1. The preparation method of the 6-series aluminum alloy with high strength and high anodic oxidation effect for the electronic product is characterized by comprising the following steps: the aluminum alloy comprises the following components, by mass, 0.60-1.20 wt% of Mg0.70-0.95 wt%, 0.55-1.20 wt% of Cu0.10 wt% or less of Mn, 0.10 wt% or less of Cr, 0.05 wt% or less of Ti, 0.10 wt% or less of Fe, 0.02-0.20 wt% of Zr0.02-0.20 wt% of Al and the balance of impurities.

2. The method for preparing a 6-series aluminum alloy with high strength and high anodic oxidation effect for electronic products according to claim 1, comprising the steps of:

the method comprises the following steps: firstly, carrying out homogenizing annealing on a cast rod, wherein the temperature range is 510-540 ℃;

step two: after preserving heat for 2-10 hours, heating to 545-570 ℃, and preserving heat for 8-20 hours;

step three: extruding, wherein the temperature of an extrusion rod is 520-570 ℃, the extrusion speed is 5-16 m/min, and the outlet temperature is 520-580 ℃;

step four: and carrying out aging treatment at 160-210 ℃, and then preserving heat for 2-20 h.

3. The method for preparing a 6-series aluminum alloy with high strength and high anodic oxidation effect for electronic products according to claim 1, wherein the method comprises the following steps: the Zr content is preferably 0.10-0.15 wt%.

4. The method for preparing a 6-series aluminum alloy with high strength and high anodic oxidation effect for electronic products according to claim 1, wherein the method comprises the following steps: the preferable Mn content by mass percentage is less than or equal to 0.02 wt%.

Background

The 6-series aluminum alloy has better mechanical property and anodic oxidation effect, so the 6-series aluminum alloy is widely applied to manufacturing of appearance parts of electronic products. To obtain a better anodic appearance, the material must have a finer microstructure, such as fine grains, fine and dispersed intermetallic compounds. Therefore, in addition to the machining process, the material needs to have a lower alloying level. However, the low alloying level is not favorable for improving the strength. In addition, Mn is often added to the exterior of electronic products to control the grain size. However, the control ability of Mn element to crystal grains is far inferior to that of Zr element. Therefore, it is necessary to develop an aluminum alloy containing Zr and having both high strength and anodic oxidation effect for manufacturing exterior parts of electronic products and a processing process thereof.

Therefore, it is necessary to invent a method for preparing a 6-series aluminum alloy with high strength and high anodic oxidation effect for electronic products to solve the above problems.

Disclosure of Invention

The invention aims to provide a preparation method of a 6-series aluminum alloy with high strength and high anodic oxidation effect for electronic products, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the preparation method of the 6-series aluminum alloy with high strength and high anodic oxidation effect for the electronic product is characterized by comprising the following steps: the aluminum alloy comprises the following components, by mass, 0.60-1.20 wt% of Mg0.70-0.95 wt%, 0.55-1.20 wt% of Cu0.10 wt% or less of Mn, 0.10 wt% or less of Cr, 0.05 wt% or less of Ti, 0.10 wt% or less of Fe, 0.02-0.20 wt% of Zr0.02-0.20 wt% of Al and the balance of impurities.

Preferably, the method comprises the following steps:

the method comprises the following steps: firstly, carrying out homogenizing annealing on a cast rod, wherein the temperature range is 510-540 ℃;

step two: after preserving heat for 2-10 hours, heating to 545-570 ℃, and preserving heat for 8-20 hours;

step three: extruding, wherein the temperature of an extrusion rod is 520-570 ℃, the extrusion speed is 5-16 m/min, and the outlet temperature is 520-580 ℃;

step four: and carrying out aging treatment at 160-210 ℃, and then preserving heat for 2-20 h.

Preferably, the Zr content is 0.10-0.15 wt% in percentage by mass.

Preferably, the Mn content by mass is less than or equal to 0.02 wt%.

The invention has the technical effects and advantages that:

according to the invention, the structure of the material is finely controlled by adjusting the contents of the strengthening elements and the trace elements and controlling the processing technology, so that the material has both high strength and high anodic oxidation effect.

Drawings

FIG. 1 is a comparative schematic of an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The aluminum alloy comprises the following components in percentage by mass: mg0.60 wt%, Si 0.95 wt%, Cu 1.20 wt%, Mn 0.10 wt%, Cr 0.10 wt%, Ti 0.05 wt%, Fe 0.10 wt%, Zr0.02 wt%;

firstly, carrying out homogenizing annealing on a cast rod, keeping the temperature at 510 ℃ for 10 hours, and then heating to 570 ℃ and keeping the temperature for 8 hours; then extruding, wherein the temperature of an extrusion rod is 570 ℃, the extrusion speed is 5 m/min, and the outlet temperature is 580 ℃; aging treatment is carried out, and the temperature is kept for 20h at 160 ℃.

Example 2

The aluminum alloy comprises the following components in percentage by mass: mg 1.20 wt%, Si0.7 wt%, Cu0.55 wt%, Mn 0.08 wt%, Cr 0.07 wt%, Ti 0.02 wt%, Fe 0.06 wt%, Zr 0.20 wt%;

firstly, carrying out homogenizing annealing on a cast rod, keeping the temperature at 540 ℃ for 2 hours, and then heating to 545 ℃ and keeping the temperature for 20 hours; then, extruding, wherein the temperature of an extrusion rod is 520 ℃, the extrusion speed is 16 m/min, and the outlet temperature is 520 ℃; carrying out aging treatment and heat preservation at 210 ℃ for 2 h.

