Investigation of Sweet and Sour Corrosion of Mild Steel in Oilfield Environment by Polarization, Impedance, XRD and SEM Studies
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Metallic structures in the oil and gas production undergo severe degradation due to sweet and sourcorrosion caused by the presence of CO2 and H2S in the fluid environment. The corrosion behaviorof 304 austenitic stainless was investigated in the presence of varying concentrations of CO2 or H2Sand CO2 + H2S to understand the effect of the parameters either individually or in combination. Potentiodynamic polarization study revealed that a small amount of CO2 aided in the formation ofcalcareous deposit of protective layer on passive film of 304 steel, while increase in CO2 concentrationruptured the layer resulting in sweet corrosion. The presence of S2- damaged the passive and protectivelayer of the steel and higher levels increased the degradation rate. Electrochemical impedance studiesrevealed lower polarization resistance and impedance at higher concentration of CO2 or H2S, supportingthe outcomes of polarization study. XRD analysis revealed different types of iron carbides and ironsulphides corresponding to sweet and sour corrosion as the corrosion products, respectively. SEM analysisrevealed the presence of uniform, localized and sulphide cracking in sour corrosion and general corrosionwith protective carbide layer amid for sweet corrosion.
Abstract
Metallic structures in the oil and gas production undergo severe degradation due to sweet and sourcorrosion caused by the presence of CO2 and H2S in the fluid environment. The corrosion behaviorof 304 austenitic stainless was investigated in the presence of varying concentrations of CO2 or H2Sand CO2 + H2S to understand the effect of the parameters either individually or in combination. Potentiodynamic polarization study revealed that a small amount of CO2 aided in the formation ofcalcareous deposit of protective layer on passive film of 304 steel, while increase in CO2 concentrationruptured the layer resulting in sweet corrosion. The presence of S2- damaged the passive and protectivelayer of the steel and higher levels increased the degradation rate. Electrochemical impedance studiesrevealed lower polarization resistance and impedance at higher concentration of CO2 or H2S, supportingthe outcomes of polarization study. XRD analysis revealed different types of iron carbides and ironsulphides corresponding to sweet and sour corrosion as the corrosion products, respectively. SEM analysisrevealed the presence of uniform, localized and sulphide cracking in sour corrosion and general corrosionwith protective carbide layer amid for sweet corrosion.
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