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Encyclopedia of Electrochemistry. Corrosion and Oxide Films by unknown author

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If not, the corrosion rate will be negligibly small, as is often the case in nonaerated, distilled, or deionized water. Electrons can easily be transported in metals owing to their conductivity. Therefore, the electrical circuit is closed in a conductive electrolyte and corrosion reactions can take place at the metal electrode surface. The dissolution and reduction reactions are evenly distributed during uniform corrosion as demonstrated in Fig. 2. The arrows symbolize the reaction rate.

13 Prediction of influence of area ratio on galvanic corrosion using measured polarization curves. M and N drawn in terms of current. The curve for M is offset along the current axis showing the situation for M electrodes with three different areas. As the area of M increases, the couple potential (ignoring effects of ohmic potential drops) approaches the uncoupled corrosion potential for M in the given solution, which is the highest possible couple potential. Similarly, the lowest possible couple potential, found when the N : M area ratio is very low, is the uncoupled corrosion potential for N in the environment.

Rearranging Eq. 3RP (48) This is the Stern–Geary equation, which shows that the corrosion rate can be determined by a small polarization from the corrosion potential, unlike Tafel extrapolation, which requires large potential changes from the corrosion potential. The Tafel slopes ba and bc must be known to get icorr from RP . In order to get the Tafel slopes, it is necessary to apply large potential changes from Ecorr , which defeats the purpose of the linear polarization technique. However, it is possible to make assumptions about the Tafel slopes with little error.

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