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首页> 外文期刊>Journal of Materials Engineering and Performance >Comparison of Biocorrosion due to Desulfovibrio desulfuricans and Desulfotomaculum nigrificans Bacteria
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Comparison of Biocorrosion due to Desulfovibrio desulfuricans and Desulfotomaculum nigrificans Bacteria

机译：Desulfovibrio desulfuricans和Desulfotomaculum nigrificans细菌引起的生物腐蚀比较

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摘要

One observes several species of sulfate-reducing bacteria in nature. Presence of these species in a media may cause microbial influenced corrosion (MIC) of materials differently. To investigate this aspect of MIC, corrosion tests were performed on three types of stainless steels. The tests were done in modified Baar's media inoculated separately by the two species of SRB namely Desulfovibrio desulfuricans (DD) and Desulfotomaculum nigrificans (DN). Electrochemical and immersion tests were performed to assess the extent of uniform and localized corrosion of these steels. Biofilms formed on the corroded samples were analyzed for estimating various components of its extracellular polymeric substances. Hydrogenase enzyme of these bacteria was tested to determine its nature and activity. Higher degree of corrosivity was observed in case of media inoculated with DD as compared to DN. More active nature of hydrogenase enzyme, its location in the periplasmic phase in DD and higher fraction of carbohydrate in biofilm formed due to DD have been suggested to be responsible for higher degree of corrosivity caused by them.
机译：人们观察到自然界中几种减少硫酸盐的细菌。这些物质在介质中的存在可能以不同方式引起微生物对材料的腐蚀（MIC）。为了研究MIC的这一方面，对三种类型的不锈钢进行了腐蚀测试。测试是在改良的Baar培养基中进行的，该培养基分别由两种SRB分别接种的Desulfovibrio desulfuricans（DD）和Nisulfotomaculum nigrificans（DN）接种。进行了电化学和浸没测试，以评估这些钢的均匀腐蚀和局部腐蚀的程度。分析在腐蚀的样品上形成的生物膜，以估计其细胞外聚合物的各种成分。测试了这些细菌的氢化酶以确定其性质和活性。与DN相比，DD接种的介质具有更高的腐蚀性。氢酶的活性更强，在DD的质膜相中的位置以及由DD形成的生物膜中碳水化合物的比例较高，被认为是造成它们更高程度的腐蚀性的原因。

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