CN113462911B - Preparation method of tough corrosion-resistant AZ80 magnesium alloy - Google Patents
Preparation method of tough corrosion-resistant AZ80 magnesium alloy Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 83
- 238000005260 corrosion Methods 0.000 title claims abstract description 50
- 230000007797 corrosion Effects 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000001125 extrusion Methods 0.000 claims abstract description 39
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 claims abstract description 33
- 230000008021 deposition Effects 0.000 claims abstract description 32
- 238000000889 atomisation Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000000151 deposition Methods 0.000 claims description 32
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000000265 homogenisation Methods 0.000 claims description 19
- 238000005507 spraying Methods 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 11
- 239000003792 electrolyte Substances 0.000 claims description 11
- 239000011777 magnesium Substances 0.000 claims description 9
- 229910004835 Na2B4O7 Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 229910020489 SiO3 Inorganic materials 0.000 claims description 6
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 abstract description 22
- 239000000956 alloy Substances 0.000 abstract description 22
- 238000007654 immersion Methods 0.000 abstract description 9
- 239000000919 ceramic Substances 0.000 abstract description 8
- 239000013078 crystal Substances 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 7
- 238000005204 segregation Methods 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 16
- 238000004140 cleaning Methods 0.000 description 12
- 238000005498 polishing Methods 0.000 description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 6
- 238000000227 grinding Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 5
- 239000003350 kerosene Substances 0.000 description 5
- 239000004744 fabric Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 238000009763 wire-cut EDM Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- -1 steel Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
-
- 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
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/30—Anodisation of magnesium or alloys based thereon
Abstract
The invention belongs to the technical field of magnesium alloy, and provides a preparation method of a tough corrosion-resistant AZ80 magnesium alloy. The method adopts atomization deposition treatment to avoid dendritic crystal segregation and coarse structure of the alloy; the equal channel angle extrusion deformation is adopted to refine the crystal grains, the toughness of the material is improved, and the ultra-fine grain microstructure formed after the equal channel angle extrusion deformation can improve the film forming process of micro-arc oxidation treatment and improve the compactness of an oxide film on the surface of the alloy; and a ceramic layer is formed on the surface of the AZ80 magnesium alloy by adopting micro-arc oxidation treatment, so that the corrosion resistance of the alloy is improved. The results of the examples show that the AZ80 magnesium alloy provided by the invention has the tensile strength of 347MPa, the tensile elongation at break of 12.5 percent and the full immersion corrosion rate of 3.5 multiplied by 10‑4mg·cm‑ 2h‑1。
Description
Technical Field
The invention relates to the technical field of magnesium alloys, in particular to a preparation method of a tough corrosion-resistant AZ80 magnesium alloy.
Background
In the existing metal materials for engineering, magnesium alloy is regarded as a green engineering material in the 21 st century as one of the lightest metal structural materials, and meanwhile, the magnesium alloy also has the advantages of higher specific strength and specific rigidity, good castability and dimensional stability, high damping, good electromagnetic interference shielding performance, high recycling rate and the like, and is widely applied to the fields of aerospace, electronic communication, vehicle manufacturing, national defense science and technology and the like.
The AZ80 magnesium alloy shows excellent mechanical properties as one of magnesium alloys, however, compared with metals such as steel, aluminum alloy and the like, due to the special close-packed hexagonal lattice structure of the magnesium alloy, the slip system which can be started during room temperature forming is very limited, so that the magnesium alloy has poor toughness and low strength in room temperature environment, is difficult to deform, and further severely restricts the development of the AZ80 magnesium alloy, so that the development of the high-performance AZ80 magnesium alloy has important significance.
Meanwhile, the magnesium has more active chemical properties, and the standard electrode potential is-2.37V, so that even if an oxide film is generated on the surface of the AZ80 magnesium alloy in a natural environment, the corrosion of a metal matrix in severe environments such as high-temperature and high-salt fog and the like cannot be effectively protected, and the application of the AZ80 magnesium alloy in the industry is limited.
