Wave-absorbing functional protecting coating on surface of aluminum alloy and preparation method thereof

A technology of aluminum alloy surface and protective coating, applied in the field of aluminum alloy, can solve problems such as personal safety, equipment stability impact, etc., achieve significant social and economic value, improve protection, and firmly bond the surface.

Inactive Publication Date: 2012-07-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, in recent years, the rapid increase of space electromagnetic waves has had a non-negligible impact on personal safety and equipment stability.

Method used

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  • Wave-absorbing functional protecting coating on surface of aluminum alloy and preparation method thereof
  • Wave-absorbing functional protecting coating on surface of aluminum alloy and preparation method thereof
  • Wave-absorbing functional protecting coating on surface of aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Use aluminum alloy plate, here choose LY12 aluminum alloy for processing. Place the aluminum alloy surface to be processed in the electrolyte. Described electrolytic solution comprises the sodium silicate that concentration is 5~30g / L (this embodiment is 30g / L), the sodium hydroxide that concentration is 1~10g / L (this embodiment is 5g / L), concentration is 1 ~5g / L (the present embodiment is 5g / L) urea, the rest is water. The surface of the alloy to be processed is used as an electrode, the inert conductor is used as a counter electrode of the surface of the alloy to be processed, and the above two electrodes and a power supply form an electrolytic circuit. The inert conductor mentioned here is a conductor (graphite in this embodiment) that is inert to the specific electrolyte solution in this embodiment.

[0035] The control power supply applies a DC or AC pulse voltage, and the pulse frequency is adjusted within the range of 20-3000 Hz (1000 Hz in this embodim...

Embodiment 2

[0042] Step 1: Carry out the same steps as Step 1 of Example 1.

[0043] Step 2: Mix barium titanate:epoxy resin at a mass ratio of 55:45, the particle size of the wave absorbing agent is 50-100nm, heat up to 80°C, and stir to make it uniformly dispersed.

[0044] Step 3: In the coating prepared in step 2, add curing agent polyamide (mass ratio to epoxy resin is 1: 2), evenly coat the ceramic layer prepared in step 1 and dry, with a thickness of 1 or 2mm, The curing temperature is 70°C, and the curing time is 6 hours.

[0045] The neutral salt spray resistance time (ASTM B117 standard) of the coating sample coated with aluminum alloy is ≥6000h, and the absorption curve is as follows image 3 , it can be seen from the figure that when the coating thickness is 1mm, the reflection loss of electromagnetic waves between 11 and 14GHz is less than -10dB, the absorption bandwidth is 3GHz, and the absorption peak is -27dB; when the coating thickness is 2mm, the electromagnetic wave is...

Embodiment 3

[0047] Step 1: Carry out the same steps as Step 1 of Example 1.

[0048] Step 2: Mix carbonyl iron powder: epoxy resin at a mass ratio of 70:30, the particle size of the wave absorbing agent is 50-100nm, heat up to 80°C, and stir to make it uniformly dispersed.

[0049] Step 3: In the coating prepared in step 2, add curing agent polyamide (mass ratio to epoxy resin is 1: 2), evenly coat the ceramic layer prepared in step 1 and dry, with a thickness of 1 or 2mm, The curing temperature is 70°C, and the curing time is 6 hours.

[0050] Aluminum alloy coated with this coating sample has a neutral salt spray resistance time (ASTM B117 standard) ≥ 5500h, and the absorption curve is as follows Figure 4 , it can be seen from the figure that when the coating thickness is 1mm, the reflection loss of the electromagnetic wave between 4.5 and 7.5GHz is less than -10dB, the absorption bandwidth is 3GHz, and the absorption peak is -29dB; when the coating thickness is 2mm, the electromagnet...

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Abstract

The invention relates to the field of aluminum alloys, in particular to a method for preparing a wave-absorbing functional protecting coating on the surface of an aluminum alloy and various coatings prepared by the method. The method comprises the following steps of: preparing a micro-arc oxidized ceramic layer on the surface of the aluminum alloy; and then compounding a wave-absorbing coating on the surface of the oxidized ceramic layer to prepare the aluminum alloy wave-absorbing functional coating with corrosion resistance and a wave-absorbing function, the ceramic layer with a compact microstructure is prepared by the method, and the corrosion resistance of the aluminum alloy is obviously improved. The wave-absorbing coating compounding technology has the effect of sealing the porous ceramic layer, so while the corrosion resistance of the ceramic layer is improved, the wave-absorbing function of the ceramic layer is achieved. In addition, the absorption strength and an absorption peak frequency interval are effectively changed by adjusting the type, the content and the electromagnetic parameters of a wave-absorbing agent and the thickness of a coating. The comprehensive coating prepared by the method has the characteristics of high corrosion resistance, firm surface bonding strength, wide electromagnetic wave-absorbing frequency range and the like, and can be widely applied to fields, such as aviation, spaceflight, military industry and electronic products.

Description

Technical field: [0001] The invention relates to the field of aluminum alloys, in particular to a method for preparing a wave-absorbing functional protective coating on the surface of an aluminum alloy and various coatings prepared by applying the method. Background technique: [0002] Stealth technology has developed rapidly in developed countries and has been applied to advanced weapons and equipment, posing a great threat to my country's military security. As the primary high technology in the military field, it is listed as the basic element of "competitive strategy". In recent years, with the advent of new advanced detectors such as advanced infrared / ultraviolet detectors and millimeter-wave radars, and the urgent need to improve the effectiveness of integrated defense systems, more severe challenges have been posed to the original equipment's stealth technology. Furthermore, in recent years, the rapid increase of space electromagnetic waves has had a non-negligible imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/12C25D11/04C09D5/32
Inventor 杜克勤郭泉忠王福会张伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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