Preparation method and hole sealing method of magnesium alloy surface ceramic coating

A ceramic film layer and magnesium alloy technology, applied in anodic oxidation, etc., can solve the problems of magnesium alloy surface corrosion, poor high temperature resistance, high equipment requirements, etc., achieve good corrosion resistance, good film compactness, and low production cost Effect

Active Publication Date: 2015-05-27
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of vacuum impregnation can effectively make the impregnating agent penetrate into the pores of the micro-arc oxidation membrane, but the organic monomer is used as the sealing agent, and the high temperature resistance is poor.
Chinese patent 201110288402.2 proposes a mixture of organosilicon stock solution and alcohol with a mass concentration of more than 95% in a mass ratio of 5:1 to 10:1 as a sealing agent, and first decontaminates the micro-arc oxidation film layer of aluminum alloy with acetone Degreasing, then cleaning with 50℃~60℃ distilled water by ultrasonic vibration, then put the aluminum alloy micro-arc oxidation sample into the pressure vessel, seal and vacuumize, then inject the sealing agent to submerge the sample, then release the vacuum, and then put the The sample is placed in a holding furnace and held at 120°C to 150°C for 15 to 30 minutes. This process requires pressurization, requires high equipment, and the process is relatively complicated. The alcohol in the impregnation solution is volatile
[0006] In view of the above situation, it is necessary to develop a simple and feasible magnesium alloy ceramic film layer and sealing method to solve the problem of corrosion protection on the surface of magnesium alloy

Method used

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  • Preparation method and hole sealing method of magnesium alloy surface ceramic coating
  • Preparation method and hole sealing method of magnesium alloy surface ceramic coating
  • Preparation method and hole sealing method of magnesium alloy surface ceramic coating

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The workpiece to be processed is a magnesium alloy AM80 plate, the size is 100mm×75mm×10mm, and it is hung at 10% (W / W) HNO 3 Soak in the solution for 1 minute, take it out and wash it with water, put it in the oxidation tank as the anode, and the electrolyte composition is: PO 4 3- 0.2mol / l, F - 0.2mol / l, NH 4 + 0.95mol / l, Na + 0.1mol / l, triethanolamine 0.3mol / l; power supply adopts DC waveform, set oxidation current to 3A, frequency to 50Hz, duty cycle to 30%, temperature to 15°C, under compressed air stirring, oxidation time to 10 minutes, voltage to 400V, oxidation After finishing, take out the workpiece, rinse it with clean water, and soak it in hot water at 60°C for 5 minutes; dry it with compressed air, and then place the workpiece in a container filled with nano-SiO 2 In the vacuum container of the ceramic sealing liquid, the dispersant of the sealing liquid is isopropanol, with a solid content of 25% (mass percentage), vacuumize until there are no bubb...

Embodiment 2

[0029]The workpiece to be processed is a magnesium alloy ZK80 plate with a size of 100mm×75mm×10mm. The surface is sandblasted with 220 mesh glass sand, washed with water after hanging up, and placed in an oxidation tank as an anode. The electrolyte composition is: PO 4 3- 0.15mol / l, F - 0.25mol / l, NH 4+ 0.95mol / l, Na + 0.1mol / l, triethanolamine 0.3mol / l, urotropine 0.15mol / l; the power supply adopts a single pulse waveform, the oxidation current is set to 3A, the duty cycle is 50%, the frequency is 200Hz, the temperature is 20℃, under the stirring of compressed air , the oxidation time is 10 minutes, and the oxidation voltage is 390V. After the oxidation, the workpiece is taken out, rinsed with clean water, and the surface moisture is dried with compressed air; then the workpiece is suspended in a container filled with nano-SiO 2 In the vacuum container of the ceramic sealing liquid, the dispersant of the sealing liquid is polyethylene glycol, with a solid content of 2...

Embodiment 3

[0032] The workpiece to be processed is a magnesium alloy Az91 die casting with a surface area of ​​5dm 2 , the surface is sandblasted with 220-mesh glass sand, washed with water after being hung up, placed in an oxidation tank as an anode, and the electrolyte composition is: PO 4 3- 0.2mol / l, NH 4 + 0.95mol / l, triethanolamine 0.25mol / l, glycerin 0.1mol / l; the power supply adopts DC waveform, the oxidation current is set to 4A, the frequency is 1000Hz, the duty cycle is 40%, the temperature is 20°C, the oxidation time is 5 under compressed air stirring Minutes, voltage 380V, take out the workpiece after oxidation, rinse with clean water, soak in hot water at 60°C for 5 minutes; blow dry with compressed air, and then place the workpiece in a container filled with nano-SiO 2 In the vacuum container of the ceramic sealing liquid, the dispersant of the sealing liquid is isopropanol, the solid content is 20% (mass percentage), vacuumize until no bubbles emerge from the sealing...

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Abstract

The invention discloses a preparation and hole sealing method of a magnesium alloy surface ceramic coating. The method comprises the steps of preparing an electrolyte containing 0.15-0.25mol/l of anion PO4<3->, 0-0.5mol/l of F<->, 0.75-1.2mol/l of cation NH4<+>, 0-0.4mol/l of K<+> or Na<+> and 0.25-0.5mol/l of a stabilizer; and selecting a magnesium alloy workpiece as an anode, selecting a stainless steel plate as a cathode, and performing arc-free oxidation by adopting direct current or pulse current to obtain the ceramic coating. The magnesium alloy workpiece is oxidized by adopting an arc-free oxidation method, so that the surface of the coating is smooth, the film forming speed is high, the compactness of the coating is good, the corrosion resistance is greatly improved, and the preparation cost is relatively low; by adopting nano SiO2 dispersion as a hole sealing agent and combining a vacuum impregnation technology, the hole-sealed ceramic coating has good corrosion, abrasion, heat and pollution resistance and the like and is simple in process and easy to operate, the corrosion protection performance of the magnesium alloy surface is effectively improved, meanwhile, the hole sealing technology can also be applied to hole sealing treatment of light alloy micro-arc oxidation coatings, hot spray coatings and plated coatings of aluminum and titanium.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, in particular to a method for preparing a ceramic film layer on the surface of a magnesium alloy material by adopting an arc-suppressed oxidation method and performing hole sealing treatment on the ceramic film layer. Background technique [0002] Magnesium alloy is the lightest metal structure material in practical application (its density is 1 / 4 of steel and 2 / 3 of aluminum alloy), it has light specific gravity, high specific strength and specific stiffness, strong damping and shock absorption performance, and thermal conductivity Good, good impact resistance, strong electromagnetic shielding ability and easy recycling. As a new generation of green, high-strength, and lightweight metal structural materials, magnesium alloys have some advantages that other materials cannot match in the fields of automotive industry, aerospace, weaponry, computers, communication products...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
CPCC25D11/30
Inventor 鲁闯朱利萍杨润田王志锋唐纬虹贺勇
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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