CN114836710A - Method for preparing anticorrosive coating on surface of magnesium alloy - Google Patents
Method for preparing anticorrosive coating on surface of magnesium alloy Download PDFInfo
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- CN114836710A CN114836710A CN202210558276.6A CN202210558276A CN114836710A CN 114836710 A CN114836710 A CN 114836710A CN 202210558276 A CN202210558276 A CN 202210558276A CN 114836710 A CN114836710 A CN 114836710A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 68
- 238000000576 coating method Methods 0.000 title claims abstract description 57
- 239000011248 coating agent Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000005260 corrosion Methods 0.000 claims abstract description 15
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 14
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 13
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 13
- 230000007797 corrosion Effects 0.000 claims abstract description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 22
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 20
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 18
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 12
- 239000001095 magnesium carbonate Substances 0.000 claims description 12
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 10
- 244000137852 Petrea volubilis Species 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 229910018137 Al-Zn Inorganic materials 0.000 claims description 4
- 229910018573 Al—Zn Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 11
- 239000000126 substance Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000009827 uniform distribution Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 24
- 238000010438 heat treatment Methods 0.000 description 22
- 239000008367 deionised water Substances 0.000 description 8
- 229910021641 deionized water Inorganic materials 0.000 description 8
- 235000019441 ethanol Nutrition 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 5
- 230000010287 polarization Effects 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Images
Classifications
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
Abstract
The invention provides a method for preparing an anticorrosive coating on the surface of a magnesium alloy, and relates to the technical field of surface coating preparation. The invention provides a method for preparing an anticorrosive coating on the surface of a magnesium alloy, which comprises the following steps: and immersing the magnesium alloy in water, introducing carbon dioxide gas, and carrying out hydrothermal reaction to obtain the anticorrosive coating on the surface of the magnesium alloy. The invention does not need fussy operation, has low manufacturing cost, does not generate substances which are easy to pollute the environment in the preparation process, and has better compactness of the prepared coating, uniform distribution, ideal corrosion resistance effect and stable performance. Different from the traditional complex process for preparing the anticorrosive coating, the preparation method disclosed by the invention is simple in preparation process, low in cost, high in efficiency and environment-friendly.
Description
Technical Field
The invention relates to the technical field of surface coating preparation, in particular to a method for preparing an anticorrosive coating on the surface of a magnesium alloy.
Background
The magnesium and the magnesium alloy have the advantages of high strength, low density, good damping performance, good electromagnetic shielding performance and the like, and are widely applied to the fields of automobiles, aerospace, transportation, 3C products, medical biomaterials and the like. In an air environment, magnesium and its alloys tend to form an oxide film on their surfaces, which is mainly composed of magnesium oxide and magnesium hydroxide, which are generally not dense, porous, and have poor corrosion resistance, especially in a humid environment. Therefore, the applicability of magnesium alloys is severely limited.
Disclosure of Invention
The invention aims to provide a method for preparing an anticorrosive coating on the surface of a magnesium alloy. And the preparation method is simple and easy to operate, the preparation cost is low, and substances polluting the environment can not be generated in the preparation process.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for preparing an anticorrosive coating on the surface of a magnesium alloy, which comprises the following steps:
and immersing the magnesium alloy in water, introducing carbon dioxide gas, and carrying out hydrothermal reaction to obtain the anticorrosive coating on the surface of the magnesium alloy.
Preferably, the magnesium alloy is a Mg-Al-Zn alloy.
Preferably, the magnesium alloy further comprises a pretreatment prior to immersion; the pretreatment comprises sand paper grinding and ultrasonic cleaning which are sequentially carried out.
Preferably, the ultrasonic cleaning comprises cleaning mixed liquor ultrasonic cleaning and water ultrasonic cleaning which are sequentially carried out; the cleaning mixed liquid is a mixed liquid of absolute ethyl alcohol and acetone.
Preferably, the flow rate of the introduced carbon dioxide gas is 0.2-0.3 MPa/s.
Preferably, the introduction amount of the carbon dioxide gas is based on the condition that the system reaches 1-4 MPa.
Preferably, the temperature of the hydrothermal reaction is 130-180 ℃; the heat preservation time is 4-12 h.
Preferably, the temperature rising rate from room temperature to the temperature of the hydrothermal reaction is 2.5-5 ℃/min.
Preferably, after the hydrothermal reaction, drying the obtained magnesium alloy to obtain the anticorrosive coating.
Preferably, the anti-corrosion coating is a magnesium carbonate coating; the thickness of the anticorrosive coating is 35-255 mu m.
