FIELD: metallurgy.
SUBSTANCE: claimed composition contains the rare-earth metal, zirconium compounds, electropositive metal and not over 1 ppm of unbound fluoride in terms of elementary fluoride that ensures the rare-earth metal solubility in the composition. Note here that said composition features pH of 2.9-4.4 while, in contact with the metal substrate, reacts with the substrate surface to change chemically the metal substrate surface and to be bonded with said surface so that protective ply is formed.
EFFECT: formation of protective ply on metal substrate before coat application.
16 cl, 3 tbl, 2 ex
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