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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

Active Publication Date: 2019-03-19
东莞市先力得热处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the high chemical activity and strong electronegativity of magnesium alloys, the pretreatment before electroplating in the traditional magnesium alloy electroplating process is very complicated. The electroplating pretreatment requires copper plating, zinc plating, and cyanide. , very serious environmental pollution

Method used

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  • Method for rapid electrolytic-deposition of coating on surface of magnesium alloy
  • Method for rapid electrolytic-deposition of coating on surface of magnesium alloy
  • Method for rapid electrolytic-deposition of coating on surface of magnesium alloy

Examples

Experimental program
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Effect test

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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Abstract

The invention belongs to the technical field of metal surface treatment, and discloses a method for rapid electrolytic-deposition of a coating on a surface of a magnesium alloy. According to the method, sand blasting equipment is adopted for carrying out sand blasting treatment on the surface of the magnesium alloy, then ultrasonic cleaning is carried out on the surface of the magnesium alloy, anda coating material is sprayed on the surface of the magnesium alloy which is subjected to the sand blasting treatment by adopting a cold spraying method; the working gas of the cold spraying is compressed air, wherein the pressure is 0.6 MPa to 0.8 MPa, the preheating temperature of the cold spraying gas is 400-600 DEG C, the powder feeding distance is 10 mm, the relative moving speed of a nozzleis 600-2000 mm / min, and a cold-sprayed copper-based coating is prepared; and the cold-sprayed copper-based coating is placed in an electroplating solution, electroplating parameters are set, and a composite coating of a copper base and an electroplating layer is prepared through electroplating. The composite coating is good in microstructure and stable in physical property, the bonding strength of the cold-sprayed coating and the base material is high, the thickness of the cold spraying layer and the base material is controllable, and the composite coating has excellent corrosion resistance and wear resistance. According to the method, the electroplating process of the magnesium alloy is simplified, and the pollution to the environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and more specifically relates to a method for rapidly electrodepositing a coating on the surface of a magnesium alloy. Background technique [0002] Magnesium alloy is the lightest metal structural material in engineering applications, its density is only 1.74g / cm, which is two-thirds of aluminum alloy and one-quarter of steel. It is known as the most promising green structural material in the 21st century . In addition, magnesium alloy also has a variety of unique advantages: good shock absorption, elastic modulus as low as 45000MPa, suitable for shock-proof parts, such as aircraft landing wheels, automobile shock absorbers, etc.; higher specific strength and specific Stiffness; excellent fatigue strength; good electromagnetic shielding performance; good thermal conductivity; easy processing, easy recycling, recyclable and so on. The various advantages of magnesium alloy make i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08C23C28/02C25D3/12C25D3/56C25D5/18
CPCC23C24/085C23C28/021C23C28/027C25D3/12C25D3/562C25D5/18
Inventor 张留艳杨水梅揭晓华麦永津
Owner 东莞市先力得热处理有限公司
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