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| GROWTH CHARACTERISTICS OF THERMOPHILE SULFATE-REDUCING BACTERIA AND ITS EFFECT ON CARBON STEEL |
| LIU Hongfang; LIU Tao |
| Key Laboratory of Materials Chemistry Service Failure; Department of Chemistry;Huazhong University of Science and Technology; Wuhan 430074 |
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Abstract The API-RP38 medium was used to culture the thermophile sulfate-reducing bacteria (SRB) isolated from Bohai oilfield，and the bacteria was preliminarily identified according to its growth characteristics. Additionally, electrochemical means were taken to study the effect of the bacteria on carbon steel. The results show that the growth cycle of the bacteria is shorter than that cultured under normal temperature. The optimum growth temperature of the bacteria is at 60℃ within the growth temperature range from 40℃ to 80℃. The growth pH ranges from 6.0 to 7.6, and the optimum is about 7.0. The mass loss measurement at 60 ℃ in the culture medium indicates that the corrosion on carbon steel in thermophile SRB solution is 2.6 times more serious than that in the blank medium. As an uneven biofilm occurs on the carbon steel surface，energy dispersive spectrometer (EDS) analysis indicates that the corrosion products have various FeSx structures in the uneven biofilm. The free corrosion potential increases in the first few days, and later decreases. The electrochemical impedance spectroscopy (EIS) shows that the structure changes in accordance with the growth of the bacteria. Therefore, high temperature microbial corrosion occurs on the matrix materials.
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Received: 13 July 2007
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Corresponding Authors:
LIU Hongfang
E-mail: Liuhf2003@yahoo.com.cn
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