CN112144090A - Low-energy-consumption micro-arc oxidation method for magnesium alloy surface - Google Patents
Low-energy-consumption micro-arc oxidation method for magnesium alloy surface Download PDFInfo
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- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 title claims abstract description 131
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 82
- 238000005265 energy consumption Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 40
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 33
- 239000000919 ceramic Substances 0.000 claims abstract description 33
- 239000003792 electrolyte Substances 0.000 claims abstract description 24
- 239000011259 mixed solution Substances 0.000 claims abstract description 19
- 229910004835 Na2B4O7 Inorganic materials 0.000 claims abstract description 11
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 10
- 239000000654 additive Substances 0.000 claims abstract description 9
- 230000000996 additive effect Effects 0.000 claims abstract description 9
- 239000011775 sodium fluoride Substances 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000008367 deionised water Substances 0.000 claims abstract description 6
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 6
- 229910020350 Na2WO4 Inorganic materials 0.000 claims description 3
- HELHAJAZNSDZJO-OLXYHTOASA-L sodium L-tartrate Chemical compound [Na+].[Na+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O HELHAJAZNSDZJO-OLXYHTOASA-L 0.000 claims description 3
- 239000001509 sodium citrate Substances 0.000 claims description 3
- 239000001433 sodium tartrate Substances 0.000 claims description 3
- 229960002167 sodium tartrate Drugs 0.000 claims description 3
- 235000011004 sodium tartrates Nutrition 0.000 claims description 3
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910001868 water Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 101001108245 Cavia porcellus Neuronal pentraxin-2 Proteins 0.000 description 1
- 229910020489 SiO3 Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000000861 blow drying Methods 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 229910052634 enstatite Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- HRXKRNGNAMMEHJ-UHFFFAOYSA-K trisodium citrate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O HRXKRNGNAMMEHJ-UHFFFAOYSA-K 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention discloses a low-energy-consumption micro-arc oxidation method for a magnesium alloy surface, which comprises the following steps of: mixing NaOH and Na2SiO3、Na2B4O7Mixing NaF, additive and deionized water to make the concentration of NaOH in the mixed solution be 30-50 g/L, Na2SiO3The concentration of (A) is 20 g/L-40 g/L, Na2B4O7The concentration of the mixed solution is 20 g/L-25 g/L, NaF, the concentration of the mixed solution is 0.1 g/L-1 g/L, and then the pH value of the mixed solution is adjusted to 12-14, so that the low-energy-consumption micro-arc oxidation electrolyte is obtained; and placing the magnesium alloy workpiece in the low-energy-consumption micro-arc oxidation electrolyte for micro-arc oxidation treatment, thereby preparing a micro-arc oxidation ceramic layer on the surface of the magnesium alloy workpiece. The invention not only ensures that the prepared micro-arc oxidation ceramic layer has excellent performance, but also saves the energy loss of micro-arc oxidation, reduces the processing cost of micro-arc oxidation, has simple preparation process, is environment-friendly and has no pollution.
Description
Technical Field
The invention relates to the technical field of magnesium alloy surface treatment, in particular to a low-energy-consumption micro-arc oxidation method for a magnesium alloy surface.
Background
The magnesium alloy has the characteristics of lower density, better damping effect, higher specific strength and the like, and the processing and forming process is simple, so the magnesium alloy has wide application in the aspects of traffic, aerospace, war industry and the like.
The micro-arc oxidation technology is a surface treatment mode for growing a ceramic layer on the surface of light metal in situ by utilizing the instantaneous high-temperature sintering action of a micro-arc area. The ceramic layer prepared by the method has good bonding force with a substrate, high surface hardness and good wear resistance and corrosion resistance, so the micro-arc oxidation technology is one of the most main surface treatment modes of the magnesium alloy. However, the traditional micro-arc oxidation works under high voltage which is usually as high as hundreds of volts, which causes relatively high energy cost; for example, the energy cost of the micro-arc oxidation coating on the aluminum alloy is 20-50 times that of the traditional anodic oxidation. Therefore, a method for reducing the energy consumption of micro-arc oxidation is urgently needed to reduce the processing cost of micro-arc oxidation of the surface of the magnesium alloy.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a low-energy-consumption micro-arc oxidation method for the surface of magnesium alloy, which can reduce the micro-arc oxidation working voltage from more than 300V to less than 180V under the same current density, so that the prepared micro-arc oxidation ceramic layer has excellent performance, the surface performance of the magnesium alloy is improved, the energy consumption of micro-arc oxidation is saved, the processing cost of micro-arc oxidation is reduced, the preparation process is simple, and the method is environment-friendly and pollution-free.
