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, excellent corrosion resistance, and firm surface bonding

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 wav

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
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Example Embodiment

[0039] Example 1:

[0040] Step 1: Use magnesium alloy plate, here select AZ91D aluminum alloy for processing. Place the surface of the magnesium alloy to be processed in the electrolyte. The electrolyte includes sodium silicate with a concentration of 1-50g / L (20g / L in this embodiment), sodium hydroxide with a concentration of 1-10g / L (3g / L in this embodiment), and a concentration of 1. ~15g / L (8g / L in this embodiment) of sodium carbonate, with a concentration of 1~10g / L (5g / L in this embodiment) Urea (H 2 N-CO-NH 2 ), 1 to 5 g / L (3 g / L in this embodiment) sodium fluorosilicate, 0.1 to 1 g / L (0.5 g / L in this embodiment) sodium fluoride, and the rest is water.

[0041] The surface of the alloy to be processed is used as an electrode, and the inert conductor is used as a counter electrode on the surface of the alloy to be processed. The two electrodes and the power source constitute an electrolysis circuit. The inert conductor referred to here is a conductor that is inert to the s...

Example Embodiment

[0048] Example 2:

[0049] Step 1: Perform the same steps as step 1 in Example 1.

[0050] Step 2: Mix barium titanate: epoxy resin: polyurethane at a mass ratio of 60: 32: 8, the size of the absorber particles is 500 nm to 1 μm, and stir to make it uniformly dispersed.

[0051] Step 3: In the coating prepared in step 2, add curing agent polyamide (the mass ratio of epoxy resin is 1:2), uniformly coat the ceramic layer prepared in step 1, and then dry, with a thickness of 1 or 2 mm, The drying temperature is 50°C.

[0052] The magnesium alloy coated with the 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 electromagnetic wave reflection loss between 13~15GHz 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 reflection...

Example Embodiment

[0053] Example 3:

[0054] Step 1: Perform the same steps as step 1 in Example 1.

[0055] Step 2: Mix carbonyl iron powder: epoxy resin: polyurethane at a mass ratio of 70:25:5, and the size of the absorber particles is 500 nm to 1 μm, and stir to make them uniformly dispersed.

[0056] Step 3: In the coating prepared in step 2, add the curing agent polyamide (the mass ratio of epoxy resin is 1:2), uniformly coat the ceramic layer prepared in step 1, and then dry, the thickness is 1 or 2mm, The drying temperature is 50°C.

[0057] The magnesium alloy coated with the 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 value is -17dB; when the coating thickness is 2mm, the electromagnetic wave is ...

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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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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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