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
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[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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