CN113802166A - Micro-arc oxidation treatment method of Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase - Google Patents
Micro-arc oxidation treatment method of Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase Download PDFInfo
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- CN113802166A CN113802166A CN202111148734.0A CN202111148734A CN113802166A CN 113802166 A CN113802166 A CN 113802166A CN 202111148734 A CN202111148734 A CN 202111148734A CN 113802166 A CN113802166 A CN 113802166A
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- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 title claims abstract description 91
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000001035 drying Methods 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000004140 cleaning Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 239000000243 solution Substances 0.000 claims description 17
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 11
- 239000004115 Sodium Silicate Substances 0.000 claims description 10
- 230000032683 aging Effects 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 10
- 239000011777 magnesium Substances 0.000 claims description 9
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 6
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 6
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 claims description 5
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000000280 densification Methods 0.000 claims description 5
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 239000006104 solid solution Substances 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000011775 sodium fluoride Substances 0.000 claims description 4
- 235000013024 sodium fluoride Nutrition 0.000 claims description 4
- 239000011698 potassium fluoride Substances 0.000 claims description 3
- 235000003270 potassium fluoride Nutrition 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000002360 preparation method Methods 0.000 abstract description 5
- 239000000919 ceramic Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- BDOYKFSQFYNPKF-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-(carboxymethyl)amino]acetic acid;sodium Chemical compound [Na].[Na].OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O BDOYKFSQFYNPKF-UHFFFAOYSA-N 0.000 abstract description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 8
- 239000008367 deionised water Substances 0.000 description 8
- 229910021641 deionized water Inorganic materials 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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 provides a micro-arc oxidation treatment method of Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase, which comprises the following steps: designing and treating the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase to obtain a sample to be oxidized; placing a sample to be oxidized in micro-arc oxidation pretreatment liquid for ultrasonic treatment; taking out and cleaning, and placing in a drying oven for drying to obtain a dried sample to be oxidized; and then put into an electrolytic bath containing micro-arc oxidation electrolytic water solution for micro-arc oxidation treatment; according to the invention, a micro-arc oxidation process is adopted, and a film-forming compacting agent and ethylene diamine tetraacetic acid disodium are added into a silicate system, so that a stable micro-arc oxidation film layer is formed on the surface of the Mg-Gd-Y-Zn-Zr magnesium alloy containing an LPSO phase; the invention realizes the preparation of the micro-arc oxidation ceramic film on the surface of the Mg-Gd-Y-Zn-Zr magnesium alloy containing the LPSO phase, and the method has short film forming time, simple working procedure and convenient operation.
Description
Technical Field
The invention belongs to the technical field of metal surface treatment, and particularly relates to a micro-arc oxidation treatment method of an LPSO phase-containing Mg-Gd-Y-Zn-Zr magnesium alloy.
Background
The magnesium alloy is used as the lightest metal structure material, has the characteristics of high specific strength and specific rigidity, good damping performance, good casting performance, excellent machinability, good shielding interference and the like, and has wide application prospect in the fields of automobiles, 3C, national defense and military industry, aerospace and the like. However, magnesium has the lowest standard electrode potential in metal structural materials, and an oxide film of the magnesium is loose and porous, so that an effective stable protective film cannot be formed, the corrosion problems such as galvanic corrosion, environmental corrosion and the like easily occur in most corrosive environments, the magnesium cannot be continuously used, and the wide application of the magnesium alloy is limited. Therefore, how to improve the corrosion resistance of the magnesium alloy has become a bottleneck problem which must be solved for the wide application of the magnesium alloy.
Micro-arc oxidation is used as a novel surface treatment means, valve metals such as aluminum, magnesium, titanium and the like and alloys thereof are placed in electrolyte, and a ceramic oxide film layer is generated in situ by generating spark discharge spots on the surface of a material under the action of thermochemistry, plasma chemistry and electrochemistry by an electrochemical method. The film obtained by the method has the characteristics of compact structure, high binding force, strong corrosion resistance, high hardness and the like. By the treatment method, the corrosion resistance of the magnesium alloy can be greatly improved.
The Mg-Gd-Y-Zn-Zr magnesium alloy has LPSO phase in the interior, so that the plasticity of the material can be improved, and the components and the structure of the Mg-Gd-Y-Zn-Zr magnesium alloy have larger difference with the common magnesium alloy, so that the formula and the process of micro-arc oxidation of the Mg-Gd-Y-Zn-Zr magnesium alloy containing the LPSO phase have certain difference.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a micro-arc oxidation treatment method of Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase.
