The invention relates to the technical field of micro-arc oxidation
coating preparation, and particularly discloses a micro-arc oxidation heat absorption
coating preparation method, which comprises: pretreatment:
polishing the surface of an aluminum
alloy sample, soaking in an
acetone solution, washing with deionized water, and
drying; preparing an
electrolyte, adding
cerium oxide powder into the basic
silicate electrolyte, and uniformly stirring; the pretreated aluminum
alloy sample serves as an
anode, a stainless steel plate serves as a
cathode, and micro-arc oxidation is conducted; post-treatment is conducted, specifically, after micro-arc oxidation is finished, the
alloy sample is taken out of the
electrolyte, washed and dried; and hole sealing treatment is conducted, specifically, hole sealing treatment is conducted on the heat absorption
coating through a hole sealing solution containing aluminum
oxide coated
titanium dioxide nanoparticles. The micro-arc oxidation coating is endowed with heat absorption performance by adding
cerium oxide into the electrolyte, and the heat absorption performance of the coating is further improved by sealing holes of the micro-arc oxidation coating by using the
titanium dioxide nanoparticles coated with aluminum oxide.