The purpose of the invention is realized by the following technical scheme:
a low-energy-consumption micro-arc oxidation method for the surface of magnesium alloy comprises the following steps:
step 1, preparing low-energy-consumption micro-arc oxidation electrolyte: mixing NaOH and Na2SiO3、Na2B4O7Mixing NaF, additive and deionized water to make the concentration of NaOH in the mixed solution be 30-50 g/L, Na2SiO3The concentration of (A) is 20 g/L-40 g/L, Na2B4O7The concentration of the mixed solution is 20 g/L-25 g/L, NaF and 0.1 g/L-1 g/L, and then the pH value of the mixed solution is adjusted to 12-14, so that the low-energy-consumption micro-arc oxidation electrolyte is obtained. Wherein the additive is Na2WO4At least one of sodium citrate and sodium tartrate.
Step 2, low-energy-consumption micro-arc oxidation treatment: and (3) placing the magnesium alloy workpiece in the low-energy-consumption micro-arc oxidation electrolyte for micro-arc oxidation treatment, wherein the working voltage in the whole micro-arc oxidation process is not more than 180V, and then cleaning and drying the magnesium alloy workpiece, so that a micro-arc oxidation ceramic layer is prepared on the surface of the magnesium alloy workpiece.
Preferably, the processing parameters of the micro-arc oxidation treatment include: the power supply adopts a constant current mode, and the constant current density is 0.5A/dm2～3.0A/dm2The duty ratio is 30-50%, the frequency is 500-1000 Hz, and the micro-arc oxidation treatment time is 3-20 min.
Preferably, the magnesium alloy workpiece is firstly ground, polished, cleaned and dried, and then is placed in the low-energy-consumption micro-arc oxidation electrolyte for micro-arc oxidation treatment.
Preferably, the thickness of the micro-arc oxidation ceramic layer is 15-35 μm.
According to the technical scheme provided by the invention, the low-energy-consumption micro-arc oxidation method for the magnesium alloy surface comprises two processes of preparation of low-energy-consumption micro-arc oxidation electrolyte and low-energy-consumption micro-arc oxidation treatment, wherein the low-energy-consumption micro-arc oxidation electrolyte is NaOH and Na in a specific ratio2SiO3、Na2B4O7The NaF and the additive are main components, so that the voltage of a conventional micro-arc oxidation working area can be reduced from more than 400V to less than 180V under the same current density, and a micro-arc oxidation ceramic layer with excellent performance can be prepared on the surface of the magnesium alloy under the state of low energy consumption, so that the energy consumption is remarkably reduced, the load of a power grid is reduced, the production cost of micro-arc oxidation is saved, the preparation process is simple, the environment is protected, no pollution is caused, and the magnesium alloy micro-arc oxidation ceramic coating can be greatly improvedSurface property, expansion of magnesium alloy and use of micro-arc oxidation technology.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a low-energy-consumption micro-arc oxidation method for a magnesium alloy surface provided by the invention.
FIG. 2 is a macroscopic view of a micro-arc oxidation ceramic layer formed on the surface of AZ91 magnesium alloy in the embodiment 1 of the present invention.
FIG. 3 is a voltage-time curve diagram of the micro-arc oxidation process in the embodiment 1 of the present invention.
FIG. 4 is a surface morphology photograph of a micro-arc oxidized ceramic layer produced on the surface of AZ91 magnesium alloy in the embodiment 1 of the present invention.
FIG. 5 is a photograph showing the cross-sectional morphology of the micro-arc oxidized ceramic layer formed on the surface of the AZ91 magnesium alloy in example 1 of the present invention.
FIG. 6 is an XRD diffraction pattern of a micro-arc oxidized ceramic layer prepared on the surface of AZ91 magnesium alloy in the embodiment 1 of the invention.
