Journal
CORROSION SCIENCE
Volume 46, Issue 12, Pages 3069-3088Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2004.05.021
Keywords
copper; pitting corrosion; chlorine; aluminium
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Both aluminium solids and chlorine are often present in potable water systems, but their effect on copper corrosion and pitting is not well understood. Circumstantial evidence from one system with copper pitting problems suggested that high chlorine residuals and aluminium solids might be contributing factors. To test this hypothesis, a series of experiments were conducted to examine their effect on copper corrosion under stagnant and flow conditions. Although chlorine alone impacted copper corrosion, a synergistic reaction was discovered between chlorine and aluminium solids when exposed to copper. Evidence for this effect was seen in increased chlorine decay rates, increased non-uniform copper corrosion, and rising corrosion potentials during exposure. It is likely this reaction is involved in copper pit initiation. (C) 2004 Elsevier Ltd. All rights reserved.
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