It is important to recognize some of the limitations of the Pourbaix diagrams. įigure 2.22 Pourbaix diagram for the copper-water system at 25° C. The oxide of copper, Cu+ and Cu " " are only. Copper is not passive in acid electrolytes. Copper (E° = 0.337 V) is more noble than iron ( p = -0.444V), however, it is more stable in water (SHE) than iron. Ī Pourbaix diagram for copper/water system is shown in Fig. įig- 7.36 Pourbaix diagram for the system copper-water. This greater nobility results in copper being thermodynamically stable in water that is, line 14 (-6) representing aCu2+ = 10-6 lies above line a. The more positive standard electrode potential of copper (+337 mV (SHE)) as compared to iron (-440 mV (SHE)) is evident. The Pourbaix diagram for the copper/water system is shown in Fig. FIGURE 7.1 Pourbaix diagram of copper-water system (from Ref.
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