REFINEMENT OF METHODS OF MEASURING THE MICROBIOLOGICAL AND CORROSIVE ACTIVITY OF SULFATO-REDUCING BACTERIA
Two groups of methods have been followed in this study. They are based on the fact that metal corrosion, in particular of iron, is an electrochemical phenomenon even if biological processes can intervene in a massive way. Corrosion is measured using electrochemical techniques in media with and without sulfato-reducing bacteria in order to study the influence of these bacteria. The first group of methods consisted of classical measurements of the following parameters: corrosion potential; polarization resistance; slope of the anodic and cathodic Tafel lines; velocity of the general corrosion; pitting index. The second group of methods is more original, and concerns the potential measurements in "biological electrical batteries" consisting of two half elements (electrodes immerged in an electrolyte) that are identical at the onset of the experiment except for the presence of sulfate reducing bacteria in one cell whereas the other is sterile. The influence of temperature and bacteria population on the corrosion activity has been studied. The temperatures varied between 25 and 45 degrees C and the bacteria concentration between 0 and 20,000 bacteria/ml. Bacterial corrosion can be detected a few days after the start of an experiment. This fast response indicates the potential of this method relative to classical microbiological methods.
Bibliographic Reference: EUR 9701 FR (1985) MF, 45 P., BFR 150, BLOW-UP COPY BFR 225, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989123119100 / Last updated on: 1987-01-01
Available languages: fr