Disclosure of Invention
The invention aims to provide a preparation method of a tough and corrosion-resistant AZ80 magnesium alloy, and the AZ80 magnesium alloy prepared by the preparation method provided by the invention has good strength and toughness and excellent corrosion resistance.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a preparation method of a tough corrosion-resistant AZ80 magnesium alloy, which comprises the following steps:
(1) carrying out spray atomization deposition treatment on the AZ80 magnesium alloy melt to obtain a deposition AZ80 magnesium alloy billet;
(2) and (2) sequentially carrying out homogenization treatment, equal channel angle extrusion deformation and micro-arc oxidation treatment on the deposition AZ80 magnesium alloy billet obtained in the step (1) to obtain the tough corrosion-resistant AZ80 magnesium alloy.
Preferably, the spraying temperature of the spraying atomization deposition treatment in the step (1) is 740-760 ℃, and the spraying angle is 10-30 degrees.
Preferably, the atomization pressure of the spraying atomization deposition treatment in the step (1) is 0.5-0.7 MPa, and the gas-liquid flow rate ratio is 1.6-1.8.
Preferably, the rotating speed of the receiving tray for the spray atomization deposition treatment in the step (1) is 30-60 rpm, and the descending speed of the receiving tray is 2-5 mm/s.
Preferably, the temperature of the homogenization treatment in the step (2) is 360-400 ℃, and the time of the homogenization treatment is 12-16 h.
Preferably, the temperature of the channel angular extrusion deformation in the step (2) is 250-300 ℃, the speed is 2-4 mm/min, and the pass is 6, 10 or 12 times.
Preferably, the process route of the equal channel angular extrusion deformation in the step (2) is BCThe back pressure is 160-180 MPa.
Preferably, the voltage applied during the micro-arc oxidation treatment in the step (2) is 380-420V, the duty ratio is 15-30%, the frequency is 400-600 Hz, and the time is 20-25 min.
Preferably, the electrolyte for the micro-arc oxidation treatment in the step (2) comprises: na (Na)2SiO3 15～20g/L，NaOH 25～30g/L，Na2B4O725-30 g/L and 4g/L of magnetic nickel powder.
Preferably, the AZ80 magnesium alloy in the step (1) includes the following components by mass percent: 7.89-8.85% of Al, 0.39-0.50% of Zn, 0.23-0.50% of Mn, 0.05-0.1% of Cu, 0.02-0.05% of Si, 0.01-0.03% of Fe and the balance of Mg.
The invention provides a preparation method of a tough corrosion-resistant AZ80 magnesium alloy, which comprises the following steps: carrying out spray atomization deposition treatment on the AZ80 magnesium alloy melt to obtain a deposition AZ80 magnesium alloy billet; and (3) carrying out homogenization treatment, equal channel angle extrusion deformation and micro-arc oxidation treatment on the deposition AZ80 magnesium alloy billet in sequence to obtain the tough corrosion-resistant AZ80 magnesium alloy. The method avoids dendritic crystal segregation and coarse structure of the alloy by adopting atomization deposition treatment, also avoids the contact of the alloy and oxygen, and reduces the oxidation degree of the alloy; the equal channel angular extrusion deformation is adopted to refine crystal grains and improve the toughness of the material, and the ultra-fine grain microstructure formed after the equal channel angular extrusion deformation can improve the film forming process of micro-arc oxidation treatment and improve the compactness of an oxide film on the surface of the alloy; a ceramic layer is formed on the surface of the AZ80 magnesium alloy through micro-arc oxidation treatment, and the surface of the ceramic layer is of a micron-sized porous structure, so that the corrosion resistance of the alloy is improved. The results of the examples show that the AZ80 magnesium alloy provided by the invention has the tensile strength of 347MPa, the tensile elongation at break of 12.5 percent and the full immersion corrosion rate of 3.5 multiplied by 10-4mg·cm-2h-1Corrosion ofThe current density is 0.7041 mu A/cm2The impedance value was 8082000ohms · cm2。
Detailed Description
The invention provides a preparation method of a tough corrosion-resistant AZ80 magnesium alloy, which comprises the following steps:
(1) carrying out spray atomization deposition treatment on the AZ80 magnesium alloy melt to obtain a deposition AZ80 magnesium alloy billet;
(2) and (2) sequentially carrying out homogenization treatment, equal channel angle extrusion deformation and micro-arc oxidation treatment on the deposition AZ80 magnesium alloy billet obtained in the step (1) to obtain the tough corrosion-resistant AZ80 magnesium alloy.
