A mechanistic model for carbon dioxide corrosion of mild steel in the presence of protective iron carbonate films - Part 3: Film growth model

Nesic, S. and Lee, K. L. J. (2003) A mechanistic model for carbon dioxide corrosion of mild steel in the presence of protective iron carbonate films - Part 3: Film growth model. Corrosion: Journal of Science and Engineering, 59 7: 616-628.

Author Nesic, S.
Lee, K. L. J.
Title A mechanistic model for carbon dioxide corrosion of mild steel in the presence of protective iron carbonate films - Part 3: Film growth model
Journal name Corrosion: Journal of Science and Engineering
ISSN 0010-9312
Publication date 2003
Sub-type Article (original research)
Volume 59
Issue 7
Start page 616
End page 628
Total pages 13
Place of publication Houston, USA
Publisher Natl Assn Corrosion Eng
Collection year 2003
Language eng
Subject C1
291802 Heat and Mass Transfer Operations
780102 Physical sciences
Abstract A model of iron carbonate (FeCO3) film growth is proposed, which is an extension of the recent mechanistic model of carbon dioxide (CO2) corrosion by Nesic, et al. In the present model, the film growth occurs by precipitation of iron carbonate once saturation is exceeded. The kinetics of precipitation is dependent on temperature and local species concentrations that are calculated by solving the coupled species transport equations. Precipitation tends to build up a layer of FeCO3 on the surface of the steel and reduce the corrosion rate. On the other hand, the corrosion process induces voids under the precipitated film, thus increasing the porosity and leading to a higher corrosion rate. Depending on the environmental parameters such as temperature, pH, CO2 partial pressure, velocity, etc., the balance of the two processes can lead to a variety of outcomes. Very protective films and low corrosion rates are predicted at high pH, temperature, CO2 partial pressure, and Fe2+ ion concentration due to formation of dense protective films as expected. The model has been successfully calibrated against limited experimental data. Parametric testing of the model has been done to gain insight into the effect of various environmental parameters on iron carbonate film formation. The trends shown in the predictions agreed well with the general understanding of the CO2 corrosion process in the presence of iron carbonate films. The present model confirms that the concept of scaling tendency is a good tool for predicting the likelihood of protective iron carbonate film formation.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Carbon Dioxide
Carbon Dioxide Corrosion
Carbon Steel
Model
Prediction
Protective Films
Diffusion
Surface
Q-Index Code C1

 
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