| ZHAO Guo-xian,DING Lang-yong,LIU Ran-ran,WANG Ying-chao,ZHANG Si-qi,DONG Bo-xing,SONG Yang.Film Characteristics and Corrosion Behavior of Anti-microbial Corrosion Pipe in SRB/CO2 Environment[J],52(9):220-231 |
| Film Characteristics and Corrosion Behavior of Anti-microbial Corrosion Pipe in SRB/CO2 Environment |
| Received:August 16, 2022 Revised:January 11, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.018 |
| KeyWord:anti-microbial corrosion pipe sulfate reducing bacteria CO2 biofilm |
| Author | Institution |
| ZHAO Guo-xian |
School of Materials Science and Engineering, Xi'an University of Petroleum, Xi'an , China |
| DING Lang-yong |
School of Materials Science and Engineering, Xi'an University of Petroleum, Xi'an , China |
| LIU Ran-ran |
School of Materials Science and Engineering, Xi'an University of Petroleum, Xi'an , China |
| WANG Ying-chao |
School of Materials Science and Engineering, Xi'an University of Petroleum, Xi'an , China |
| ZHANG Si-qi |
School of Materials Science and Engineering, Xi'an University of Petroleum, Xi'an , China |
| DONG Bo-xing |
School of Materials Science and Engineering, Xi'an University of Petroleum, Xi'an , China |
| SONG Yang |
Xi'an Moore Petroleum Engineering Laboratory Limited Company, Xi'an , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to observe the corrosion characteristics of sulfate reducing bacteria (SRB)/saturated CO2 on anti-microbial corrosion pipe through experiments, so as to explore the effect of SRB on CO2 corrosion. Through the bacterial culture experiment in the biochemical incubator at a constant temperature of 40 ℃, the 15-day growth curve of planktonic SRB in the environment with and without saturated CO2 was obtained by the method of blood plate counting. The effects of SRB, saturated CO2 and SRB + saturated CO2 (three different environments) on the corrosion rate were obtained by immersion corrosion test in the biochemical incubator with a constant temperature of 40 ℃. The surface morphologies after corrosion in three different environments were analyzed by scanning electron microscope (SEM). The composition and phase composition of corrosion products in three different environments were analyzed by energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD). The corrosion electrochemical tests were carried out in a 40 ℃ water bath to study the effects of three different environments on the corrosion of microbial corrosion pipes. The results of bacterial culture in the presence and absence of saturated CO2 showed that CO2 could be used as a delayed carbon source for the growth of SRB and provide energy for the secondary growth of SRB. The results of corrosion immersion test showed that the corrosion rate was the highest in saturated CO2 environment, the second in SRB environment and the lowest in SRB + saturated CO2 environment. The results of SEM analysis indicated that the corrosion product film formed in CO2 environment showed serious cracking phenomenon, and the corrosion was the most serious. Many bacteria gathered together in SRB environment and adhered to EPS to form a similar network biofilm, which was more and relatively continuous than that in the SRB + saturated CO2 environment. The results of EDS analysis showed that in the environment containing SRB, the sulfur element detected in the environment was higher than that in the aseptic environment due to the reduction of sulfate to H2S after the corrosion reaction of SRB, the reaction of H2S with Fe2+ to form FeS and the contact of a little FeS with air to form simple substance S. The results of XRD analysis showed that in saturated CO2 environment, the corrosion products were mainly in FeCO3, Fe2O3 and Fe3O4, in the SRB environment, the corrosion products were mainly FeS, FePS3, Fe3O4, Fe2O3 and simple substance S, and in the SRB + saturated CO2 environment, only Fe diffraction peaks were detected. The electrochemical test results showed that in the three environments, the slope of cathodic Tafel was larger than that of anode Tafel, and the corrosion was controlled by cathodic reaction. The whole corrosion process was affected by CO2 corrosion, normal bacterial growth and metabolism, and the film was easy to crack and fall off. After immersion for 15 days, the polarization resistance showed the law of Rp(SRB) > Rp(SRB+saturated CO2) > Rp(CO2) corrosion and SRB corrosion affected each other. In SRB + saturated CO2 environment, the formation of the biofilm improves the adhesion of the corrosion product film, reduces the corrosive ions passing through the film, and slows down the corrosion, so the existence of SRB can obviously inhibit the CO2 corrosion of the anti-microbial corrosion pipe. |
| Close |
|
|
|