The invention belongs to the technical field of
chemical engineering coatings and particularly relates to a hydrophilic nano
zinc based
composite coating used for preventing
corrosion on the surfaces of the
metal parts. The
coating comprises an emulsifier, a dispersant, an antifoaming agent, scaly metallic
powder, nano oxides, a
silane coupler, an
alcohol-type
solvent, a high-molecule organic material, a thickener and 30.0 to 60.0 percent of water serving as a disperse medium. The
coating can be coated by spraying, brushing, soaking and soaking-centrifugal
coating and other methods, and the coating can be formed by being roasted at a temperature of about 200 DEG C for 20 minutes. Neutral salt spray
corrosion resistant tests show that the neutral salt spray
corrosion resistant time is more than 800h, the
binding force is proved to be above level 4 (by an
adhesive band test). The coating has the advantages of environmental
pollution prevention, excellent metallic
corrosion resistant property, economy and practicability and convenient use; and moreover, the coating can be widely used for the
corrosion resistant treatment of the surface of
metal parts made of iron, aluminum,
copper and
magnesium alloy and the like, particularly the
corrosion resistant treatment of
metal parts with complex geometric shapes.