Most corrosion problems involve forms of cathode/anode interactions. Through many years of research the importance of this cathode/anode interaction to corrosion problems, such as pitting corrosion, crevice corrosion, and galvanic corrosion is well recognized. However, due to the lack of an analytical tool, this cathode/anode interaction has not been quantitatively described for complex geometries. A classical example is the galvanic corrosion phenomena where a large cathode surface is considered to be undesirable, however, no one has ever defined a large surface in quantitative terms.

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