Relation between Metal Corrosion and Electrical Polarization
The increasing use of metals as implant materials in orthopaedic surgery has stimulated a considerable amount of interest among researchers and orthopaedic surgeons enabling the study of corrosion, wear, hypersensitivity, toxcity and carcinogenicity (Furst and Haro, 1960; Mears, 1979; Woodman, 1980). Partly, the corrosion Phenomena is due to the metal implant ionization in living tissue (Ferguson et al, 1960; Lautenschlager et al, 1974). Corrosion is a complex electrochemical deterioration of metals (Clark and Hickman, 1953). Futhermore, corrosion is referred to as a combination of oxidation and reduction of reactions at the implant-tissue interface. The basic reactions in corrosion are the removal of positive metal ions from their positions in the metal crystal lattice. This is called an anodic reaction. Similarly, the freed electrons, as a result of removed cations, also react to oxygen and hydrogren molecules in tissues to form hydroxyle. This is defined as cathodic reactions at the metal-tissue interface (Mears, 1979).
KeywordsAnodic Polarization Electrical Polarization Cathodic Reaction Metal Corrosion Corrosion Phenomenon
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