The invention discloses a super-hydrophobic self-cleaning aluminum
alloy coating and a preparation method thereof, and belongs to the technical field of
metal surface treatment.The preparation method comprises the following steps that S1, an aluminum
alloy substrate is pretreated; s2, mixing TEOS, absolute ethyl
alcohol and diluted
hydrochloric acid in a
beaker, and adding PFOTES to obtain
sol; s3, mixing the SiO2
powder, the TiO2
powder, PVP (
Polyvinyl Pyrrolidone) and deionized water, and carrying out
spray granulation, so as to obtain SiO2-TiO2 composite
powder; s4, the SiO2-TiO2 composite powder, absolute ethyl
alcohol and PFOTES are mixed, and composite powder
slurry is obtained; s5, spraying the
sol on the surface of an aluminum
alloy substrate, and
drying to obtain an aluminum alloy basic
coating; s6, the composite powder
slurry is sprayed on the aluminum
alloy coating base layer, and after
drying, the aluminum
alloy composite coating is obtained; and S7, the aluminum
alloy substrate is placed in a
drying oven for heat treatment, and the super-hydrophobic self-cleaning aluminum
alloy coating is obtained. The
coating system disclosed by the invention is stable and can effectively realize self-cleaning.