Abstract
The anodic behavior of copper in air-saturated NaCl aqueous solutions has been studied by both galvanostatic and potentiodynamic methods to determine the effects of the Cl− ion concentration and temperature on the dissolution of copper. The polarization curves of copper represents the two active-passive transitions. In a less noble electrode potential region, a CuCl layer was formed on copper. It was then transformed into Cu2O by the reaction with H2O and the first passivation occurred. The potential of the CuCl formation in the strong chloride solution was less noble than that in the dilute chloride solution. In an intermediate potential region, the second passivation begins when the reaction is proceeded between Cl− ion and CuCl to form Cu2O. Although CuCl is not direct cause of the passivation of copper, a stable region of Cu2O extends due to decreasing Cl− ion concentration in the electrode-solution interface by the formation of CuCl. To help interpretation of the polarization curves, a potential-pH diagram of the Cu-Cl-H2O system has shown the domains of the stable solid phase in 0.3 to 30%NaCl aqueous solutions.
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