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J. Postlethwaite

Bio: J. Postlethwaite is an academic researcher from Institute for Energy Technology. The author has contributed to research in topics: Tafel equation & Polarization (electrochemistry). The author has an hindex of 2, co-authored 2 publications receiving 450 citations.

Papers
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TL;DR: In this paper, a predictive model was developed for uniform carbon dioxide (CO2) corrosion, based on modeling of individual electrochemical reactions in a water-CO2 system, taking into account the reactions of hydrogen ion (H+) reduction, carbonic acid (H2CO3) reduction, direct water reduction, oxygen reduction, and anodic dissolution of iron.
Abstract: A predictive model was developed for uniform carbon dioxide (CO2) corrosion, based on modeling of individual electrochemical reactions in a water-CO2 system. The model takes into account the electrochemical reactions of hydrogen ion (H+) reduction, carbonic acid (H2CO3) reduction, direct water reduction, oxygen reduction, and anodic dissolution of iron. The required electrochemical parameters (e.g., exchange current densities and Tafel slopes) for different reactions were determined from experiments conducted in glass cells. The corrosion process was monitored using polarization resistance, potentiodynamic sweep, electrochemical impedance, and weight-loss measurements. The model was calibrated for two mild steels over a range of parameters: temperature (t) = 20°C to 80°C, pH = 3 to 6, partial pressure of CO2 (PCO2) = 0 bar to 1 bar (0 kPa to 100 kPa), and ω = 0 rpm to 5,000 rpm (vp = 0 m/s to 2.5 m/s). The model was applicable for uniform corrosion with no protective films present. Performance of...

468 citations

01 Oct 1995
TL;DR: In this article, a predictive model of CO-sub 2 corrosion is presented, based on modelling of individual electrochemical reactions occurring in a water CO −sub 2 system, which takes into account the following reactions: hydrogen ion reduction, carbonic acid reduction, direct water reduction, oxygen reduction and anodic dissolution of iron.
Abstract: A predictive model of CO{sub 2} corrosion, based on modelling of individual electrochemical reactions occurring in a water CO{sub 2} system, is presented. The model takes into account the following electrochemical reactions: hydrogen ion reduction, carbonic acid reduction, direct water reduction, oxygen reduction and anodic dissolution of iron. The required electrochemical parameters in the model such as: exchange current densities and Tafel slopes for different reactions are determined from experiments conducted in glass cells. In those experiments the corrosion process was monitored with the following electrochemical measuring techniques: polarization resistance, potentiodynamic sweep, electrochemical impedance in addition to weight loss measurements. The model has been calibrated for two different mild steels over a wide range of parameters: t = 20--80C, pH 3--6, p(CO{sub 2})= 0--1 bar, {omega} = 0--5,000 rpm. In its present stage of development the model applies for the case of uniform corrosion with no protective films present. Performance of the model is validated by comparing the predictions with results from independent loop experiments. The predictions made with the present model were also compared with performance of other CO{sub 2} corrosion prediction models. Compared to the previous largely empirical models, the present model gives a much clearer picture ofmore » the corrosion mechanisms and of the effect of key parameters.« less

25 citations


Cited by
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Srdjan Nesic1
TL;DR: The state-of-the-art in modelling of internal corrosion of oil and gas pipelines made from carbon steel is reviewed in this article, which covers the effects of: electrochemistry, water chemistry, formation of protective scales and scales, temperature, flow, steel, inhibition, water condensation, glycol/methanol and localized attack.

940 citations

Journal ArticleDOI
TL;DR: In this article, a review summarizes the corrosion inhibition of steel materials in acidic media, focusing on HCl solutions, lower-grade steels, and elevated temperatures, and also devoted to corrosion inhibitor formulation design.

927 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of dissolved carbon dioxide on the electrochemical reactions of two pipeline steels: a low alloy steel and a 13% Cr stainless steel were investigated, and the role of pH buffer and electrolytic anion was discussed, and it was shown that at high cathodic overpotentials the carbon component of the dissolved CO2 is reduced, probably to carbon monoxide, and this reduces the rate of hydrogen evolution by cathode poisoning.

303 citations

Journal ArticleDOI
TL;DR: In this paper, the evolution of interfacial phenomena during CO2 corrosion of C1018 carbon steel was characterized by EIS (Electrochemical Spectroscopy Impedance) and LPR (Linear Polarization Resistance).

257 citations

Journal ArticleDOI
TL;DR: In this article, the corrosion inhibition and adsorption behavior of 2-undecyl-1-ethylamino imidazoline (2UEI) on N80 mild steel in CO2-saturated 3% NaCl solutions was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy techniques and SEM observation.

239 citations