FIG. 7 is an electrochemical polarization curve of a micro-arc oxidized ceramic layer formed on the surface of AZ91 magnesium alloy in the embodiment 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are 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 embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The method for the low-energy-consumption micro-arc oxidation of the surface of the magnesium alloy provided by the invention is described in detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
As shown in FIG. 1, a low-energy consumption micro-arc oxidation method for a magnesium alloy surface comprises the following steps:
step 1, preparing low-energy-consumption micro-arc oxidation electrolyte: mixing NaOH and Na2SiO3、Na2B4O7Mixing NaF, additive and deionized water to make the concentration of NaOH in the mixed solution be 30-50 g/L, Na2SiO3The concentration of (A) is 20 g/L-40 g/L, Na2B4O7The concentration of the mixed solution is 20 g/L-25 g/L, NaF and is 0.1 g/L-1 g/L, then ammonia water or acetic acid is used as a pH regulator, the pH value of the mixed solution is adjusted to 12-14, and the mixed solution is uniformly stirred, so that the low-energy-consumption micro-arc oxidation electrolyte is obtained.
Step 2, low-energy-consumption micro-arc oxidation treatment: pouring the low-energy-consumption micro-arc oxidation electrolyte into an electrolytic cell, and stirring at room temperature for 20-30 min; and (3) placing the magnesium alloy workpiece in the low-energy-consumption micro-arc oxidation electrolyte for micro-arc oxidation treatment, wherein the working voltage in the whole micro-arc oxidation process is not more than 180V, and then cleaning and drying the magnesium alloy workpiece, so that a micro-arc oxidation ceramic layer is prepared on the surface of the magnesium alloy workpiece.
Specifically, the low-energy-consumption micro-arc oxidation method for the surface of the magnesium alloy can comprise the following embodiments:
(1) the additive is Na2WO4Sodium citrate (Na)3C6H5O7) Sodium tartrate (C)4H4Na2O6) At least one of (1).
(2) The magnesium alloy workpiece can adopt magnesium alloy with the trade mark AZ91, and also can adopt magnesium alloy with the trade marks AM50, LA91 and AZ 31. In practical applications, the magnesium alloy workpiece may be obtained by primarily machining a magnesium alloy into a desired shape.
(3) And the magnesium alloy workpiece is firstly polished by sand paper, then sequentially polished, washed and dried, and then placed in the low-energy-consumption micro-arc oxidation electrolyte for micro-arc oxidation treatment.
(4) The processing parameters of the micro-arc oxidation treatment comprise: the power supply adopts a constant current mode, and the constant current density is 0.5A/dm2～3.0A/dm2The duty ratio is 30-50%, the frequency is 500-1000 Hz, and the micro-arc oxidation treatment time is 3-20 min.
(5) The washing and drying of the magnesium alloy workpiece may include: and taking the magnesium alloy workpiece subjected to micro-arc oxidation treatment out of the low-energy-consumption micro-arc oxidation electrolyte, cleaning the magnesium alloy workpiece by using clear water to remove the redundant low-energy-consumption micro-arc oxidation electrolyte, and then drying by using hot air.
(6) The thickness of the micro-arc oxidation ceramic layer is 15-35 mu m.
Further, the magnesium alloy surface low-energy consumption micro-arc oxidation method provided by the invention at least has the following advantages:
(1) the low-energy-consumption micro-arc oxidation method for the surface of the magnesium alloy can greatly reduce the energy consumption of micro-arc oxidation by controlling the components of the micro-arc oxidation electrolyte; to adopt a constant current density of 1A/dm2For example, the working voltage of the whole process of micro-arc oxidation is below 120V, and the electric power cost is saved by about 300%.
(2) The low-energy-consumption micro-arc oxidation electrolyte provided by the invention takes borate and silicate as main components, does not contain heavy metal elements, and is environment-friendly and pollution-free.
(3) Under the condition of the same current, the working voltage of the conventional micro-arc oxidation is above 300V, but the whole process of the working voltage of the micro-arc oxidation treatment in the magnesium alloy surface low-energy consumption micro-arc oxidation method provided by the invention is below 180V, so that the electric power cost can be obviously saved, and the load of a power grid of the micro-arc oxidation is reduced.
(4) The low-energy-consumption micro-arc oxidation method for the magnesium alloy surface can grow a micro-arc oxidation ceramic layer in situ on the magnesium alloy surface, and the thickness of the micro-arc oxidation ceramic layer is 15-35 mu m.
(5) The micro-arc oxidation ceramic layer grown in situ on the surface of the magnesium alloy by the low-energy-consumption micro-arc oxidation method for the surface of the magnesium alloy provided by the invention has strong adhesive force with the magnesium alloy matrix and is not easy to fall off.
