CN113308652A - Corrosion-resistant strengthening process combining aluminum alloy regression and reaging and cryogenic treatment - Google Patents
Corrosion-resistant strengthening process combining aluminum alloy regression and reaging and cryogenic treatment Download PDFInfo
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Abstract
The invention belongs to the field of aluminum alloy heat treatment, and particularly relates to a corrosion-resistant strengthening method combining aluminum alloy regression and reaging and cryogenic treatment. The cryogenic treatment takes liquid nitrogen as a medium and keeps the temperature at-196 ℃ for 10-16 h. The cryogenic treatment is applied to different steps of solid solution and aging, the number, size and distribution of crystal boundary precipitated phases are changed, and the electrochemical corrosion mode of the alloy is further changed. After the regression treatment, the cryogenic treatment is adopted, and discontinuous grain boundary precipitates present a better distribution state, which is beneficial to improving the corrosion resistance.
Description
Technical Field
The invention belongs to the field of aluminum alloy heat treatment, and relates to an aluminum alloy regression and reaging and cryogenic treatment combined corrosion-resistant strengthening method.
Background
7xxx aluminum alloys are representative of high strength aluminum alloys and are increasingly being used for their excellent properties. The performance of the aluminum alloy is sensitive to microstructure and is influenced by nucleation, growth and distribution of precipitated phases in the alloy. The traditional heat treatment process is solution treatment and aging treatment, and the regression re-aging treatment is proved to be a heat treatment process capable of improving the corrosion resistance of the alloy, but the single aging treatment causes the loss of the mechanical property of the alloy, and the mechanical property is partially lost compared with the T6 treatment. The subzero treatment can modify the aluminum alloy, obviously improve the uniformity and dimensional stability of the material, reduce the deformation of the material and prolong the service life of the material, and the corrosion resistance of the material can be improved on the premise of keeping the mechanical property of the alloy unchanged or even improving the mechanical property of the alloy, so the subzero treatment is often used as a supplementary means of heat treatment and is widely applied to the field of alloys. In addition, the cryogenic treatment has the advantages of easy operation, good treatment quality, low operation cost and the like, and is beneficial to actual production.
Disclosure of Invention
Object of the Invention
In order to solve the problem that the prior art is lack of an aluminum alloy cryogenic treatment process, the invention provides a corrosion resistance strengthening method combining aluminum alloy regression and reaging with cryogenic treatment, and aims to change the heating process of regression and reaging through cryogenic treatment, influence the size, quantity and distribution condition of crystal boundary precipitated phases in the alloy, and improve the corrosion resistance of the alloy.
Technical scheme
An aluminum alloy regression and reaging and deep cooling treatment combined corrosion-resistant strengthening process is provided, and the aluminum alloy is suitable for a heat-treatable strengthened aluminum alloy 7 series; the method is characterized by comprising the following steps:
firstly, polishing the aluminum alloy to have metallic luster by using abrasive paper;
step two, heating the box-type resistance furnace to the temperature of 450-470 ℃, putting the 7xxx series aluminum alloy into the furnace after the temperature is stable, carrying out solid solution treatment on the aluminum alloy, wherein the solid solution treatment time is 1-2h, monitoring the furnace temperature through a potential difference meter, and controlling the error of the furnace temperature to be +/-2 ℃; carrying out quenching treatment, wherein deionized water with the temperature of 0-5 ℃ is used, and the transfer time is within 2 s;
step three, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12-16h at the temperature of 100-;
step four, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 8-20min at the temperature of 180-;
step five, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12-16h at the temperature of 100-;
step six, air cooling is carried out to obtain the traditional heat treatment aluminum alloy;
the steps also comprise a cryogenic treatment step: taking liquid nitrogen as a medium, and preserving the heat of the aluminum alloy obtained in the previous step at the temperature of-196 ℃ for 10-16 h;
wherein the step of the cryogenic treatment is placed after any one of the steps one to five, and the step of the cryogenic treatment is only required to be performed once in each case.
