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

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.

Product Number: 51300-04600-SG
ISBN: 04600 2004 CP
Author: Kurissery R. Sreekumari, Kyozo Hirotani, and Yasushi Kikuchi, Osaka University; Katsuya Akamatsu, Ka
Publication Date: 2004
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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. Pseudomonas sp. and Bacillus sp. were the most common aerobic bacteria isolated whilst sulfate reducing bacteria (SRB) were the major anaerobic bacteria. Compared to sterile controls, metal coupons exposed to Pseudomonas sp and Bacillus sp. showed initiation of severe pitting corrosion suggesting the possibility of MIC. As the appearance of pits was different in both the tested strains, it was thought that the mechanisms of corrosion are different.

KEYWORDS: Bacteria, Biofilms, pitting, Microbiologically Influenced Corrosion, Stainless steel

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. Pseudomonas sp. and Bacillus sp. were the most common aerobic bacteria isolated whilst sulfate reducing bacteria (SRB) were the major anaerobic bacteria. Compared to sterile controls, metal coupons exposed to Pseudomonas sp and Bacillus sp. showed initiation of severe pitting corrosion suggesting the possibility of MIC. As the appearance of pits was different in both the tested strains, it was thought that the mechanisms of corrosion are different.

KEYWORDS: Bacteria, Biofilms, pitting, Microbiologically Influenced Corrosion, Stainless steel

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