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Copper corrosion in drinking water systems – effect of pH and phosphate-dosage / J. Dartmann in Materials and corrosion, Vol. 61 N° 3 (Mars 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 3 (Mars 2010) . - pp. 189–198 Titre : Copper corrosion in drinking water systems – effect of pH and phosphate-dosage Type de document : texte imprimé Auteurs : J. Dartmann, Auteur ; B. Sadlowsky, Auteur ; T. Dorsch, Auteur Année de publication : 2010 Article en page(s) : pp. 189–198 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Copper  release;  deacidification;  decarbonisation;  DIN  50931-1;  domestic  plumbing  installation;  mechanisms;  orthophosphate-dosage;  total  organic  carbon Résumé : Copper corrosion in residential plumbing installations can lead to an increase in copper concentration in drinking water as well as to leakages. Central water treatment steps such as pH-adjustment or dosages of phosphate-based inhibitors are measures in reducing copper corrosion. Especially phosphate in drinking water is believed to work as a corrosion inhibitor, but it is currently uncertain as to how this inhibitor works. In some cases the phosphate dosage aggravated the copper corrosion. The mechanisms are not yet clear and the influence of phosphate and pH remain a question to be answered. The results of a German Gas and Water Works Association (DVGW) research project on copper corrosion are presented as follows. The influence and the mechanisms of decarbonisation, deacidification and phosphate dosing on copper release in residential plumbing installations were studied in pipe rig experiments according to the German standard DIN 50931-1. It shows that an increased pH-value can lead to a decrease in copper content and that a phosphate dosage can lead to both higher and lower copper concentrations. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905241/abstract [article] Copper corrosion in drinking water systems – effect of pH and phosphate-dosage [texte imprimé] / J. Dartmann, Auteur ; B. Sadlowsky, Auteur ; T. Dorsch, Auteur . - 2010 . - pp. 189–198. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 3 (Mars 2010) . - pp. 189–198 Mots-clés : Copper  release;  deacidification;  decarbonisation;  DIN  50931-1;  domestic  plumbing  installation;  mechanisms;  orthophosphate-dosage;  total  organic  carbon Résumé : Copper corrosion in residential plumbing installations can lead to an increase in copper concentration in drinking water as well as to leakages. Central water treatment steps such as pH-adjustment or dosages of phosphate-based inhibitors are measures in reducing copper corrosion. Especially phosphate in drinking water is believed to work as a corrosion inhibitor, but it is currently uncertain as to how this inhibitor works. In some cases the phosphate dosage aggravated the copper corrosion. The mechanisms are not yet clear and the influence of phosphate and pH remain a question to be answered. The results of a German Gas and Water Works Association (DVGW) research project on copper corrosion are presented as follows. The influence and the mechanisms of decarbonisation, deacidification and phosphate dosing on copper release in residential plumbing installations were studied in pipe rig experiments according to the German standard DIN 50931-1. It shows that an increased pH-value can lead to a decrease in copper content and that a phosphate dosage can lead to both higher and lower copper concentrations. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905241/abstract