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Magnesium alloy surface pretreatment method

A surface pretreatment, magnesium alloy technology, applied in metal material coating process, fusion spraying, coating, etc., can solve the problem that the bonding performance needs to be further improved, to prevent falling off, increase roughness, and eliminate microcracks Effect

Active Publication Date: 2012-06-20
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above test has successfully achieved the preparation of aluminum spray coating on the surface of magnesium alloy, but the bonding performance needs to be further improved

Method used

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  • Magnesium alloy surface pretreatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (a) Flattening treatment of the end face of magnesium alloy round ingot. The end face of the magnesium alloy round ingot is machined, and the roughness Ra is required to be 3.2.

[0023] (b) Wipe off the grease on the end surface of the magnesium alloy round ingot treated in (a) with acetone, use a V-shaped turning tool with a of 60° to process the concentric V-shaped groove on the end surface, and grind the sharp corners of the turning tools to avoid sharp corner processing . The groove depth H is 1 mm, and the distance d between centers of the concentric V-shaped grooves is 1.95 mm. See figure 1 and figure 2 as shown,

[0024] (c) Carry out magnesium swarf removal to the V-shaped groove machined by step (b), and carry out surface blasting treatment immediately after wiping clean with acetone. Quartz sand is used as the abrasive, the particle size is 20 mesh, the distance from the sandblasting nozzle to the blasting surface is 100mm, and the axis of the spray gun...

Embodiment 2

[0030] (a) Flattening treatment of the end face of magnesium alloy round ingot. The end face of the magnesium alloy round ingot is machined, and the roughness Ra is required to be 6.4.

[0031] (a) Wipe off the grease on the end surface of the magnesium alloy round ingot treated in (a) with acetone, use a 55° V-shaped turning tool to process the concentric V-shaped groove on the end surface, and round the sharp corners of the turning tool to avoid sharp corner processing. The groove depth is 1.5mm, and the center distance of concentric V-shaped grooves is 2.53mm.

[0032] (b) Carry out magnesium swarf removal to the V-shaped groove machined by step (b), and carry out surface blasting treatment immediately after wiping clean with acetone. Quartz sand is used as the abrasive, the particle size is 20 mesh, the distance from the sandblasting nozzle to the blasting surface is 150mm, and the axis of the spray gun forms an angle of 75° with the surface.

[0033] (c) After step (c),...

Embodiment 3

[0038] (a) Flattening treatment of the end face of magnesium alloy round ingot. The end face of the magnesium alloy round ingot is machined, and the roughness Ra is required to be 3.2.

[0039] (b) Clean the grease on the end surface of the magnesium alloy round ingot treated in (a) with acetone, use a 65° V-shaped turning tool to process the concentric V-shaped groove on the end surface, and round the sharp corners of the turning tool to avoid sharp corner processing. The depth of the groove is 2mm, and the distance between centers of the concentric V-shaped grooves is 2.81mm.

[0040] (c) Carry out magnesium swarf removal to the V-shaped groove machined by step (b), and carry out surface blasting treatment immediately after wiping clean with acetone. Quartz sand is used as the abrasive, the particle size is 30 mesh, the distance from the sandblasting nozzle to the blasting surface is 200mm, and the axis of the spray gun forms an angle of 85° with the surface.

[0041] (d) ...

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Abstract

A magnesium alloy surface pretreatment method is characterized by including step one, leveling; step two, groove turning; step three, shot blasting; step four, shot clearing; and step five, aluminum spraying. Compared with the prior art, the magnesium alloy surface pretreatment method has the advantages that composite coarsening treatments of shot blasting and groove turning are carried out through a joint interface so that roughness of the joint interface is enhanced and adhesion between a coating and a base can be increased; coating stress can be reduced under groove turning, microcracks inside the coating and at the contact interface of the coating and the base are eliminated, and coating shedding is prevented.

Description

technical field [0001] The invention relates to a magnesium alloy surface treatment method. Background technique [0002] Magnesium alloy has the lowest density among all structural metals and alloy materials because of its excellent comprehensive properties such as low density, high specific strength and high specific stiffness, and good electromagnetic shielding effect. It is also the first choice for energy saving, emission reduction and product lightweight. Structural materials. The application of magnesium alloy is more and more extensive, but the poor corrosion resistance of magnesium alloy has become the technical bottleneck of its engineering application, so solving the anticorrosion problem of magnesium alloy has become the key to its engineering application. [0003] Due to the loose structure of magnesium oxide (MgO) with a PBR of 0.84 formed on the surface of the magnesium alloy, an effective stable protective film cannot be formed. On the surface of the alumin...

Claims

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Application Information

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IPC IPC(8): C23C4/02C23C4/08
Inventor 陈刚陈伟辛海鹰刘红伟马力章国伟苏辉冯胜强翟景郭安振秦占明张立君
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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