FIELD: chemistry.
SUBSTANCE: invention relates to coating composite powdered materials which can be used for spray coating. Powder with grain size smaller than 20 mcm is treated in a coating solution which contains a precipitated metal salt, a complexing agent and a reducing agent. Before treatment, the powder is soaked with isopropyl alcohol, mixed, added to the coating solution and treated while mixing, first at 25-30°C for 15-20 minutes and then at 55-60°C to provide complete reduction of ions of the precipitated metal from the coating solution. The isopropyl alcohol is used in amount of 50 ml/l.
EFFECT: high quality of coating.
3 cl, 1 tbl, 1 ex
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