Method for preparing ZrO2 compound ceramic film on surfaces of magnesium and magnesium alloy through microarc oxidization

A technology of composite ceramic film and micro-arc oxidation, which is applied in anodic oxidation and other directions, can solve problems that cannot meet the needs of aerospace and aviation fields, and achieve good versatility, long service life, and improved corrosion resistance.

Inactive Publication Date: 2012-02-08
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the application of magnesium alloys in aerospace and aviation fields puts forward higher requirements for the corrosion resistance and high temperature oxidation resistance of ceramic films. Therefore, the ceramic films prepared by existing technologies can no longer meet the requirements of aerospace and aviation fields.

Method used

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  • Method for preparing ZrO2 compound ceramic film on surfaces of magnesium and magnesium alloy through microarc oxidization
  • Method for preparing ZrO2 compound ceramic film on surfaces of magnesium and magnesium alloy through microarc oxidization
  • Method for preparing ZrO2 compound ceramic film on surfaces of magnesium and magnesium alloy through microarc oxidization

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Step 1. Use water as a solvent to prepare a zirconium salt system solution. Each liter of the zirconium salt system solution contains 15g of zirconium salt, 10g of sodium hexametaphosphate, 3g of sodium silicate, 4g of sodium fluoride, 12mL of glycerin, and 8mL of ammonia water. Adjust the zirconium salt The pH value of the system solution is 7-8, and then the zirconium salt system solution is placed in the electrolytic cell for 24 hours to be used as an electrolyte; the zirconium salt is zirconium acetate;

[0029] Step 2. Place the magnesium alloy to be treated in the electrolyte described in step 1 as the anode, and the stainless steel plate as the cathode, control the temperature of the electrolyte to 10°C, and set the micro-arc oxidation power supply (DC pulse power supply) to work at a constant voltage In this method, the pulse frequency is adjusted to 600Hz, the duty cycle is 20%, and the constant voltage treatment is performed under the condition of 280V for 10 m...

Embodiment 2

[0035] The preparation method of this example is the same as that of Example 1, except that the zirconium salt is zirconium hydroxide, zirconium carbonate, ammonium zirconium fluoride or sodium zirconium silicate.

[0036] In this example, by adding Zr element in the electrolyte, the prepared magnesium alloy micro-arc oxidation ceramic film contains ZrO 2 Composite ceramics to improve the corrosion resistance of the ceramic membrane. When the prepared ceramic membrane is not subjected to post-sealing treatment, the corrosion resistance of neutral NaCl salt spray can reach more than 400h, and the microhardness can reach more than 1000HV.

Embodiment 3

[0038] Step 1. Prepare a zirconium salt system solution with water as a solvent. Each liter of the zirconium salt system solution contains 12g of zirconium salt, 12g of sodium hexametaphosphate, 5g of sodium silicate, 2g of sodium fluoride, 10mL of glycerin, and 8mL of ammonia water. Adjust the zirconium salt The pH value of the system solution is 9-10, and then the zirconium salt system solution is placed in the electrolytic cell for 20 hours to be used as an electrolyte; the zirconium salt is zirconium hydroxide;

[0039] Step 2. Put the magnesium to be treated in the electrolyte solution described in step 1 as the anode, and the stainless steel plate as the cathode, control the temperature of the electrolyte to 35°C, and set the micro-arc oxidation power supply (DC pulse power supply) as a constant voltage working mode , adjust the pulse frequency to 500Hz, and the duty cycle to 10%, and treat it at a constant voltage of 250V for 20 minutes, then increase the voltage to 400V...

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Abstract

The invention discloses a method for preparing a ZrO2 compound ceramic film on surfaces of magnesium and magnesium alloy through microarc oxidization. The method comprises the steps of: based on a zirconium salt system solution as an electrolyte, placing the magnesium or magnesium alloy in the electrolyte to be used as an anode, taking a stainless steel plate as a cathode, controlling the temperature of the electrolyte to be 10-35 DEG C, regulating the pulse frequency to be 300-1000Hz and the duty cycle to be 5-45%, carrying out constant-voltage treatment for 10-30 minutes under the condition that the voltage is 250-300V, then raising the voltage to 400-450V, and carrying out constant-voltage treatment for 20-60 minutes, thereby growing a uniform and compact ZrO2 compound ceramic film in situ on the surface of the magnesium or magnesium alloy. By adopting the method disclosed by the invention, the compact ZrO2 compound ceramic film can be rapidly obtained on the surface of the magnesium alloy. The method has no special requirements for materials, shapes, sizes and the like of the magnesium or magnesium alloy, and has better generality.

Description

technical field [0001] The invention belongs to the technical field of micro-arc oxidation treatment, and in particular relates to the preparation of ZrO by micro-arc oxidation on the surface of magnesium and magnesium alloys 2 The method of composite ceramic membrane. Background technique [0002] Magnesium alloy is an alloy with the lightest specific gravity used in modern industrial alloys. It has a high strength-to-weight ratio and good shock resistance. It is mainly used in missile guidance systems, landing hubs, engine casings and other components. In recent years, magnesium and its alloys have become an important substitute for lightweight structural materials. Magnesium alloys are also used in automotive and electronics industries that require high strength, high vibration damping, electromagnetic shielding, and good mechanical properties. Due to these excellent characteristics of magnesium, the consumption of magnesium is increasing in the world, and the developme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 陈宏郝建民郝一鸣
Owner CHANGAN UNIV
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