Abstract
In this work corrosion of mild steel affected by carbon dioxide was studied using a simulation model developed by Nordsveen M. and Nesic S. Using this comprehensive model of the uniform corrosion made possible to predict of corrosion rate of steel in the carbonic acid medium and the influence of different conditions on the anticorrosive property of coated electrode has been investigated. 1D model of corrosion process includes Butler-Volmer and Tafel equations and takes into account both the kinetics of anodic dissolution of an iron and electrochemical discharge of carbonic acid, water and hydrogen ions. The model has been created in COMSOL Multiphysics software and further improvement of this model allowed studying the influence of parameters such as solution composition, the partial pressure of CO2, temperature and flow velocity of the solution on the corrosion rate of the steel. The results of numerical simulation demonstrate that the use of conductive polymerpolypyrrole/ SiO2 composite as an anti-corrosive resin coating reduces the corrosion rate of mild steel by 7 times or more, depending on pH, temperature and flow rate. Furthermore, increasing of flow velocity from 0.1 to 10 m/s affects to the removal of corrosion products from the surface of mild steel and as a result corrosion rate raises from 0.3 to 0.45 mm/year at a temperature of 80 °C and pH=4.
Highlights
Corrosion of industrial metals is one of the actual problems faced by science owing to its disastrous impact on the environment
The corrosion behavior of mild steel, MS coated with polypyrrole and MS coated with silica oxide doped polypyrrole layer in carbon dioxide-saturated mildly acidic solutions were investigated varying pH of the solution, temperature regime and flow velocity
The concentration distribution curves demonstrate that the concentration of Fe2+ ions is significantly higher in the near-electrode layer due to the dissolution of steel electrode (a) and mild steel coated with polypyrrole (b), respectively
Summary
Corrosion of industrial metals is one of the actual problems faced by science owing to its disastrous impact on the environment. The surface degradation rate caused by corrosion depends on numerous factors including pH of the solution, partial pressure of carbon dioxide gas, temperature, flow conditions and metal or alloy composition. There is a need for developing a model that would simulate corrosion mild steel/conductive polymer/metal oxides or another doping agent composite electrode in CO2, H2S containing solutions including iron carbonate effect. The electrochemical module of COMSOL Multiphysics software was used for computing the corrosion rate in acidic solution based on the kinetics of electrode processes occur on anode and cathode part of steel surface by taking into account solution composition and flow conditions. The objective of this work includes the prediction of the corrosion rate of steel electrode in carbon dioxide containing an acidic aqueous solution using earlier developed models and its further enhancement
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