1. It is shown that cathodic polarization of a spent zinc paint coating effects a restoration of its protective potential. The displacement of the potentials of the spent zinc coating in the negative direction depends on the chemical composition and the amount of insoluble zinc corrosion products, and also on the amount of zinc formed by the electrolysis of the water-soluble corrosion products of zinc (ZnCl2, ZnS04).n2. The use of cathodic protection simultaneously with protective coatings of zinc paint for the preservation of steel structures, marine petroleum equipment and ships makes possible a reduced expenditure of electric current and an increase in the period of effectiveness of the paint coatings.
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