Coating Terms

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Electrochemical circuit that has two different metals as its electrodes and that more active electrode naturally behaves as the anode, experiencing corrosion.
Laboratory tests that aim to determine the corrosion resistances of coated or uncoated materials in a much shorter time than actual exposure periods in their usual service lives, by subjecting the materials to severely corrosive conditions.
Wearing away of metals due to electrochemical reactions is known as metallic corrosion. Oxidizing of metals through an electrochemical process leads to the formation of metal oxides or other metal salts. Of these corrosion products, metal oxides are commonly named ”rust”.
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.