Effect of aluminium solids and chlorine on cold water pitting of copper |
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Authors: | Jason C. Rushing Marc Edwards |
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Affiliation: | a Parsons Corporation, 10521 Rosehaven Street, Fairfax, VA 22030, USA;b Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, 418 Durham Hall, Blacksburg, VA 24061, USA |
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Abstract: | 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. |
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Keywords: | Copper Pitting corrosion Chlorine Aluminium |
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