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Development of a Prediction Model for High pCO2 Corrosion of Mild Steel

Most of the corrosion prediction models used for design of oil and gas lines carrying high pCO2 are valid up to 10-20 bars of pCO2 and are very conservative at higher pCO2 because they do not account for the effect of high pCO2 on the water chemistry and the corrosion mechanism. The present work was focused on developing a predictive tool for near-critical and supercritical CO2 corrosion of mild steel. It incorporates changes in the water chemistry module due to update solubility and dissociation equations changes in the electrochemical module due to the presence of a thick and porous corrosion product layer and consideration of an adsorption mechanism for H2CO3 at the steel surface. The comparison between experimental results and model predictions showed a good agreement under various pressure and temperature ranges.

Product Number: 51319-13157-SG
Author: Yoon-Seok Choi
Publication Date: 2019
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