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The term corrosion refers to degradation of metals in their chemical interaction with the environment and usually we refer to steel in this process. Metals that are in a metastable state will lose energy as they have little mechanical strength. These corrosion reactions are electrochemical in nature and a mixed anodic and cathodic reaction happens at its surface. This mixed electrode is a complete electrochemical cell on a single metal.
Metals of differing electrochemical properties come in contact a galvanic couple is formed. We can predict these galvanic effects by studying the galvanic series comprising metals and alloys in order of their potentials in the corrosive environment.
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