Effect of lronOxidizing Bacteria on Pitting of Stainless Steel

l.G. Chamritski; G.R. Bums; B.J. Webster

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Effect of lronOxidizing Bacteria on Pitting of Stainless Steel

机译：Effect of lronOxidizing Bacteria on Pitting of Stainless Steel

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Microbiologically influenced corrosion (MIC) of stainless steel (SS) can be caused by the action of metal-oxidizing bacteria (MOB) in natural, relatively low-chloride waters. This type of corrosion Is frequently associated with ennoblement of the open-circuit potentiell and involves iron-oxidizing bacteria (IOB) and manganese-oxidizing bacteria (MnOB). This work focuses of the role of IOB and associated inorganic water chemistry processes that may cause corrosion of SS. Laboratory and field studies haue been conducted to investigate the influence of deposited ferric oxide (or oxyhydroxide) on the corrosion of UNS S30403. Samples exposed to a natural spring water reached open-circuit potentials of 250 mV vs saturated calomel electrode (SCE) and were covered by a biqfllm containing a mixture of geothite (alpha-FeOOH), lepidocrocite (gamma-FeOOH), and magnetite (Fe_3O_4) or maghemite (gamma-Fe_2O_3), together with low levels of manganese-based deposits. In the laboratory, an iron-based film was formed on some samples by oxidation offerrous sulfate (FeSO_4 with calcium hypochlorite (CaClO_2), giving a surfacefilm with a composition similar to that produced by microbial activity. These samples did not show ennoblement, but they did show lower pitting potentials than were measuredfor control samples. The results of this work are consistent with the idea that MIC of SS in potable water involves manganess based deposits callsing ennoblement(W.H.Dickinson,F. CaccavoJr., Z. Lewandowski, Corros. Sei. 38 1996, p. 1,407), combined with iron-based deposits simultaneously causing a decrease in the pitting potential (M. Suleiman, I. Ragault, R. Newman, Corros. Sei. 36 1994, p. 479).

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《Corrosion: The Journal of Science and Engineering》 |2004年第7期|658-669|共12页
作者
l.G. Chamritski; G.R. Bums; B.J. Webster;
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作者单位

Victoria University of Wellington, School of Chemical and Physical Sciencens, PO Box 31-569, Lower Hutt, New Zealand.;

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原文格式 PDF
正文语种英语
中图分类金属腐蚀与保护、金属表面处理;
关键词
chlorination; corrosion; iron-based film; metal-oxidizing bacteria; microbiologically influenced corrosion; Roman spectroscopy; stainless steel;

Effect of lronOxidizing Bacteria on Pitting of Stainless Steel

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