Faysal Fayez Eliyan

Mechanisms of Corrosion and Electrochemical Significance of Metallurgy and Environment with Corrosion of Iron and Steel in Bicarbonate and Carbonate Solutions—A Review

This paper presents an electrochemical review on the corrosion behavior of iron and steel in bicarbonate and carbonate solutions. The mechanisms of dissolution and passivation are at first consolid...

Voltammetric Analysis on the Formation of Fe(OH)2 and FeCO3, and on the Reactivity of Passivation of Steel in Carbonate Solutions

This paper examines the simultaneous dissolution and the formation of Fe(OH)2 and FeCO3 in carbonate solutions. It re-evaluates some of the early findings on Fe(OH)2 outlining that it forms with kinetics interfering with that of FeCO3. The formation and electroreactivity of FeCO3 are investigated in detail. The electrochemical significance of the thickness and reactivity of the passive films are linked to the carbonate concentration, cyclic voltammetry scans, and the cathodic reduction of oxygen and water. The cathodic currents were indicative of the thickness and reactivity of the passive films, which increased with the carbonate concentration and higher cycling.

Modeling Corrosion Reactions of Steel in a Dilute Carbonate Solution

This research models the corrosion reactions of a high-strength steel in an aerated, dilute, carbonate solution during a single-cycle voltammetry. Based on a previous study (Eliyan et al. in J Mater Eng Perform 24(6):1-8, 2015) and a literature survey, the corrosion reactions of the cathodic reduction, anodic dissolution, and passivation, as well as the interfacial interactions and the chemistry of the corrosion products are illustrated in schematics. The paper provides a visual guide on the corrosion reactions for steel in carbonate solutions based on the available mechanistic details that were reported and are still being investigated in literature.

Investigating the Significance of Bicarbonate with the Corrosion of High-Strength Steel in CO 2 -Saturated Solutions

This paper presents an electrochemical study on the corrosion behavior of API-X100 steel, heat-treated to have microstructures similar to those of the heat-affected zones (HAZs) of pipeline welding, in bicarbonate-CO2 saturated solutions. The corrosion reactions, onto the surface and through the passive films, are simulated by cyclic voltammetry. The interrelation between bicarbonate concentration and CO2 hydration is analyzed during the filming process at the open-circuit potentials. In dilute bicarbonate solutions, H2CO3 drives more dominantly the cathodic reduction and the passive films form slowly. In the concentrated solutions, bicarbonate catalyzes both the anodic and cathodic reactions, only initially, after which it drives a fast-forming thick passivation that inhibits the underlying dissolution and impedes the cathodic reduction. The significance of the substrate is as critical as that of passivation in controlling the course of the corrosion reactions in the dilute solutions. For fast-cooled (heat treatment) HAZs, its metallurgical significance becomes more comparable to that of slower-cooled HAZs as the bicarbonate concentration is higher.

External oil pipeline corrosion of near-fusion heat-affected zones simulated from high-strength steels

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