A kind of nickel-molybdenum-aluminum coating and preparation method thereof

Abstract

The invention discloses a nickel-molybdenum-aluminum coating and a preparation method thereof. The nickel-molybdenum-aluminum coating is composed of three elements: nickel, molybdenum and aluminum. Calculated by mass percentage, nickel: molybdenum: aluminum is 64.73-50.27%: 33.27-41.23% : 2.00~8.50%. The preparation method is to add nickel salt, molybdenum compound, aluminum salt, complexing agent, chloride, and electroplating accelerator to water, stir and dissolve, adjust the pH value of the solution to 7.5-9.5 with sodium carbonate solution, and obtain nickel salt-molybdenum compound- Aluminum salt-complexing agent-chloride-plating accelerator electroplating solution; the plated piece to be plated is used as a cathode, and the anode is nickel, put into nickel salt-molybdenum compound-aluminum salt-complexing agent-chloride-electroplating accelerator Pulse electroplating is carried out in an electrolytic plating solution. After electroplating, the plated parts are rinsed with water and air-dried to obtain a layer of nickel-molybdenum-aluminum coating with strong oxidation and corrosion resistance on the surface of the plated parts.

Description

technical field [0001] The invention relates to a nickel-molybdenum-aluminum coating and a preparation method thereof. Background technique [0002] With the development of aero-engines toward high thrust-to-weight ratios, the design inlet temperature of aero-engines continues to increase, and the use of high-temperature structural materials alone cannot meet the urgent requirements of the rapid development of advanced aero-engines. At present, the practical way to greatly increase the operating temperature of aero-engines is to use thermal barrier coating technology. Most of the thermal barrier coatings that have been applied in practice have a double-layer structure, and the ceramic layer is used as the surface layer of the thermal barrier coating because of its heat insulation, corrosion resistance, erosion and erosion properties. Due to the thermal expansion coefficient mismatch between ceramics and high-temperature structural materials, a metal bonding layer is require...

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Problems solved by technology

[0003] At present, thermal barrier coatings use nickel coating, nickel molybdenum coating, nickel molybdenum rare earth coating, nickel molybdenum-molybdenum disilicide coating, nickel molybdenum rare earth-molybdenum disilicide coating as the bonding layer, but the above-mentioned bonding layer materials all have oxidation resistance. Corrosion performance is not very strong and other technical problems