Preparation method of magnesium alloy surface micro-arc oxidation/spray coating compound film

A technology of micro-arc oxidation and magnesium alloy, which is applied to the device for coating liquid on the surface, anodizing, coating, etc. Area processing and other problems, to achieve the effect of good bonding, easy control of the preparation process, and high bonding strength

Active Publication Date: 2010-10-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the film layer obtained by chemical conversion coating, anodic oxidation and vapor deposition in the existing magnesium alloy surface treatment method is thin and has poor corrosion resistance; the cost of ion implantation method is high, and it is difficult to realize large-area processing; the coating and The problem of poor bonding force of magnesium alloy matrix and easy aging of organic coating, the invention provides a preparation method of micro-arc oxidation / spray coating composite film on the surface of magnesium alloy

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  • Preparation method of magnesium alloy surface micro-arc oxidation/spray coating compound film

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specific Embodiment approach 1

[0018]Specific Embodiment 1: The preparation method of the micro-arc oxidation / spray coating composite film on the surface of magnesium alloy in this embodiment is realized through the following steps: 1. The magnesium alloy is pretreated to remove the surface oxide film, and then the pretreated magnesium alloy is used as The working electrode is placed in the electrolyte, the stainless steel tank is used as the electrolytic cell and the counter electrode, and the constant voltage or constant current mode is used for micro-arc oxidation for 5-20 minutes, that is, a porous micro-arc oxidation ceramic film is obtained on the magnesium alloy, and the composition of the electrolyte is : 6~30g / L of Na 2 SiO 3 , 0~5g / L NaF and 0~5g / L NaOH, the solvent is water; in constant voltage mode, the control voltage is 350~550V, the frequency is 300~2000Hz, and the duty cycle is 10~45%; constant current mode, the control current density is 2~5A / dm 2 , the frequency is 300~2000Hz, and the du...

specific Embodiment approach 2

[0021] Embodiment 2: This embodiment differs from Embodiment 1 in that the magnesium alloy in step 1 is AZ91D magnesium alloy, AZ31B magnesium alloy, magnesium-lithium alloy, MB26 or ZM5. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0022] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the magnesium alloy is pretreated in step 1: cleaning the surface of the magnesium alloy with decontamination powder, and then rinsing it with clean water, and the magnesium alloy after cleaning Grind and polish with 240#, 400#, 800# and 1000# water-resistant sandpaper in turn, and then wash with tap water, distilled water and acetone in turn. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a preparation method of a magnesium alloy surface micro-arc oxidation/spray coating compound film, which relates to a preparation method of a magnesium alloy surface compound film. The invention solves the problems that film layers obtained by chemical composition coating, anodic oxidation and vapor deposition in the existing magnesium alloy surface treatment method are thin and have poor corrosion resistance performance, the ion injection has high cost and is difficult to realize large-area processing, the combining force between coating layers and the magnesium alloy is poor, and organic coating layers has the defect of easy aging. The preparation method has the following steps: firstly, using micro-arc oxidation for preparing ceramic films on the surface of the magnesium alloy; then, adopting air spray coating for spraying and coating inorganic paint onto the ceramic films; and then, carrying out heat treatment to obtain the micro-arc oxidation/spray coating compound film. The method is simple, and the cost is low. The air spray coating uses porous structures of the micro-arc oxidation ceramic films, so the combination of the inorganic coating layers and the ceramic films is firm, the thickness of the compound films is between 20 and 40 mum, the self corrosion electric potential is positively moved to -1.02 V, the corrosion current density is lowered by 5 orders through being compared with that of the magnesium alloy, the magnesium alloy surface micro-arc oxidation/spray coating compound film has no damage after 72 to 144h of salt spray tests, and the corrosion resistance performance is good.

Description

technical field [0001] The invention relates to a preparation method of a magnesium alloy surface composite film. Background technique [0002] Magnesium alloy is known as "the most potential and promising green engineering material in the 21st century". It has high specific strength and specific stiffness, good shock absorption and noise reduction performance, low elastic modulus, lower plasticity than aluminum, and high electromagnetic shielding. The advantages of interference performance, damping performance and good heat dissipation performance. In addition, the recovery and regeneration of magnesium alloy is good, which meets the requirements of environmental protection. In view of the above advantages, magnesium alloys are widely used in the fields of automobiles, electronic appliances, aerospace, national defense, transportation and so on. However, magnesium alloy electrodes have low potential, high chemical activity, low stability, and are prone to corrosion in hum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30B05D1/02B05D7/14
Inventor 姚忠平姜兆华吴松全齐素芳王福平
Owner HARBIN INST OF TECH
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