CN112176265A - Method for obviously improving intergranular corrosion of Al-Mg-Mn-Er aluminum alloy - Google Patents
Method for obviously improving intergranular corrosion of Al-Mg-Mn-Er aluminum alloy Download PDFInfo
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- CN112176265A CN112176265A CN202011025607.7A CN202011025607A CN112176265A CN 112176265 A CN112176265 A CN 112176265A CN 202011025607 A CN202011025607 A CN 202011025607A CN 112176265 A CN112176265 A CN 112176265A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
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Abstract
The invention provides a method for obviously improving intergranular corrosion of Al-Mg-Mn-Er aluminum alloy, which comprises the following steps: and extruding the cast ingot and then carrying out on-line quenching. The Al-Mg-Mn-Er series alloy extrusion product obtained by the method provided by the invention has greatly improved intergranular corrosion, and the alloy is subjected to an intergranular corrosion test according to a standard method specified by ASTM G67, so that the loss mass is not more than 10Mg/cm2The loss is basically 3-6 mg/cm2Far below the loss mass of not more than 15mg/cm2The technical requirements of (2) meet the production requirements.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to a method for obviously improving intergranular corrosion of Al-Mg-Mn-Er aluminum alloy.
Background
Considering that Al-Mg-Mn-Er is a non-heat-treatable strengthened aluminum alloy, the order of the extruded product is mostly H112 state (hot extrusion molding) or O state (annealed state). The Al-Mg-Mn-Er aluminum alloy has the technical requirements that the intergranular corrosion is as follows: the material is tested according to the standard method specified in ASTM G67, and the loss mass is not more than 15mg/cm2(ii) a The order state of the product is H112 state, which belongs to the hot extrusion molding product, and the existing production process generally comprises the following steps: extrusion, stretching and finished product delivery, and the working procedures are simpler. But the prior production process can not ensure that the intercrystalline corrosion of the obtained product completely meets the technical requirements.
Disclosure of Invention
In view of the above, the present invention provides a method for significantly improving intergranular corrosion of Al-Mg-Mn-Er aluminum alloys, which can significantly improve the intergranular corrosion effect of Al-Mg-Mn-Er aluminum alloys.
The invention provides a method for obviously improving intergranular corrosion of Al-Mg-Mn-Er aluminum alloy, which comprises the following steps: and extruding the cast ingot and then carrying out on-line quenching.
In the present invention, the method for significantly improving the intergranular corrosion of the Al-Mg-Mn-Er aluminum alloy preferably specifically comprises:
and sequentially extruding, quenching on line, stretching, sampling and finely rectifying the cast ingot.
In the present invention, the composition of the ingot is preferably:
less than or equal to 0.4 wt% of Si;
less than or equal to 0.4 wt% of Fe;
cu of less than or equal to 0.1 wt%;
0.7 to 1.3 wt% Mn;
5.5 to 6.5 wt% of Mg;
zn of less than or equal to 0.2wt percent;
0.02 to 0.12 wt% of Zr;
0.1-0.3 wt% Er;
the balance being Al.
In the present invention, the mass content of Si is preferably 0.3% or less, more preferably 0.15% or less; the mass content of the Fe is preferably less than or equal to 0.3 percent, and more preferably less than or equal to 0.2 percent; the mass content of Cu is preferably less than or equal to 0.08 percent, more preferably less than or equal to 0.05 percent, and most preferably less than or equal to 0.03 percent; the mass content of Mn is preferably 0.8-1.2%, more preferably 0.9-1.1%, and most preferably 1%; the mass content of Mg is preferably 5.8-6.2%, and more preferably 6%; the mass content of Zn is preferably less than or equal to 0.1 percent, and more preferably less than or equal to 0.05 percent; the mass content of Zr is preferably 0.04-0.12%, more preferably 0.08-0.12%; the mass content of Er is preferably 0.15-0.25%, and more preferably 0.2%.
The source of the ingot is not particularly limited, and the ingot can be prepared by smelting and pouring alloy raw materials according to a method well known by a person skilled in the art; and may also be commercially available.
In the invention, the ingot casting temperature in the extrusion process is preferably 430-500 ℃, more preferably 440-480 ℃, and most preferably 450-470 ℃; the cylinder temperature is preferably 420-460 ℃, more preferably 430-450 ℃ and most preferably 440 ℃; the temperature of the die is preferably 400-450 ℃, more preferably 410-440 ℃, and most preferably 420-430 ℃; the extrusion speed is preferably 0.3 to 1.0m/min, more preferably 0.5 to 0.8m/min, and most preferably 0.6 to 0.7 m/min.