In order to achieve the above purpose, the solution of the invention is as follows:
a micro-arc oxidation treatment method of Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase comprises the following steps:
(1) designing and processing the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase into a test piece with the length of 25mm, the width of 25mm and the height of 6mm to obtain a sample to be oxidized;
(2) placing a sample to be oxidized in micro-arc oxidation pretreatment liquid, wherein the temperature of the micro-arc oxidation pretreatment liquid is 30-45 ℃, and the time of ultrasonic treatment is 3-5 min;
(3) taking out the sample to be oxidized from the micro-arc oxidation pretreatment liquid in the step (2), placing the sample to be oxidized in deionized water for cleaning, and placing the sample to be oxidized in an oven for drying to obtain a dried sample to be oxidized;
(4) placing the dried sample to be oxidized into an electrolytic bath containing micro-arc oxidation electrolytic aqueous solution, taking the sample to be oxidized as an anode and stainless steel as a cathode, switching on a micro-arc oxidation power supply to perform micro-arc oxidation treatment to form a stable and compact magnesium alloy with a micro-arc oxidation film layer, then placing the magnesium alloy in deionized water to clean for 1-2min, taking out and drying.
Further, in the step (1), preparing the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase: producing an alloy cast rod by a semi-continuous casting mode, and then carrying out solid solution treatment and aging treatment; the diameter of the alloy cast rod is 300 +/-1 mm, the height of the crystallizer is 150 +/-1 mm, the casting speed is 45-55mm/min, and the secondary cooling water flow is 150 +/-1L/min; the temperature of the solution treatment is 505 +/-1 ℃, the time is 18 +/-0.1 h, and then air cooling is carried out; the temperature of the aging treatment is 200 +/-1 ℃, the time is 60 +/-0.1 h, and then the air cooling is carried out.
Further, in the step (1), the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase has 8.0 to 9.0 wt% of Gd, 2.5 to 3.0 wt% of Y, 1.5 to 2.5 wt% of Zn, 0.45 to 0.55 wt% of Zr, and the balance of Mg content and impurity content.
Further, in the step (2), the micro-arc oxidation pretreatment solution contains 3-6g/L of sodium hydroxide and 2-8g/L of sodium silicate solution.
Further, in the step (3), the cleaning time is 1-2 min; the drying temperature is 40-50 ℃, and the drying time is 5-10 min.
Further, in the step (4), the micro-arc oxidation electrolytic aqueous solution comprises 5-10g/L of sodium silicate, 4-8g/L of sodium hydroxide, 4-8g/L of film-forming densification agent and 2-4g/L of disodium ethylene diamine tetraacetate.
Further, the film-forming densification agent is selected from one or more of sodium fluoride and potassium fluoride.
Further, in the step (4), the micro-arc oxidation treatment time is 3-5min, and the average current is 4-8A/dm2The duty ratio is 10-20%, the frequency is 500-1000Hz, and the temperature in the electrolytic cell is 20-30 ℃. In addition, a refrigeration system is started to keep the temperature in the electrolytic bath at 20-30 ℃ during the micro-arc oxidation treatment, so that a compact and stable micro-arc oxide film layer is formed on the surface of the sample.
Further, in the step (4), the drying temperature is 40-50 ℃, and the drying time is 5-10 min.
Further, in the step (4), the thickness of the micro-arc oxide film is 10-15 μm.
Due to the adoption of the scheme, the invention has the beneficial effects that:
firstly, the invention adopts a micro-arc oxidation process, and adds a film-forming densification agent and ethylene diamine tetraacetic acid disodium in a silicate system to form a stable micro-arc oxidation film layer on the surface of the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase.
Secondly, the micro-arc oxidation pretreatment solution and the micro-arc oxidation electrolytic aqueous solution do not contain environmental protection limiting elements, and have simple components and low cost.
Thirdly, the invention can rapidly realize the rapid preparation of the micro-arc oxidation ceramic membrane on the surface of the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase, and the method has the advantages of short membrane forming time, simple working procedure and convenient operation.
Detailed Description
The invention provides a micro-arc oxidation treatment method of an LPSO phase-containing Mg-Gd-Y-Zn-Zr magnesium alloy.
The present invention will be further described with reference to the following examples.
