Water Supply Vol 2 No 4 pp 119–127 © IWA Publishing 2002
Influence of corrosion scales on copper corrosion
by-product release
T. Merkel*, H.-J. Groß**, G. Beuchle***, W. Werner****, E. Detscher***** and S.H. Eberle******
*DVGW-Technologiezentrum Wasser Karlsruhe, Karlsruher Str. 84, D-76139 Karlsruhe, Germany (E-mail: Merkel@TZW.de)
**DVGW-Technologiezentrum Wasser Karlsruhe, Karlsruher Str. 84, D-76139 Karlsruhe, Germany
***Research Center Karlsruhe, Institute of Technical Chemistry - Water and Geotechnology, Postfach 3640, D-76021 Karlsruhe, Germany
****DVGW-Technologiezentrum Wasser Karlsruhe, Karlsruher Str. 84, D-76139 Karlsruhe, Germany
*****DVGW-Technologiezentrum Wasser Karlsruhe, Karlsruher Str. 84, D-76139 Karlsruhe, Germany
******DVGW-Technologiezentrum Wasser Karlsruhe, Karlsruher Str. 84, D-76139 Karlsruhe, Germany
ABSTRACT
Based on a literature study and experiments the copper corrosion mechanism is subdivided into three processes: copper oxidation, deposition of corrosion by-products, and establishment of a solubility equilibrium. This approach is applied to explain the results of a study on the influence of temperature on copper dissolution and deposition of copper corrosion by-products. Changes in water quality are monitored by regular sampling, qualitative and quantitative changes of surface layers are studied using computer-supported light microscopy and scanning electron microscopy.
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