Environmental Engineering Reference
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Figure 3.2
Effect of cathode-anode area ratio on galvanic corrosion of zinc-platinum
couples.
In the foregoing discussion the effect of coupling a corroding metal with an
inert metal has been discussed. When both metals are corroding in a particular
electrolyte, the effect of coupling on their corrosion behavior is described in Fig.
3.3. The metal M is nobler than the metal N. M corroding singularly in the corro-
sive medium shows a corrosion rate corresponding to i corr(M) , whereas the corrosion
rate for the metal N is i corr(N) . As M and N are coupled, E couple shifts to the nobler
Figure 3.3
Corrosion behavior of two corroding metals in a galvanic couple.
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