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High-Cr aluminum alloy plate strip for anodic oxidation and preparation method of high-Cr aluminum alloy plate strip

An aluminum alloy strip and anodic oxidation technology, which is applied in the field of aluminum alloy materials, can solve the problems of high hardness, grain formation on the surface of the strip, and difficulty in breaking.

Active Publication Date: 2022-03-01
中铝河南洛阳铝加工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the amount of Cr added is high (≥0.2wt.%), it is easy to form coarse intermetallic compounds at the grain boundaries of aluminum alloys, which are refractory and have high hardness, and are difficult to break after subsequent rolling and heat treatment. Defects such as material lines formed on the surface of the plate and strip have adverse effects on the strength of the plate and strip, which has become a key factor restricting the popularization and application of this type of product

Method used

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  • High-Cr aluminum alloy plate strip for anodic oxidation and preparation method of high-Cr aluminum alloy plate strip
  • High-Cr aluminum alloy plate strip for anodic oxidation and preparation method of high-Cr aluminum alloy plate strip
  • High-Cr aluminum alloy plate strip for anodic oxidation and preparation method of high-Cr aluminum alloy plate strip

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Embodiment 1

[0021] Example 1: A high-Cr aluminum alloy plate and strip for anodic oxidation and its preparation method, the composition of the aluminum alloy is as follows, Si=0.02%; Fe=0.11%; Cu=0.03%; Mn=0.03%; Mg=0.6% : Cr=0.2%; Ti=0.02%, and the rest of Al and unavoidable impurities. The preparation method comprises the following steps:

[0022] (1) Melting and semi-continuous casting: Melting temperature 740°C, semi-continuous casting temperature 700°C, casting speed 50mm / min, single crystallizer cooling water flow 50m 3 / h;

[0023] (2) Homogenization heat treatment: After the cast ingot is cut from the head and tail, the upper and lower milling surfaces are 12mm for homogenization heat treatment. The homogenization temperature is 550°C and the holding time is 18h;

[0024] (3) Hot rolling: start rolling temperature 480°C, finish rolling temperature 350°C;

[0025] (4) Cold rolling: the thickness of the plate is reduced from 7mm to 2mm, and intermediate annealing is performed whe...

Embodiment 2

[0027] Example 2: A high-Cr aluminum alloy plate and strip for anodic oxidation and its preparation method, the composition of the aluminum alloy is as follows, Si=0.03%; Fe=0.12%; Cu=0.04%; Mn=0.02%; Mg=0.6% : Cr=0.4%; Ti=0.02%, and the rest of Al and unavoidable impurities. The preparation method comprises the following steps:

[0028] (1) Melting and semi-continuous casting: Melting temperature 750°C, semi-continuous casting temperature 715°C, casting speed 50mm / min, single crystallizer cooling water flow 50m 3 / h;

[0029] (2) Homogenization heat treatment: After the cast ingot is cut from the head and tail, the upper and lower milling surfaces are 12mm for homogenization heat treatment. The homogenization temperature is 510°C and the holding time is 18h;

[0030] (3) Hot rolling: start rolling temperature 465°C, finish rolling temperature 350°C;

[0031] (4) Cold rolling: the thickness of the sheet is reduced from 7mm to 1.5mm, and intermediate annealing is performed w...

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Abstract

The invention relates to a high-Cr aluminum alloy plate strip for anodic oxidation and a preparation method of the high-Cr aluminum alloy plate strip. The aluminum alloy plate strip comprises the following main components in percentage by mass: greater than or equal to 0.2% of Cr; mg > 0.5%; less than 1.0% of Cu; mn is less than 0.1%; less than 0.05% of Ti, and the balance Al and inevitable impurities; the surface roughness of the aluminum alloy plate strip is smaller than 0.5 micrometer, the tensile strength ranges from 145 MPa to 185 MPa, the yield strength is larger than 110 MPa, the ductility is larger than 2%, and the electrode potential is larger than-0.70 V. After the aluminum alloy plate strip is subjected to anodic oxidation treatment, the surface glossiness GU is larger than 300, and the brightness L is larger than 70. The preparation method comprises the steps of smelting, semi-continuous casting, homogenizing heat treatment, hot rolling and cold rolling. By regulating and controlling the casting process and the heat treatment process, the adverse effect of the high-content Cr element on the mechanical property and the surface quality of the plate is overcome.

Description

technical field [0001] The invention belongs to the field of aluminum alloy materials, and in particular relates to a high-Cr aluminum alloy plate strip for anodic oxidation and a preparation method thereof. Background technique [0002] With the rapid development of the aluminum alloy industry, the application fields of aluminum alloy are becoming wider and wider, especially in 3C electronic products, curtain wall decorative panels and electrical equipment. Aluminum alloy products not only have good surface flatness, but also have uniform surface color and smooth touch after anodic oxidation treatment, and have been widely used in the field of 3C products. Compared with steel, aluminum alloy is lighter in weight and easier to process. It is used as a building curtain wall Decorative panels not only have a smooth appearance and rich colors, but more importantly, they are more conducive to the personalized design of the building shape while reducing the load on the main struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/08C22C1/02C22F1/04C22F1/047C21D8/02B22D11/22B22D11/18C25D11/04
CPCC22C21/00C22C21/08C22C1/026C22F1/04C22F1/047C21D8/0226C21D8/0236C21D8/0247C21D8/0268B22D11/003B22D11/22B22D11/18C25D11/04
Inventor 林师朋扬升高崇李娜赖爱玲贵星卉吴广奇刘辉
Owner 中铝河南洛阳铝加工有限公司