The invention carries out spray atomization deposition treatment on AZ80 magnesium alloy melt to obtain a deposition AZ80 magnesium alloy billet. The method avoids dendritic crystal segregation and coarse structure of the alloy by adopting atomization deposition treatment, also avoids the contact of the alloy and oxygen, reduces the oxidation degree of the alloy, is beneficial to improving the strength and the corrosion resistance of the alloy, has simple working procedure and low cost, and improves the production efficiency.
The invention does not specially limit the composition and the source of the AZ80 magnesium alloy, and the preparation method of the tough and corrosion-resistant AZ80 magnesium alloy provided by the invention is suitable for AZ80 magnesium alloy which is well known by persons skilled in the art. In the invention, the AZ80 magnesium alloy preferably comprises the following components in percentage by mass: 7.89-8.85% of Al, 0.39-0.50% of Zn, 0.23-0.50% of Mn, 0.05-0.1% of Cu, 0.02-0.05% of Si, 0.01-0.03% of Fe, and the balance of Mg, more preferably 7.89% of Al, 0.39% of Zn, 0.23% of Mn, 0.05% of Cu, 0.02% of Si, 0.01% of Fe, and the balance of Mg.
In the invention, the spraying temperature of the spraying atomization deposition treatment is preferably 740-760 ℃, and more preferably 750-760 ℃; the spraying angle is preferably 10-30 degrees, and more preferably 20-30 degrees; the atomizing medium is preferably high-purity nitrogen; the atomization pressure is preferably 0.5-0.7 MPa, and more preferably 0.6-0.7 MPa; the gas-liquid flow rate ratio is preferably 1.6-1.8, and more preferably 1.6; the rotating speed of the receiving disc is preferably 30-60 rpm, and more preferably 50-60 rpm; the descending speed of the receiving tray is preferably 2-5 mm/s, and more preferably 4-5 mm/s. The invention preferably controls the technological parameters of the spray atomization deposition treatment in the range, which is favorable for obtaining the densified AZ80 magnesium alloy billet with uniform structure.
After the spray atomization deposition treatment is completed, the invention preferably removes the skin and the flash of the AZ80 magnesium alloy ingot in the deposition state and produces the ingot with the size of 18mm multiplied by 60 mm. In the present invention, the method for producing the ingot is preferably wire electrical discharge machining.
After the deposition-state AZ80 magnesium alloy billet is obtained, the invention sequentially carries out homogenization treatment, equal channel angular extrusion deformation and micro-arc oxidation treatment on the deposition-state AZ80 magnesium alloy billet to obtain the tough corrosion-resistant AZ80 magnesium alloy.
In the invention, the temperature of the homogenization treatment is preferably 360-400 ℃, and more preferably 380-390 ℃; the time for the homogenization treatment is preferably 12 to 16 hours, and more preferably 14 to 15 hours. The specific operation of the homogenization treatment in the present invention is not particularly limited, and the homogenization treatment technique known to those skilled in the art may be employed. The invention homogenizes the components of the alloy ingot through homogenization treatment, and eliminates component segregation and structural nonuniformity.
Preferably, the AZ80 magnesium alloy after the homogenization treatment is placed in an equal channel angle extrusion deformation die lubricated by a lubricant for heat preservation treatment, and then equal channel angle extrusion deformation is carried out. In the present invention, the lubricant preferably comprises molybdenum disulfide or a mixture of graphite powder and kerosene, more preferably a mixture of graphite powder and kerosene; the temperature of the heat preservation treatment is preferably 150-300 ℃, and more preferably 230-280 ℃; the time of the heat preservation treatment is preferably 10-20 min, and more preferably 20 min.
