The ohmic overpotential appears as the simple product of a resistance and a current between the anodic and cathodic sites of a corrosion process. For many corrosion situations these sites are adjacent to each other and the ohmic drop is negligible, particularly so when the environment itself is a good electrolytic conductor, e.g. seawater. However, there are special conditions where the separation of the anodic and cathodic sites can be an important factor in the corrosion progress, e.g. galvanic corrosion, or even an integral part of protection scheme, e.g. anodic and cathodic protection.
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