Corrosion Behavior of 316L Stainless Steel in sulfate -reducing and iron -oxidizing bacteria solutions

Publish Year: 1389
نوع سند: مقاله کنفرانسی
زبان: English
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IOGPC17_179

تاریخ نمایه سازی: 3 آبان 1389

Abstract:

Microorganisms are able to intensely change the electrochemical conditions at the metal/solution interface by biofilm formation . Microbiologically influenced corrosion is responsible for most of the internal corrosion in oil transmission pipelines and storage tanks. corrosion and electrochemical behavior of 3 16L stainless steel was investigated in the presence of aerobic iron oxidizing bacteria IOB and anaerobic sulfate -reducig bacteria SRB isolated from cooling water systems in an oil refinery using electrochemical measurement , scanning electron microscopy SEM and energy dispersive atom Xray analysis EDAX.the combination of SRB and IOB demonstrated higher corrosion rated than SRB or IOB alone . the results show the corrosion potential , pitting potential of 316L had a distinct decrease in the presence of bacteria , in comparison with those observed in the sterile medium for the same exposure time interval. micrometer -scale corrosion pits were observed on 3 16L stainless steel surface in the presence of bacteria. the synergies between the metal surface, abiotic corrosion products , chloride anion, and bacterial cells and their metabolic products increased the corrosion damage degree of the passive film and accelerated pitting propagation.

Authors

sajjad nikkhoo

department of chemical engineering faculty of eng

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