In the invention, the temperature of the equal channel angular extrusion deformation is preferably 250-300 ℃, and more preferably 250-280 ℃; the speed of the equal channel angular extrusion deformation is preferably 2-4 mm/min, and more preferably 2 mm/min. In the invention, the equal channel angular extrusion deformation is too fast and easy to crack, and the energy is wasted due to too slow speed. In the present invention, the number of passes of the equal channel angular extrusion deformation is preferably 6, 10 or 12, and more preferably 10 or 12. In the invention, the pass of the equal channel angular extrusion deformation is preferably controlled in the range, which is beneficial to improving the uniformity of the structure. The invention adopts equal channel angular extrusion deformation to refine crystal grains and improve the toughness of the material, and the ultrafine grain microstructure formed after the equal channel angular extrusion deformation can improve the film forming process of micro-arc oxidation treatment, improve the compactness of an oxide film on the surface of the alloy and further improve the corrosion resistance of the AZ80 magnesium alloy.
In the invention, the process route of the equal channel angular extrusion deformation is preferably BC(ii) a The invention adopts Bc process route, and the sample rotates 90 degrees between adjacent extrusion passes, which is beneficial to improving the uniformity of the tissue. In the invention, the back pressure of the equal channel angular extrusion deformation is preferably 160-180 MPa, and more preferably 170-180 MPa. In the invention, the back pressure of the equal channel angular extrusion deformation is used for adjusting the pressure balance in the die and controlling the pressure balance in the range, which is beneficial to ensuring that the plastic deformation is more stable.
According to the invention, the AZ80 magnesium alloy after the equal channel angle extrusion deformation is preferably subjected to cutting, grinding, polishing and cleaning in sequence, and then subjected to micro-arc oxidation treatment. The cutting, grinding, polishing and cleaning operations are not particularly limited in the present invention, and may be performed by using cutting, grinding, polishing and cleaning solutions well known to those skilled in the art. In the present invention, the size of the cut is preferably 12mm × 12mm × 12 mm; the polishing is preferably performed to 1600# step by using sand paper; the polished material is preferably polishing cloth; the cleaning is preferably performed by using acetone firstly and then absolute ethyl alcohol; the absolute ethyl alcohol cleaning is preferably carried out under the ultrasonic condition, and the absolute ethyl alcohol cleaning time is preferably 15-20 min.
In the invention, the applied voltage of the micro-arc oxidation treatment is preferably 380-420V, and more preferably 400-420V; the duty ratio is preferably 15-30%, and more preferably 20-25%; the frequency is preferably 400-600 Hz, and more preferably 550-600 Hz; the time is preferably 20-25 min, and more preferably 25 min. In the invention, the micro-arc oxidation treatment has over-high voltage and over-long time, and the over-corrosion is more serious, which is unfavorable for the strength and the corrosion resistance of the alloy. The specific operation of the micro-arc oxidation treatment is not particularly limited, and the technical scheme of the micro-arc oxidation treatment known to those skilled in the art can be adopted. According to the invention, the ceramic layer is formed on the surface of the AZ80 magnesium alloy by adopting micro-arc oxidation treatment, and the surface of the ceramic layer is of a micron-sized porous structure, so that the corrosion resistance of the alloy is improved.
In the present invention, the composition of the electrolyte for the micro-arc oxidation treatment preferably includes: na (Na)2SiO3 15～20g/L，NaOH 25～30g/L，Na2B4O725-30 g/L and 4g/L of magnetic nickel powder, more preferably Na2SiO3 20g/L，NaOH 25g/L，Na2B4O725g/L and 4g/L of magnetic nickel powder. In the invention, NaOH is used as the main component of the electrolyte, Na2SiO3、Na2B4O7And the addition of the magnetic nickel powder is beneficial to improving the corrosion resistance of the micro-arc oxidation ceramic layer, so that the corrosion resistance of the AZ80 magnesium alloy is improved. The electrolyte is preferably adopted for micro-arc oxidation treatment, and the higher the concentration of the corrosive liquid is, the more the corrosion is, and the fracture along the grain boundary is easy to occur. In the invention, the AZ80 magnesium alloy is used as an anode and is connected with a micro-arc oxidation power supply, and the cathode is preferably a stainless steel plate.
