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Preparation method of composite coating on metal surface and modified metal material

A composite coating, metal surface technology, applied in the direction of coating, electrolytic coating, electrolytic organic material coating, etc., can solve the problems of limited degree and limitation of metal corrosion resistance, and achieve the effect of improving corrosion resistance

Active Publication Date: 2020-06-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of treating the metal surface is mainly micro-arc oxidation treatment, but this method has a limited effect on improving the corrosion resistance of the metal.
In order to further improve the corrosion resistance and chemical stability of metal alloys and make them have multifunctional properties, in the prior art, organic emulsions are added to the electrolyte to prepare a micro-arc oxidation composite coating on the metal surface. The composite coating, the organic particles only cover a small amount on the surface of the micro-arc oxidation layer or distribute in a very thin layer (within a thickness of micron), and the thickness of the composite coating is very different from the thickness of the micro-arc oxidation layer, which is very important for further improving the corrosion resistance of magnesium alloys. role is limited

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  • Preparation method of composite coating on metal surface and modified metal material
  • Preparation method of composite coating on metal surface and modified metal material
  • Preparation method of composite coating on metal surface and modified metal material

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preparation example Construction

[0034] Embodiments of the present invention provide a method for preparing a composite coating on a metal surface, comprising the steps of:

[0035] Configure a composite electrolyte containing low surface energy organic nanopowders;

[0036] Control the temperature of the composite electrolyte to 60-90°C, and under the pulse voltage of 400V-1000V, use strong pulse high-frequency discharge reaction and auxiliary cross-linking curing in the composite electrolyte to form a composite coating on the surface of the metal substrate. The composite coating includes The ceramic layer and the polymer layer may be referred to as ceramic polymer coating for short.

[0037] In this embodiment, the process of preparing the ceramic polymer composite coating on the surface of the metal substrate by means of strong pulse high-frequency discharge reaction and auxiliary cross-linking curing is as follows: a stainless steel plate or a stainless steel pool is used as the cathode, and the metal sub...

Embodiment 1

[0061] This embodiment provides a method for preparing a composite coating on the surface of a magnesium alloy, the steps are as follows:

[0062] 1.1 Choose AZ31 magnesium alloy as the substrate, polish the surface of the substrate with 800#, 1200# and 1500# sandpaper in sequence, and then ultrasonically clean it with absolute ethanol and deionized water for 20 minutes respectively;

[0063] 1.2 Mix 15g / L sodium silicate, 6g / L sodium hexametaphosphate, 3g / L potassium fluoride, 2g / L sodium hydroxide, 5g / L sodium tungstate and stir evenly to prepare the base solution;

[0064] 1.3 Add 50g / L modified organic polytetrafluoroethylene nanopowder into the base solution, and disperse it ultrasonically for 30 minutes to prepare a composite electrolyte with good stability, dispersion and fluidity;

[0065] 1.4 Heat the composite electrolyte to 70°C and keep stirring;

[0066] 1.5 With the stainless steel plate or stainless steel pool as the cathode and the AZ31 magnesium alloy as the ...

Embodiment 2

[0087] This embodiment provides a method for preparing a composite coating on the surface of a magnesium alloy, the steps are as follows:

[0088] 2.1 Choose AZ31 magnesium alloy as the substrate, polish the surface with 800#, 1200# and 1500# sandpaper in sequence, and then ultrasonically clean it with absolute ethanol and deionized water for 30 minutes respectively;

[0089] 2.2 Mix 6g / L sodium silicate, 12g / L sodium phosphate, 4g / L potassium fluoride, 5g / L sodium hydroxide, and 5g / L sodium tungstate and stir them evenly to prepare the base solution;

[0090] 2.3 Add 80g / L low surface energy organic polytetrafluoroethylene nanopowder into the base solution, and ultrasonically disperse for 50 minutes to prepare a composite electrolyte solution with good stability, dispersibility and fluidity;

[0091] 2.4 Heat the composite electrolyte to 80°C and keep stirring;

[0092] 2.5 With the stainless steel plate or stainless steel pool as the cathode and the AZ31 magnesium alloy as ...

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Abstract

The invention provides a preparation method of a composite coating on a metal surface and a modified metal material. The preparation method of the composite coating on the metal surface includes the steps that composite electrolyte containing low-surface-energy organic nano-powder is prepared; and the temperature of the composite electrolyte is controlled to be 60 DEG C-90 DEG C, under the pulsedvoltage of 400 V-1,000 V, the composite coating is formed on the surface of a metal matrix by using a high power pulse high-frequency discharge reaction and auxiliary cross-linking and curing in the composite electrolyte, and the composite coating includes a ceramic layer and a polymer layer. According to the preparation method of the composite coating on the metal surface, the low-surface-energyorganic nano-powder is added into the electrolyte, in a micro-zone environment of the high power pulse voltage and the high-temperature electrolyte, and through the synergistic effect of activation induction, electrostatic adsorption, auxiliary cross-linking and chemical mosaic, the low-surface-energy organic nano-powder is deposited on the surface of the metal matrix in one step to prepare the large-thickness coating with a graded micro-nano structure, full coverage of organic polymers with low surface energy on the surface of the ceramic layer is achieved, and the corrosion resistance of themetal matrix is greatly improved.

Description

technical field [0001] The invention relates to the technical field of alloy surface treatment, in particular to a preparation method of a metal surface composite coating and a modified metal material. Background technique [0002] Metal corrosion is a common phenomenon in which metal materials are damaged by chemical or electrochemical multiphase reactions with the surrounding medium. The application and development of metals and their alloys are often affected by their corrosion resistance. For example, magnesium alloys have high strength, The properties of low density, high damping capacitance, plasticity and easy processing are widely used in aviation, automobile and electronic industries. However, due to its poor corrosion resistance and low wear resistance, its wider application is limited. For example, magnesium and its alloys lose their functions rapidly under the action of corrosive active media as parts. Therefore, in order to prolong the product life cycle of met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/18C25D9/02C25D15/00
CPCC25D5/18C25D9/02C25D15/00
Inventor 王亚明王树棋邹永纯贾德昌周玉
Owner HARBIN INST OF TECH