A study of the microbiological-corrosion products of steel and cast iron pipes in fresh water
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Biological corrosion is one of the most common corrosive processes found in steel, cast iron and other metals placed in soil, sea water and fresh water. We have studied this type of corrosion development process in steel and cast iron pipes. This corrosion process shows tubercular morphology on the inside surface of pipes. Resulting corrosion products have been examined by: chemical analysis, scanning electron microscopy (SEM), X-ray diffraction (XRD) and Mössbauer spectroscopy. In all the samples the following iron compounds were found: α-FeOOH (Goethite), γ-FeOOH (Lepidocrocite), non-stoichiometric Fe3O4 and colloidal hydrate oxide Fe(OH)3 · 0.9H2O. Small quantities of α-FeOOH and γ-FeOOH compounds were present as small size grain particles (10–20 nm). These particles may be considered responsible for worsening the organoleptic properties of water.
KeywordsScanning Electron Microscopy Hydrate Fe3O4 Fresh Water Cast Iron
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