The chemical reagents used in the embodiments of the present invention are all commercially available, homemade brands, and analytically pure grades.
Example 1:
the micro-arc oxidation treatment method of the Mg-Gd-Y-Zn-Zr magnesium alloy containing the LPSO phase comprises the following steps:
(1) and designing and processing the Mg-Gd-Y-Zn-Zr magnesium alloy containing the LPSO phase into a test piece with the length of 25mm, the width of 25mm and the height of 6mm to obtain a sample to be oxidized, wherein Gd in the Mg-Gd-Y-Zn-Zr magnesium alloy containing the LPSO phase is 8.0 wt%, Y is 2.5 wt%, Zn is 1.6 wt%, Zr is 0.45 wt%, and the balance is Mg content and impurity content.
(2) Placing a sample to be oxidized in micro-arc oxidation pretreatment liquid, wherein the temperature of the micro-arc oxidation pretreatment liquid is 30 ℃, and the ultrasonic treatment time is 3 min; wherein the micro-arc oxidation pretreatment solution contains 3g/L of sodium hydroxide and 2g/L of sodium silicate solution.
(3) Taking out the sample to be oxidized from the micro-arc oxidation pretreatment liquid in the step (2), placing the sample to be oxidized in deionized water for cleaning for 1min, and placing the sample to be oxidized in an oven for drying to obtain a dried sample to be oxidized; wherein the drying temperature is 40 ℃, and the drying time is 7 min.
(4) Placing the dried sample to be oxidized into an electrolytic bath containing a micro-arc oxidation electrolytic aqueous solution, connecting a micro-arc oxidation power supply to perform micro-arc oxidation treatment by taking the sample to be oxidized as an anode and stainless steel as a cathode, wherein the micro-arc oxidation treatment time is 5min, and the average current is 4A/dm2The duty ratio is 10%, the frequency is 1000Hz, the temperature of the electrolyte in the electrolytic bath is controlled to be 20 ℃ during the micro-arc oxidation treatment, a stable and compact micro-arc oxidation film layer with the thickness of 10 mu m is formed, then the micro-arc oxidation film layer is placed in deionized water to be cleaned for 1min, and the micro-arc oxidation film layer is taken out and dried for 5min at the temperature of 40 ℃. Wherein the micro-arc oxidation electrolytic aqueous solution comprises 5g/L of sodium silicate, 4g/L of sodium hydroxide, 4g/L of sodium fluoride and 2g/L of disodium ethylene diamine tetraacetate.
Wherein, in the step (1), the preparation of the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase: producing an alloy cast rod by a semi-continuous casting mode, and then carrying out solid solution treatment and aging treatment; the diameter of the alloy cast rod is 300mm, the height of the crystallizer is 150mm, the casting speed is 45mm/min, and the secondary cooling water flow is 150L/min; the temperature of the solution treatment is 505 ℃, the time is 18h, and then air cooling is carried out; the temperature of the aging treatment is 200 ℃, the time is 60 hours, and then the air cooling is carried out.
Example 2:
the micro-arc oxidation treatment method of the Mg-Gd-Y-Zn-Zr magnesium alloy containing the LPSO phase comprises the following steps:
(1) designing and processing the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase into a test piece with the length of 25mm, the width of 25mm and the height of 6mm to obtain a sample to be oxidized; wherein, the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase comprises 8.5 wt% of Gd, 2.7 wt% of Y, 1.9 wt% of Zn, 0.48 wt% of Zr, and the balance of Mg content and impurity content.
(2) Placing a sample to be oxidized in micro-arc oxidation pretreatment liquid, wherein the temperature of the micro-arc oxidation pretreatment liquid is 35 ℃, and the ultrasonic treatment time is 5 min; wherein the micro-arc oxidation pretreatment solution contains 5g/L of sodium hydroxide and 4g/L of sodium silicate solution.
(3) Taking out the sample to be oxidized from the micro-arc oxidation pretreatment liquid in the step (2), placing the sample to be oxidized in deionized water for cleaning for 2min, and placing the sample to be oxidized in an oven for drying to obtain a dried sample to be oxidized; wherein the drying temperature is 45 ℃ and the drying time is 5 min.
