Method for rapid electrolytic-deposition of coating on surface of magnesium alloy
A magnesium alloy and electrodeposition technology, which is applied in the field of metal surface treatment, can solve problems such as environmental pollution and complicated pretreatment, and achieve the effects of simplifying the electroplating process, simplifying the electroplating process, and simple operation
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Embodiment 1
[0035] Due to the high chemical activity of the magnesium alloy, the reaction is violent in the acidic bath with a pH of 4, and cannot be directly electroplated. The present invention adopts a rapid electrodeposition method to deposit a nickel-molybdenum alloy coating on the surface of the magnesium alloy. The specific steps are as follows:
[0036] 1. Sand blast the surface of the magnesium alloy and place it in absolute ethanol for ultrasonic cleaning. The working gas for sand blasting is compressed air with a pressure of 0.4-0.6 MPa;
[0037] 2. Prepare a cold spray coating on the surface of the magnesium alloy after sandblasting by cold spraying. The coating material is a mechanically mixed powder of dendritic copper powder and irregular alumina powder, wherein the mass fraction of alumina powder 20%, the cold spraying gas preheating temperature is 600°C, the powder feeding rate is 25g / min, and the powder feeding distance is 10mm, so that the surface of the magnesium alloy ...
Embodiment 2
[0046] Adopt rapid electrodeposition method to prepare cobalt coating on the surface of magnesium alloy, its specific steps are as follows:
[0047] 1. Sand blast the surface of the magnesium alloy and place it in absolute ethanol for ultrasonic cleaning. The working gas for sand blasting is compressed air with a pressure of 0.6 MPa;
[0048] 2. Prepare a cold spray coating on the surface of the magnesium alloy after sandblasting by cold spraying. The coating material is a mechanically mixed powder of dendritic copper powder and irregular alumina powder, wherein the mass fraction of alumina powder 20%, the cold spraying gas preheating temperature is 600°C, and the powder feeding distance is 10mm, so that the surface of the magnesium alloy forms a cold sprayed copper-based coating;
[0049] 3. Place the cold-sprayed copper-based coating in the electroplating solution (CoSO with a concentration of 110g / L 4 ·6H 2 O, Na with a concentration of 100g / L 2 SO 4 , with a concentrat...
Embodiment 3
[0052] Different from Example 1 in that: the electroplating solution described in step 3 is 60g / L NiSO 4 ·6H 2 O, 75g / L Na 3 C 6 h 5 o 7 2H 2 O, 5g / L Na 2 MO 4 2H 2 O, 35g / L NiCl 2 , 25g / L of H 3 BO 3 , 1g / L sodium saccharin, 0.1g / L sodium lauryl sulfate; the parameters of the electroplating are: the duty cycle of the power pulse signal is 18%, and the average current density is 5A / dm 2 , the temperature is 25°C, and the pole spacing of the electrodes is 15mm.
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