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| AN ELECTROCHEMICAL EVALUATION OF STEEL CORROSION INDUCED BY TWO SULPHER-OXIDIZING BACTERIA |
| Zhang Ying;Dai Mingan(Qingdao Institute of Marine Corrosion)Whang Qiu(Qingdao Marine University) |
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Abstract Electrochemical techniques along with scanning electron microscopy(SEM) andX-ray diffraction analysis(XRD) were employed for investigating the effect of Thiobacillus thioparus(T.P.) and Thiobacillus ferrooxidallces(T.f.) bacteria on the mechanism of Microbiologically Induced Corrosion of Cr-Ni-Mo-V steel and 316L SS. Experimental results showed that both bacteria could attach on the surface of these steels and induce localized changes of the costituents, pH and oxygen levels of the electrolyte. These changes can lead to variations in the types and rates of electrochemical reactions of the steels. T.P. could excrete sulfuric acid and form a slime layer. T.f. could oriize Fe2+ into Fe3+ and form tubercles. In the cultiVation of T.P., the pitting resistance of 316L SS was found to be lower, its mas. and Ecorr became hlgher, an active peak was observed and its Passive range was reduced. However, T.f. has no obvious effect on 316L SS.
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Received: 25 April 1994
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| 1LittleBJ,WapnerPA．CORROSION//86,paperno．1222许怀恕,纪伟尚等．青岛海洋大学学报,1989,19(1):1043薛延耀等．海洋微生物学,北京:科学出版社,1959．1944郑士民,颜望明．自养微生物,北京:科学出版社,19835GB4334．9-84不锈钢点蚀电位测量方法6NewmanRC,AlmanHS．Corrosion,1982,38(5):2617GarnerA．Corrosion,1985,41(10):5878DexterSC;GaoGY．Corrosion,1988,44(6):717 |
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