The invention provides a method for preparing an anticorrosive coating on the surface of a magnesium alloy, which does not need complicated operation, has low manufacturing cost, does not generate substances which are easy to pollute the environment in the preparation process, and has the advantages of good compactness, uniform distribution, ideal corrosion resistance effect and stable performance of the prepared coating. Different from the traditional complex process for preparing the anticorrosive coating, the preparation method disclosed by the invention is simple in preparation process, low in cost, high in efficiency and environment-friendly.
Drawings
FIG. 1 is an SEM image of a magnesium alloy with a corrosion-resistant coating on the surface prepared in example 1 of the present invention;
FIG. 2 is an EDS diagram of an anticorrosion coating prepared in example 1 of the invention;
FIG. 3 is a comparison of the thickness of the corrosion protective coatings prepared in examples 1-3;
FIG. 4 is an XRD pattern of the corrosion protection coating prepared in example 1;
FIG. 5 is a comparison of polarization curves of AZ91D magnesium alloy and magnesium alloys with anticorrosive coatings on the surfaces prepared in examples 1-2.
Detailed Description
The invention provides a method for preparing an anticorrosive coating on the surface of a magnesium alloy, which comprises the following steps:
and immersing the magnesium alloy in water, introducing carbon dioxide gas, and carrying out hydrothermal reaction to obtain the anticorrosive coating on the surface of the magnesium alloy.
In the present invention, the magnesium alloy is preferably a Mg-Al-Zn-based alloy, and more preferably an AZ91D magnesium alloy. In the present invention, the magnesium alloy preferably further comprises a pretreatment before immersion; the pretreatment preferably comprises sanding and ultrasonic cleaning in sequence. In the invention, the magnesium alloy is preferably ground by 400-mesh, 800-mesh, 1000-mesh and 2000-mesh sand papers in sequence. The method can remove the oxide film on the surface of the magnesium alloy by adopting sand paper for polishing. In the invention, the ultrasonic cleaning preferably comprises cleaning mixed liquid ultrasonic cleaning and water ultrasonic cleaning which are sequentially carried out; the cleaning mixed liquid is preferably a mixed liquid of absolute ethyl alcohol and acetone; the volume ratio of the absolute ethyl alcohol to the acetone in the cleaning mixed solution is preferably 1: 1. In the present invention, the water is preferably deionized water.
In the present invention, the magnesium alloy immersed in water preferably includes: and (3) placing the magnesium alloy into a reaction kettle, and adding water into the reaction kettle until the magnesium alloy is immersed in the water. In the present invention, the water is preferably deionized water. The invention immerses the magnesium alloy in water to ensure Mg and H 2 O、CO 2 The reaction between them proceeds sufficiently.
According to the invention, after the magnesium alloy is immersed in water, carbon dioxide gas is introduced. In the invention, the flow rate of the carbon dioxide gas is preferably 0.2-0.3 MPa/s. In the invention, the introduction amount of the carbon dioxide gas is based on the condition that the system reaches 1-4 MPa. In the present invention, the carbon dioxide gas is preferably high purity CO 2 A gas. In the invention, the carbon dioxide gas is preferably introduced into a reaction kettle containing the magnesium alloy at room temperature until the gas pressure in the reaction kettle is 4 MPa.
In the invention, the temperature of the hydrothermal reaction is preferably 130-180 ℃; the heat preservation time is preferably 4-12 h, and more preferably 8-10 h. In the invention, the heating rate from room temperature to the hydrothermal reaction temperature is preferably 2.5-5 ℃/min, and more preferably 2.5 ℃/min. In the hydrothermal reaction process, MgO and Mg (OH) on the surface of the magnesium alloy 2 With CO 2 The gas generates a series of chemical reactions to generate a magnesium carbonate coating to cover the surface of the magnesium alloy. The thickness of the anticorrosive coating is adjusted by controlling the heat preservation time.
In the present invention, after the hydrothermal reaction, the obtained magnesium alloy is preferably dried to obtain an anticorrosive coating. In the present invention, the drying is preferably air drying; the drying temperature is preferably 35-50 ℃.
In the invention, the anti-corrosion coating is a magnesium carbonate coating; the thickness of the anticorrosive coating is preferably 35-255 mu m, and more preferably 55-180 mu m.
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.
The chemical compositions of the AZ91D magnesium alloy used in the examples of the present invention are shown in table 1.
