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Method for preparing magnesium alloy composite coating with decorativeness and functionality

A composite coating and magnesium alloy technology, applied in metal material coating process, coating, vacuum evaporation plating, etc., can solve the problems of no metallic luster, no metallic luster, poor heat dissipation, etc.

Active Publication Date: 2016-08-24
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent ZL201010267526.8 discloses a combination of two surface treatment technologies, chemical conversion and micro-arc oxidation, by introducing Mn into the film 2+ and V 5+ , to prepare a dark micro-arc oxidation film, which has good corrosion resistance and decorative properties, but no metallic luster
The film layer has excellent comprehensive performance, which can fully meet the requirements of my country's national defense military industry, aerospace and other fields for corrosion resistance, moisture resistance and other performance of magnesium alloy coatings, but it has no metallic luster and poor heat dissipation performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Pretreatment: Use 400~1000# sandpaper or grinder to polish the surface of the magnesium alloy, remove oil and degrease;

[0019] 2. Micro-arc oxidation: The electrolyte composition of micro-arc oxidation is: sodium silicate 15g / L, sodium hydroxide 4g / L, sodium metaaluminate 3g / L, glycerol 2ml / L, and the rest is deionized water , the electrolyte temperature is room temperature, the micro-arc oxidation adopts the control current method, the power frequency is 600Hz, the duty cycle is 12%, and the current density is 2.0A / dm 2 , micro-arc oxidation time 30min;

[0020] 3. Ion cleaning: Assemble the pure zirconium target on the target position of the vacuum coating chamber, then place the magnesium alloy cleaned and dried after micro-arc oxidation treatment in the vacuum chamber, and first pump it to 8×10 -3 Pa, then heat the vacuum chamber to 150°C, adjust the intake volume of argon gas and the throttle valve to make the vacuum degree reach 3.0Pa, adjust the pulse bias ...

Embodiment 2

[0025] 1. Pretreatment: Use 400~1000# sandpaper or grinder to polish the surface of the magnesium alloy, remove oil and degrease;

[0026] 2. Micro-arc oxidation: The electrolyte composition of micro-arc oxidation is: sodium silicate 5g / L, sodium hydroxide 5g / L, sodium metaaluminate 5g / L, glycerol 8ml / L, and the rest is deionized water , the electrolyte temperature is at room temperature, the micro-arc oxidation adopts the control voltage method, the pulse power frequency is 800Hz, the voltage gradually increases with time, and the increase rate gradually decreases with time, increasing to 350V in 10 minutes, and the micro-arc oxidation time is 40 minutes;

[0027] 3. Ion cleaning: Assemble the pure titanium target on the target position of the vacuum coating chamber, then place the magnesium alloy cleaned and dried after micro-arc oxidation treatment in the vacuum chamber, and first pump it to 8×10 -3 Pa, then preheat the vacuum chamber to 120°C, adjust the intake volume of a...

Embodiment 3

[0032] 1. Pretreatment: Use 400~1000# sandpaper or grinder to polish the surface of the magnesium alloy, remove oil and degrease;

[0033] 2. Micro-arc oxidation: The electrolyte composition of micro-arc oxidation is: sodium silicate 20g / L, sodium hydroxide 2g / L, sodium metaaluminate 1g / L, glycerol 6ml / L, and the rest is deionized water , the electrolyte temperature is room temperature, the micro-arc oxidation adopts the controlled current method, the power frequency is 600Hz, the duty cycle is 12%, and the current density is 3.0A / dm 2 , micro-arc oxidation time 20min;

[0034] 3. Ion cleaning: Assemble the pure titanium target on the target position of the vacuum coating chamber, then place the magnesium alloy cleaned and dried after micro-arc oxidation treatment in the vacuum chamber, and first pump it to 7×10 -3 Pa, then preheat the vacuum chamber to 100°C, adjust the intake volume of argon gas and the throttle valve to make the vacuum degree reach 2.5Pa, adjust the pulse bi...

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Abstract

A method for preparing a magnesium alloy composite coating with decorativeness and functionality comprises the following steps that the surface of a magnesium alloy is polished, and oil removal and degreasing are carried out; micro-arc oxidation is carried out, wherein an electrolyte is subjected to micro-arc oxidation, a current or voltage control method is adopted, the micro-arc oxidation time ranges from 25 min to 60 min, and the thickness of an oxidation film ranges from 5 micrometers to 50 micrometers; ion cleaning is carried out, wherein a component is put in a vacuum coating chamber, the pressure of argon, the pulsed bias voltage and the duty ratio are adjusted, and discharge cleaning is carried out; a metal layer is subjected to pre-coating, wherein a zirconium target or titanium target arc source is adopted, the bias voltage duty ratio and the bias voltage are adjusted, and the metal layer is subjected to coating; and arc ion coating is carried out, wherein the zirconium target or titanium target arc source is adopted, nitrogen or / and acetylene is / are introduced at the vacuum degree being (3-6)*10<-1> Pa, the pulsed bias voltage and the duty ratio are adjusted, the arc current ranges from 60 A to 100 A, and the coating time ranges from 10 min to 60 min. The method for preparing the magnesium alloy coating integrating high decorativeness, high corrosion resistance, high wear resistance and high heat radiation performance belongs to the environment-friendly surface treatment technology.

Description

technical field [0001] The invention relates to a preparation method of a magnesium alloy composite coating, in particular to micro-arc oxidation technology and physical vapor deposition technology. Background technique [0002] Magnesium alloy has the characteristics of high specific strength and specific stiffness, good casting performance, excellent electrical shielding and damping performance, and recyclability. It is widely used in aerospace, automobile and motorcycle, tools, electronic communications, optical instruments, computer manufacturing and other fields. . However, the electrode potential of magnesium alloy is extremely negative (-2.36V), and the volume ratio of natural oxide film to metal is 0.79. The natural oxide film cannot completely cover the substrate, and is loose and porous, which cannot protect the magnesium alloy substrate and has poor corrosion resistance. In order to improve the corrosion resistance of the magnesium alloy surface, many surface tre...

Claims

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Application Information

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IPC IPC(8): C25D11/30C23C14/32
CPCC23C14/0021C23C14/325C25D11/30
Inventor 宋东福周楠黎小辉郑开宏李继林黄正华
Owner GUANGDONG INST OF NEW MATERIALS
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