STEEL UNDERCOAT Russian patent published in 2006 - IPC B05D7/14 C09D1/02 C09D5/10 

FIELD: processes adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials, namely for steel covering.

SUBSTANCE: method involves applying undercoat including binding agent on steel substrate; drying thereof up to termination of user's finger sticking to the coated steel surface; immersing the coated surface in water or exposing thereof to atmospheric air having humidity of at least 50%. The binding agent is aqueous silicon dioxide sol having SiO₂/M₂O mol ratio of at least 25:1, wherein M is summary alkali metal and ammonium ions. In accordance with the second embodiment the coated steel substrate before substrate submersion in water or exposing to humidified air is treated with solution, which increases coating film strength, over at least 80% of steel substrate area.

EFFECT: increased hardness, cohesion, wear resistance, as well as increased corrosion resistance, elimination of air bladders forming.

16 cl, 8 tbl, 15 ex