FIELD: metallurgy.
SUBSTANCE: coating method of metal surface or metal alloy surface involves contact of the above surface with effective amount of water treating solution or dispersion, which is free from chromate and (a) material or materials containing one or several elements chosen from elements of group IVB, (b) fluoride, (c) phosphonic acid or phosphonate, where the above phosphonic acid or phosphonate is chosen from the group containing compounds with the above formulae II, III or IV. Acid water composition or dispersion for forming of converting or passivating coating on metal surfaces is free from chromate and contains material or materials containing one or several elements chosen from elements of group IVB, (b) fluoride, (c) phosphonic acid or phosphonate, where the above phosphonic acid or phosphonate is chosen from the group containing compounds with the above formulae II, III or IV.
EFFECT: improving adhesion of coatings and corrosion protection.
19 cl, 5 tbl, 5 ex
