The invention relates to the technical field of anticorrosive paint, in particular to high-temperature-curing inorganic anticorrosive
coating for an automobile
brake disc and a preparation method thereof. The inorganic anticorrosive
coating comprises the following components in parts by
mass: 40-45 parts of inorganic resin, 3-5 parts of modified
zinc phosphate, 5-6 parts of composite ferrotitaniumpowder, 3-4 parts of a curing agent, 10-15 parts of water, 20-25 parts of talcum
powder, 0.8-2 parts of dispersing agents, 0.5-0.8 part of a defoaming agent, 0.5-1 part of a neutralizing agent and 0.5-1 part of
bentonite. According to the inorganic anticorrosive
coating, on the premise that coating thickness is 30 microns, salt spray resistance time can reach 1000 hours, and
adhesive force is good; different types of dispersing agents are selected, so the influence on the salt spray resistance of a paint film is very outstanding; a hydrophobic
ammonium salt forms a good water-resistant film,and a
sodium salt hydrophilic dispersing agent is low in relative molecular
mass, so the
water resistance and salt
fog resistance of a coating film are reduced; and the polycarboxylate
ammonium salt with a special structure and high relative molecular
mass is selected as the dispersing agent, so the
corrosion resistance of the coating is remarkably improved.