11832 Anodic Protection

Anodic protection differs from that of CP in that its purpose is to raise the potential of a metal into the passivation domain of the Pourbaix corrosion diagram. In this case, the metal to be protected becomes the anode of the system, which is coupled to an inert counter electrode (cathode), for example, platinum. Anodic protection systems require the formation of a stable passive film and are therefore associated with the protection of metals that readily passivate, for example, stainless steels and titanium and its alloys. The majority of applications of anodic protection involve the manufacture, storage, and transport of sulfuric acid. Other applications include the protection of mild steel in paper mill acids, ammonia, ammonium nitrate, and other fertilizers. Typically for steel in contact with 93%

TABLE 11.8 Impressed Current and Sacrificial Anode Materials

Consumable Types

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