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A kind of corrosion-resistant aluminum alloy and preparation method thereof

A corrosion-resistant aluminum alloy and aluminum alloy technology, applied in metal material coating process, coating, fusion spraying, etc., can solve problems such as intergranular corrosion of aluminum alloy, damage of structural parts, reduction of material strength plasticity and fatigue performance, etc. , to achieve the effect of improving corrosion resistance, enhancing mechanical properties, and reducing weight burden

Active Publication Date: 2020-10-16
贵州航天风华精密设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This layer of protective film has a certain self-healing ability, but in the marine atmospheric environment, due to the presence of chloride ions and sulfate ions, the naturally generated aluminum oxide passivation film is easily damaged, so the aluminum alloy in the marine atmosphere The atmospheric environment is not stable. Aircraft flying in coastal areas will cause intergranular corrosion, exfoliation and stress corrosion of aluminum alloy due to the action of humid air and industrial waste gas.
Because intergranular corrosion occurs inside the metal, it is often not easy to be found, causing sudden damage to structural parts; denudation leads to a substantial decrease in the strength, plasticity and fatigue properties of the material; once stress corrosion occurs, it will cause disastrous consequences.
[0003] The application number is CN201710925578.1, which discloses the preparation process of corrosion-resistant aluminum alloy materials and corrosion-resistant aluminum alloy materials. During the production process, silicon nitride, borax, aluminum, copper, and diatomaceous earth are melted, and molybdenum is added after melting Iron, manganese, yttrium, titanium, chromium, nickel, add regulator, dispersant, p-hydroxybenzenesulfonic acid, reinforcing agent to refine the alloy after chemical purification, add Al-Si-Re composite fine powder to disperse during the refining process On the surface of the alloy, then cast the alloy and press the film to correct the value to obtain the alloy with strong corrosion resistance. The dispersed composite fine powder may have the problem of loose connection between the alloy layer and the alloy layer during the casting process.

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  • A kind of corrosion-resistant aluminum alloy and preparation method thereof

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Effect test

Embodiment 1

[0019] The aluminum alloy is the aluminum alloy body;

[0020] Raw materials: 16 parts of iron, 2.5 parts of zinc, 10 parts of copper, 72 parts of aluminum material;

[0021] Processing method: first weigh the raw materials according to the proportion, wash the aluminum material with iron, zinc and copper, put it into the drying box, take it out after drying, and melt the aluminum alloy aqueous solution at a high temperature of 600-700°C; when the temperature of the aluminum alloy liquid is 700- At 750°C, add a degassing and slag removal agent to the aluminum alloy liquid, sprinkle it evenly on the surface of the aluminum alloy liquid, and then inject the molten liquid into the preheated mold cavity through the casting machine for die-casting;

[0022] Further, after the addition of the degassing and slag removal agent, the residue filtering operation is performed every 30-35 minutes, and the number of residue filtering is not less than five times;

[0023] Further, when the ...

Embodiment 2

[0025] The aluminum alloy is the aluminum alloy body;

[0026] Alloy raw materials: 1.5 parts carbon, 4 parts chromium, 2 parts manganese, 16 parts iron, 2.5 parts zinc, 10 parts copper, 72 parts aluminum;

[0027] Processing method: (1) Firstly weigh the raw materials according to the proportion, wash the aluminum material with iron, zinc and copper, put it into the drying box, take it out after drying, melt the aluminum alloy aqueous solution at a high temperature of 600-700°C, and set aside; (2 ) Put carbon, chromium, manganese, and nickel raw materials into the smelting furnace, preheat and keep warm at 400-500°C for 3-6h, until the raw materials in the smelting furnace are in a molten state and form a mixed molten liquid; (3) put (1 ) and continue to heat up the melted aluminum alloy liquid. When the temperature of the aluminum alloy liquid rises to 700-750°C, add a degassing and slag-removing agent to the aluminum alloy liquid, and sprinkle it evenly on the surface of th...

Embodiment 3

[0031] The aluminum alloy consists of two parts: the aluminum alloy body and the corrosion-resistant layer on the surface of the aluminum alloy;

[0032] Alloy raw materials: 1.5 parts carbon, 4 parts chromium, 2 parts manganese, 16 parts iron, 2.5 parts zinc, 10 parts copper, 72 parts aluminum;

[0033] Anti-corrosion layer raw materials: 35 parts of aluminum, 6 parts of magnesium, 3 parts of rhenium, 4 parts of silicon, 17 parts of rare earth elements, and 14 parts of modified graphene oxide;

[0034] Alloy processing method: (1) Firstly weigh the raw materials according to the proportion, wash the aluminum material with iron, zinc and copper, put it into the drying box, take it out after drying, melt the aluminum alloy aqueous solution at a high temperature of 600-700°C, and set aside; ( 2) Put carbon, chromium, manganese, and nickel raw materials into the smelting furnace, preheat and keep warm at 400-500°C for 3-6h, until the raw materials in the smelting furnace are in a...

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Abstract

The invention relates to the field of aluminum alloy processing and in particular relates to a corrosion-resistant aluminum alloy and a preparation method thereof. The aluminum alloy comprises two parts, namely an aluminum alloy body, and a corrosion-resistant layer on the surface of the aluminum alloy, wherein the aluminum alloy body comprises the following components in parts by weight: 1-2 parts of carbon, 3-5 parts of chromium, 1-3 parts of manganese, 18-24 parts of iron, 2-3 parts of zinc, 1-15 parts of copper, 4-6 parts of nickel and 70-75 parts of aluminum; the corrosion-resistant layeron the surface of the aluminum alloy comprises the following components in parts by weight: 30-40 parts of aluminum, 5-7 parts of magnesium, 2-4 parts of rhenium, 3-5 parts of silicon, 10-23 parts ofrare-earth elements and 10-15 parts of modified graphene oxide. The ductility of the aluminum alloy is improved by the alloy adjusting composition, and elements such as the silicon, manganese and thelike are increased, so that the hardness of the aluminum alloy can be effectively improved, and the mechanical properties of aluminum alloy plates are enhanced. Moreover, the processed aluminum alloyis light in weight, and the weight burden in the application process is reduced.

Description

technical field [0001] The invention relates to the field of aluminum alloy processing, in particular to a corrosion-resistant aluminum alloy and a preparation method thereof. Background technique [0002] Aluminum and aluminum alloys are chemically active, and their equilibrium electrode potential is about -1.67V. The reason why they are resistant to corrosion is that a layer of aluminum oxide passivation film can be formed on the surface. This layer of protective film has a certain self-healing ability, but in the marine atmospheric environment, due to the presence of chloride ions and sulfate ions, the naturally generated aluminum oxide passivation film is easily damaged, so the aluminum alloy in the marine atmosphere The atmospheric environment is not stable. Aircraft flying in coastal areas will cause intergranular corrosion, exfoliation and stress corrosion of aluminum alloy due to the action of humid air and industrial waste gas. Since intergranular corrosion occurs ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/02C23C4/131C23C4/067C22C1/06
CPCC22C1/026C22C1/06C22C21/00C23C4/067C23C4/131
Inventor 陈寅
Owner 贵州航天风华精密设备有限公司