CN111945148A - Method for improving wear-resisting and corrosion-resisting properties of magnesium alloy - Google Patents
Method for improving wear-resisting and corrosion-resisting properties of magnesium alloy Download PDFInfo
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- CN111945148A CN111945148A CN202010628135.8A CN202010628135A CN111945148A CN 111945148 A CN111945148 A CN 111945148A CN 202010628135 A CN202010628135 A CN 202010628135A CN 111945148 A CN111945148 A CN 111945148A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
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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
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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
- C25D11/30—Anodisation of magnesium or alloys based thereon
Abstract
A method for improving the wear resistance and corrosion resistance of magnesium alloy belongs to the field of laser processing and manufacturing. The cladding coating material comprises the following components: 10.00 to 14.00 wt% of Si, 0.50 to 1.60 wt% of Cu, 0.40 to 1.00 wt% of Mg, 0.20 to 0.60 wt% of Ti, 0.20 to 1.10 wt% of Zr, 5.00 to 15.00 wt% of TiN, and the balance of Al. The laser power P is 1.0-4.0 KW, the diameter d of a circular light spot is 0.5-3.0 mm, the laser scanning speed V is 5-40 m/min, the lap joint rate is 40-50%, the defocusing amount is + 2-8 mm, the powder feeding rate is 30-90 g/min, the protective gas is argon, and the flow is 15-30L/min. After laser cladding, performing micro-arc oxidation treatment by using silicate electrolyte, wherein the electrical parameter voltage of a micro-arc oxidation power supply is 200-500V, the pulse frequency is 400-800 Hz, the duty ratio is 10-20%, and the current density is 10-20A/dm2The micro-arc oxidation time is 20-30 min, and the method can be obviously usedThe surface hardness, wear resistance and corrosion resistance of the magnesium alloy are improved.
Description
Technical Field
The invention relates to a method for improving wear-resisting and corrosion-resisting properties of magnesium alloy, which comprises the steps of cladding an aluminum-based wear-resisting and corrosion-resisting material on the surface of the magnesium alloy by laser, and then further improving the wear-resisting and corrosion-resisting properties by adopting micro-arc oxidation.
Background
The magnesium alloy is one of the most important metal structure materials for realizing light weight in industrial production in the 21 st century, has the advantages of small specific gravity, high strength, good shock absorption, excellent damping property and electromagnetic shielding property, good electric and heat conducting properties, easiness in recovery and the like, and is widely applied to the fields of automobiles, biomedical treatment, aerospace and the like. However, compared with other light metals, the magnesium alloy has poorer hardness, wear resistance and corrosion resistance, which seriously restricts the practical production and use of magnesium alloy engineering materials, and the modification treatment of the surface of the magnesium alloy to improve the hardness, wear resistance and corrosion resistance is particularly urgent.
The laser cladding technology can prepare the function strengthening coating on the metal surface with poor material performance at high efficiency, and change the corrosion resistance and wear resistance of the original metal surface. With the increase of the laser scanning speed, the microstructure crystal grains are finer, the heat affected zone is smaller, and the corrosion resistance is improved more obviously. The micro-arc oxidation technology is a surface modification technology which takes metal as an anode and generates micro-arc or spark in metal micropores of the anode, and after the aluminum-based wear-resistant and corrosion-resistant material is laser-clad on the surface of the magnesium alloy, the wear resistance and the corrosion resistance can be further improved by adopting micro-arc oxidation.
Disclosure of Invention
The invention relates to a material for improving the wear-resistant and corrosion-resistant performance of magnesium alloy and a composite treatment method.
A material for improving the wear-resistant and corrosion-resistant performance of magnesium alloy and a composite processing method thereof are characterized in that an aluminum-based wear-resistant and corrosion-resistant material is laser-clad on the surface of the magnesium alloy, and the material comprises the following components: 10.00 to 14.00 wt% of Si, 0.50 to 1.60 wt% of Cu, 0.40 to 1.00 wt% of Mg, 0.20 to 0.60 wt% of Ti, 0.20 to 1.10 wt% of Zr, 5.00 to 15.00 wt% of TiN, and the balance of Al.
Selecting the alloy powder of the strengthening layer according to the mass percentage, wherein the diameter of the alloy powder is about 70-150 micrometers, uniformly mixing the multi-element alloy powder in a ball mill, and placing the alloy powder in a vacuum drying oven for later use.