The method comprises the following steps:
firstly, polishing the aluminum alloy to have metallic luster by using abrasive paper;
step two, heating the box-type resistance furnace to the temperature of 450-470 ℃, putting the 7xxx series aluminum alloy into the furnace after the temperature is stable, carrying out solid solution treatment on the aluminum alloy, wherein the solid solution treatment time is 1-2h, monitoring the furnace temperature through a potential difference meter, and controlling the error of the furnace temperature to be +/-2 ℃; carrying out quenching treatment, wherein deionized water with the temperature of 0-5 ℃ is used, and the transfer time is within 2 s;
step three, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12-16h at the temperature of 100-;
step four, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 8-20min at the temperature of 180-;
step five, cryogenic treatment: keeping the temperature at-196 deg.C for 10-16h with liquid nitrogen as medium;
sixthly, placing the mixture into a digital display air-blast drying box for aging treatment, and preserving heat for 12-16h at the temperature of 100-;
and seventhly, performing air cooling to obtain the traditional heat-treated aluminum alloy.
In the first step, sand paper is used for polishing, the sand paper is 240-2000 meshes, polishing paste is used for polishing, and the polishing paste is 1000-8000 meshes.
The aluminum alloy workpiece is a 7xxx series aluminum alloy, and the alloy quality components are as follows: 0.2 to 0.4 percent of silicon, 0.1 to 0.5 percent of iron, 1.2 to 2.0 percent of copper, 0.2 to 0.3 percent of manganese, 2.5 to 3.5 percent of magnesium, 0.18 to 0.25 percent of chromium, 5.8 to 7.5 percent of zinc, 0.16 to 0.20 percent of titanium and the balance of aluminum.
Deionized water was used for quenching.
The thickness of the aluminum alloy workpiece is 0.5mm-20mm, and the temperature of liquid nitrogen is-196 ℃.
The advantages and effects are as follows:
1. the method combining regression reaging and cryogenic treatment has the advantages of simple operation, good treatment quality, high treatment efficiency and cost saving.
2. The grain boundary precipitated phase which is primarily broken after aging is further broken in the deep cooling process, forms uniform grain boundary precipitated phase, grows in the aging process and is finally uniformly distributed at the grain boundary, and a precipitate-free precipitated zone is wider in the state, so that the mechanical property and the corrosion resistance of the alloy are improved.
3. The cryogenic treatment is applied to different steps of solid solution and aging, the number, size and distribution of crystal boundary precipitated phases are changed, and the electrochemical corrosion mode of the alloy is further changed.
Drawings
FIG. 1 is a time-temperature diagram of various stages of pre-cryogenic treatment using regression reaging;
FIG. 2 is a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy after the conventional regression and re-aging treatment strengthening process is adopted in example 1;
FIG. 3 is a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy after the strengthening process of the embodiment 2 combining the regression and reaging pretreatment with the cryogenic treatment;
FIG. 4 is a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy after the strengthening process of the embodiment 3 combining the regression and reaging pretreatment with the cryogenic treatment;
FIG. 5 is a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy after the strengthening process of the embodiment 4 combining the regression and reaging pretreatment with the cryogenic treatment;
FIG. 6 is a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy after the strengthening process of example 5, which combines the regression and reaging treatment with the pre-cryogenic treatment;
FIG. 7 is a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy after the strengthening process of example 6, which combines the regression and reaging treatment with the pre-cryogenic treatment.
Detailed Description
The process is suitable for heat-treatable strengthened 7xxx series aluminum alloy (Al-Zn-Mg-Cu), and comprises the following steps:
firstly, polishing the aluminum alloy to have metallic luster by using abrasive paper;
step two, heating the box-type resistance furnace to the temperature of 450-470 ℃, putting the 7xxx series aluminum alloy into the furnace after the temperature is stable, carrying out solid solution treatment on the aluminum alloy, wherein the solid solution treatment time is 1-2h, monitoring the furnace temperature through a potential difference meter, and controlling the error of the furnace temperature to be +/-2 ℃; carrying out quenching treatment, wherein deionized water with the temperature of 0-5 ℃ is used, and the transfer time is within 2 s;
step three, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12-16h at the temperature of 100-;
step four, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 8-20min at the temperature of 180-;
and step five, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12-16h at the temperature of 100-.
