COMPOSITION FOR PROTECTION FROM CORROSION OF FERROUS METAL SURFACES Russian patent published in 2000 - IPC

FIELD: chemistry, petrochemistry, protection of metals from corrosion; applicable in mechanical engineering, in mechanical engineering, instrumentation engineering and other industries. SUBSTANCE: composition contains, g/l: orthophosphoric acid 85-117; cyclohexylamine or monoethanolamine 0.5-0.6; zinc oxide 3-4; N-benzylidenecyclohexylamine 0.01-0.015; detergent 9.06-10.06; and water. Detergent contains, g/l: sodium metasilicate 2.0-2.5; trisodium phosphate or sodium tripolyphosphate 7.0- 7.5; sodium tetraborate 0.05-0.055; sodium hexametaphosphate 0.01- 0.11. EFFECT: simultaneous increase of washing, degreasing, corrosion- converting, passivating and corrosion protective properties, extended assortment of acting corrosion inhibitors. 2 cl, 2 tbl, 1 ex