Galvanically Coupled Metals with Similar Electrochemical Parameters

Case I Galvanically Coupled Metals with Similar Electrochemical Parameters 

When the metals are coupled, conservation of charge requires that the total oxidation current must equal the total reduction current, LIox = SIre(i. Thus the two oxidation and the two reduction curves must 

80-20 Copper-Nickel I I 90-10 Copper-Nickel I I Nickel Silver  

20 Galvanic series of various metals in flowing seawater at 2.4 to 4.0 m/sat 5 to 30 °C (volts vs. saturated calomel reference electrode). Note Dark boxes indicate active behavior of active-passive alloys. Source Ref 12 and 1 3 

This case is illustrated in Fig. 4.21. The only change from Case 1 is the position of the oxidation curve for metal A, which is now placed sufficiently positive that its equilibrium half-cell potential is above that for 

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