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Comprehensive protective wave-absorbing coating on surface of magnesium alloy and preparation method thereof

A wave-absorbing coating and magnesium alloy technology, applied in the field of magnesium alloys, can solve problems such as personal safety and equipment stability, and achieve the effects of wide electromagnetic wave absorption frequency band, high absorption rate, and firm surface bonding

Inactive Publication Date: 2014-12-10
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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  • Comprehensive protective wave-absorbing coating on surface of magnesium alloy and preparation method thereof
  • Comprehensive protective wave-absorbing coating on surface of magnesium alloy and preparation method thereof
  • Comprehensive protective wave-absorbing coating on surface of magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1: Magnesium alloy plate is used, here AZ91D aluminum alloy is selected for processing. Place the surface of the magnesium alloy to be processed in the electrolyte. Described electrolytic solution comprises the sodium silicate that concentration is 1~50g / L (the present embodiment is 20g / L), and the concentration is the sodium hydroxide of 1~10g / L (the present embodiment is 3g / L), and concentration is 1 ~15g / L (the present embodiment is 8g / L) sodium carbonate, concentration is 1~10g / L (the present embodiment is 5g / L) urea (H 2 N-CO-NH 2 ), 1~5g / L (the present embodiment is 3g / L) sodium fluorosilicate, concentration is the sodium fluoride of 0.1~1g / L (the present embodiment is 0.5g / L), all the other are water.

[0041] 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...

Embodiment 2

[0049] Step 1: Carry out the same steps as Step 1 of Example 1.

[0050] Step 2: Mix barium titanate: epoxy resin: polyurethane in a mass ratio of 60:32:8, and the particle size of the wave absorbing agent is 500nm-1μm, and stir to make it uniformly dispersed.

[0051] 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 drying temperature is 50°C.

[0052] The magnesium alloy coated with this coating sample has a neutral salt spray resistance time (ASTM B117 standard) ≥ 1100h, 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 the electromagnetic wave between 13 and 15GHz is less than -10dB, the absorption bandwidth is 2GHz, and the absorption peak is -15dB; when the coating thickness is 2mm, the electromagnetic wave is 11.5~ The reflectio...

Embodiment 3

[0054] Step 1: Carry out the same steps as Step 1 of Example 1.

[0055] Step 2: Mix carbonyl iron powder: epoxy resin: polyurethane in a mass ratio of 70:25:5, and the particle size of the wave-absorbing agent is 500nm-1μm, and stir to make it uniformly dispersed.

[0056] 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 drying temperature is 50°C.

[0057] The magnesium alloy coated with this coating sample has a neutral salt spray resistance time (ASTM B117 standard) ≥ 900h, 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 electromagnetic waves between 2 and 5GHz is less than -10dB, the absorption bandwidth is 3GHz, and the absorption peak is -17dB; when the coating thickness is 2mm, the electromagnetic wave 1~5GHz The reflection ...

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Abstract

The invention relates to the field of magnesium alloy, in particular to a preparation method of a comprehensive protective wave-absorbing coating on the surface of magnesium alloy and various coatings prepared by the method. The wave-absorbing coating is coated on a micro-arc oxidized ceramic layer on the surface of the magnesium alloy, so that the comprehensive coating which is good in corrosion resistance and in wave-absorbing functionality can be prepared. The invention adopts a magnesium alloy micro-arc oxidation technology and a wave-absorbing coating composite technology, the stable micro-arc oxidation technology is carried out in case of large area by the magnesium alloy micro-arc oxidation technology, and a ceramic layer with a compact microstructure is prepared, so that the corrosion resistance of the magnesium alloy can be obviously improved. The wave-absorbing coating composite technology can be used for sealing the ceramic layer, so that the corrosion resistance of the ceramic layer can be further improved, and the ceramic layer has the function of wave absorption as well. The comprehensive coating provided by the invention has the characteristics of being good in corrosion resistance, wide in electromagnetic wave absorbing frequency range, high in absorption rate, firm in surface bonding and the like, is widely applicable to the fields such as aviation, aerospace, war industry and electronic products, and is high in social value and economic value.

Description

Technical field: [0001] The invention relates to the field of magnesium alloys, in particular to a method for preparing a comprehensive protective wave-absorbing coating on the surface of a magnesium 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 our 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-negligib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30C09D5/32
Inventor 王福会杜克勤郭泉忠张伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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