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51315-5671-Corrosion Mechanism of Mild Steel in CO? Aqueous Environment

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Product Number: 51315-5671-SG
ISBN: 5671 2015 CP
Author: Thu Tran
Publication Date: 2015
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A significant amount of research has been done to investigate the effect of CO2 (or carbonic acid) on the corrosion rate of mild steel. In 1975 de Waard and Milliams proposed a mechanism for CO2 corrosion where the author included the direct reduction of carbonic acid at the metal surface. This mechanism has been commonly assumed afterwards by other researchers (Nesic Pots etc.) to explain a higher corrosion rate of mild steel in presence of CO2 compared to a solution of strong acid at same pH. However another simpler pathway is to consider only the “buffering effect” of carbonic acid. This mechanism has been supported by Linter and Burstein in 1999 and Remita in 2008. In this case carbonic acid acts as a reservoir of hydrogen ions due to its ability to partially dissociate as a weak acid. Therefore carbonic acid can continuously provide hydrogen ions when those are consumed at the metal surface by the corrosion reaction.The goal of this research is therefore to clarify the CO2 corrosion mechanism to understand whether or not the direct reduction of carbonic acid needs to be taken into account in the development of a corrosion prediction model. By using electrochemical techniques results suggest that the presence of carbonic acid only affects the limiting current but has no influence on the charge transfer cathodic current. Hence the direct reduction of carbonic acid can be ignored in corrosion prediction models in this range of tested conditions. By assuming the “buffering effect” mechanism the proposed electrochemical model is able to provide a reasonable corrosion rate prediction for a broad range of conditions.
A significant amount of research has been done to investigate the effect of CO2 (or carbonic acid) on the corrosion rate of mild steel. In 1975 de Waard and Milliams proposed a mechanism for CO2 corrosion where the author included the direct reduction of carbonic acid at the metal surface. This mechanism has been commonly assumed afterwards by other researchers (Nesic Pots etc.) to explain a higher corrosion rate of mild steel in presence of CO2 compared to a solution of strong acid at same pH. However another simpler pathway is to consider only the “buffering effect” of carbonic acid. This mechanism has been supported by Linter and Burstein in 1999 and Remita in 2008. In this case carbonic acid acts as a reservoir of hydrogen ions due to its ability to partially dissociate as a weak acid. Therefore carbonic acid can continuously provide hydrogen ions when those are consumed at the metal surface by the corrosion reaction.The goal of this research is therefore to clarify the CO2 corrosion mechanism to understand whether or not the direct reduction of carbonic acid needs to be taken into account in the development of a corrosion prediction model. By using electrochemical techniques results suggest that the presence of carbonic acid only affects the limiting current but has no influence on the charge transfer cathodic current. Hence the direct reduction of carbonic acid can be ignored in corrosion prediction models in this range of tested conditions. By assuming the “buffering effect” mechanism the proposed electrochemical model is able to provide a reasonable corrosion rate prediction for a broad range of conditions.
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