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| Microbiologically Induced Corrosion of X80 Pipeline Steel in an Acid Soil Solution: (I) Electrochemical Analysis |
| WU Tangqing1, DING Wancheng2, ZENG Dechun3, XU Changfeng3, YAN Maocheng1, XU Jin1, YU Changkun1, SUN Cheng1 |
| 1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; 2. Xinjiang Oilfield Branch, China National Petroleum Corporation, Karamay 834000, China; 3. Oil-Gas Storage and Transportation Company, Xinjiang Oilfield Branch, Karamay 834002, China |
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Abstract Electrochemical characteristics of sulphate-reducing bacteria (SRB) induced corrosion of X80 pipeline steel were studied in an acid soil solution by mean of microbiological test methods and electrochemical techniques. The results showed that there exist a period for the newly-inoculated bacteria to be acclimatized to the new environment, during which death of large quantity of bacteria did occur; the open circuit potential of the steel is always lower in the inoculated soil solution than that in the sterile environment; SRB inhibits the corrosion process of the steel in the early stage and accelerates the corrosion process in the later stage during the experiment; while the activity of SRB alters the dielectric of the metal/solution interface, which is responsible for the increase of the corrosion rate of the pipeline steel in the later stage of the experiment.
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Received: 10 April 2014
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