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Magnesium alloy surface treatment method utilizing combination of laser beams and coated layer

A surface treatment, magnesium alloy technology, applied in coating, metal material coating process, fusion spraying, etc., can solve the problem of poor corrosion resistance of magnesium alloy surface, improve corrosion resistance, overcome low bonding strength Effect

Inactive Publication Date: 2017-06-13
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems existing in the above-mentioned prior art, the object of the present invention is to provide a kind of preparation method of the magnesium alloy surface corrosion-resistant layer that adopts laser beam and coating to combine, solve the problem that the magnesium alloy surface corrosion resistance is poor, Can obtain magnesium alloy anti-corrosion layer with good surface integrity and good adhesion

Method used

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  • Magnesium alloy surface treatment method utilizing combination of laser beams and coated layer
  • Magnesium alloy surface treatment method utilizing combination of laser beams and coated layer
  • Magnesium alloy surface treatment method utilizing combination of laser beams and coated layer

Examples

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Effect test

Embodiment 1

[0023] First, the AZ91D magnesium alloy sample is cleaned and polished, and then Al+Al with a thickness of 1mm is preset on the surface of the sample. 2 o 3 The mixed powder with a mass ratio of 6:1 is laser cladding with a 500W YAG solid-state pulse laser. The cladding process is protected by argon gas, and an anti-oxidation transition layer is obtained on the surface of the magnesium alloy sample.

[0024] Then use plasma spraying (one of the thermal spraying methods) to prepare Al 2 o 3 For protective coating, the power is 35KW, the spraying distance is 100mm, the powder feeding speed is 45g / min, and the thickness of the sprayed coating is about 500μm.

[0025] Finally, laser remelting is used to seal the coating. Before sealing, the magnesium alloy substrate is preheated (preheated at 100°C for 36 hours), and then remelted with a laser with a power of 2500W.

[0026] The macroscopic morphology of the prepared magnesium alloy samples after soaking in salt solution for 48...

Embodiment 2

[0028] The difference from Example 1 is that the anti-oxidation transition layer adopts Al and Al with a mass ratio of 4:1 2 o 3 mixed powder. The mixed powder in the above ratio is used as the anti-oxidation transition layer cladding material, because Al 2 o 3 The addition of reinforcement phase particles significantly improves the surface hardness and wear resistance of the magnesium alloy after cladding (the microhardness is 258HV, and the substrate hardness of the magnesium alloy before cladding is 80HV). If you continue to increase the Al in the mixed powder 2 o 3 content, the surface hardness of the cladding layer increases less, and due to Al 2 o 3 Large difference in physical properties between magnesium alloys, excessive Al 2 o 3 It is easy to cause microcracks, affect the quality of the cladding layer, and seriously reduce the corrosion resistance of the anti-oxidation transition layer.

Embodiment 3

[0030] The difference from Example 1 is that the anti-oxidation transition layer adopts Al and Al with a mass ratio of 8:1 2 o 3 mixed powder. At this time, the Al content in the cladding material is relatively high (Al 2 o 3 The content is relatively small), and the surface hardness of the sample reaches 160HV after cladding.

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Abstract

The invention discloses a magnesium alloy surface treatment method utilizing combination of laser beams and a coated layer. The surface treatment method comprises the following steps that (1) a laser cladding method is adopted, and an oxidation resistance transition layer is prepared on the surface of a magnesium alloy; (2) a thermal spraying method is adopted, and a protective coating is prepared on the oxidation resistance transition layer; and (3) a laser re-melting method is adopted, and the protective coating is subjected to hole sealing treatment. The magnesium alloy surface treatment method is universally suitable for preparation of a magnesium alloy corrosion resistance layer, through the oxidation resistance transition layer, the protective coating and hole sealing of the protective coating, a magnesium alloy base material is subjected to multi-way protection, penetrability passageway corrosion defects existing in a single corrosion resistance layer can be effectively cut off, and corrosion resistance of a magnesium alloy material is greatly improved.

Description

technical field [0001] The invention belongs to the field of metal surface treatment, in particular to a magnesium alloy surface treatment method in which a laser beam is combined with a coating layer. Background technique [0002] Magnesium alloy is the lightest metal structure material, which has the characteristics of low density, high specific strength, high specific stiffness, good damping, good thermal and electrical conductivity, and excellent electromagnetic shielding properties. It has been widely used in aerospace, automotive and electronic communication industries. Wide range of applications. However, magnesium is the metal with the most negative potential among the practical metals, and the standard potential is -2.34V (relative to the standard hydrogen electrode). When the magnesium alloy contains certain metal impurity elements (such as Fe, Ni, Cu, etc.), it is extremely It is easy to cause electrochemical corrosion; magnesium is very easy to oxidize, and a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C24/10C23C4/11C23C4/18
CPCC23C4/18C23C24/103C23C28/324C23C28/345
Inventor 尚凯文王瑞崔向中吴敢杨建平曹生珠周晖何延春
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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