TABLE 1AZ91D magnesium alloy chemical composition, mass fraction
Example 1
(1) Using AZ91D magnesium alloy as a base material, cutting an AZ91D magnesium alloy cast sample into a cuboid with the size of 30mm multiplied by 1mm, polishing the cuboid by using sand paper, placing the cuboid in a mixed solution of ethanol and acetone (the volume ratio of the ethanol to the acetone is 1:1) for ultrasonic cleaning for 15min, then placing the cuboid in deionized water for ultrasonic cleaning for 10min, and cleaning the cuboid for later use;
(2) putting the sample treated in the step (1) into a reaction kettle of a high-temperature high-pressure corrosion instrument, and simultaneously adding deionized water into the kettle until the sample is immersed;
(3) high purity CO 2 Introducing gas into the reaction kettle at room temperature, wherein the introduced flow is 0.2MPa/s until the pressure of the gas displayed by an instrument display screen is 4 MPa;
(4) checking whether the air tightness of the reaction kettle is intact in the ventilation process, installing the reaction kettle according to the instrument standard after the air tightness is finished, then opening a switch, heating the reaction kettle, and carrying out heat treatment on the AZ91D magnesium alloy placed in a water bath, wherein the heat treatment process comprises the following steps: heating the water bath in a gradual heating mode at a heating speed of 2.5 ℃/min to 180 ℃ and keeping the temperature for 4 h;
(5) and after the heat treatment of the magnesium alloy substrate is finished, taking out the AZ91D magnesium alloy after the temperature of the reaction kettle is reduced to room temperature, and forming a compact magnesium carbonate coating on the surface to obtain the magnesium alloy with the anticorrosive coating on the surface. The thickness of the magnesium carbonate coating prepared by the embodiment is 35-55 μm.
Example 2
(1) Using AZ91D magnesium alloy as a base material, cutting a Mg-Al-Zn cast sample into a cuboid with the size of 30mm multiplied by 1mm in a linear manner, polishing the cuboid by using sand paper, placing the cuboid in a mixed solution of ethanol and acetone (the volume ratio of the ethanol to the acetone is 1:1) for ultrasonic cleaning for 15min, then placing the cuboid in deionized water for ultrasonic cleaning for 10min, and cleaning the cuboid for later use;
(2) putting the sample treated in the step (1) into a reaction kettle of a high-temperature high-pressure corrosion instrument, and simultaneously adding deionized water into the kettle until the sample is immersed;
(3) high purity CO 2 Introducing gas into the reaction kettle at room temperature, wherein the introduced flow is 0.2MPa/s until the pressure of the gas displayed by an instrument display screen is 4 MPa;
(4) checking whether the air tightness of the reaction kettle is intact in the ventilation process, installing the reaction kettle according to the instrument standard after the air tightness is finished, then opening a switch, heating the reaction kettle, and carrying out heat treatment on the AZ91D magnesium alloy placed in a water bath, wherein the heat treatment process comprises the following steps: heating the water bath in a gradual heating mode at a heating speed of 2.5 ℃/min to 180 ℃ and keeping the temperature for 8 hours;
(5) and after the magnesium alloy matrix is subjected to heat treatment, taking out the AZ91D magnesium alloy after the temperature of the reaction kettle is reduced to room temperature, and forming a compact magnesium carbonate coating on the surface to obtain the magnesium alloy with the anticorrosive coating on the surface. The thickness of the magnesium carbonate coating prepared by the embodiment is 85-110 μm.
Example 3
(1) Using AZ91D magnesium alloy as a base material, cutting an AZ91D magnesium alloy cast sample into a cuboid with the size of 30mm multiplied by 1mm, polishing the cuboid by using sand paper, placing the cuboid in a mixed solution of ethanol and acetone (the volume ratio of the ethanol to the acetone is 1:1) for ultrasonic cleaning for 15min, then placing the cuboid in deionized water for ultrasonic cleaning for 10min, and cleaning the cuboid for later use;
(2) putting the sample treated in the step (1) into a reaction kettle of a high-temperature high-pressure corrosion instrument, and simultaneously adding deionized water into the kettle until the sample is immersed;
(3) high purity CO 2 Introducing gas into the reaction kettle at room temperature, wherein the introduced flow is 0.2MPa/s until the pressure of the gas displayed by an instrument display screen is 4 MPa;
(4) checking whether the air tightness of the reaction kettle is intact in the ventilation process, installing the reaction kettle according to the instrument standard after the air tightness is finished, then opening a switch, heating the reaction kettle, and carrying out heat treatment on the AZ91D magnesium alloy placed in a water bath, wherein the heat treatment process comprises the following steps: heating the water bath in a gradual heating mode at a heating speed of 2.5 ℃/min to 180 ℃ and keeping the temperature for 12 h;
(5) and after the heat treatment of the magnesium alloy substrate is finished, taking out the AZ91D magnesium alloy after the temperature of the reaction kettle is reduced to room temperature, and forming a compact magnesium carbonate coating on the surface to obtain the magnesium alloy with the anticorrosive coating on the surface. The thickness of the magnesium carbonate coating prepared by the embodiment is 180-255 mu m.
