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Corrosion of Stainless Steels AISI 304 and AISI 316 Induced by Sulfare Reducing Bacteria in Anoxic Groundwater

Picture for Corrosion of Stainless Steels AISI 304 and AISI 316 Induced by Sulfare Reducing Bacteria in Anoxic G
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Electrochemical techniques enabling real-time survey of corrosion, such as multi-electrode arrays sensors (MASS) and linear polarization resistance (LPR) were used to detect the differences in electrochemical behavior of two stainless steels.

Product Number: 51317--9359-SG
ISBN: 9359 2017 CP
Author: Pauliina Rajala
Publication Date: 2017
Industry: Science of Corrosion
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A laboratory system for studying the microbiological corrosion of decommissioning waste was designed and developed. Microbially induced corrosion in deep bedrock is important when evaluating long-term safety of disposal of radioactive waste. In oxygen-free water corrosion of metals is low. Microorganisms however are able to accelerate several types of corrosion. The groundwater at the repository depth contains up to 105 microbial cells/mL with considerable diversity.Microbiological corrosion of carbon steel in natural anoxic groundwater was studied over a one-year experimental period using electrochemical technologies and molecular biology methods. The material in this laboratory experiment was carbon steel (AISI 1005). Electrochemical methods enabling real-time survey of corrosion such as multi-electrode arrays sensors and LPR were used in combination with molecular biological methods qPCR and HTP sequencing to detect microbial biofilm formed on the carbon steel surfaces. The general corrosion rate was between 10 and 35 µm/a over the span of the experiment. Localized corrosion rates were higher than general corrosion at maximum over 900 µm/a and at average 120 µm/a. Cumulative corrosion rates were confirmed in the end of the experiment by weight loss and a corrosion rate of 10.2 µm/a was calculated. The deposits formed on the surfaces contained iron sulfur carbon and oxygen as major components. Bacterial biofilm formation on surfaces was intensive and 106/cm2 bacterial 16S copies were detected. The majority of the biofilm was formed by alpha- and betaproteobacteria and the most common archaeal belonged to Thaumarchaeota Marine Group I.The aim of this paper was to characterize microbial biofilms associated with corrosion and corrosion mechanisms. The results of this study can be used when evaluating risks associated with microbially induced corrosion of metallic materials in underground storage of low and intermediate nuclear waste.

Key words: MIC, stainless steel, groundwater, deep biosphere, SRB

A laboratory system for studying the microbiological corrosion of decommissioning waste was designed and developed. Microbially induced corrosion in deep bedrock is important when evaluating long-term safety of disposal of radioactive waste. In oxygen-free water corrosion of metals is low. Microorganisms however are able to accelerate several types of corrosion. The groundwater at the repository depth contains up to 105 microbial cells/mL with considerable diversity.Microbiological corrosion of carbon steel in natural anoxic groundwater was studied over a one-year experimental period using electrochemical technologies and molecular biology methods. The material in this laboratory experiment was carbon steel (AISI 1005). Electrochemical methods enabling real-time survey of corrosion such as multi-electrode arrays sensors and LPR were used in combination with molecular biological methods qPCR and HTP sequencing to detect microbial biofilm formed on the carbon steel surfaces. The general corrosion rate was between 10 and 35 µm/a over the span of the experiment. Localized corrosion rates were higher than general corrosion at maximum over 900 µm/a and at average 120 µm/a. Cumulative corrosion rates were confirmed in the end of the experiment by weight loss and a corrosion rate of 10.2 µm/a was calculated. The deposits formed on the surfaces contained iron sulfur carbon and oxygen as major components. Bacterial biofilm formation on surfaces was intensive and 106/cm2 bacterial 16S copies were detected. The majority of the biofilm was formed by alpha- and betaproteobacteria and the most common archaeal belonged to Thaumarchaeota Marine Group I.The aim of this paper was to characterize microbial biofilms associated with corrosion and corrosion mechanisms. The results of this study can be used when evaluating risks associated with microbially induced corrosion of metallic materials in underground storage of low and intermediate nuclear waste.

Key words: MIC, stainless steel, groundwater, deep biosphere, SRB

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04600 Microbiologically Influenced Corrosion Failure of AISI Type 304 Stainless Steel in a Wastewater Treatment System

Product Number: 51300-04600-SG
ISBN: 04600 2004 CP
Author: Kurissery R. Sreekumari, Kyozo Hirotani, and Yasushi Kikuchi, Osaka University; Katsuya Akamatsu, Ka
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The rapid and unexpected failure of AISI type 304 stainless steel in a wastewater treatment system was investigated in the laboratory by simulation studies for a period of 4 months. Slime and water samples from the failure site were screened for corrosion causing bacteria.
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01254 THE INFLUENCE OF IRON OXIDIZING BACTERIA ON CORROSION OF STAINLESS STEEL

Product Number: 51300-01254-SG
ISBN: 01254 2001 CP
Author: I.G. Chamritski, G.R. Burns, B.J. Webster and N.J. Laycock
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Picture for 08174 Unusual Corrosion Failures of Stainless Steel in Low Chloride Waters
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08174 Unusual Corrosion Failures of Stainless Steel in Low Chloride Waters

Product Number: 51300-08174-SG
ISBN: 08174 2008 CP
Author: Troels Mathiesen and Jan Elkjaer Frantsen
Publication Date: 2008
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Rare corrosion failures of stainless steel are reviewed in the paper. The cases originate from low chloride waters like potable water or fresh water in the temperature range of 15-25°C. Under such conditions full resistance of austenitic stainless steel like AISI 316 is usually expected.
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