Example 3

The aluminum alloy comprises the following components in percentage by mass: mg 0.88 wt%, Si 0.85 wt%, Cu 0.85 wt%, Mn 0.01 wt%, Cr 0.01 wt%, Ti 0.02 wt%, Fe 0.07 wt%, Zr 0.18 wt%;

firstly, carrying out homogenizing annealing on a cast rod, keeping the temperature at 530 ℃ for 8 hours, and then heating to 550 ℃ and keeping the temperature for 15 hours; then extruding, wherein the temperature of an extrusion rod is 530 ℃, the extrusion speed is 8 m/min, and the outlet temperature is 540 ℃; aging treatment is carried out, and the temperature is kept for 8 hours at 180 ℃.

Example 4

The aluminum alloy comprises the following components in percentage by mass: mg 0.98 wt%, Si 0.75 wt%, Cu 0.95 wt%, Mn 0.01 wt%, Cr 0.01 wt%, Ti 0.02 wt%, Fe 0.07 wt%, Zr 0.13 wt%;

firstly, carrying out homogenizing annealing on a cast rod, keeping the temperature at 535 ℃, then heating to 555 ℃ and keeping the temperature for 17 hours after keeping the temperature for 9 hours; then extruding, wherein the temperature of an extrusion rod is 540 ℃, the extrusion speed is 10 m/min, and the outlet temperature is 550 ℃; aging treatment is carried out at 185 ℃ and heat preservation is carried out for 7 h.

Example 5

The aluminum alloy comprises the following components in percentage by mass: mg 0.5 wt%, Si 0.6 wt%, Cu 0.15 wt%, Mn 0.56 wt%, Cr 0.25 wt%, Ti 0.18 wt%, Fe 0.25 wt%;

firstly, casting ingot and carrying out homogenization annealing: maintaining the temperature at 535 ℃ for 9 hours, then heating to 555 ℃ and maintaining the temperature for 17 hours; then extruding, wherein the temperature of an extrusion rod is 540 ℃, the extrusion speed is 10 m/min, and the outlet temperature is 550 ℃; aging treatment is carried out at 185 ℃ and heat preservation is carried out for 7 h.

Example 6

The aluminum alloy comprises the following components in percentage by mass: mg 0.98 wt%, Si 0.75 wt%, Cu 0.95 wt%, Mn 0.01 wt%, Cr 0.01 wt%, Ti 0.02 wt%, Fe 0.07 wt%, Zr 0.13 wt%;

firstly, carrying out homogenizing annealing on a cast rod, at 535 ℃, carrying out extrusion after heat preservation is carried out for 9 hours, wherein the temperature of an extrusion rod is 500 ℃, the extrusion speed is 10 m/min, and the outlet temperature is 520 ℃; aging at 175 deg.C for 6 h.

It should be noted that:

the performance of 6 series aluminum alloy is influenced by the alloying degree, and the higher the contents of Mg, Si and Cu elements are, the higher the mechanical property is. However, increasing the degree of alloying causes a decrease in the anodic oxidation effect on the one hand, and also causes inconvenience to the casting process, and the ingot is likely to crack during the casting process. In addition, Mg and Si are main alloying elements of the alloy, and besides solid solution strengthening, the Mg and Si elements form a strengthening phase Mg2Si phase. The phase can only play a role in strengthening after being dissolved into a matrix in the process of homogenizing fire and separating out a nano-scale transition phase in the aging process. If the Mg and Si contents are too high, the excess Mg2Si formed cannot be dissolved in the matrix during the soaking process, but remains in the structure, failing to improve the strength, and also reducing the anodizing effect. Therefore, Mg is preferably 0.60 to 1.20 wt%, and Si is preferably 0.70 to 0.95 wt%. Cu mainly acts to strengthen the solid solution and promote the precipitation of Mg2Si phase, while Cu-containing strengthening phase Q phase is also introduced. However, the excessive Cu content may cause the corrosion resistance of the material to be reduced. Therefore, Cu is preferably 0.55 to 1.20 wt%.

Mn, Cr and Ti mainly play a role in grain refinement, but excessive addition easily causes the material to have dark color after anode, and the controllability of the grain size is poorer than that of Zr. Zr has better control effect on the crystal grains of the aluminum alloy. In addition, when Zr is contained in the material, if the content of Mn, Cr, and other elements is kept high, a fibrous structure is easily formed, and the anodic oxidation effect of the material is reduced. Therefore, Mn is less than or equal to 0.10 wt%, Cr is less than or equal to 0.10 wt%, Ti is less than or equal to 0.05 wt%, and Zr is preferably 0.02-0.20 wt%. Fe is an impurity element, and the content of the Fe is preferably less than or equal to 0.10 wt% so as to avoid the anode corrosion phenomenon.

After the aluminum alloy with the components is obtained, the following processing is carried out: firstly, carrying out homogenizing annealing on a cast rod, keeping the temperature at 510-540 ℃ for 2-10 hours, then heating to 545-570 ℃ and keeping the temperature for 8-20 hours; then extruding, wherein the temperature of an extrusion rod is 520-570 ℃, the extrusion speed is 5-16 m/min, and the outlet temperature is 520-580 ℃; carrying out aging treatment at 160-210 ℃ and keeping the temperature for 2-20 h; the temperature of the extruded rod, the extrusion speed and the outlet temperature are controlled mainly to enable the material to have a better quenching effect to prepare for subsequent aging. The aging process is controlled to ensure that the material has higher comprehensive mechanical properties.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.