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02459 MANGANESE OXIDES IN PIPES OF GALVANIZED STEEL FOR POTABLE WATER - A POTENTIAL RISK OF MIC ?

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Product Number: 51300-02459-SG
ISBN: 02459 2002 CP
Author: P.Linhardt
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Depositions of manganese dioxide were identified in water pipes made of galvanized steel. Microbially deposited manganese dioxide on stainless steel is known to be cathodically active and to be a possible cause for microbially influenced corrosion of this material. In contrast, little is known about the formation of such deposits on galvanized steel and the possible consequences regarding corrosion. Electrochemical and various other investigations were carried out. The presence of manganese dioxide was confirmed but microbial activity as cause for the formation of deposits could not be verified. The latter is attributed to the insufficient sample material. The low risk of corrosion of galvanized steel by manganese dioxide is to the isolating properties of the regular corrosion products of zinc.
Depositions of manganese dioxide were identified in water pipes made of galvanized steel. Microbially deposited manganese dioxide on stainless steel is known to be cathodically active and to be a possible cause for microbially influenced corrosion of this material. In contrast, little is known about the formation of such deposits on galvanized steel and the possible consequences regarding corrosion. Electrochemical and various other investigations were carried out. The presence of manganese dioxide was confirmed but microbial activity as cause for the formation of deposits could not be verified. The latter is attributed to the insufficient sample material. The low risk of corrosion of galvanized steel by manganese dioxide is to the isolating properties of the regular corrosion products of zinc.
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Galvanized steel pipe is protected by a layer deposited by hard water, but may suffer corrosion in soft water. Presented are case studies of corrosion in galvanized water piping in a stadium, hotel, and county government building. Details of corrosion mechanism and mitigation strategies are also discussed.
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02446 MICROBIOLOGICALLY INFLUENCED CORROSION FAILURE ANALYSIS OF 304L STAINLESS STEEL PIPING SYSTEM LEFT STAGNANT AFTER HYDROTESTING WITH CITY WATER

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ISBN: 02446 2002 CP
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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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02444 MANGANESE-DEPENDENT CORROSION IN THE ELECTRIC UTILITY INDUSTRY

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