In the invention, in the on-line quenching process, the ingot is preferably extruded out of the guide path and then immediately placed into water for quenching, the temperature of the water is preferably normal temperature, the normal temperature is not particularly limited in the invention, and the definition of the normal temperature well known to the skilled person in the art is that the normal temperature is preferably 20-30 ℃, and more preferably 25 ℃.
In the present invention, the stretching ratio in the stretching process is preferably 1.5 to 3%, more preferably 2 to 2.5%.
The sampling method is not particularly limited in the present invention, and the technical scheme of sampling known to those skilled in the art can be adopted.
The method for fine correction is not particularly limited, and the technical scheme of fine correction known to those skilled in the art can be adopted.
In the present invention, the finishing preferably further comprises cutting, inspecting and delivering the finished product.
In the prior art, the structure, mechanical property and spalling corrosion property of an Al-Mg-Mn-Er series product can well meet the technical requirements of the product by adjusting extrusion process parameters or a stretching process, but through the test of intergranular corrosion, the intergranular corrosion of the Al-Mg-Mn-Er series aluminum alloy extruded product obtained in the prior art is generally 10-20 Mg/cm2The intergranular corrosion requirement of the product cannot be met: the material is tested according to the standard method specified in ASTM G67, and the loss mass is not more than 15mg/cm2。
The invention fully considers that the initial recrystallization temperature of the Al-Mg-Mn-Er aluminum alloy is about 270-300 ℃, and in order to inhibit the precipitation of coarse phases in the hot extrusion process, the online quenching device is adopted to produce the aluminum alloy extruded productAnd immediately quenching the extruded product. The Al-Mg-Mn-Er series alloy extruded product obtained by the method provided by the invention has greatly improved intergranular corrosion, and the alloy is subjected to an intergranular corrosion test according to a standard method specified by ASTM G67, so that the loss mass is not more than 10Mg/cm2The loss is basically 3-6 mg/cm2Far below the loss mass of not more than 15mg/cm2The technical requirements of (2) meet the production requirements.
The method provided by the invention solves the problem of intergranular corrosion of Al-Mg-Mn-Er aluminum alloy, and satisfies the intergranular corrosion test of the material according to the standard method specified by ASTM G67, and the loss mass is not more than 15Mg/cm2The technical requirements of (1).
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 shows an on-line quenching apparatus used in quenching treatment according to 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.
The ingot casting components adopted by the following examples and comparative examples of the invention are:
si: 0.07 wt%; fe: 0.18 wt%; 0.02wt of Cu; mn: 1.0 wt%; mg: 6.17 wt%; zn: 0.02 wt%; ti: 0.025 wt%; zr: 0.09 wt%; er: 0.21 wt%, the balance being Al.
Comparative example 1
An Al-Mg-Mn-Er aluminum alloy product was prepared according to the following method:
sequentially extruding, stretching, sampling and finely rectifying the cast ingot;
the ingot casting temperature in the extrusion process is 430 ℃, the cylinder temperature is 420 ℃, the mold temperature is 400 ℃, and the extrusion speed is 0.3 m/min;
the stretching ratio in the stretching process was 1.5%.
The Al-Mg-Mn-Er aluminum alloy products prepared in comparative example 1 of the present invention were tested for intergranular corrosion performance in accordance with ASTM G67-2004, and as a result, the Al-Mg-Mn-Er aluminum alloy prepared in comparative example 1 had a loss mass of 14Mg/cm2、16mg/cm2、16mg/cm2。
Example 1
An Al-Mg-Mn-Er aluminum alloy product was produced according to the method of comparative example 1, which is different from comparative example 1 in that in-line quenching was performed after extrusion and before drawing;
and the on-line quenching is to extrude the cast ingot out of the guide way and then immediately put the cast ingot into water for quenching, wherein the temperature of the water is normal temperature.
The Al-Mg-Mn-Er aluminum alloy products prepared in example 1 of the present invention were tested for intergranular corrosion performance according to ASTM G67-2004, and the Al-Mg-Mn-Er aluminum alloy prepared in example 1 was tested for a loss mass of 3Mg/cm2、3mg/cm2、6mg/cm2。
Comparative example 2
An Al-Mg-Mn-Er aluminum alloy product was prepared according to the following method:
sequentially extruding, stretching, sampling and finely rectifying the cast ingot;
the ingot casting temperature in the extrusion process is 470 ℃, the cylinder temperature is 440 ℃, the die temperature is 430 ℃ and the extrusion speed is 0.7 m/min;
the stretching ratio in the stretching process was 2.5%.