According to the preparation method provided by the invention, the AZ80 magnesium alloy melt is subjected to spray atomization deposition treatment, and then homogenization treatment, equal channel angle extrusion deformation and micro-arc oxidation treatment are sequentially carried out, so that the tough and corrosion-resistant AZ80 magnesium alloy is obtained. The method avoids dendritic crystal segregation and coarse structure of the alloy by adopting atomization deposition treatment, also avoids the contact of the alloy and oxygen, and reduces the oxidation degree of the alloy; the equal channel angular extrusion deformation is adopted to refine crystal grains and improve the toughness of the material, and the ultra-fine grain microstructure formed after the equal channel angular extrusion deformation can improve the film forming process of micro-arc oxidation treatment and improve the compactness of an oxide film on the surface of the alloy; a ceramic layer is formed on the surface of the AZ80 magnesium alloy through micro-arc oxidation treatment, and the surface of the ceramic layer is of a micron-sized porous structure, so that the corrosion resistance of the alloy is improved.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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
(1) Carrying out spray atomization deposition treatment on the AZ80 magnesium alloy melt to obtain a deposition AZ80 magnesium alloy billet; wherein the spraying temperature is 760 ℃, the spraying angle is 30 ℃, the atomizing medium is high-purity nitrogen, the atomizing pressure is 0.6MPa, the rotating speed of a receiving disc is 50rpm, the descending speed of the receiving disc is 4mm/s, the gas-liquid flow rate ratio is 1.6, and the AZ80 magnesium alloy comprises the following components in percentage by mass: 7.89% of Al, 0.39% of Zn, 0.23% of Mn, 0.05% of Cu, 0.02% of Si, 0.01% of Fe and the balance of Mg.
(2) Removing the skin and the flash of the deposition-state AZ80 magnesium alloy billet obtained in the step (1), preparing the billet with the size of 18mm multiplied by 60mm by a wire electrical discharge machining method, then carrying out homogenization treatment at 390 ℃ for 14h, placing the billet after being polished smooth into an equal channel angle extrusion deformation die lubricated by a mixture of graphite powder and kerosene, heating the billet to 230 ℃ along with a furnace, preserving the heat for 20min, and then applying 180MPa pressure to carry out continuous 6-pass equal channel angle extrusion deformation, wherein the deformation temperature is 250 ℃, and the deformation speed is 2 mm/min; the tensile strength at room temperature is 321MPa, the elongation at break is 14 percent, and the total immersion corrosion rate is 4.1mg cm-2h-1The corrosion current density is 133 mu A/cm2The impedance value is 350ohms · cm2。
(3) Cutting the AZ80 magnesium alloy subjected to equal channel angle extrusion deformation treatment in the step (2) into cubic test pieces with the size of 12mm multiplied by 12mm, grinding sand paper to 1600# step by step, polishing with polishing cloth, cleaning the surface with acetone, ultrasonically cleaning in absolute ethyl alcohol for 15min, putting into electrolyte, connecting the cubic test pieces as anodes with a micro-arc oxidation power supply, connecting a stainless steel plate with the power supply as cathodes, applying an external voltage of 420V, a duty ratio of 25%, a frequency of 600Hz, and performing micro-arc oxidation treatment for 25min to obtain the tough corrosion-resistant AZ80 magnesium alloy; wherein the electrolyte compositionComprises the following steps: na (Na)2SiO3 20g/L，NaOH 25g/L，Na2B4O725g/L of magnetic nickel powder body, 4g/L of magnetic nickel powder body; the tensile strength at room temperature is 321MPa, the elongation at break is 14 percent, and the full immersion corrosion rate is 3.3 multiplied by 10-4mg·cm-2h-1The corrosion current density is 0.6894 mu A/cm2The impedance value was 7895000ohms · cm2。
Example 2
(1) Carrying out spray atomization deposition treatment on the AZ80 magnesium alloy melt to obtain a deposition AZ80 magnesium alloy billet; wherein the spraying temperature is 760 ℃, the spraying angle is 30 ℃, the atomizing medium is high-purity nitrogen, the atomizing pressure is 0.6MPa, the rotating speed of a receiving disc is 50rpm, the descending speed of the receiving disc is 4mm/s, the gas-liquid flow rate ratio is 1.6, and the AZ80 magnesium alloy comprises the following components in percentage by mass: 7.89% of Al, 0.39% of Zn, 0.23% of Mn, 0.05% of Cu, 0.02% of Si, 0.01% of Fe and the balance of Mg.
