Abstract
The electrode potential of copper tube used in hot water distribution system in buildings rises gradually with time of exposure and then attains to a critical value of pitting potential after a long incubation period. The process of potential rise proceeds in two stages. The first stage is the formation of a cuprous oxide layer in the potential range ≦ 60 mV(SCE) and the second stage is due to the reactions of chlorite ions accumulated in the cuprous oxide layer in the potential range > 60 mV(SCE). Oxyacids and oxyanions of chlorine formed in the water, to which chlorine gas or hypochlorite was added for sterilizing process, accelerate the formation of cuprous oxide layer in the first stage, and the reaction of chlorite ions increase the electrode potential of copper tube in the second stage.
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