Synergic effects of sulfate-reducing bacteria and C[O.sub.2] in produced water on carbon steel corrosion/Efecto sinergico de las bacterias sulfato-reductoras y el C[O.sub.2] en agua de produccion sobre la corrosion del acero al carbono/Efeito sinergico das bacterias sulfato-redutoras e o C[O.sub.2] em agua de producao sobre a corrosao do aco carbono

• Published in: Interciencia Vol. 38; no. 3; p. 209
• Main Authors: De Turris S., Antonio J, de Romero, Matilde F, Papavinasam, Sankara, Ocando, Lisseth
• Format: Journal Article
• Language: Spanish
• Published: Interciencia Association 01.03.2013
• ISSN: 0378-1844

The effects of C[O.sub.2] and of a mixed culture of sulfate-reducing bacteria (SRB) isolated from an oil industry field on general and localized corrosion of carbon steel in synthetic produced water were analyzed. The experiments were carried out in a rotating cage. The synthetic produced water was saturated with various C[O.sub.2] concentrations. During the trials the pH was measured, planktonic SRB were counted and the concentrations of sulfur, sulfate, Fe, Ca and Mg ions were measured in the solution. After the experiments, sessile SRB and mass loss in the carbon steel coupons were measured, the corrosion products were identified by scanning electron microscopy and X-ray diffraction, while the corrosion morphology was determined by optical microscopy, scanning electron microscopy and also using a laser profilometer. It was found that the general and localized corrosion rate of carbon steel are doubled in solutions containing 10% C[O.sub.2] and 10% SRB in comparison with the solutions containing either C[O.sub.2] or SRB (synergistic effect). High C[O.sub.2] concentrations inhibited planktonic and sessile SRB growth.