TY - GEN
T1 - Corrosion mechanisms of iron and pipeline steels in bicarbonate and carbonate solutions - A review
AU - Eliyan, Faysal Fayez
AU - Alfantazi, Akram
PY - 2013
Y1 - 2013
N2 - This paper presents a mechanistic review on the corrosion reactions of iron and pipeline steels in bicarbonate and carbonate solutions. It consolidates key details about the corrosion reactions, from the early steps of dissolution till complete passivation, from a large scatter of electrochemical studies. It reviews some of the early and modern research in which voltammetric and polarization techniques are employed. It begins with discussing the controversial role(s) of bicarbonate with the dissolution reactions as being an impeder of film formation or as being a direct anodic catalyzer. It presents the steps and the rate-determining steps of formation of Fe(OH)2 and its interrelation with that of FeCO3. It describes the roles of bicarbonate and carbon-carrying adsorbents with the precipitation of FeCO3 as an independent outer-layer over Fe(OH)2. Depending on bicarbonate, carbonate, oxygen, hydroxyl, temperature and applied potential, FeCO3 transforms by oxidation or electro-oxidation to iron oxides, such as Fe2O3 and Fe3O4, in many paths, which are discussed. Finally, the paper outlines the governing reactions in carbonate solutions of dissolution and FeCO3-based passivation, and the possible transformations it undergoes.
AB - This paper presents a mechanistic review on the corrosion reactions of iron and pipeline steels in bicarbonate and carbonate solutions. It consolidates key details about the corrosion reactions, from the early steps of dissolution till complete passivation, from a large scatter of electrochemical studies. It reviews some of the early and modern research in which voltammetric and polarization techniques are employed. It begins with discussing the controversial role(s) of bicarbonate with the dissolution reactions as being an impeder of film formation or as being a direct anodic catalyzer. It presents the steps and the rate-determining steps of formation of Fe(OH)2 and its interrelation with that of FeCO3. It describes the roles of bicarbonate and carbon-carrying adsorbents with the precipitation of FeCO3 as an independent outer-layer over Fe(OH)2. Depending on bicarbonate, carbonate, oxygen, hydroxyl, temperature and applied potential, FeCO3 transforms by oxidation or electro-oxidation to iron oxides, such as Fe2O3 and Fe3O4, in many paths, which are discussed. Finally, the paper outlines the governing reactions in carbonate solutions of dissolution and FeCO3-based passivation, and the possible transformations it undergoes.
UR - https://www.scopus.com/pages/publications/84898736086
M3 - Conference contribution
AN - SCOPUS:84898736086
SN - 9789899885004
T3 - EUROCORR 2013 - European Corrosion Congress
BT - EUROCORR 2013 - European Corrosion Congress
T2 - European Corrosion Congress, EUROCORR 2013
Y2 - 1 September 2013 through 5 September 2013
ER -