AU  - Alsalem,MM
AU  - Ryan,MP
AU  - Campbell,AN
AU  - Campbell,KS
DO  - 10.1016/j.cej.2022.138966
PY  - 2023///
SN  - 1385-8947
TI  - Modelling of CO<inf>2</inf> corrosion and FeCO<inf>3</inf> formation in NaCl solutions
T2  - Chemical Engineering Journal
UR  - http://dx.doi.org/10.1016/j.cej.2022.138966
VL  - 451
ER  -
Download