Fig. 1 is an SEM image of a magnesium alloy having an anticorrosive coating on the surface thereof prepared in example 1 of the present invention. As can be seen from FIG. 1, a dense film layer is formed on the surface of the magnesium alloy substrate.
FIG. 2 is an EDS picture of an anticorrosion coating prepared in example 1 of the invention. As can be seen in FIG. 2, the atomic ratio of Mg to O is approximately 1:3, and is expected to coincide.
FIG. 3 is a thickness comparison graph of anticorrosive coatings prepared in examples 1 to 3, wherein (a) of FIG. 3 is example 1, (b) of FIG. 3 is example 2, and (c) of FIG. 3 is example 3. As can be seen from fig. 3, the thickness of the anticorrosive coating gradually increases as the holding time is prolonged.
Fig. 4 is an XRD pattern of the corrosion protection coating prepared in example 1. As can be seen from fig. 4, the anticorrosive coating generated on the surface of the magnesium alloy is a magnesium carbonate coating.
FIG. 5 is a comparison of polarization curves of AZ91D magnesium alloy and magnesium alloys with anticorrosive coatings on the surfaces prepared in examples 1-2. The electrolyte for testing the polarization curve is a NaCl solution with the mass fraction of 3.5%, and the test conditions are as follows: under the condition of room temperature, carrying out potential polarization measurement at a scanning rate of 0.166mV/s under-300- +600mV and open circuit potential; platinum sheet (25 mm. times.25 mm. times.0.2 mm) as a counter electrode, AgCl as a reference electrode, and an exposed area of 1cm 2 The disk-shaped AZ91D sample was used as a working electrode.
As can be seen from fig. 5, the corrosion current density of the magnesium carbonate coating prepared in example 2 is reduced by 3 orders of magnitude compared with that of the blank magnesium alloy, indicating that the coating prepared in this example has good corrosion resistance.
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 (10)
1. A method for preparing an anticorrosive coating on the surface of a magnesium alloy comprises the following steps:
and immersing the magnesium alloy in water, introducing carbon dioxide gas, and carrying out hydrothermal reaction to obtain the anticorrosive coating on the surface of the magnesium alloy.
2. The method according to claim 1, wherein the magnesium alloy is a Mg-Al-Zn based alloy.
3. The method of claim 1, wherein the magnesium alloy further comprises a pretreatment prior to immersion; the pretreatment comprises sand paper grinding and ultrasonic cleaning which are sequentially carried out.
4. The method according to claim 3, wherein the ultrasonic cleaning comprises cleaning mixed liquid ultrasonic cleaning and water ultrasonic cleaning which are performed in sequence; the cleaning mixed solution is a mixed solution of absolute ethyl alcohol and acetone.
5. The method according to claim 1, wherein the carbon dioxide gas is introduced at a flow rate of 0.2 to 0.3 MPa/s.
6. The method according to claim 1 or 5, wherein the carbon dioxide gas is introduced in an amount such that the system pressure is 1 to 4 MPa.
7. The method according to claim 1, wherein the temperature of the hydrothermal reaction is 130-180 ℃; the heat preservation time is 4-12 h.
8. The method according to claim 7, wherein the rate of temperature increase from room temperature to the temperature of the hydrothermal reaction is 2.5 to 5 ℃/min.
9. The method according to claim 1, wherein after the hydrothermal reaction, the obtained magnesium alloy is dried to obtain the anticorrosive coating.
10. The method of claim 1, wherein the corrosion protection coating is a magnesium carbonate coating; the thickness of the anticorrosive coating is 35-255 mu m.
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| CN117070944A (en) * | 2023-08-25 | 2023-11-17 | 中国矿业大学 | Mineralization repair method for magnesium alloy oxide film defect |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117070944A (en) * | 2023-08-25 | 2023-11-17 | 中国矿业大学 | Mineralization repair method for magnesium alloy oxide film defect |
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