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51312-01397-ACCELERATED CORROSION OF CARBON STEEL AND ZINC IN OXYGEN-FREE GROUNDWATER - DUE TO THE MICROBIOLOGIC

Picture for ACCELERATED CORROSION OF CARBON STEEL AND ZINC IN OXYGEN-FREE GROUNDWATER - DUE TO THE MICROBIOLOGIC
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Product Number: 51312-01397-SG
ISBN: 01397 2012 CP
Author: Leena Carpén
Publication Date: 2012
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The low and intermediate level decommissioning metal waste from Olkiluoto Nuclear Power Plant in Finland is planned to be disposed in concrete boxes to bedrock silos. This metal waste consists of carbon steel mainly. To be able to estimate the corrosion rate of carbon steel for an extensive time period a long term field exposure to measure quantitatively the corrosion rate of carbon steel in the environment simulating the final repository conditions was started in 1998 in the bedrock. Zinc coated steel is a material for rock bolts of the repository and the corrosion of zinc is investigated in the same ground water positions as the carbon steel studies. In oxygen free water the corrosion of carbon steel is very low unless the water is acid or there is microbiological activity on the surfaces. In these cases increased corrosion rates of carbon steel have been detected and in the latest measurements the corrosion of zinc had clearly increased as well. DGGE (Denaturing Gradient Gel Electrophoresis)-technique was used to compare the diversity and similarity of predominant bacterial populations on the surfaces of carbon steel and zinc specimens.
The low and intermediate level decommissioning metal waste from Olkiluoto Nuclear Power Plant in Finland is planned to be disposed in concrete boxes to bedrock silos. This metal waste consists of carbon steel mainly. To be able to estimate the corrosion rate of carbon steel for an extensive time period a long term field exposure to measure quantitatively the corrosion rate of carbon steel in the environment simulating the final repository conditions was started in 1998 in the bedrock. Zinc coated steel is a material for rock bolts of the repository and the corrosion of zinc is investigated in the same ground water positions as the carbon steel studies. In oxygen free water the corrosion of carbon steel is very low unless the water is acid or there is microbiological activity on the surfaces. In these cases increased corrosion rates of carbon steel have been detected and in the latest measurements the corrosion of zinc had clearly increased as well. DGGE (Denaturing Gradient Gel Electrophoresis)-technique was used to compare the diversity and similarity of predominant bacterial populations on the surfaces of carbon steel and zinc specimens.
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