(6) The low-energy-consumption micro-arc oxidation method for the surface of the magnesium alloy provided by the invention can greatly improve the corrosion resistance of the magnesium alloy, and the corrosion current density is reduced by more than 50% compared with that of a matrix.
(7) The magnesium alloy surface low-energy consumption micro-arc oxidation method provided by the invention can enable the surface hardness of the magnesium alloy to reach more than 300 HV/10.
In conclusion, the embodiment of the invention can reduce the micro-arc oxidation working voltage from more than 300V to less than 180V under the same current density, so that the prepared micro-arc oxidation ceramic layer has excellent performance, the surface performance of the magnesium alloy is improved, the energy consumption of micro-arc oxidation is saved, the processing cost of micro-arc oxidation is reduced, the preparation process is simple, and the preparation method is environment-friendly and pollution-free.
In order to more clearly show the technical scheme and the technical effects provided by the present invention, the method for micro-arc oxidation of magnesium alloy surface with low energy consumption provided by the embodiment of the present invention is described in detail with specific embodiments below.
Example 1
As shown in FIG. 1, a low-energy consumption micro-arc oxidation method for a magnesium alloy surface comprises the following steps:
step A, cutting AZ91 magnesium alloy into magnesium alloy workpieces with the length multiplied by the width multiplied by the thickness multiplied by 30mm multiplied by 5 mm; and drilling a hole in the magnesium alloy workpiece, wherein the size of the hole is matched with that of the suspended magnesium wire. And (2) sequentially grinding the surface of the magnesium alloy workpiece from coarse to fine by using sand paper of 400#, 600#, 800#, 1000#, 1200# and 1500#, then polishing, ultrasonically cleaning in acetone, and blow-drying to obtain the pretreated magnesium alloy workpiece.
Step B, taking a clean beaker, and adding NaOH and Na2SiO3、Na2B4O7Adding NaF and additive into a beaker, uniformly mixing, adding deionized water, and uniformly stirring to ensure that the concentration of NaOH in the mixed solution is 30-50 g/L, Na2SiO3The concentration of (A) is 20 g/L-40 g/L, Na2B4O7The concentration of (A) is 20 g/L-25 g/L, NaFThe concentration of the mixed solution is 0.1 g/L-1 g/L, then ammonia water or acetic acid is used as a pH regulator, the pH value of the mixed solution is adjusted to 12-14, the temperature is 23-35 ℃, and the mixed solution is uniformly stirred, so that the low-energy-consumption micro-arc oxidation electrolyte is obtained.
Step C, pouring the low-energy-consumption micro-arc oxidation electrolyte into an electrolytic cell, and stirring at room temperature for 20-30 min; mounting the magnesium alloy workpiece on a micro-arc oxidation electrolysis device by using a magnesium wire, placing the magnesium alloy workpiece in the low-energy-consumption micro-arc oxidation electrolyte for micro-arc oxidation treatment, wherein a power supply adopts a unipolar or bipolar pulse power supply, a constant current mode is selected, and the constant current density is 1.0A/dm2The duty ratio is 40%, the frequency is 500Hz, and the micro-arc oxidation treatment time is 8min, then the magnesium alloy workpiece after micro-arc oxidation treatment is taken out of the low-energy micro-arc oxidation electrolyte and is washed clean by deionized water, so that a uniform white micro-arc oxidation ceramic layer shown in figure 2 is prepared on the surface of the AZ91 magnesium alloy workpiece.
Specifically, the following tests are performed in the implementation process of the low-energy-consumption micro-arc oxidation method for the surface of the magnesium alloy provided in embodiment 1 of the present invention:
(1) in the micro-arc oxidation process of embodiment 1 of the present invention, the voltage status during the entire micro-arc oxidation process is recorded, thereby obtaining the voltage-time curve diagram as shown in fig. 3. As can be seen from fig. 3: the working voltage of the whole process of micro-arc oxidation in the embodiment 1 of the invention is below 120V. Compared with the conventional micro-arc oxidation technology of a silicate system, the voltage of the working area of the micro-arc oxidation in the embodiment 1 of the invention is reduced by 3-6 times, and the power consumption is reduced by 300-600%.
(2) The micro-arc oxidized ceramic layer produced on the surface of the AZ91 magnesium alloy in embodiment 1 of the present invention was observed with a scanning electron microscope, so that a surface topography photograph as shown in fig. 4 was obtained. As can be seen from fig. 4: the characteristic of a typical micro-arc oxidation porous layer is found on the surface of the micro-arc oxidation ceramic layer, and the appearance of a typical micro-arc oxidation crater is presented.