(4) Placing the dried sample to be oxidized into an electrolytic bath containing a micro-arc oxidation electrolytic aqueous solution, connecting a micro-arc oxidation power supply to perform micro-arc oxidation treatment by taking the sample to be oxidized as an anode and stainless steel as a cathode, wherein the micro-arc oxidation treatment time is 4min, and the average current is 6A/dm2The duty ratio is 15%, the frequency is 750Hz, the temperature of the electrolyte in the electrolytic bath is controlled to be 25 ℃ during the micro-arc oxidation treatment, a stable and compact micro-arc oxidation film layer with the thickness of 13 mu m is formed, then the micro-arc oxidation film layer is placed in deionized water to be cleaned for 1min, and the micro-arc oxidation film layer is taken out and dried for 10min at the temperature of 50 ℃. Wherein the micro-arc oxidation electrolytic aqueous solution comprises 7g/L sodium silicate, 5g/L sodium hydroxide, 6g/L potassium fluoride and 2.5g/L disodium ethylene diamine tetraacetate.
Wherein, in the step (1), the preparation of the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase: producing an alloy cast rod by a semi-continuous casting mode, and then carrying out solid solution treatment and aging treatment; the diameter of the alloy cast rod is 300mm, the height of the crystallizer is 150mm, the casting speed is 50mm/min, and the secondary cooling water flow is 150L/min; the temperature of the solution treatment is 505 ℃, the time is 18h, and then air cooling is carried out; the temperature of the aging treatment is 200 ℃, the time is 60 hours, and then the air cooling is carried out.
Example 3:
the micro-arc oxidation treatment method of the Mg-Gd-Y-Zn-Zr magnesium alloy containing the LPSO phase comprises the following steps:
(1) designing and processing the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase into a test piece with the length of 25mm, the width of 25mm and the height of 6mm to obtain a sample to be oxidized; wherein the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase contains 9.0 wt% of Gd, 3.0 wt% of Y, 2.5 wt% of Zn, 0.55 wt% of Zr, and the balance of Mg content and impurity content.
(2) Placing a sample to be oxidized in micro-arc oxidation pretreatment liquid, wherein the temperature of the pretreatment liquid is 45 ℃, and the ultrasonic treatment time is 5 min; wherein the micro-arc oxidation pretreatment solution contains 6g/L of sodium hydroxide and 8g/L of sodium silicate solution.
(3) Taking out the sample to be oxidized from the micro-arc oxidation pretreatment liquid in the step (2), placing the sample to be oxidized in deionized water for cleaning for 2min, and placing the sample to be oxidized in an oven for drying to obtain a dried sample to be oxidized; the drying temperature is 50 deg.C, and the drying time is 10 min.
(4) Placing the dried sample to be oxidized into an electrolytic bath containing a micro-arc oxidation electrolytic aqueous solution, connecting a micro-arc oxidation power supply to perform micro-arc oxidation treatment by taking the sample to be oxidized as an anode and stainless steel as a cathode, wherein the micro-arc oxidation treatment time is 5min, and the average current is 8A/dm2Duty ratio of 20% and frequency of 500 Hz; during micro-arc oxidation treatment, the temperature of electrolyte in the electrolytic bath is controlled to be 30 ℃, a stable and compact micro-arc oxidation film layer with the thickness of 15 mu m is formed, then the micro-arc oxidation film layer is placed in deionized water to be cleaned for 1min, and the micro-arc oxidation film layer is taken out and dried for 10min at the temperature of 50 ℃. The micro-arc oxidation electrolytic aqueous solution comprises 10g/L of sodium silicate, 8g/L of sodium hydroxide, 8g/L of sodium fluoride and 4g/L of disodium ethylene diamine tetraacetate.
Wherein, in the step (1), the preparation of the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase: producing an alloy cast rod by a semi-continuous casting mode, and then carrying out solid solution treatment and aging treatment; the diameter of the alloy cast rod is 300mm, the height of the crystallizer is 150mm, the casting speed is 55mm/min, and the secondary cooling water flow is 150L/min; the temperature of the solution treatment is 505 ℃, the time is 18h, and then air cooling is carried out; the temperature of the aging treatment is 200 ℃, the time is 60 hours, and then the air cooling is carried out.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments and the generic principles defined herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments. Those skilled in the art should appreciate that many modifications and variations are possible in light of the above teaching without departing from the scope of the invention.
