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51318-10895-The pitting corrosion behavior of carbon steel in presence of sulfate-reducing bacteria under H2S

Picture for The pitting corrosion behavior of carbon steel in presence of sulfate-reducing bacteria under H2S
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Corrosion behaviors on carbon steel - in presence of sulfate reducing bacteria (SRB) - were studied via weight loss methods and electrochemical tests including polarization curve and EIS measurements.

Product Number: 51318-10895-SG
Author: Ma Lei / Xie Junfeng / Xiong MaoXian / Li Yan / Zhao Mifeng / Wang Hua
Publication Date: 2018
Industry: Science of Corrosion
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API-RP38 culture medium was used to culture sulfate SRB isolated from an oilfield wastewater sample. SRB test bottle method was used to verify bacterial activity, and SEM was employed for identifying the microbial morphology. Corrosion behaviors were studied via weight loss methods and electrochemical tests including polarization curve and EIS measurements. The results of corrosion weight loss show that the corrosion rate of carbon steel was accelerated significantly after the inoculation of SRB, characterized by pitting corrosion. The real oilfield conditions with high content of H2S and high salinity were simulated for tests and the results indicate that severe pitting corrosion also took place under the conditions of SRB which survived in the unfavorable environments. The results of polarization curves show that, in H2S environments with the existence of SRB, the corrosion potential of carbon steel negatively shifted and the corrosion current density increased as the passage of testing time. However, without SRB, the corrosion potential shifted positively and the corrosion current density decreased due to the protection of uniform corrosion product film. EIS results show that, with the existence of SRB, both the corrosion scale impedance and charge transfer impedance decreased as the passage of testing time. As the time lengthened, this tendency turned more apparent. While under the sterilized conditions, both the corrosion scale impedance and charge transfer impedance increased as the testing time elapsed.

Key words: sulfate reducing bacteria; carbon steel; pitting corrosion; hydrogen sulfide

API-RP38 culture medium was used to culture sulfate SRB isolated from an oilfield wastewater sample. SRB test bottle method was used to verify bacterial activity, and SEM was employed for identifying the microbial morphology. Corrosion behaviors were studied via weight loss methods and electrochemical tests including polarization curve and EIS measurements. The results of corrosion weight loss show that the corrosion rate of carbon steel was accelerated significantly after the inoculation of SRB, characterized by pitting corrosion. The real oilfield conditions with high content of H2S and high salinity were simulated for tests and the results indicate that severe pitting corrosion also took place under the conditions of SRB which survived in the unfavorable environments. The results of polarization curves show that, in H2S environments with the existence of SRB, the corrosion potential of carbon steel negatively shifted and the corrosion current density increased as the passage of testing time. However, without SRB, the corrosion potential shifted positively and the corrosion current density decreased due to the protection of uniform corrosion product film. EIS results show that, with the existence of SRB, both the corrosion scale impedance and charge transfer impedance decreased as the passage of testing time. As the time lengthened, this tendency turned more apparent. While under the sterilized conditions, both the corrosion scale impedance and charge transfer impedance increased as the testing time elapsed.

Key words: sulfate reducing bacteria; carbon steel; pitting corrosion; hydrogen sulfide

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