FIELD: chemical industry. SUBSTANCE: composition makes it possible to maintain stable properties of coating having the structure of phosphophilite, high corrosion resistance and minimum amounts of chemicals used. Composition for preparing protective phosphate coating comprises, wt.-%: zinc oxide, 2.4-2.75; nickel nitrate, 5.7-11.0; manganese nitrate rexahydrate, 6.3-13.0; orthophosphoric acid, 30.0-34.5; sodium hydroxide, 5.3-6.5; and the water balance. Corrective formulation comprises, wt.-%: zinc oxide, 4.6-7.10; nickel nitrate hexahydrate, 4.6-7.85; manganese nitrate hydrate, 6.7-15.7; phosphoric acid, 30.1-35.5; sodium hydroxide, 0.6-6.1; and the water balance. EFFECT: improved properties of phosphate coating. 3 cl, 1 tbl
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