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A method for treating yellowing of aluminum alloy ingot surface

A technology for ingot surface yellowing and aluminum alloy, which is applied in the field of aluminum alloy casting, can solve problems such as surface defects, affecting the appearance and processing quality of aluminum alloy ingots, and yellowing of aluminum alloy surface, so as to reduce impurities, strong hygroscopicity, Effect of reducing gas content

Active Publication Date: 2021-10-12
保定隆达铝业有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the field of aluminum alloy casting, various defects are often formed on the surface of aluminum alloy during ingot casting. For example, when the aluminum alloy ingot is cooled after casting, due to the active chemical properties of aluminum, chemical reactions easily occur on the surface of the aluminum alloy ingot, thereby Make the surface of the aluminum alloy turn yellow, cause surface defects, and affect the appearance and processing quality of the aluminum alloy ingot

Method used

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  • A method for treating yellowing of aluminum alloy ingot surface
  • A method for treating yellowing of aluminum alloy ingot surface

Examples

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Effect test

Embodiment 1

[0032] Aluminum alloy is AlSi9Cu3 (Fe) aluminum alloy in the present embodiment

[0033] (1) Preparation of aluminum alloy melt:

[0034] Mix and melt the 5182 aluminum alloy raw materials, add 0.5% hexachloroethane of the total weight of the aluminum alloy raw materials, stir once every 15 minutes after adding the hexachloroethane, and stir for a total of 4 times; keep the melting temperature constant, and pass in Ar gas, The rate of feeding Ar gas is 0.2m 3 / min, refining for 10min, covered with flux to obtain aluminum alloy melt;

[0035] Wherein, flux is by the KCl of 50% by mass percentage, the NaCl of 25% and the NaCl of 25% 3 AlF 6 composition;

[0036] (2) Cast aluminum alloy ingot:

[0037] Keeping the temperature of the molten state constant, add a mixture of 0.08% of the total weight of the aluminum alloy raw material sodium fluoride, 0.6% of the total weight of the aluminum alloy raw material and a mixture of nickel chloride and copper chloride, wherein nickel...

Embodiment 2

[0039] Aluminum alloy is ADC12 aluminum alloy in the present embodiment

[0040] (1) Preparation of aluminum alloy melt:

[0041] Mix and melt the 5083 aluminum alloy raw materials, add hexachloroethane with 1% of the total weight of the aluminum alloy raw materials, stir once every 5 minutes after adding the hexachloroethane, and stir for a total of 3 times; keep the melting temperature constant, pass in Ar gas, The rate of feeding Ar gas is 0.18m 3 / min, refining for 8min, covered with flux to obtain aluminum alloy melt;

[0042] Wherein, flux is by the KCl of 50% by mass percentage, the NaCl of 25% and the NaCl of 25% 3 AlF 6 composition;

[0043] (2) Cast aluminum alloy ingot:

[0044] Keeping the temperature of the molten state constant, add a mixture of 0.07% of the total weight of aluminum alloy raw materials sodium fluoride, 0.5% of the total weight of aluminum alloy raw materials and copper chloride, wherein nickel chloride The molar ratio with cupric chloride i...

Embodiment 3

[0046] Aluminum alloy is 356 (Sr) aluminum alloy in the present embodiment

[0047] (1) Preparation of aluminum alloy melt:

[0048] Mix and melt the 7050 aluminum alloy raw materials, add hexachloroethane with 0.7% of the total weight of the aluminum alloy raw materials, stir once every 10 minutes after adding the hexachloroethane, and stir for a total of 5 times; keep the melting temperature constant, and pass in Ar gas, The rate of feeding Ar gas is 0.25m 3 / min, refining for 7min, covered with flux to obtain aluminum alloy melt;

[0049] Wherein, flux is by the KCl of 50% by mass percentage, the NaCl of 25% and the NaCl of 25% 3 AlF 6 composition;

[0050] (2) Cast aluminum alloy ingot:

[0051] Keeping the temperature of the molten state constant, add a mixture of 0.06% of the total weight of aluminum alloy raw materials sodium fluoride, 0.6% of the total weight of aluminum alloy raw materials and nickel chloride and copper chloride, wherein nickel chloride The mola...

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Abstract

The invention discloses a method for treating the yellowing of the surface of an aluminum alloy ingot, and belongs to the technical field of aluminum alloy casting. In the present invention, firstly, hexachloroethane is added during the smelting process of the aluminum alloy ingot to degas and remove impurities, so as to avoid the formation of aluminum chemical reaction conditions, and a trace amount of sodium fluoride is added to avoid the adhesion of trace oxides that may be produced on the ingot surface. Nickel and copper chloride are used to improve the brightness of the ingot surface, and hexachloroethane is added again to remove gas and impurities. At the same time, the parameters in the casting process are controlled to ensure the good appearance and excellent performance of the final finished aluminum alloy ingot. The treatment method of the invention is simple, can simultaneously realize the treatment of the yellowing problem on the surface of the aluminum alloy in the casting process, has no restriction on the alloy elements in the aluminum alloy, has strong practicability and wide application range.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy casting, in particular to a method for treating the yellowing of the surface of an aluminum alloy ingot. Background technique [0002] Aluminum alloy is an extended product of pure aluminum, and the density of pure aluminum is small (ρ=2.7g / m 3 ), which is about 1 / 3 of iron, and has a low melting point, about 660°C; aluminum has a face-centered cubic structure, so it has high plasticity (δ: 32-40%, ψ: 70-90%), so It is easy to process and can be made into various profiles and plates. However, the strength of pure aluminum is very low, so it is not suitable for structural materials. Through long-term production practice and scientific experiments, people gradually strengthen aluminum by adding alloy elements and using heat treatment, so as to obtain a series of aluminum alloy products. [0003] Aluminum alloy is an alloy composed of aluminum as the base material, and then adding one or mor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C1/06B22D1/00C22C21/02
CPCB22D1/00C22C1/026C22C1/06C22C21/02
Inventor 郭军辉赵玉兵王妍妍郑红亮郑聚备艾武齐敬
Owner 保定隆达铝业有限公司
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