115 Forms Of Corrosion

Corrosion may result from many different sets of circumstances. As previously mentioned, aqueous corrosion is electrochemical in nature and therefore requires

electron transfer between anodic and cathodic sites. In the case where the anodic and cathodic processes are distributed homogeneously over the metal surface (see Fig. 11.6a), uniform corrosion is said to occur. Where oxidation and reduction reactions occur at fixed, spatially separated sites, localized corrosion results (Fig. 11.6b).

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