Isopotential variations

Isopotential lines may vary with electrode position for the secondary and tertiary current and potential distributions, where interfacial polarization of various types is considered. The variation of local true potential across the electrochemical interface with electrode position is of great interest in galvanic corrosion, cathodic protection, etc., since this true potential drives electrochemical reactions. 

Figure 2.4 Variations of concentrations of Ag(l) cyanide complexes in a series of isopotential solutions. Total concentrations of Ag(l)and cyanide are shown by dotted lines.

The reason for this variation may be understood from Figure 6.14 which shows calculated isopotential lines for a 10 M solution and a 10 M solution respectively. 

---