Method for reducing diffusion temperature of magnesium alloy surface spraying coating

A surface spraying and magnesium alloy technology, which is applied in the field of material science, can solve the problems of damaging the performance of magnesium alloy substrates, etc., and achieve the effects of increased self-corrosion potential, easy popularization and application, and simple operation

Inactive Publication Date: 2008-04-16
重庆工学院
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the sprayed aluminum coating on the surface of the magnesium alloy must undergo diffusion heat treatment to form a metallurgical bond to effectively improve the corrosion resistance. At present, the temperature of the diffusion heat treatment necessary for the formation of metallurgical bonds between magnesium and aluminum must be around 430°C. Such a high temperature will have Damage to other properties of the magnesium alloy matrix

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  • Method for reducing diffusion temperature of magnesium alloy surface spraying coating
  • Method for reducing diffusion temperature of magnesium alloy surface spraying coating
  • Method for reducing diffusion temperature of magnesium alloy surface spraying coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Surface Nano-AZ91D Cast Magnesium Alloy Surface Sprayed Aluminum Coating and Diffusion Treatment

[0024] First, the AZ91D as-cast magnesium alloy sample was roughly ground on SiC sandpaper to make the surface smooth and smooth without oil stains. It is carried out under the following conditions, the processing time is 30min, the projectile material is made of stainless steel, the diameter is 1.5mm, and the particle velocity is 180m / s. Through this treatment, the grains on the surface of the magnesium alloy are refined to nanometer size, and the scale and roughening on the surface of the magnesium alloy are removed to enhance the mechanical riveting bonding force between the coating and the substrate. The surface morphology after treatment is shown in Figure 1. It can be seen that within 100um of the surface, the difference in the color of the coating and the substrate is caused by the difference in the corrosion of the nanocrystalline coating and the substrat...

Embodiment 2

[0027] Embodiment 2: surface mechanical grinding method (SMAT) is sprayed aluminum coating and diffusion treatment to magnesium alloy surface nanometerization

[0028] First, the surface of the AZ31 wrought magnesium alloy is pretreated, and the process is the same as in Example 1. Surface mechanical grinding method (SMAT) is used to carry out surface nano-treatment on the cleaned magnesium alloy sample. The processing parameters are: stainless steel projectile, diameter 8mm, vibration frequency 20kHz, time 60min.

[0029] After the surface of the sample is nano-sized, aluminum coating is thermally sprayed on the surface. The spraying process parameters are air pressure 0.7MPa, oxygen pressure 0.5MPa, and acetylene pressure 0.05MPa. Finally, the sprayed sample is placed in an ordinary heat treatment furnace at 300 Heat preservation treatment at ℃ for 4 hours, and carry out diffusion treatment to promote the formation of metallurgical bonding between the coating and the substra...

Embodiment 3

[0031] Embodiment 3: Surface ultrasonic shot peening (UUSP) sprays aluminum coating and diffusion treatment on magnesium alloy surface

[0032] First, the surface of the AM60 wrought magnesium alloy sample is pretreated, and the process is the same as that of Example 1. Surface ultrasonic shot peening (UUSP) is used to carry out surface nano-treatment on the cleaned magnesium alloy sample. The processing parameters are: stainless steel projectiles, diameter 3mm, vibration frequency 20kHz, time 1-5min.

[0033] After the surface of the sample is nano-sized, aluminum coating is thermally sprayed on the surface. The spraying process parameters are air pressure 0.6MPa, oxygen pressure 0.5MPa, and acetylene pressure 0.06MPa. Finally, the sprayed sample is placed in an ordinary heat treatment furnace Insulation treatment at 250°C for 4 hours, diffusion treatment to promote the formation of metallurgical bonding between the coating and the substrate, and air cooling to room temperature...

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Abstract

The invention provides a method for reducing the diffusion temperature of spraying coating of magnesium alloy surface. First, nanocrystallization treatment is done on the magnesium alloy surface before the hot spray coating is done on the magnesium alloy matrix surface, which ensures the thinning of the crystal grain on the magnesium surface to the size of nanometer and eliminates the roll scale of the magnesium surface and coarsening to increase the mechanical riveted bonding force of matrix and coating; and then the magnesium alloy surface is hot sprayed by aluminum or zinc or a zinc/aluminium complex coating; finally, the magnesium alloy is treated to preserve heat in an ordinary heat treatment furnace at a temperature of 200 to 400 degrees, which facilitates the coating and the matrix to form metallurgical bonding. The invention adopts the surface nanocrystallization technique, which can not only reduce the diffusion temperature of spraying coating of magnesium alloy surface, but also avoid the necessary sand blasting pretreatment technology before spray finishing. In addition, special processing step is not needed, which eliminates the roll scale of the matrix surface and coarsening surface and ensures that a layer of nanocrystal is formed on the magnesium alloy matrix surface, thereby saving the processing time before spray finishing and raising the productivity effect.

Description

technical field [0001] The invention relates to a metal surface nanometerization and coating diffusion heat treatment technology, in particular to the technology of spraying aluminum on the surface of a magnesium alloy, spraying zinc and reducing the diffusion temperature of the zinc-aluminum coating, and belongs to the field of material science. Background technique [0002] Magnesium alloys have poor corrosion resistance, and various coatings have been used to protect the magnesium alloy substrate from corrosion by corrosive media. At present, anodic oxidation treatment, chemical conversion treatment, electroplating, epoxy resin sealing, paint, enamel, etc. are commonly used. The coatings of these surface treatments are thin, and the corrosion resistance is limited to a certain extent. Both electroplating and anodizing are limited by the size of the equipment and Eliminate the problem of waste liquid. Therefore, countries around the world have successively carried out res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/02C23C4/18C22F1/06
Inventor 张津欧信兵麻彦龙王莹杨栋华龚喜兵
Owner 重庆工学院
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