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

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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.

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
Industry: Water/Wastewater
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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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02446 MICROBIOLOGICALLY INFLUENCED CORROSION FAILURE ANALYSIS OF 304L STAINLESS STEEL PIPING SYSTEM LEFT STAGNANT AFTER HYDROTESTING WITH CITY WATER

Product Number: 51300-02446-SG
ISBN: 02446 2002 CP
Author: Susan W. Borenstein and Philip B. Lindsay
Publication Date: 2002
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A case history is described involving microbiologically influenced corrosion (MIC) of AISI Type 304L stainless steel piping failure after being in contact with untreated stagnant, low chloride potable water for nine months. Specialized microbiological analysis techniques, including scanning electron and optical cmicroscopy, were used in the failure analysis.
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