And sixthly, performing air cooling to obtain the traditional heat-treated aluminum alloy.
And seventhly, performing cryogenic treatment by using liquid nitrogen as a medium, and preserving heat for 10-16h at the temperature of-196 ℃. And (4) adding the subzero treatment into the step one to obtain the corrosion-resistant reinforced aluminum alloy.
And step eight, performing cryogenic treatment by taking liquid nitrogen as a medium, and preserving heat for 10-16h at the temperature of-196 ℃. And (5) adding the cryogenic treatment into the second step to obtain the corrosion-resistant reinforced aluminum alloy.
And step nine, performing cryogenic treatment by using liquid nitrogen as a medium, and preserving heat for 10-16h at the temperature of-196 ℃. And adding the subzero treatment into the third step to obtain the corrosion-resistant reinforced aluminum alloy.
Step ten, performing cryogenic treatment by using liquid nitrogen as a medium, and preserving heat for 10-16h at the temperature of-196 ℃. And adding the deep cooling treatment into the step four to obtain the corrosion-resistant reinforced aluminum alloy.
Step eleven, performing cryogenic treatment by using liquid nitrogen as a medium, and preserving heat for 10-16h at the temperature of-196 ℃. And adding the deep cooling treatment into the fifth step to obtain the corrosion-resistant reinforced aluminum alloy.
Wherein, only one of the steps from the seventh step to the eleventh step is selected for operation, and each case is shown in fig. 1.
Further, in the first step, sand paper is used for grinding, the sand paper is 240-2000 meshes, polishing paste is used for polishing, and the polishing paste is 1000-8000 meshes.
Further, in the second step, deionized water is used for quenching.
Further, in the step one, the thickness of the aluminum alloy workpiece is 0.5mm-20 mm.
Further, in the step one, the aluminum alloy workpiece is a 7-series aluminum alloy, and the aluminum alloy comprises the following alloy components in parts by mass: 0.2 to 0.4 percent of silicon, 0.1 to 0.5 percent of iron, 1.2 to 2.0 percent of copper, 0.2 to 0.3 percent of manganese, 2.5 to 3.5 percent of magnesium, 0.18 to 0.25 percent of chromium, 5.8 to 7.5 percent of zinc, 0.16 to 0.20 percent of titanium and the balance of aluminum.
The present invention will be described in detail with reference to examples.
Example 1:
firstly, grinding an aluminum alloy workpiece with the thickness of 0.5mm to metallic luster by using No. 2000 abrasive paper, polishing by using 1000-8000 meshes of polishing paste, and then placing on a workbench;
step two, heating the box type resistance furnace to 450 ℃, putting the 7xxx series aluminum alloy into the furnace after the temperature is stable, carrying out solid solution treatment on the aluminum alloy, wherein the solid solution treatment time is 1h, monitoring the furnace temperature through a potential difference meter, and controlling the error of the furnace temperature to be +/-2 ℃; carrying out quenching treatment, wherein deionized water with the temperature of 0-5 ℃ is used, and the transfer time is within 2 s;
step three, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12 hours at 120 ℃;
step four, placing the mixture into a digital display air-blast drying oven for aging treatment, and keeping the temperature at 180 ℃ for 8 min;
step five, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12 hours at 120 ℃;
and sixthly, performing air cooling to obtain the traditional heat-treated aluminum alloy, wherein a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy is shown in figure 2.
Example 2:
firstly, grinding an aluminum alloy workpiece with the thickness of 0.5mm to metallic luster by using No. 2000 abrasive paper, polishing by using 1000-8000 meshes of polishing paste, and then placing on a workbench;
step two, carrying out cryogenic treatment on the alloy, putting the alloy into liquid nitrogen, and keeping the temperature at-196 ℃ for 10 hours;
step three, heating the box type resistance furnace to 450 ℃, putting the 7xxx series aluminum alloy into the furnace after the temperature is stable, carrying out solid solution treatment on the aluminum alloy, wherein the solid solution treatment time is 1h, monitoring the furnace temperature through a potential difference meter, and controlling the error of the furnace temperature to be +/-2 ℃; carrying out quenching treatment, wherein deionized water with the temperature of 0-5 ℃ is used, and the transfer time is within 2 s;
step four, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 16 hours at 100 ℃;
step five, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 20min at 180 ℃;
and sixthly, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 16 hours at 120 ℃.
