Preparation method for metal surface corrosion resistant/radiating/electromagnetic shielding composite coating

A metal surface and electromagnetic shielding technology, applied in the direction of surface reaction electrolytic coating, metal material coating process, coating, etc., can solve the problem of coating heat dissipation efficiency, thermal stability, and unsatisfactory bonding force, coating Complicated structure and other issues, to achieve excellent heat dissipation effect, good electromagnetic shielding effect, and improve corrosion resistance

Active Publication Date: 2017-02-15
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application publication number is CN105491788A, the application publication date is April 13, 2016, and the invention patent application titled "a graphene heat dissipation shielding film and its preparation method", the patent is to prepare a carrier film layer on a flexible printed circuit board , ink layer, graphene heat dissipation layer, and conductive adhesive layer to achieve heat dissipation and electronic shielding, but the coating structure prepared by this method is cumbersome, the process is complicated, and there is a large interface heat between layers. resistance, which seriously affects the heat dissipation efficiency of the coating, and the adhesive used in this method is an organic binder, and the emissivity of the prepared coating is low, and the thermal stability and bonding force are not very ideal.
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  • Preparation method for metal surface corrosion resistant/radiating/electromagnetic shielding composite coating
  • Preparation method for metal surface corrosion resistant/radiating/electromagnetic shielding composite coating
  • Preparation method for metal surface corrosion resistant/radiating/electromagnetic shielding composite coating

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Embodiment 1

[0037] A method for preparing a metal surface anti-corrosion / heat dissipation / electromagnetic shielding composite coating of the present embodiment is as follows:

[0038] 1. Choose 6061 aluminum alloy as the substrate, polish the surface with 600, 800, 1000 and 1200# sandpaper in sequence, and then use acetone and alcohol to ultrasonically clean it for 15 minutes;

[0039] Two, with NaAlO 2 : 1g / L, NaOH: 1g / L, nano-Al 2 o 3 : 1g / L and sodium dodecyl benzene sulfonate: 1g / L mixed, mechanically stirred evenly, prepared nano-Al 2 o 3 Modified micro-arc oxidation electrolyte;

[0040] 3. With the stainless steel plate of the electrolytic cell as the cathode and the 6061 aluminum alloy as the anode, use the micro-arc oxidation electrolyte prepared in step 2, then use the pulse power supply as the power supply, apply a voltage of 300V at both ends of the electrolytic cell, and when the voltage is Under the conditions of 300V, temperature below 50°C and stirring, the oxidation ...

Embodiment 2

[0046] A method for preparing a metal surface anti-corrosion / heat dissipation / electromagnetic shielding composite coating of the present embodiment is as follows:

[0047] 1. Select AlN reinforced magnesium matrix composite material with high thermal conductivity as the matrix, polish the surface of the matrix with 600, 800, 1000 and 1200# sandpaper in sequence, and then ultrasonically clean it with acetone and alcohol for 20 minutes respectively;

[0048] Two, with NaAlO 2 : 4g / L, NaOH: 2g / L, nano-Al 2 o 3 : 6g / L and stearic acid: 1g / L are mixed, mechanically stirred evenly, and nano-Al 2 o 3 Modified micro-arc oxidation electrolyte;

[0049] 3. Use the stainless steel plate of the electrolytic cell as the cathode, and the AlN reinforced magnesium-based composite material with high thermal conductivity as the anode, use the micro-arc oxidation electrolyte prepared in step 2, and then use the pulse power supply as the power supply, and apply 800V at both ends of the electr...

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Abstract

The invention discloses a preparation method for a metal surface corrosion resistant/radiating/electromagnetic shielding composite coating. The preparation method comprises the following steps: first, preparing a corrosion resistant and high thermal conductive bottom layer on the surface of a metal shell of a power component by adopting a nano-Al2O3 modified micro-arc oxidation technology; coating the micro-arc oxidation bottom layer with a graphene oxide dispersing liquid which is prepared by an improved Hummers method to obtain a preset graphene oxide layer; then, reducing the graphene oxide layer which is preset on the micro-arc oxidation bottom layer by using vitamin C to obtain an micro-arc oxidation/graphite composite coating for the surface of the metal shell of the power component. The composite coating prepared by the method has excellent performance: the salt-fog resistance is greater than 1,500 hours; the thermal conductivity is high; the emissivity is greater than 0.8; the radiating and cooling effect reaches 10 to 20 percent; the static contact angle is greater than 120 degrees; the electromagnetic shielding effect is greater than 50 dB. According to the preparation method, the problems that the metal (namely, an aluminium, magnesium and titanium alloy and a composite material thereof) shell of the power component used in marine climate and environment is poor in corrosion resistance and low radiating efficiency in a service process are solved.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of metal surface anti-corrosion / heat dissipation / electromagnetic shielding composite coatings, and in particular relates to a preparation method of metal surface anti-corrosion / heat dissipation / electromagnetic shielding composite coatings. Background technique [0002] Power component housings used in marine climate environments require excellent corrosion resistance, excellent heat dissipation (conduction and radiation) performance and high electrical conductivity (electromagnetic shielding) during service. However, the corrosion resistance of power component metals (aluminum, magnesium, titanium alloys and their composite materials) is far from meeting the service conditions; at the same time, the efficiency of a single conduction cooling method for metal shells of components is extremely limited, while metal shells (such as aluminum, Magnesium and titanium alloys) have very low radi...

Claims

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Application Information

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IPC IPC(8): C23C28/04C25D11/02C23C24/00
CPCC23C24/00C23C28/04C25D11/026
Inventor 王亚明邹永纯白力文刘阳赵超谢凌云王馨敏贾德昌周玉
Owner HARBIN INST OF TECH
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