METAL SURFACE TREATMENT COMPOSITION Russian patent published in 2007 - IPC C23C22/13 

FIELD: metal surface chemical treatment.

SUBSTANCE: invention relates to compositions for chemical treatment of metal surfaces preventing corrosion of metal and designed to prepare metal surface for deposition of lacquer coating without preliminary removal of corrosion products. Water-based composition contains 45-60% orthophosphoric acid, 2.0-3.5% zinc nitrate, 2.5-4.0% potassium ferrocyanide, and 0.1-0.3% nonionic fluorocarbon surfactant of general formula R_FCONH(C₂H₄O)_nH, wherein R_F represents C₆F₁₃-, C₈F₁₇-, or C₂F₅OC₃F₆OC₂F₄-, and n = 10-15.

EFFECT: prolonged service time of metal articles, prevented further corrosion of metal, and increased storage time of composition.

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