(2) Removing the skin and the flash of the deposition-state AZ80 magnesium alloy billet obtained in the step (1), preparing the billet with the size of 18mm multiplied by 60mm by a wire electrical discharge machining method, then carrying out homogenization treatment at 390 ℃ for 14h, placing the billet after being polished smooth into an equal channel angle extrusion deformation die lubricated by a mixture of graphite powder and kerosene, heating the billet to 230 ℃ along with a furnace, preserving the heat for 20min, then applying 180MPa pressure to carry out continuous 10-pass equal channel angle extrusion deformation, wherein the deformation temperature is 250 ℃, and the deformation speed is 2 mm/min; the measured room temperature tensile strength is 334MPa, the tensile elongation at break is 13 percent, and the full immersion corrosion rate is 4.5mg cm-2h-1The corrosion current density is 137 mu A/cm2The impedance value is 366ohms · cm2。
(3) Cutting the AZ80 magnesium alloy subjected to equal channel angle extrusion deformation treatment in the step (2) into cubic test pieces with the size of 12mm multiplied by 12mm, grinding the cubic test pieces to 1600# step by using abrasive paper, polishing the cubic test pieces by using polishing cloth, cleaning the surfaces of the cubic test pieces by using acetone, ultrasonically cleaning the cubic test pieces in absolute ethyl alcohol for 15min, putting the cubic test pieces into electrolyte, connecting the cubic test pieces as anodes with a micro-arc oxidation power supply, connecting a stainless steel plate with the power supply as cathodes, applying an external voltage of 420V, a duty ratio of 25%, a frequency of 600Hz, and performing micro-arc oxidation treatment for 25min to obtain the tough magnesium alloyCorrosion resistant AZ80 magnesium alloy; wherein, the electrolyte comprises the following components: na (Na)2SiO3 20g/L，NaOH 25g/L，Na2B4O725g/L of magnetic nickel powder body, 4g/L of magnetic nickel powder body; the measured room temperature tensile strength is 334MPa, the tensile elongation at break is 13 percent, and the full immersion corrosion rate is 3.6 multiplied by 10-4mg·cm-2h-1The corrosion current density is 0.6984 mu A/cm2The impedance value was 8012000ohms · cm2。
Example 3
(1) Carrying out spray atomization deposition treatment on the AZ80 magnesium alloy melt to obtain a deposition AZ80 magnesium alloy billet; wherein the spraying temperature is 760 ℃, the spraying angle is 30 ℃, the atomizing medium is high-purity nitrogen, the atomizing pressure is 0.6MPa, the rotating speed of a receiving disc is 50rpm, the descending speed of the receiving disc is 4mm/s, the gas-liquid flow rate ratio is 1.6, and the AZ80 magnesium alloy comprises the following components in percentage by mass: 7.89% of Al, 0.39% of Zn, 0.23% of Mn, 0.05% of Cu, 0.02% of Si, 0.01% of Fe and the balance of Mg.