Claims (10)
1. A micro-arc oxidation treatment method of Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase is characterized in that: which comprises the following steps:
(1) processing the Mg-Gd-Y-Zn-Zr magnesium alloy containing LPSO phase into a test piece with the length of 25mm, the width of 25mm and the height of 6mm to obtain a sample to be oxidized;
(2) placing the sample to be oxidized in a micro-arc oxidation pretreatment liquid, wherein the temperature of the micro-arc oxidation pretreatment liquid is 30-45 ℃, and the time of ultrasonic treatment is 3-5 min;
(3) taking the to-be-oxidized sample out of the micro-arc oxidation pretreatment liquid in the step (2), cleaning, and drying to obtain a dried to-be-oxidized sample;
(4) and placing the dried sample to be oxidized into an electrolytic bath containing micro-arc oxidation electrolytic aqueous solution, performing micro-arc oxidation treatment on the sample to be oxidized as an anode and stainless steel as a cathode to obtain the magnesium alloy with a compact micro-arc oxidation film layer, and then cleaning and drying the magnesium alloy.
2. The method for micro-arc oxidation treatment of Mg-Gd-Y-Zn-Zr magnesium alloy according to claim 1, wherein: in the step (1), preparing the Mg-Gd-Y-Zn-Zr magnesium alloy containing the LPSO phase: producing an alloy cast rod by a semi-continuous casting mode, and then carrying out solid solution treatment and aging treatment; the diameter of the alloy cast rod is 300 +/-1 mm, the height of the crystallizer is 150 +/-1 mm, the casting speed is 45-55mm/min, and the secondary cooling water flow is 150 +/-1L/min; the temperature of the solution treatment is 505 +/-1 ℃, and the time is 18 +/-0.1 h; the temperature of the aging treatment is 200 plus or minus 1 ℃, and the time is 60 plus or minus 0.1 h.
3. The method for micro-arc oxidation treatment of Mg-Gd-Y-Zn-Zr magnesium alloy according to claim 1, wherein: in the step (1), Gd in the Mg-Gd-Y-Zn-Zr magnesium alloy containing the LPSO phase accounts for 8.0 to 9.0wt percent, Y accounts for 2.5 to 3.0wt percent, Zn accounts for 1.5 to 2.5wt percent, Zr accounts for 0.45 to 0.55wt percent, and the balance is Mg content and impurity content.
4. The method for micro-arc oxidation treatment of Mg-Gd-Y-Zn-Zr magnesium alloy according to claim 1, wherein: in the step (2), the micro-arc oxidation pretreatment solution contains 3-6g/L of sodium hydroxide and 2-8g/L of sodium silicate solution.
5. The method for micro-arc oxidation treatment of Mg-Gd-Y-Zn-Zr magnesium alloy according to claim 1, wherein: in the step (3), the cleaning time is 1-2 min; the drying temperature is 40-50 ℃, and the drying time is 5-10 min.
6. The method for micro-arc oxidation treatment of Mg-Gd-Y-Zn-Zr magnesium alloy according to claim 1, wherein: in the step (4), the micro-arc oxidation electrolytic aqueous solution comprises 5-10g/L of sodium silicate, 4-8g/L of sodium hydroxide, 4-8g/L of film-forming densification agent and 2-4g/L of disodium ethylene diamine tetraacetate.
7. The method for micro-arc oxidation treatment of Mg-Gd-Y-Zn-Zr magnesium alloy according to claim 6, wherein: the film-forming densification agent is selected from more than one of sodium fluoride or potassium fluoride.
8. The method for micro-arc oxidation treatment of Mg-Gd-Y-Zn-Zr magnesium alloy according to claim 1, wherein: in the step (4), the micro-arc oxidation treatment time is 3-5min, and the average current is 4-8A/dm2The duty ratio is 10-20%, the frequency is 500-1000Hz, and the temperature in the electrolytic cell is 20-30 ℃.
9. The method for micro-arc oxidation treatment of Mg-Gd-Y-Zn-Zr magnesium alloy according to claim 1, wherein: in the step (4), the drying temperature is 40-50 ℃, and the drying time is 5-10 min.
10. The method for micro-arc oxidation treatment of Mg-Gd-Y-Zn-Zr magnesium alloy according to claim 1, wherein: in the step (4), the thickness of the micro-arc oxide film is 10-15 μm.
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| CN111020672A (en) * | 2019-11-30 | 2020-04-17 | 长沙新材料产业研究院有限公司 | Micro-arc oxidation process for Mg-Gd-Y magnesium alloy |
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