Effect of turbulent flow on the anodic and cathodic kinetics of API X52 steel corrosion in H₂S containing solutions. A rotating cylinder electrode study

Abstract

This work presents the electrochemical kinetics results measured during the corrosion of API X52 pipeline steel immersed in aqueous environments, containing dissolved hydrogen sulfide (H 2 S) under turbulent flow conditions. In order to control the turbulent flow conditions, a rotating cylinder electrode (RCE) was used. Five different rotation rates were studied: 0 (or static conditions), 1000, 3000, 5000 and 7000 rpm. It was found that the turbulent flow increases the corrosion rate and the corrosion mechanism for X52 steel exhibits a significant dependence on mass transfer on the cathodic kinetics.

Corrosion mechanisms in aqueous solutions containing dissolved H2S. Part 1: Characterisation of H2S reduction on a 316L rotating disc electrode

“…In the eighties, Morris et al used a carbon steel rotating disc electrode to study corrosion in aqueous H 2 S systems of acid pH [15]. They concluded that H 2 S did not modify the cathodic process in the activation region, but they noticed also that H + diffusion control disappeared gradually with H 2 S. Measurements in controlled turbulent flow conditions were reported by Galvan-Martinez et al [16], with a rotating cylinder made of carbon steel. They examined the hypothesis of a direct H 2 S reduction according to Equation (6), but they noticed that the corrosion potential was situated in a region where the cathodic current was under H + mass transfer limitation.…”

Corrosion mechanisms in aqueous solutions containing dissolved H2S. Part 2: Model of the cathodic reactions on a 316L stainless steel rotating disc electrode

“…On the other hand, studies on H 2 S corrosion were mainly focused on anodic mechanism or on the formation of FeS scale formation [8,[16][17][18][19]. Electrochemical aspects of H 2 S benefited much less investigations, though it was found to have strong impact on the cathodic current density [1,8,20]. Recent electrochemical investigations were thus performed using well controlled hydrodynamic systems and show that H 2 S contribution might not fully be explained by a buffer effect [21,22].…”

Synthesis and Characterization of Oligomer 4-Vinylpyridine as A Corrosion Inhibitor for Mild Steel in CO₂ Saturated Brine Solution

“…The working electrode was inserted and operated at a speed of 1000 rpm through connection to a Pine Model MSRX electrode rotator. The rotating electrode with speed of 1000 rpm was prepared for simulating turbulent flow conditions related to data obtained in real life system [24][25][26][27]. The electrochemical cell was connected for LP measurement.…”