Selecting a magnesium alloy plate, polishing the magnesium alloy plate by using sand paper to remove an oxide film and burrs on the surface of the magnesium alloy plate, cleaning the magnesium alloy plate by using an acetone solution to remove impurities such as surface oil stains which are unfavorable for high-speed laser cladding, and then carrying out sand blasting treatment. The laser cladding process parameters are as follows: the laser power P is 1.0-4.0 KW, the diameter d of a circular light spot is 0.5-3.0 mm, the laser scanning speed V is 5-40 m/min, the lap joint rate is 40-50%, the defocusing amount is + 2-8 mm, the powder feeding rate is 30-90 g/min, the protective gas is argon, and the flow is 15-30L/min.
After laser cladding, carrying out micro-arc oxidation treatment by using silicate electrolyte to further improve the wear-resistant and corrosion-resistant properties, wherein the electrolyte comprises the following components: sodium silicate: 4-10 g/L, sodium hydroxide: 2-6 g/L, sodium chloride: 4-8 g/L of boric acid and 2-6 g/L of boric acid, and the components are mixed, dissolved by deionized water and stirred to prepare the electrolyte. The micro-arc oxidation power supply has the electrical parameter voltage of 200-500V, the pulse frequency of 400-800 Hz, the duty ratio of 10-20 percent and the current density of 10-20A/dm2And the micro-arc oxidation time is 20-30 min.
The coating prepared by compounding laser cladding and micro-arc oxidation has higher hardness, wear resistance and corrosion resistance
Drawings
FIG. 1 is a microstructure of a laser-clad aluminum-based coating
FIG. 2 is SEM appearance of laser cladding aluminum-based coating
FIG. 3 is a laser cladding aluminum-based coating TiN representation
FIG. 4 is an XRD pattern of laser cladding aluminum-based coating
FIG. 5 is a graph of hardness profile perpendicular to the coating direction
FIG. 6 is a polarization curve of electrochemical corrosion of a coating
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings, which are provided to aid understanding of the present invention and are not intended to limit the present invention.
Example one
(1) The components of the aluminum-based wear-resistant and corrosion-resistant material laser-clad on the surface of the magnesium alloy are as follows: 10.00 wt% of Si, 0.50 wt% of Cu, 0.40 wt% of Mg, 0.20 wt% of Ti, 0.20 wt% of Zr, 5.00 wt% of TiN, Al: 83.7 wt%. Selecting the alloy powder of the strengthening layer according to the mass percentage, wherein the diameter of the alloy powder is about 70-150 micrometers, uniformly mixing the multi-element alloy powder in a ball mill, and placing the alloy powder in a vacuum drying oven for later use.
(2) Selecting an AZ91D magnesium alloy plate, polishing the surface of the magnesium alloy plate by using sand paper to remove an oxide film and burrs on the surface of the magnesium alloy plate, cleaning the magnesium alloy plate by using an acetone solution to remove impurities such as surface oil stains which are unfavorable for high-speed laser cladding, and then carrying out sand blasting treatment. The laser cladding technological parameters of the coating are as follows: the laser power P is 1.0KW, the diameter d of the circular light spot is 0.5mm, the laser scanning speed V is 5m/min, the overlapping rate is 40%, the defocusing amount is +2mm, the powder feeding speed is 30g/min, the protective gas is argon, and the flow is 15L/min.
(3) After laser cladding, carrying out micro-arc oxidation treatment by using silicate electrolyte to further improve the wear-resistant and corrosion-resistant properties, mixing 4g/L sodium silicate, 2g/L sodium hydroxide, 4g/L sodium chloride and 2g/L boric acid, dissolving by using deionized water and stirring. The micro-arc oxidation power supply has the electrical parameter voltage of 200V, the pulse frequency of 400Hz, the duty ratio of 10 percent and the current density of 10A/dm2The micro-arc oxidation time is 20 min.
The coatings obtained in the examples were subjected to the following performance tests.
1. Microhardness test
The coatings cross-sections were tested for multi-point hardness perpendicular to the coating using a wilson VH1102 microhardness tester.
2. Test of Corrosion resistance
The corrosion resistance of the coating is tested by adopting a Shanghai Chenghua CHI660E electrochemical workstation and selecting 3.5 percent NaCl solution as a corrosive liquid.
Example two
(1) The same parts of the first embodiment are not described again, but the difference lies in the composition ratio of the aluminum-based wear-resistant corrosion-resistant material: 12.00 wt% of Si, 1.10 wt% of Cu, 0.70 wt% of Mg, 0.40 wt% of Ti, 0.60 wt% of Zr, 10.00 wt% of TiN, and 75.2 wt% of Al.
(2) The laser cladding technological parameters of the coating are as follows: the laser power P is 2.0KW, the diameter d of the circular light spot is 1.5mm, the laser scanning speed V is 20m/min, the overlapping rate is 45%, the defocusing amount is +5mm, the powder feeding speed is 60g/min, the protective gas is argon, and the flow is 20L/min.