(2) Removing the skin and the flash of the deposition-state AZ80 magnesium alloy billet obtained in the step (1), preparing the billet with the size of 18mm multiplied by 60mm by a wire electrical discharge machining method, then carrying out homogenization treatment at 390 ℃ for 14h, placing the billet after being polished smooth into an equal channel angle extrusion deformation die lubricated by a mixture of graphite powder and kerosene, heating the billet to 230 ℃ along with a furnace, preserving the heat for 20min, and then applying 180MPa pressure to carry out continuous 12-pass equal channel angle extrusion deformation, wherein the deformation temperature is 250 ℃, and the deformation speed is 2 mm/min; measured room temperature tensile strength is 347MPa, tensile elongation at break is 12.5%, and the total immersion corrosion rate is 4.4mg cm-2h-1The corrosion current density is 138 mu A/cm2The impedance value is 380ohms · cm2。
(3) Cutting the AZ80 magnesium alloy subjected to equal channel angle extrusion deformation treatment in the step (2) into cubic test pieces with the size of 12mm multiplied by 12mm, grinding the cubic test pieces to 1600# step by using abrasive paper, polishing the cubic test pieces by using polishing cloth, cleaning the surfaces of the cubic test pieces by using acetone, ultrasonically cleaning the cubic test pieces in absolute ethyl alcohol for 15min, putting the cubic test pieces into electrolyte, connecting the cubic test pieces as anodes with a micro-arc oxidation power supply, connecting a stainless steel plate with the power supply as cathodes, applying a voltage of 400V, controlling the duty ratio to be 20%, and controlling the frequencyThe temperature is 550Hz, and after micro-arc oxidation treatment is carried out for 25min, the tough and corrosion-resistant AZ80 magnesium alloy is prepared; wherein, the electrolyte comprises the following components: na (Na)2SiO3 20g/L，NaOH 25g/L，Na2B4O725g/L of magnetic nickel powder body, 4g/L of magnetic nickel powder body; measured room temperature tensile strength is 347MPa, tensile elongation at break is 12.5 percent, and the total immersion corrosion rate is 3.5 multiplied by 10-4mg·cm-2h-1The corrosion current density is 0.7041 mu A/cm2The impedance value was 8082000ohms · cm2。
The embodiment shows that the tough corrosion-resistant AZ80 magnesium alloy prepared by the preparation method provided by the invention has good strength and toughness and excellent corrosion resistance; the tensile strength of the alloy at room temperature is 347MPa, the tensile elongation at break is 12.5 percent, and the total immersion corrosion rate is 3.5 multiplied by 10-4mg·cm-2h-1The corrosion current density is 0.7041 mu A/cm2The impedance value was 8082000ohms · cm2。
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A preparation method of a tough corrosion-resistant AZ80 magnesium alloy comprises the following steps:
(1) carrying out spray atomization deposition treatment on the AZ80 magnesium alloy melt to obtain a deposition AZ80 magnesium alloy billet; the spraying temperature of the spraying, atomizing and depositing treatment is 740-760 ℃, the spraying angle is 10-30 degrees, the atomizing pressure is 0.5-0.7 MPa, the gas-liquid flow rate ratio is 1.6-1.8, the rotating speed of the receiving disc is 30-60 rpm, and the descending speed of the receiving disc is 2-5 mm/s;
the AZ80 magnesium alloy comprises the following components in percentage by mass: 7.89-8.85% of Al, 0.39-0.50% of Zn, 0.23-0.50% of Mn, 0.05-0.1% of Cu, 0.02-0.05% of Si, 0.01-0.03% of Fe and the balance of Mg;
(2) carrying out homogenization treatment, equal channel angle extrusion deformation and micro-arc oxidation treatment on the deposition AZ80 magnesium alloy billet obtained in the step (1) in sequence to obtain a tough corrosion-resistant AZ80 magnesium alloy; the temperature of the homogenization treatment is 360-400 ℃, and the time of the homogenization treatment is 12-16 h; the temperature of the equal channel angular extrusion deformation is 250-300 ℃, the speed is 2-4 mm/min, and the number of passes is 6, 10 or 12.
2. The method according to claim 1, wherein the process route of the equal channel angular extrusion deformation in the step (2) is BCThe back pressure is 160-180 MPa.
3. The preparation method according to claim 1, wherein the applied voltage of the micro-arc oxidation treatment in the step (2) is 380-420V, the duty ratio is 15-30%, the frequency is 400-600 Hz, and the time is 20-25 min.
4. The preparation method according to claim 1 or 3, wherein the electrolyte composition of the micro-arc oxidation treatment in the step (2) comprises: na (Na)2SiO3 15~20g/L，NaOH 25~30g/L，Na2B4O7 25-30 g/L and 4g/L of magnetic nickel powder.
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