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| THE SINGLE EFFECT OF MICROBE ON THE CORROSION BEHAVIORS OF 45 STEEL IN SEAWATER OF TROPICAL OCEAN ENVIRONMENT |
| WU Jinyi1;2); XIAO Weilong1;2); CHAI Ke1;2); YANG Yuhui3) |
1) Ministry of Education Key Laboratory of Application Technology of Hainan Superior Resources Chemical Materials; Material and Chemical Engineering College; Hainan University; Haikou 570228
2) Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti Resources; Material and Chemical Engineering College; Hainan University; Haikou 570228
3) Agricultural College; Hainan University; Haikou 570228 |
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Cite this article:
WU Jinyi XIAO Weilong CHAI Ke YANG Yuhui. THE SINGLE EFFECT OF MICROBE ON THE CORROSION BEHAVIORS OF 45 STEEL IN SEAWATER OF TROPICAL OCEAN ENVIRONMENT. Acta Metall Sin, 2010, 46(1): 118-122.
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Abstract Biological elements have significant impact on lifetime prediction of marine carbon steel facilities. Microbe can produce pitting, crevice corrosion, selective dealloying and stress-oriented hydrogen-induce cracking, which accelerates both localized and average corrosion rates of carbon steel. The formation of microbe films can also reduce the steel corrosion rate through inhibition of oxygen diffusion and depletion of oxygen in the electrolyte and metal/solution interface. A comparing study of the corrosion behaviors of 45 steel in natural seawater and in sterile seawater in tropic condition shows that in most of immerging periods, the bacterial activity at the interface accelerates the average corrosion rate of the steel. However, when the corrosion time is 28 d, the biofilms inhibit the corrosion of 45 steel. The species and contents of microbe significantly influence the corrosion behavior of the steel. The microbe in the corrosion product mainly consists of Pseudomonas, Vibrio, Crenothrixandleptothrix, Thiobacillus, and Sulfate-reducing bacteria. The content of aerobe does not change with increasing the immerging time, but the content of anaerobe increases with increasing immerging time. The regular change of the content of microbe with the immerging time leads to the different microbe corrosion mechanisms for 45 steel.
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Received: 27 February 2009
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| Fund: Supported by National Natural Science Foundation of China (No.50761004), Natural Science Foundation of Hainan Province (Nos.807011 and 80630), Project of the Education Department of Hainan Province (No.{\footnotesize\it Hj200706) and Foundation of Hainan University (Nos.Kyjj0536 and hd09xm77) |
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