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Analysis of corrosion of carbon steel in sour and sweet environments. Non-classical nature of localized pitting corrosion of carbon steel in sour and sweet environments explained. Description of a model to predict internal pitting corrosion of carbon steel under sour and sweet environments,
The nature of corrosion of carbon steel in sour and sweet environments has been analyzed. The non-classical nature of localized pitting corrosion of carbon steel in sour and sweet environments has been explained. A model to predict internal pitting corrosion of carbon steel under sour and sweet environments has been described. Additional data on the effects of temperature and partial pressure of CO2 has been presented based on mass loss, scanning electron microscopy (SEM), and laser profilometer analyses to expand the applicability of the model. Key Words: pitting corrosion, sour corrosion, sweet corrosion, oil and gas, laser profilometer
The sour model had been previously developed to predict localized internal pitting corrosion of carbon steel. This model included the effects of carbon dioxide (CO2), crude oil, temperature, pressure, flow, sulfur, sulfates, bicarbonates, chlorides and microbiologically influenced corrosion (MIC). The paper discusses field use, merits, precautions and parameterization in using the model.
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A parametric study of sour corrosion was conducted and is presented in this paper to provide a better understanding of corrosion in sour gas environments. Various parameters that are known to affect the corrosion rate were evaluated and their impacts on corrosion rate are discussed.
A comprehensive parametric study was performed using a small-scale laboratory setup with the aim of investigating the occurrence of localized corrosion of mild steel in marginally sour environments.