(3) The micro-arc oxidized ceramic layer produced on the surface of the AZ91 magnesium alloy in embodiment 1 of the present invention was observed with a scanning electron microscope, so that a cross-sectional morphology photograph as shown in fig. 5 was obtained. As can be seen from fig. 5: the micro-arc oxidation ceramic layer has a compact section and good combination with the substrate, and the thickness can reach 15.9 mu m.
(4) The micro-arc oxidized ceramic layer produced on the surface of the AZ91 magnesium alloy in embodiment 1 of the present invention was detected by an X-ray diffractometer, so that an XRD diffraction pattern as shown in fig. 6 can be obtained. As can be seen from fig. 6: the main phases of the micro-arc oxidation ceramic layer are MgO and MgSiO3·H2O、B2Mg、B2SiO5And (4) phases.
(5) The micro-arc oxidation ceramic layer prepared on the surface of the AZ91 magnesium alloy in the embodiment 1 of the invention is detected by adopting a Vickers hardness tester, the load of the Vickers hardness tester is 10N, the load retention time is 10s, and the hardness of the micro-arc oxidation ceramic layer is 304 HV/10.
(6) The micro-arc oxidation ceramic layer prepared on the surface of the AZ91 magnesium alloy in the invention 1 was detected by using an electrochemical workstation, so that the electrochemical polarization curve chart shown in FIG. 7 can be obtained. As can be seen from fig. 7: the corrosion current density of the micro-arc oxidation ceramic layer is 1.034 multiplied by 10 of that of the magnesium alloy substrate-6mA/cm2Reduced to 4.885 × 10-7mA/cm2The reduction is about 52.8%.
In conclusion, the embodiment of the invention can reduce the micro-arc oxidation working voltage from more than 300V to less than 180V under the same current density, so that the prepared micro-arc oxidation ceramic layer has excellent performance, the surface performance of the magnesium alloy is improved, the energy consumption of micro-arc oxidation is saved, the processing cost of micro-arc oxidation is reduced, the preparation process is simple, and the preparation method is environment-friendly and pollution-free.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The low-energy-consumption micro-arc oxidation method for the surface of the magnesium alloy is characterized by comprising the following steps of:
step 1, adding NaOH and Na2SiO3、Na2B4O7Mixing NaF, additive and deionized water to make the concentration of NaOH in the mixed solution be 30-50 g/L, Na2SiO3The concentration of (A) is 20 g/L-40 g/L, Na2B4O7The concentration of the mixed solution is 20 g/L-25 g/L, NaF and the concentration of the mixed solution is 0.1 g/L-1 g/L, and then the pH value of the mixed solution is adjusted to 12-14, so that the low-energy-consumption micro-arc oxidation electrolyte is obtained;
wherein the additive is Na2WO4At least one of sodium citrate and sodium tartrate;
and 2, placing the magnesium alloy workpiece in the low-energy-consumption micro-arc oxidation electrolyte for micro-arc oxidation treatment, wherein the working voltage in the whole process of micro-arc oxidation does not exceed 180V, so that a micro-arc oxidation ceramic layer is prepared on the surface of the magnesium alloy workpiece.
2. The magnesium alloy surface low-energy-consumption micro-arc oxidation method as claimed in claim 1, wherein the processing parameters of the micro-arc oxidation treatment comprise: the power supply adopts a constant current mode, and the constant current density is 0.5A/dm2～3.0A/dm2The duty ratio is 30-50%, the frequency is 500-1000 Hz, and the micro-arc oxidation treatment time is 3-20 min.
3. The magnesium alloy surface low-energy-consumption micro-arc oxidation method as claimed in claim 1 or 2, wherein the magnesium alloy workpiece is firstly ground, polished, cleaned and dried, and then is placed in the low-energy-consumption micro-arc oxidation electrolyte for micro-arc oxidation treatment.
4. The magnesium alloy surface low-energy-consumption micro-arc oxidation method as claimed in claim 1 or 2, wherein the thickness of the micro-arc oxidation ceramic layer is 15-35 μm.
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| CN113564662A (en) * | 2021-08-17 | 2021-10-29 | 北京石油化工学院 | Preparation method of magnesium alloy self-supporting micro-arc oxidation film layer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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