The invention provides an aluminum-
zinc-
silicon epoxy composite
powder anticorrosive
coating and a preparation method thereof. The
coating comprises the following raw materials in parts by
mass: 50-60 parts of
epoxy resin, 20-30 parts of aluminum-
zinc-
silicon alloy powder, 3-5 parts of a nano-nucleating agent, 1-2 parts of a
silane coupling agent, 1-2 parts of a dispersant, 2-4 parts of a curing agent, 2-4 parts of a
toughening agent, 1-2 parts of a leveling agent and 10-15 parts of filler and
pigment. The preparation method comprises the following steps: fully mixing the aluminum-
zinc-
silicon alloy powder, the nano-nucleating agent, the dispersant and the filler and
pigment, adding the
silane coupling agent, stirring and ultrasonically dispersing to obtain a component I; mixing the
epoxy resin, the curing agent, the
toughening agent and the leveling agent,
drying at 80 DEG C for 20 minutes, and cooling to the normal temperature to obtain a
component II; mixing the component I with the
component II, putting a mixture into an extruder for
melt extrusion,
grinding and screening. The
coating is heat-resistant, wear-resistant and
impact-resistant, and can protect a steel structure from being corroded by various corrosive mediums for a long term.