And seventhly, performing air cooling to obtain the corrosion-resistant reinforced aluminum alloy, wherein a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy is shown in FIG. 3.
Example 3:
firstly, grinding an aluminum alloy workpiece with the thickness of 0.5mm to metallic luster by using No. 2000 abrasive paper, polishing by using 1000-8000 meshes of polishing paste, and then placing on a workbench;
step two, heating the box-type resistance furnace to 470 ℃, putting the 7-series aluminum alloy into the furnace after the temperature is stable, carrying out solid solution treatment on the aluminum alloy, wherein the solid solution treatment time is 2 hours, monitoring the furnace temperature through a potential difference meter, and controlling the error of the furnace temperature to be +/-2 ℃; carrying out quenching treatment, wherein deionized water with the temperature of 0-5 ℃ is used, and the transfer time is within 2 s;
step three, carrying out cryogenic treatment on the alloy, putting the alloy into liquid nitrogen, and keeping the temperature at-196 ℃ for 10 hours;
step four, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12 hours at 120 ℃;
step five, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 8min at 180 ℃;
and step six, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12 hours at 120 ℃.
And seventhly, performing air cooling to obtain the corrosion-resistant reinforced aluminum alloy, wherein a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy is shown in FIG. 4.
Example 4:
step one, an aluminum alloy workpiece with the thickness of 0.5mm is ground to metallic luster by No. 2000 abrasive paper, and is placed on a workbench after being polished by polishing paste with the size of 1000-;
step two, heating the box type resistance furnace to 470 ℃, putting the 7xxx series aluminum alloy into the furnace after the temperature is stable, carrying out solid solution treatment on the aluminum alloy, wherein the solid solution treatment time is 2 hours, monitoring the furnace temperature through a potential difference meter, and controlling the error of the furnace temperature to be +/-2 ℃; carrying out quenching treatment, wherein deionized water with the temperature of 0-5 ℃ is used, and the transfer time is within 2 s;
step three, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 16 hours at 120 ℃;
step four, carrying out cryogenic treatment on the alloy, putting the alloy into liquid nitrogen, and keeping the alloy at the temperature of-196 ℃ for 12 hours;
step five, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 8min at 200 ℃;
and sixthly, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 16 hours at the temperature of 100 ℃.
And seventhly, performing air cooling to obtain the corrosion-resistant reinforced aluminum alloy, wherein a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy is shown in FIG. 5.
Example 5:
firstly, grinding an aluminum alloy workpiece with the thickness of 0.5mm to metallic luster by using No. 2000 abrasive paper, polishing by using 1000-8000 meshes of polishing paste, and then placing on a workbench;
step two, heating the box type resistance furnace to 470 ℃, putting the 7xxx series aluminum alloy into the furnace after the temperature is stable, carrying out solid solution treatment on the aluminum alloy, wherein the solid solution treatment time is 2 hours, monitoring the furnace temperature through a potential difference meter, and controlling the error of the furnace temperature to be +/-2 ℃; carrying out quenching treatment, wherein deionized water with the temperature of 0-5 ℃ is used, and the transfer time is within 2 s;
step three, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 16 hours at 120 ℃;
step four, placing the mixture into a digital display air-blast drying oven for aging treatment, and keeping the temperature at 200 ℃ for 8 min;
step five, carrying out cryogenic treatment on the alloy, putting the alloy into liquid nitrogen, and keeping the temperature at-196 ℃ for 12 hours;
sixthly, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 16 hours at 120 ℃;
and seventhly, performing air cooling to obtain the corrosion-resistant reinforced aluminum alloy, wherein a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy is shown in FIG. 6.
