Cavitation corrosion gradient reparation coating of water pump blade and producing method thereof

A technology of blades and water pumps, which is applied in coatings, chemical instruments and methods, metal material coating processes, etc., can solve the problems that cannot completely solve the problems of water pump flow parts, high weldability requirements of workpiece substrate materials, and large substrate deformation. , to achieve excellent cavitation resistance, good sealing effect and low cost

Active Publication Date: 2011-10-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surfacing welding method can form a metallurgical bond between the welding layer and the substrate, and the bonding strength is high, but the dilution rate is large, the welding layer is thick and uneven, the machining a

Method used

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  • Cavitation corrosion gradient reparation coating of water pump blade and producing method thereof
  • Cavitation corrosion gradient reparation coating of water pump blade and producing method thereof
  • Cavitation corrosion gradient reparation coating of water pump blade and producing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Sand blast ZG230-450 to obtain a rough surface. First, use high-energy arc spraying NiAl alloy as the bottom bonding layer with a thickness of 0.2mm, and then alternately use high-energy arc spraying to spray the working layer of Fe-based alloy and the composition is The bonding layer of NiAl alloy has a total thickness of 2 mm. Among them, the Fe-based alloy can be specifically coated with low-carbon steel alloy powder. The powder composition is 2.0% boron, 3.0% silicon, 10% chromium, and the rest is iron by weight percentage; finally, the Fe-based alloy is sprayed with high-energy arc. Working layer, total thickness 2.5mm. The working layer contains amorphous and nanocrystalline. Finally, seal the pores with organic silicon, which contains 3%wt nano-ceramic Al 2 o 3 . The bonding strength between the coating and the substrate is 45MPa, the hardness of the working layer is 640HV, and the cavitation resistance of the gradient composite coating is close to that of 1C...

Embodiment 2

[0034] Sand blast ZG230-450 to obtain a rough surface. First, high-energy arc spraying NiAl bonded base layer, thickness 0.15mm, and then alternating high-energy arc spraying Fe-based alloy (3.5% by weight boron, 2.5% silicon, 12% chromium, The rest is Fe) and NiAl alloy layer, with a total thickness of 5mm, and then high-energy arc spraying Fe-based working layer containing amorphous and nanocrystalline, with a total thickness of 6.6mm, and finally sealed with organic silicon, which contains 5% nano-Al 2 o 3 , The bonding strength is 40MPa, the hardness of the working layer is 750HV, and the cavitation resistance of the gradient composite coating is close to that of 1Cr18Ni9Ti.

example 3

[0036] Sand blast ZG230-450 to obtain a rough surface. First, high-energy arc spraying NiAl bonded base layer, thickness 0.15mm, and then alternating high-energy arc spraying Fe-based alloy (4.0% by weight boron, 3.0% silicon, 15% chromium, The rest is iron) and NiAl alloy layer, with a total thickness of 5mm, and then high-energy arc spraying Fe-based alloy, the working layer contains amorphous and nanocrystalline, with a total thickness of 8.0mm, and finally sealed with epoxy resin. Contains 5% nano Al 2 o 3 , The coating and bonding strength is 38MPa, the hardness of the working layer is 900HV, and the cavitation resistance of the gradient composite coating is close to 1Cr18Ni9Ti.

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Abstract

The invention discloses a cavitation corrosion gradient reparation coating of a water pump blade and a producing method thereof. The gradient reparation coating is produced by high-energy arc spraying, and is formed by alternatively and sequentially arranging an adhering layer and a work layer from a substrate of the water pump blade to the surface of the coating; the outmost layer is the work layer which contains amorphous and nanocrystalline; the material of the adhering layer is NiAl alloy, wherein Ni accounts for 20-80wt%; the material of the work layer is ferrous alloy; and the total thickness of the gradient reparation coating is 0.1-15mm. The method comprises the following steps of: spraying the adhering layer on the surface of the substrate of the water pump blade which is subjected to normal spraying treatment by the high-energy arc method; then continuously spraying the work layer on the surface of the adhering layer, and spraying the adhering layer on the surface of the work layer by the high-energy arc method, alternatively carrying out the step until achieving the thickness required for reparation, and finally spraying the work layer; and sealing holes on the surface of the work layer. The gradient reparation coating has excellent cavitation corrosion resistant performance.

Description

technical field [0001] The invention relates to a water pump blade cavitation repair coating and a preparation method thereof, in particular to a gradient coating and a preparation method thereof. Background technique [0002] Cavitation erosion is the main damage form of water pumps and other hydraulic machinery flow components. Under the action of various factors such as cavitation, corrosion, and rust, the surface of the pump blades peels off in a large area, forming a honeycomb surface with protrusions and holes, which greatly shortens the service life of the pump, reduces operating efficiency, and aggravates vibration. The safe and reliable operation of the pumping station poses a threat. [0003] Water pump materials have experienced the development process from bronze and cast iron to carbon steel and stainless steel. Chinese researchers have successively developed Cr5Cu, Cr8CuMo, 0Cr13Ni4CuMo, 0Cr13Ni6Mo, 0Cr13Ni4Mo, 0Cr13Ni5Mo, 17-4PH and other steel types. In th...

Claims

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Application Information

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IPC IPC(8): B32B15/01C23C4/12C23C4/06C23C4/18F04D29/02C23C4/08C23C4/131
Inventor 吴玉萍洪晟何智华李改叶
Owner HOHAI UNIV
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