(3) After laser cladding, carrying out micro-arc oxidation treatment by using silicate electrolyte to further improve the wear-resistant and corrosion-resistant properties, mixing 7g/L sodium silicate, 4g/L sodium hydroxide, 6g/L sodium chloride and 4g/L boric acid, dissolving by using deionized water and stirring. The micro-arc oxidation power supply has the electrical parameter voltage of 350V, the pulse frequency of 600Hz, the duty ratio of 15 percent and the current density of 15A/dm2The micro-arc oxidation time is 25 min.
EXAMPLE III
(1) The same parts of the first embodiment are not described again, but the difference lies in the composition ratio of the aluminum-based wear-resistant corrosion-resistant material: 14.00 wt% of Si, 1.60 wt% of Cu, 1.00 wt% of Mg, 0.60 wt% of Ti, 1.10 wt% of Zr, 15.00 wt% of TiN, and 66.7 wt% of Al.
(2) The laser cladding technological parameters of the coating are as follows: the laser power P is 4.0KW, the diameter d of the circular light spot is 3.0mm, the laser scanning speed V is 40m/min, the overlapping rate is 50%, the defocusing amount is +8mm, the powder feeding speed is 90g/min, the protective gas is argon, and the flow is 30L/min.
(3) After laser cladding, carrying out micro-arc oxidation treatment by using silicate electrolyte to further improve the wear-resistant and corrosion-resistant properties, mixing 10g/L sodium silicate, 6g/L sodium hydroxide, 8g/L sodium chloride and 6g/L boric acid, dissolving by using deionized water and stirring. The micro-arc oxidation power supply has the electrical parameter voltage of 500V, the pulse frequency of 800Hz, the duty ratio of 20 percent and the current density of 20A/dm2The micro-arc oxidation time is 30 min.
Claims (1)
1. The method for improving the wear resistance and corrosion resistance of the magnesium alloy is characterized in that the cladding coating material comprises the following components: 10.00 to 14.00 wt% of Si, 0.50 to 1.60 wt% of Cu, 0.40 to 1.00 wt% of Mg, 0.20 to 0.60 wt% of Ti, 0.20 to 1.10 wt% of Zr, 5.00 to 15.00 wt% of TiN, and the balance of Al;
the method comprises the following steps:
(1) selecting a magnesium alloy plate, polishing the magnesium alloy plate by using sand paper to remove an oxide film and burrs on the surface of the magnesium alloy plate, cleaning the magnesium alloy plate by using an acetone solution, and then performing sand blasting treatment;
(2) the laser cladding process parameters are as follows: the laser power P is 1.0-4.0 KW, the diameter d of a circular light spot is 0.5-3.0 mm, the laser scanning speed V is 5-40 m/min, the lap joint rate is 40-50%, the defocusing amount is + 2-8 mm, the powder feeding rate is 30-90 g/min, the protective gas is argon, and the flow rate is 15-30L/min;
(3) after laser cladding, carrying out micro-arc oxidation treatment on the coating by adopting silicate electrolyte, wherein the electrolyte is sodium silicate with the following concentration: 4-10 g/L, sodium hydroxide: 2-6 g/L, sodium chloride: 4-8 g/L of components of boric acid and 2-6 g/L of boric acid are used as solutes, and a solvent is deionized water; the micro-arc oxidation power supply has the electrical parameter voltage of 200-500V, the pulse frequency of 400-800 Hz, the duty ratio of 10-20 percent and the current density of 10-20A/dm2And the micro-arc oxidation time is 20-30 min.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113373492A (en) * | 2021-04-30 | 2021-09-10 | 上海交通大学 | Magnesium alloy ultrahigh frequency micro-arc oxidation treatment method |
| CN111945148B (en) * | 2020-07-02 | 2021-11-12 | 北京工业大学 | Method for improving wear-resisting and corrosion-resisting properties of magnesium alloy |
| WO2022178939A1 (en) * | 2021-02-23 | 2022-09-01 | 山东省科学院新材料研究所 | Laser-cladding powder for improving properties of aluminum-magnesium heterogeneous metal rivet joint |
| CN115572972A (en) * | 2022-10-25 | 2023-01-06 | 重庆理工大学 | Preparation method of high-hardness high-wear-resistance magnesium rare earth alloy coating on surface of magnesium-lithium alloy |
| CN115572972B (en) * | 2022-10-25 | 2024-05-17 | 重庆理工大学 | Preparation method of high-hardness high-wear-resistance magnesium rare earth alloy coating on magnesium-lithium alloy surface |
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| CN111945148B (en) * | 2020-07-02 | 2021-11-12 | 北京工业大学 | Method for improving wear-resisting and corrosion-resisting properties of magnesium alloy |
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