Example 6:
firstly, grinding an aluminum alloy workpiece with the thickness of 0.5mm to metallic luster by using No. 2000 abrasive paper, polishing by using 1000-8000 meshes of polishing paste, and then placing on a workbench;
step two, heating the box type resistance furnace to 470 ℃, putting the 7xxx series aluminum alloy into the furnace after the temperature is stable, carrying out solid solution treatment on the aluminum alloy, wherein the solid solution treatment time is 2 hours, monitoring the furnace temperature through a potential difference meter, and controlling the error of the furnace temperature to be +/-2 ℃; carrying out quenching treatment, wherein deionized water with the temperature of 0-5 ℃ is used, and the transfer time is within 2 s;
step three, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12 hours at 120 ℃, and step four, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 8 minutes at 180 ℃;
step five, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12 hours at 120 ℃;
step six, carrying out cryogenic treatment on the alloy, putting the alloy into liquid nitrogen, and keeping the temperature at-196 ℃ for 12 hours;
and seventhly, performing air cooling to obtain the traditional heat-treated aluminum alloy, wherein a Transmission Electron Microscope (TEM) image of the grain boundary morphology of the aluminum alloy is shown in FIG. 7.
The cryogenic treatment can induce the formation of GP zones in the alloy and influence the appearance of precipitated phases in the crystal after aging. As can be seen from the following figures, after the treatment by the technology, the precipitated phases in the alloy crystal are increased, which is the main reason for maintaining and even improving the mechanical property of the alloy; the grain boundary morphology of the alloy is the decisive factor for the corrosion resistance of the alloy. Although the precipitated phases at the grain boundaries of the alloy after the Retrogression and reading treatment (RRA) are discontinuously distributed in a chain shape, the sizes and the intervals of the precipitated phases are small, as shown in fig. 2. When the cryogenic treatment is applied before solid solution, the shape change of the alloy grain boundary is not large, which shows that the effect is not obvious when the cryogenic treatment is applied before high-temperature aging, as shown in figure 3. When the cryogenic treatment is applied to the solid solution, as shown in figure 4, more vacancies exist in the alloy after the cryogenic treatment to promote the segregation of solute atoms, and sufficient time is provided for the growth and aggregation in the regression and re-aging process, so that large-size precipitated phases on grain boundaries are increased. As shown in FIG. 5, the continuous grain boundary precipitated phase formed by pre-aging is broken and disconnected at very low temperature, the disconnected precipitated phase continues to grow up at subsequent high temperature aging, and the precipitated phase spacing is large and uneven distribution. After the regression, the deep cooling is performed, as shown in fig. 6, the grain boundary precipitated phase which is primarily broken after the regression is further broken in the deep cooling process, the larger precipitated phase is formed, the uniform grain boundary precipitated phase is formed, the grain boundary precipitated phase grows in the re-aging process, and finally the grain boundary is uniformly distributed. Meanwhile, because no precipitate is precipitated in the state, the corrosion resistance of the alloy is obviously improved. The cryogenic treatment after the re-aging is performed as shown in FIG. 7, the grain boundary precipitated phases of the alloy after RRA are crushed and grown by the cryogenic treatment, and thus the precipitated phase spacing is reduced but smaller than the cryogenic treatment after the solid solution.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (6)
1. An aluminum alloy regression and reaging and deep cooling treatment combined corrosion-resistant strengthening process is provided, and the aluminum alloy is suitable for a heat-treatable strengthened aluminum alloy 7 series; the method is characterized by comprising the following steps:
firstly, polishing the aluminum alloy to have metallic luster by using abrasive paper;
step two, heating the box-type resistance furnace to the temperature of 450-470 ℃, putting the 7xxx series aluminum alloy into the furnace after the temperature is stable, carrying out solid solution treatment on the aluminum alloy, wherein the solid solution treatment time is 1-2h, monitoring the furnace temperature through a potential difference meter, and controlling the error of the furnace temperature to be +/-2 ℃; carrying out quenching treatment, wherein deionized water with the temperature of 0-5 ℃ is used, and the transfer time is within 2 s;
step three, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12-16h at the temperature of 100-;
step four, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 8-20min at the temperature of 180-;
step five, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12-16h at the temperature of 100-;
step six, air cooling is carried out to obtain the traditional heat treatment aluminum alloy;
the steps also comprise a cryogenic treatment step: taking liquid nitrogen as a medium, and preserving the heat of the aluminum alloy obtained in the previous step at the temperature of-196 ℃ for 10-16 h;
wherein the step of the cryogenic treatment is placed after any one of the steps one to five, and the step of the cryogenic treatment is only required to be performed once in each case.
