Nickel-molybdenum-aluminum coating and preparation method thereof

The invention discloses a nickel-molybdenum-aluminum coating and a preparation method thereof. The nickel-molybdenum-aluminum coating is composed of the following elements in percentage by mass: 54.15-41.27% of nickel, 33.83-38.23% of molybdenum and 12.00-20.50% of aluminum. The preparation method comprises the following steps: adding a nickel salt, a molybdenum compound, an aluminum salt and an electroplating regulator into an ionic liquid, and dissolving by stirring to obtain a nickel salt-molybdenum compound-aluminum salt-electroplating regulator-ionic liquid electroplating solution; by using a plating part to be plated as a cathode and nickel as an anode, carrying out electroplating in the nickel salt-molybdenum compound-aluminum salt-electroplating regulator-ionic liquid electroplating solution, wherein in the electroplating process, the current density is controlled at 10-25 A/dm , the temperature is 30-60 DEG C, the rotation speed is 100-600 rpm, and the time is 10-60 minutes; and after the electroplating is finished, flushing the plating part with water, and airing, thereby obtaining a nickel-molybdenum-aluminum coating with high oxidation corrosion resistance on the plating part surface.