Cathodic protection is a practical means of controlling corrosion on the normally submerged steel srufaces of various types of waste water treatment equipment, exposed to galvanically induced corrosion, in abrasive, turbulent and aggressive electrolytes. Cathodic protection nullifies the effect of galvanic couples by raising the voltage gradient in the bulk of the water which interferes with the corrosion current flow while electro-chemically the locolized corrosion cells are controlled at the steel surfaces„

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