2. The corrosion-resistant strengthening process combining aluminum alloy regression re-aging and cryogenic treatment according to claim 1, characterized in that: the method comprises the following steps:
firstly, polishing the aluminum alloy to have metallic luster by using abrasive paper;
step two, heating the box-type resistance furnace to the temperature of 450-470 ℃, putting the 7xxx series aluminum alloy into the furnace after the temperature is stable, carrying out solid solution treatment on the aluminum alloy, wherein the solid solution treatment time is 1-2h, monitoring the furnace temperature through a potential difference meter, and controlling the error of the furnace temperature to be +/-2 ℃; carrying out quenching treatment, wherein deionized water with the temperature of 0-5 ℃ is used, and the transfer time is within 2 s;
step three, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 12-16h at the temperature of 100-;
step four, placing the mixture into a digital display air-blast drying oven for aging treatment, and preserving heat for 8-20min at the temperature of 180-;
step five, cryogenic treatment: keeping the temperature at-196 deg.C for 10-16h with liquid nitrogen as medium;
sixthly, placing the mixture into a digital display air-blast drying box for aging treatment, and preserving heat for 12-16h at the temperature of 100-;
and seventhly, performing air cooling to obtain the traditional heat-treated aluminum alloy.
3. The corrosion-resistant strengthening process combining the aluminum alloy regression re-aging and the cryogenic treatment according to claim 1 or 2, characterized in that: in the first step, sand paper is used for polishing, the sand paper is 240-2000 meshes, polishing paste is used for polishing, and the polishing paste is 1000-8000 meshes.
4. The corrosion-resistant strengthening process combining the aluminum alloy regression re-aging and the cryogenic treatment according to claim 1 or 2, characterized in that: the aluminum alloy workpiece is a 7xxx series aluminum alloy, and the alloy quality components are as follows: 0.2 to 0.4 percent of silicon, 0.1 to 0.5 percent of iron, 1.2 to 2.0 percent of copper, 0.2 to 0.3 percent of manganese, 2.5 to 3.5 percent of magnesium, 0.18 to 0.25 percent of chromium, 5.8 to 7.5 percent of zinc, 0.16 to 0.20 percent of titanium and the balance of aluminum.
5. The corrosion-resistant strengthening process combining the aluminum alloy regression re-aging and the cryogenic treatment according to claim 1 or 2, characterized in that: deionized water was used for quenching.
6. The corrosion-resistant strengthening process combining the aluminum alloy regression re-aging and the cryogenic treatment according to claim 1 or 2, characterized in that: the thickness of the aluminum alloy workpiece is 0.5mm-20mm, and the temperature of liquid nitrogen is-196 ℃.
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| CN114737142A (en) * | 2022-06-13 | 2022-07-12 | 中国航发北京航空材料研究院 | Low-stress corrosion-resistant preparation method for aluminum alloy casting through vibratory aging and cryogenic treatment |
| CN115341123A (en) * | 2022-08-22 | 2022-11-15 | 襄阳金耐特机械股份有限公司 | Aluminum alloy and preparation method thereof |
| CN115341160A (en) * | 2022-08-22 | 2022-11-15 | 襄阳金耐特机械股份有限公司 | Aluminum alloy heat treatment method and aluminum alloy prepared by same |
| CN115386816A (en) * | 2022-08-30 | 2022-11-25 | 沈阳工业大学 | Cryogenic re-aging strengthening treatment process for aluminum alloy |
| CN115572923A (en) * | 2022-09-09 | 2023-01-06 | 北京航空航天大学 | Method for obtaining non-isothermal aging system of aluminum alloy based on in-situ resistance measurement |
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| CN115386816A (en) * | 2022-08-30 | 2022-11-25 | 沈阳工业大学 | Cryogenic re-aging strengthening treatment process for aluminum alloy |
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