Abstract
A review of the theories of cathodic protection has shown that a gradual improvement has taken place in the description of thefundamental principles. At the present time electrode kineticsprovide the most suitable basis for further improvement of the theory. Experimental results show that ‘jullprotection’ cannot be achieved, and so the criteria of protection have to be associated with a permitted value of corrosion rate. Criteria for cathodic protection have been determined for corrosion systems of steel-potable water saturated with air, steel-potable water saturated with hydrogen sulphide, and steel-potable water saturated with sodium chloride. In practice the form of corrosion damage is very important and this depends on theformation of corrosion cells. The operation of corrosion cells is incorporated in the improved theory of cathodic protection.
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