Coating Terms

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Since a complete homogenization is impossible in materials, there are many anodic and cathodic regions on a surface of every alloy or metal composed of single element but containing a certain amount of impurity. Hence, these neighbouring regions that have different compositions and therefore different oxidation potentials are prone to act as electrodes of a cell. If a liquid layer, even as little as a humidity layer is formed on a metal surface, this systems act as a cell. This type of cell is called as local corrosion cells.