FIELD: metallurgy.
SUBSTANCE: water composition contains 5-50 g/l of phosphate ions, 0.3-3 g/l of zinc (II) ions, 1-200 ppm chosen from water-soluble zirconium and titanium compounds, in terms of elementary zirconium and titanium; at that, one or several water-soluble compounds of zirconium and free fluoride is contained in quantity of 1-400 ppm, which is measured with an electrode sensitive to fluoride. In corrosion-protection conversion treatment method of metal surfaces, which, in addition to steel and/or zinc-plated steel and/or alloyed zinc-plated steel surfaces, also contain aluminium surfaces, cleaned and degreased metal surfaces are brought into contact with water composition.
EFFECT: invention allows obtaining homogeneous converted layer on the surfaces which, in addition to steel or zinc-plated steel or alloyed zinc-plated steel surfaces, also contain aluminium surfaces.
11 cl, 10 tbl
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