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Extra resources for Encyclopedia of Electrochemistry. Corrosion and Oxide Films

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3 Kinetics of Electrolytic Corrosion Reactions will depend upon the ratio of the cathodic area to the anodic area. The galvanic interaction of a metal-coated metal structure that is scratched down to the substrate metal will depend upon the relative nobility of the two metals. For the case of a steel structure plated with a layer of Ni, which is more noble than the steel, the cathode-toanode ratio would be large and corrosion of the steel in the scratch would be greatly accelerated. In the case of galvanized steel sheet, the Zn coating is anodic so that the cathode-to-anode ratio is small.

Eventually, one reaches a value of cB,s = 0 and this is the maximum possible rate since the surface concentration cannot become negative. The current density corresponding to this condition is the limiting current density ilim . ilim = −nF DB cB,b δ (41) Dividing Eq. (38) by Eq. (41) yields Eq. (42) cB,s i = 1− ilim cB,b (42) which can be rearranged to give Eq. (43). cB,s i =1− cB,b ilim (43) Substituting into Eq. (37): i = i0 1 − i ilim −(1 − α)nF (E − E rev ) RT (44) This can be rearranged to yield Eq.

2. The arrows symbolize the reaction rate.

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