Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effects of blending on surface characteristics of copper corrosion products in drinking water distribution systems
The purpose of the work was to develop a theoretical model for the copper scales based on solid phases identified by surface characterization of copper coupons that were aged in pilot-scale pipe distributions systems after exposure to different finished potable water qualities. Copper scales formed over 6-months during exposure to ground, surface and saline waters were characterized by EDS, XRD and XPS. The morphology of the top layer of the surface low chloride finished water (ground water) produced a more compact top layer in the surface scale than did a low alkalinity and high chloride finished water (desalted water). Scale color and hardness were light red-brown-black/hard for high alkalinity and blue-green/soft for high SO4(2-) or Cl(-) waters. Cl(-) was present in surface or saline copper scales. The Cu/Cu2O ratio decreased with time indicating an e transfer copper corrosion mechanism. Cu2O, CuO, and Cu(OH)2 dominated the top 0.5-1 A.U. scale indicating continuous corrosion. Cu2O oxidation to CuO increased with alkalinity, and depended on time and pH. Total copper release was predicted using a Cu(OH)2 model.
Effects of blending on surface characteristics of copper corrosion products in drinking water distribution systems
The purpose of the work was to develop a theoretical model for the copper scales based on solid phases identified by surface characterization of copper coupons that were aged in pilot-scale pipe distributions systems after exposure to different finished potable water qualities. Copper scales formed over 6-months during exposure to ground, surface and saline waters were characterized by EDS, XRD and XPS. The morphology of the top layer of the surface low chloride finished water (ground water) produced a more compact top layer in the surface scale than did a low alkalinity and high chloride finished water (desalted water). Scale color and hardness were light red-brown-black/hard for high alkalinity and blue-green/soft for high SO4(2-) or Cl(-) waters. Cl(-) was present in surface or saline copper scales. The Cu/Cu2O ratio decreased with time indicating an e transfer copper corrosion mechanism. Cu2O, CuO, and Cu(OH)2 dominated the top 0.5-1 A.U. scale indicating continuous corrosion. Cu2O oxidation to CuO increased with alkalinity, and depended on time and pH. Total copper release was predicted using a Cu(OH)2 model.
Effects of blending on surface characteristics of copper corrosion products in drinking water distribution systems
Einfluss von Mischen auf die Oberflächeneigenschaften von Kupferkorrosionsprodukten in Trinkwasserverteilungssystemen
Xiao, Weizhong (Autor:in) / Hong, Seungkwan (Autor:in) / Tang, Zhijian (Autor:in) / Seal, Sudipta (Autor:in) / Taylor, James S. (Autor:in)
Corrosion Science ; 49 ; 449-468
2007
20 Seiten, 15 Bilder, 5 Tabellen, 22 Quellen
Aufsatz (Zeitschrift)
Englisch
Korrosion , Kupfer , Trinkwasser , Wasserversorgung , Pilotanlage , Mischungsverhältnis , Grundwasser , Salzwasser , Oberflächenwasser , Korrosionsprodukt , Oberflächenmorphologie , pH-Einfluss , Korrosionspotenzial , Vorhersage , Korrosionsgeschwindigkeit , theoretisches Modell , thermodynamisches Modell , Röntgenphotoelektronenspektroskopie , Röntgenbeugung , Rasterelektronenmikroskopie
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