▎ 摘　　要

NOVELTY - Preparation of nickel-cobalt-based nanocomposite coating for sintering neodymium-iron-boron, involves (S1) before electroplating the sintered neodymium-iron-boron, pre-treating the surface of the sintered neodymium-iron-boron, (S2) preparing nickel-cobalt alloy electroplating solution and composite nanomaterial additive solution, (S3) mixing prepared nickel-cobalt alloy electroplating solution and the composite nano-material additive solution according to a certain volume ratio to form a composite nickel-cobalt-based nano-electroplating solution, (S4) using the composite nickel-cobalt-based nano-electroplating solution to electroplate the surface of sintered neodymium-iron-boron, and controlling the electroplating time within 60-120 minutes, and (S5) after cleaning the electroplating sintered neodymium-iron-boron with deionized water, surface conditioning and drying, and forming a nickel-cobalt-based nanocomposite coating on the surface of the sintered neodymium-iron-boron. USE - Preparation of nickel-cobalt-based nanocomposite coating for sintering neodymium-iron-boron, and used for single-layer anti-corrosion coating or intermediate layer of multi-layer anti-corrosion coating (all claimed). ADVANTAGE - The composite nickel-cobalt-based nano-electroplating solution has simple preparation, stable process conditions, low pollution, and capable of industrial production. The nickel-cobalt-based nanocomposite coating has a good bonding force with the sintered neodymium-iron-boron matrix, the coating is bright and dense, and the corrosion resistance is improved. DETAILED DESCRIPTION - Preparation of nickel-cobalt-based nanocomposite coating for sintering neodymium-iron-boron, involves (S1) before electroplating the sintered neodymium-iron-boron, pre-treating the surface of the sintered neodymium-iron-boron, (S2) preparing nickel-cobalt alloy electroplating solution and composite nanomaterial additive solution, (S3) mixing the prepared nickel-cobalt alloy electroplating solution and the composite nano-material additive solution according to a certain volume ratio to form a composite nickel-cobalt-based nano-electroplating solution, (S4) using the composite nickel-cobalt-based nano-electroplating solution to electroplate the surface of the sintered neodymium-iron-boron, and controlling the electroplating time within 60-120 minutes, and (S5) after cleaning the electroplating sintered neodymium-iron-boron with deionized water, surface conditioning and drying, and forming a nickel-cobalt-based nanocomposite coating on the surface of the sintered neodymium-iron-boron. The preparation of the nickel-cobalt alloy electroplating solution involves (S1) dissolving nickel sulfate, nickel chloride and cobalt sulfate in deionized water and heating to 100-120degrees Celsius, and maintaining the main salt solution after fully stirring between 35-45degrees Celsius and (S2) adding boric acid, sodium sulfate, magnesium sulfate, and sodium dodecyl sulfate into deionized water respectively, adding them to the main salt solution after fully dissolving, and fully stirring to obtain a nickel-cobalt alloy electroplating solution. The preparation of the composite nano-material additive solution involves (S1) adding one or more aluminum oxide, silicon dioxide, zirconium dioxide nano-particles, graphene, molybdenum disulfide into absolute ethanol for ultrasonic cleaning, (S2) dissolving one or more of ammonium sulfate, polyethylene glycol, and tert-butanol in deionized water to prepare a dispersion, and (S3) adding the cleaned nano-materials to the dispersion, and ultrasonically stirring for 2 hours to obtain a composite nano-material additive solution.