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Study of corrosion material accumulated on the inner wall of steel water pipe
The purpose of this study is to identify the chemical composition of corrosion material accumulated on the inner wall of a mild steel 'water pipe', and the iron species present. It will be shown that the material accumulated is predominantly derived from in situ iron corrosion processes rather than from the sedimentation of particles introduced into the water distribution system. The dominant iron species found was Fe(III) - >90%, with concentrations of Fe(II) and Fe (free and amorphous Fe) being <10%. The results also showed that the accumulated material was composed predominantly of goethite (alpha-FeOOH - 75.6%), with magnetite (Fe3O4 - 21.5%) and lepidocrocite (gamma-FeOOH - 2.9%) also being present. It is assumed that FeOOH is derived from amorphous Fe(OH)3 when it dehydrates. The mechanism for forming corrosion material is metallic Fe firstly oxidized to Fe(2+) by dissolved oxygen in the water, then, released into water, and further oxidized to Fe(3+), forming solid (Fe(OH)3, which can accumulate on the inner wall of the steel and iron pipe. The Fe(OH)3 gradually dehydrates and changes slowly into another Fe(III) oxide - FeOOH. The majority of the iron corrosion material should form Fe(OH)3 in an amorphous state which in turn becomes a mixture of Fe(OH)3 and FeOOH. Further research about the relationship between human health and use of drinking water passed through steel or iron pipes containing corrosion material is required.
Study of corrosion material accumulated on the inner wall of steel water pipe
The purpose of this study is to identify the chemical composition of corrosion material accumulated on the inner wall of a mild steel 'water pipe', and the iron species present. It will be shown that the material accumulated is predominantly derived from in situ iron corrosion processes rather than from the sedimentation of particles introduced into the water distribution system. The dominant iron species found was Fe(III) - >90%, with concentrations of Fe(II) and Fe (free and amorphous Fe) being <10%. The results also showed that the accumulated material was composed predominantly of goethite (alpha-FeOOH - 75.6%), with magnetite (Fe3O4 - 21.5%) and lepidocrocite (gamma-FeOOH - 2.9%) also being present. It is assumed that FeOOH is derived from amorphous Fe(OH)3 when it dehydrates. The mechanism for forming corrosion material is metallic Fe firstly oxidized to Fe(2+) by dissolved oxygen in the water, then, released into water, and further oxidized to Fe(3+), forming solid (Fe(OH)3, which can accumulate on the inner wall of the steel and iron pipe. The Fe(OH)3 gradually dehydrates and changes slowly into another Fe(III) oxide - FeOOH. The majority of the iron corrosion material should form Fe(OH)3 in an amorphous state which in turn becomes a mixture of Fe(OH)3 and FeOOH. Further research about the relationship between human health and use of drinking water passed through steel or iron pipes containing corrosion material is required.
Study of corrosion material accumulated on the inner wall of steel water pipe
Untersuchung der Anhäufung von Korrosionsprodukten an der Innenwand von Stahl-Wasserleitungen
Lin, J. (author) / Ellaway, M. (author) / Adrien, R. (author)
Corrosion Science ; 43 ; 2065-2081
2001
17 Seiten, 5 Bilder, 6 Tabellen, 34 Quellen
Article (Journal)
English
Wasserleitung , Trinkwasser , Rohrstahl , Korrosionsprodukt , Anreicherungsschicht , Phasenzusammensetzung , Eisenoxid , Eisenhydroxid , Goethit , Magnetit , Korrosionsmechanismus , anodische Reaktion , kathodische Reaktion , Gesundheitsgefährdung , energiedispersive Spektrometrie , Röntgenbeugung , kohlenstoffarmer Stahl
Study of corrosion material accumulated on the inner wall of steel water pipe
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