Page 27 - Challenges in Corrosion Costs Causes Consequences and Control(2015)

GALVANIC CORROSION 5

i o, c
E eq. c
i′ o, c
E eq. c

E

i o, a

i′ corr i corr
Log i
Figure 1.3 Evans diagram for corrosion of zinc as a function of pH. (Reproduced by
permission, Elsevier Ltd., (2).)

i′ o, c i′′ o, c i′′′ o, c
E eq. c
A B C

E

i o, a

i′ corr i′′ corr i′′′ corr
Log i
Figure 1.4 Evans diagram for corrosion of zinc alloys. (Reproduced by permission, Elsevier
Ltd., (2).)