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Prediction of General and Localized Corrosion of Corrosion-Resistant Alloys in Aggressive Environments

A previously developed theoretical framework has been extended to predict the general and localized corrosion of various corrosion resistant alloys (CRAs) including alloys 2507 S13Cr 2535 28 and 29 in complex aqueous systems relevant to oil and gas production and aggressive process environments. For this purpose the model calculates the corrosion rates corrosion potential and repassivation potential as a function of temperature alkalinity pH partial pressure of gases (including H2S) and concentration of various aggressive and inhibitive species and organic or inorganic acids. The corrosion rates and potential are computed using the mixed-potential theory by considering the main anodic and cathodic reactions coupled with a rigorous thermodynamic model to account for speciation by solving phase and chemical equilibria. The repassivation potential is calculated from a model that simulates the phenomena at the interface of the alloy and the occluded solution environment. To enhance the predictive capabilities of the model the parameters of the repassivation potential model have been generalized as a function of alloy composition environment composition and temperature. The results show that the developed model reasonably represents and predicts the experimental corrosion potential repassivation potential and corrosion rate data from the literature.

Product Number: 51319-12763-SG
Author: Ali Eslamimanesh
Publication Date: 2019
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