Electrolyte as well as application and method for preparing micro-arc oxidation film on zirconium alloy cladding of nuclear fuel rod by an electrolyte

The invention relates to an electrolyte for preparing a micro-arc oxidation film on a surface of zirconium or a zirconium alloy, a method for performing micro-arc oxidation on the surface of the zirconium or the zirconium alloy by using the electrolyte, as well as application of the electrolyte in preparing a micro-arc oxidation film on the surface of the zirconium alloy cladding of a nuclear fuel rod. The electrolyte is a mixed aqueous solution which is mixed with 5g/L-15g/L of sodium carbonate, 2g/L-12g/L of lithium hydroxide and 30ml/L-60ml/L of glycerin. The using environment for the cladding of the nuclear fuel rod in a reactor is fully taken into account, and the electrolyte for micro-arc oxidation of the zirconium alloy and an oxidation technology are selected reasonably, so that after a cladding material of the zirconium alloy is treated by micro-arc oxidation, the resistance to high temperature, high pressure and water corrosion is increased greatly.