Transcription of CORROSION BASICS
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CORROSION BASICS
CORROSION BASICS (from Swain (1996) and Schultz (1997)) What is CORROSION ? Webster s Dictionary - corrode (v.) To eat away or be eaten away gradually, especially by chemical action. NACE CORROSION BASICS - CORROSION may be defined as the deterioration of a material (usually a metal) because of a reaction with the environment. Why do metals corrode? Most metals are found in nature as ores. The manufacturing process of converting these ores into metals involves the input of energy. During the CORROSION reaction the energy added in manufacturing is released, and the metal is returned to its oxide state. ProductsCorrosion Metal Ore Metalelectrons) (strip oxidation electrons) (add reduction In the marine environment, the CORROSION process generally takes place in aqueous solutions and is therefore electrochemical in nature.
Concentrations of anodic and cathodic reactants will alter the balance between the oxidation and reduction reactions. The Nernst equation allows us to calculate metal potentials under differing metal ion or oxidation/reduction conditions. The Nernst equation may be stated as follows: [ ] [ ] [ ]
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