The Al-Mg-Mn-Er aluminum alloy products prepared in comparative example 2 of the present invention were tested for intergranular corrosion performance in accordance with ASTM G67-2004, and the Al-Mg-Mn-Er aluminum alloy products prepared in comparative example 2 were found to be damagedThe weight loss is 12mg/cm2、15mg/cm2、14mg/cm2。
Example 2
An Al-Mg-Mn-Er aluminum alloy product was produced according to the method of comparative example 2, which is different from comparative example 2 in that on-line quenching was performed after extrusion and before drawing;
and the on-line quenching is to extrude the cast ingot out of the guide way and then immediately put the cast ingot into water for quenching, wherein the temperature of the water is normal temperature.
The Al-Mg-Mn-Er aluminum alloy products prepared in example 2 of the present invention were tested for intergranular corrosion performance according to ASTM G67-2004, and the Al-Mg-Mn-Er aluminum alloy prepared in example 2 was tested for a loss mass of 3Mg/cm2、3mg/cm2、4mg/cm2。
Comparative example 3
An Al-Mg-Mn-Er aluminum alloy product was prepared according to the following method:
sequentially extruding, stretching, sampling and finely rectifying the cast ingot;
the ingot casting temperature in the extrusion process is 500 ℃, the cylinder temperature is 460 ℃, the die temperature is 450 ℃, and the extrusion speed is 1.0 m/min;
the stretching ratio in the stretching process was 3%.
The Al-Mg-Mn-Er aluminum alloy products prepared in comparative example 3 of the present invention were tested for intergranular corrosion performance in accordance with ASTM G67-2004, and as a result, the Al-Mg-Mn-Er aluminum alloy prepared in comparative example 3 had a loss mass of 13Mg/cm2、16mg/cm2、17mg/cm2。
Example 3
An Al-Mg-Mn-Er aluminum alloy product was produced according to the method of comparative example 3, which is different from comparative example 3 in that in-line quenching was performed after extrusion and before drawing;
and the on-line quenching is to extrude the cast ingot out of the guide way and then immediately put the cast ingot into water for quenching, wherein the temperature of the water is normal temperature.
The Al-Mg-Mn-Er aluminum alloy products prepared in example 3 of the present invention were tested for intergranular corrosion performance according to ASTM G67-2004, and the Al-Mg-Mn-Er aluminum alloy prepared in example 3 was tested for a loss mass of 3Mg/cm2、3mg/cm2、3mg/cm2。
From the above embodiments, the present invention provides a method for significantly improving intergranular corrosion of Al-Mg-Mn-Er aluminum alloy, comprising: and extruding the cast ingot and then carrying out on-line quenching. The Al-Mg-Mn-Er series alloy extrusion product obtained by the method provided by the invention has greatly improved intergranular corrosion, and the alloy is subjected to an intergranular corrosion test according to a standard method specified by ASTMG67, so that the loss mass is not more than 10Mg/cm2The loss is basically 3-6 mg/cm2Far below the loss mass of not more than 15mg/cm2The technical requirements of (2) meet the production requirements.
Claims (9)
1. A method for obviously improving intergranular corrosion of Al-Mg-Mn-Er series aluminum alloy comprises the following steps: and extruding the cast ingot and then carrying out on-line quenching.
2. The method according to claim 1, wherein the on-line quenching is specifically:
and extruding the cast ingot out of the guide path, and immediately putting the cast ingot into water for quenching, wherein the temperature of the water is normal temperature.
3. The method according to claim 1, wherein the method for significantly improving the intergranular corrosion of the Al-Mg-Mn-Er aluminum alloy specifically comprises the following steps:
and sequentially extruding, quenching on line, stretching, sampling and finely rectifying the cast ingot.
4. The method of claim 3, wherein the composition of the ingot is:
less than or equal to 0.4 wt% of Si;
less than or equal to 0.4 wt% of Fe;
cu of less than or equal to 0.1 wt%;
0.7 to 1.3 wt% Mn;
5.5 to 6.5 wt% of Mg;
zn of less than or equal to 0.2wt percent;
0.02 to 0.12 wt% of Zr;
0.1-0.3 wt% Er;
the balance being Al.
5. The method of claim 3, wherein the temperature of the ingot is 430-500 ℃.
6. The method according to claim 3, wherein the barrel temperature during the extrusion is 420 to 460 ℃.
7. The method according to claim 3, wherein the die temperature during the extrusion is 400 to 450 ℃.
8. The method according to claim 3, wherein the extrusion speed in the extrusion process is 0.3 to 1.0 m/min.
9. The method according to claim 3, wherein the stretching ratio in the stretching process is 1.5% to 3%.
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