1183 Anodic and Cathodic Protection

Examination of the Pourbaix diagram given in Fig. 11.2 provides information on the corrosion state for a given pH, as a function of the electrode potential. For example, Table 11.7 shows the various regions that exist at pH 7: This information provides the engineer with two options in order to reduce the rate of corrosion, namely (i) decrease the potential until the metal becomes "immune"—cathodic protection—and (ii) increase the potential until the metal becomes passive—anodic protection.

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