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Kinetics of Iron Dissolution: A New Approach for Modeling the Anodic Potentiodynamics Based on Transient Analysis

Picture for Kinetics of Iron Dissolution: A New Approach for Modeling the Anodic Potentiodynamics Based on Transient Analysis
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Although extensive research has been carried out on modeling the cathodic potentiodynamic sweep during the corrosion of iron/steel, previous studies have not been able to layout a systematic approach to mechanistically describe the kinetics and model anodic dissolution. This study offers some insights into the mechanistic modeling of electrochemical anodic reactions at different experimental conditions. For iron dissolution, there are two well-known mechanisms valid for strong acid solutions (pH ≤ 4) in the literature; namely, the “catalytic mechanism” proposed by Heusler et al., and the “consecutive mechanism” proposed by Bockris et al.

Product Number: 51323-19073-SG
Author: Mohiedin Bagheri Hariri, Bruce Brown, Srdjan Nesic
Publication Date: 2023
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In this work, a new approach is introduced to determine the kinetic constants of the elementary steps involved in the overall reaction of iron anodic dissolution. A procedure based on transient analysis is established, for the first time, that enables the estimation of a series of kinetic parameters that can be used for modeling the anodic potentiodynamics over a wide range of environmental conditions. The findings of the present research enhance the ability of explaining how different environmental factors (CO2 presence, pH, temperature, steel type, etc.) mechanistically affect the kinetics of iron dissolution.

In this work, a new approach is introduced to determine the kinetic constants of the elementary steps involved in the overall reaction of iron anodic dissolution. A procedure based on transient analysis is established, for the first time, that enables the estimation of a series of kinetic parameters that can be used for modeling the anodic potentiodynamics over a wide range of environmental conditions. The findings of the present research enhance the ability of explaining how different environmental factors (CO2 presence, pH, temperature, steel type, etc.) mechanistically affect the kinetics of iron dissolution.

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