Analysis of Copper Pitting Failure in Drinking Water Distribution System
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Electrochemical tests, as well as surface and chemical analysis were used to investigate the cause of pitting failure of copper tubing in a drinking water distribution system. The results show that localized pitting was the cause of failure and copper corrosion problems were observed under a green deposit. The pitting corrosion was associated with the Cl− and SO4 2− ions introduced by the water softening treatment. These ions promoted the corrosion and the influence of Cl− ion was much greater than that of the SO4 2− ion.
KeywordsPitting Corrosion failure analysis Current testing Copper tube Water distribution system Electrochemical test