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Magnesium-aluminium bimetal composite pipe/bar

A bimetallic composite pipe and magnesium alloy pipe technology, which is applied in metal extrusion, metal extrusion dies, metal processing equipment, etc., can solve the problems of poor corrosion resistance and other problems

Inactive Publication Date: 2006-10-25
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of poor corrosion resistance of existing magnesium alloy tubes / rods, the present invention proposes a magnesium-aluminum bimetallic composite tube / rod to improve the corrosion resistance of magnesium alloy tubes / rods

Method used

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  • Magnesium-aluminium bimetal composite pipe/bar
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: Extrusion example of magnesium-aluminum bimetal composite rod:

[0015] The mold is a cone mold with a cone angle of 150°. The 82×6 (outer diameter is 82, wall thickness is 6) 6063 aluminum alloy tube blanks are machined into 82×4 tube blanks with a length of 250 mm, and the 80 AZ31B magnesium alloy round ingots are processed into lengths It is a 74 round ingot of 250mm. The aluminum alloy tube blank is cleaned with lye, and then pickled, while the magnesium alloy round ingot is pickled. After drying, put the magnesium alloy round ingot into the aluminum alloy tube billet to become a combined ingot. Put the combined ingot into the furnace and heat it to 380°C and keep it warm for 3 hours. The heating temperature of the extrusion cylinder, mold and extrusion pad is 380°C. The extrusion speed was 0.5 m / min. Extrude 16 magnesium-aluminum composite rods. Finally, it is straightened, cut to length, packed and put into storage.

[0016] Gained magnesi...

Embodiment 2

[0017] Embodiment 2: Magnesium-aluminum bimetal composite rod extruded example:

[0018] The mold is a cone mold with a cone angle of 90°. The 82×6 (outer diameter is 82, wall thickness is 6) 6063 aluminum alloy tube blanks are machined into 82×4 tube blanks with a length of 250 mm, and the 80 AZ31B magnesium alloy round ingots are processed into lengths It is a 74 round ingot of 250mm. The aluminum alloy tube blank is cleaned with lye, and then pickled, while the magnesium alloy round ingot is pickled. After drying, put the magnesium alloy round ingot into the aluminum alloy tube billet to become a combined ingot. Put the combined ingot into the furnace and heat it to 320°C and keep it warm for 4 hours. The heating temperature of the extrusion cylinder, mold and extrusion pad is 320°C. The extrusion speed was 2.0 m / min. Extrude 16 magnesium-aluminum composite rods. Finally, it is straightened, cut to length, packed and put into storage.

Embodiment 3

[0019] Embodiment 3: Extrusion example of magnesium-aluminum bimetallic composite pipe:

[0020] The extruder is equipped with extruding needles, and the die is a cone die with a cone angle of 120°. The aluminum alloy and magnesium alloy blanks are obtained by machining, the length is 250mm, the size of the outer aluminum alloy tube blank is 82×4 (outer diameter is 82, the wall thickness is 4), the middle layer magnesium alloy tube blank size is 74×25, The size of the inner aluminum alloy tube blank is 24×4. The aluminum alloy tube blank is cleaned with lye, and then pickled, while the magnesium alloy tube blank is pickled. After drying, assemble the combined ingot according to the order of aluminum alloy and magnesium alloy in the finished product. Put the combined ingot into the furnace and heat it to 350°C and keep it warm for 4 hours. The heating temperature of the extrusion cylinder is 350°C. Then the extrusion speed was 1 m / min. Extrude a 22×3 magnesium-aluminum ...

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Abstract

The present invention relates to a kind of magnesium aluminium bimetal composite pipe / rod material. It is formed from interior magnesium alloy pipe / rod material and aluminium alloy layer covering surface of said interior magnesium alloy pipe / rod material. Its processing process includes the following steps: utilizing aluminium alloy and magnesium alloy to prepare combined ingot, heating said combined ingot and heat-insulating, extruding and straightening so as to obtain the invented product. Its extruding ratio is greater than 10, heating temperature is 300-400 deg.C, heat-insulating time is 1-5h and extruding speed is 0.5-3m / min.

Description

technical field [0001] The invention belongs to the field of plastic processing of nonferrous metals, and relates to a magnesium-aluminum bimetal composite pipe / rod. Background technique [0002] The density of magnesium is small (1.74g / cm 3 ), is the lightest metal material in structural materials, and the magnesium alloy made of it has the advantages of low density, high specific strength and high specific stiffness; in addition, the elastic modulus of magnesium alloy is low, about 45000MPa, and the vibration damping property is good , can withstand large vibration loads. However, the equilibrium potential of magnesium is relatively negative (-2.34V), and the potential in common media is also very low. In addition, the oxide film of magnesium is loose (φ=0.79), which is not as dense and protective as aluminum oxide film, so The poor corrosion resistance of magnesium alloys hinders the use of magnesium alloys, making the excellent performance of ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/22B21C25/02B21C31/00B21C35/03F16L9/18
Inventor 黄光胜黄光杰徐伟潘复生汪凌云
Owner CHONGQING UNIV
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