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| INFLUENCE OF VIBRIO ON CORROSION BEHAVIORS AND MECHANICAL PROPERTIES OF 45 STEEL IN SEAWATER |
| WU Jinyi, LUO Qi, XIAO Weilong, CHAI Ke, Cao Yang |
| Key Laboratory of Ministry of Education for Application Technology of Chemical Materials in Hainan Superior Resources, Material and Chemical Engineering College, Hainan University, Haikou 570228 |
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Abstract It has been found that microbiologically influenced corrosion (MIC) plays a significant role in corrosion process of steels exposed in marine environment. Microbe can produce pitting, crevice corrosion, selective dealloying and stress-oriented hydrogen-induced cracking, which accelerates both localized and average corrosion rates of carbon steel. Wu et al. reported that when the corrosion time is 365 d, the average corrosion depth of 25 steel in natural seawater is 2.6 times higher than that in sterile seawater, and localized attack is also observed on the specimens immersed in natural seawater. Preliminary work also shows that Vibrio is the key component of microbe in the corrosion product. The research on the single effect of Vibrio on the corrosion behaviors and mechanical properties of metal is insufficient up to now. In this work, Vibrio is cultured in seawater. 45 steel coupons are immersed in three different mediums in tropic condition: natural seawater, sterile seawater and Vibrio-containing seawater. The results show that instead of culturing in culture medium, Vibrio can be cultured in seawater to a high concentration, which avoid the corrosion inhibitor behavior from culture medium and near natural corrosion condition. The activity of Vibrio at the interface accelerates the average corrosion rate for 45 steel. Coupons immersed in natural seawater show faster average corrosion rate than in Vibrio-containing seawater due to microbial synergy. Vibrio is acid-producing bacteria which can decrease the local pH value and cause significant local corrosion. Local corrosion in the surface of metal would lead to stress concentration on the local corrosion site and cut down the tensile strength of material.
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Received: 16 September 2011
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Corresponding Authors:
WU Jinyi
E-mail: wujinyi1976@yahoo.com.cn
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