The metallic state for the majority of structural metals under atmospheric conditions (presence of moisture and atmospheric oxygen) and in a number of liquid media (natural waters and solutions of salts, acids, and alkalis) is thermodynamically unstable. The tendency of metals to pass from the metallic state into a new state is quite different for different metals and, in general, is characterized by the reduction of free energy corresponding to the corrosion reaction taking place under specific conditions. An approximate evaluation of the degree of thermodynamic instability for various metals in electrolyte solutions can be made from the standard electrode potential of the metal .
KeywordsCorrosion Process Thermodynamic Stability Corrosive Medium Anodic Process Cathodic Protection
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