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Composite treatment process for manufacturing anti-corrosion protective layer on surface of cast aluminum alloy

A technology of casting aluminum alloy and composite treatment, which is applied in the direction of metal material coating process, manufacturing tools, casting molding equipment, etc., can solve the problems of complex second phase of casting aluminum alloy, unsuitable for casting aluminum alloy, serious environmental problems, etc. Achieve the effects of improved corrosion resistance, improved polarization resistance, and good durability

Active Publication Date: 2020-07-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing aluminum alloy surface treatment processes, such as anodic oxidation, micro-arc oxidation, and laser cladding, have been widely used in the field of aluminum alloy profile surface treatment, but their cost is high, environmental problems are serious, and because cast aluminum alloy has complex Second phase, none of these methods are suitable for cast aluminum alloys

Method used

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  • Composite treatment process for manufacturing anti-corrosion protective layer on surface of cast aluminum alloy
  • Composite treatment process for manufacturing anti-corrosion protective layer on surface of cast aluminum alloy
  • Composite treatment process for manufacturing anti-corrosion protective layer on surface of cast aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) According to 60 parts of aggregate, 32.4 parts of Na 2 Cr 2 o 7 2H2 O, 6.3 parts of molten salt, 2.2 parts of binder, 0.1 part of suspending agent Weigh the raw materials, add pure water and ball mill for 1 hour to make a coating; the aggregate is Fe 2 o 3 , and is a powder that can pass through a 320 mesh sieve.

[0038] (2) Coating the above-mentioned coating on the inner cavity of the mold or the surface of the sand core, and drying at a temperature of 120-140°C;

[0039] (3) Pour the smelted aluminum liquid into the above-mentioned casting mold, and the aluminum liquid interacts with the coating on the surface of the mold cavity or the surface of the sand core, and the oxide layer is formed on the surface of the casting.

[0040] (4) 10 parts by weight of Al(H 2 PO 4 ) 3 , 80 parts of pure water and Al(H 2 PO 4 ) 3 1.1 times the amount of Al required for all chemical reactions 2 o 3 Weigh raw materials as powder, mix and stir evenly to obtain phospha...

Embodiment 2

[0044] (1) According to 67 parts of aggregate, 25.4 parts of Na 2 Cr 2 o 7 2H 2 O, 6 parts of molten salt, 1.6 parts of binder, 0.1 part of suspending agent Weigh the raw materials, add pure water and ball mill for 1 hour to make a coating; the aggregate is SiO 2 and Cr 2 o 3 mixture, and is a powder that can pass through a 320 mesh sieve.

[0045] (2) Coating the above-mentioned coating on the inner cavity of the mold or the surface of the sand core, and drying at a temperature of 120-140°C;

[0046] (3) Pour the smelted aluminum liquid into the above-mentioned casting mold, and the aluminum liquid interacts with the coating on the surface of the mold cavity or the surface of the sand core, and the oxide layer is formed on the surface of the casting.

[0047] (4) 70 parts by weight of Al(H 2 PO 4 ) 3 , 40 parts of pure water and Al(H 2 PO 4 ) 3 1.3 times the amount of Al needed for all chemical reactions 2 o 3 Weigh raw materials as powder, mix and stir evenly t...

Embodiment 3

[0051] (1) According to 80 parts of aggregate, 7.4 parts of Na 2 Cr 2 o 7 2H 2 O, 9 parts of molten salt, 3.5 parts of binder, 0.1 part of suspending agent weigh raw materials, add pure water and ball mill for 1 hour to make a coating; the aggregate is spinel, and it is a powder that can pass through a 320 mesh sieve.

[0052] (2) Coating the above-mentioned coating on the inner cavity of the mold or the surface of the sand core, and drying at a temperature of 120-140°C;

[0053] (3) Pour the smelted aluminum liquid into the above-mentioned casting mold, and the aluminum liquid interacts with the coating on the surface of the mold cavity or the surface of the sand core, and the oxide layer is formed on the surface of the casting.

[0054] (4) 40 parts by weight of Al(H 2 PO 4 ) 3 , 60 parts of pure water and Al(H 2 PO 4 ) 3 1.2 times the amount of Al needed for all chemical reactions 2 o 3 Weigh raw materials as powder, mix and stir evenly to obtain phosphate coatin...

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Abstract

The invention discloses a composite treatment process for manufacturing an anti-corrosion protective layer on the surface of a cast aluminum alloy. The composite treatment process includes the following steps that 1, an aluminum alloy casting is produced through an intra-model oxidation process; and 2, the aluminum alloy casting obtained after intra-model oxidation treatment in the step 1 is subjected to heat treatment, and then steam-assisted phosphate coating treatment is carried out. As for the aluminum alloy workpiece manufactured through the intra-model oxidation treatment process, afterheat treatment, a steam-assisted phosphate coating treatment process is adopted for reinforcing treatment, the corrosion resistance of the aluminum alloy casting can be remarkably improved, and the service life of the casting is prolonged.

Description

technical field [0001] The invention relates to a composite treatment process for manufacturing a corrosion-resistant protective layer on the surface of a cast aluminum alloy, and belongs to the technical field of surface treatment of the cast aluminum alloy. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal material in industrial production. Because of its high specific strength, high specific stiffness, excellent electrical and thermal conductivity, and good machinability, it is widely used in automotive, aerospace, shipbuilding and other industrial fields. widely used. [0003] The chemical properties of aluminum and aluminum alloys are relatively active, and their standard electrode potential is -1.66V (25°C). Among all commonly used metal materials, the electrode potential is lower and the properties are more active. Aluminum and aluminum alloys can undergo hydrogen evolution corrosion in all pH ranges, and corrode in acidic corrosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/18B22C3/00C23C22/05C23C22/73C22F1/04
CPCB22C3/00B22D27/18C22F1/04C23C22/05C23C22/73
Inventor 董寅生王德洋余亮郭超黄志海储成林盛晓波
Owner SOUTHEAST UNIV