CN114657621A - Method for improving corrosion resistance of micro-arc porous magnesium oxide coating on surface of magnesium alloy - Google Patents

Method for improving corrosion resistance of micro-arc porous magnesium oxide coating on surface of magnesium alloy Download PDF

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CN114657621A
CN114657621A CN202011554110.4A CN202011554110A CN114657621A CN 114657621 A CN114657621 A CN 114657621A CN 202011554110 A CN202011554110 A CN 202011554110A CN 114657621 A CN114657621 A CN 114657621A
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magnesium oxide
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manganese
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CN114657621B (en
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刘宣勇
张冬冬
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Shanghai Institute of Ceramics of CAS
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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
    • 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
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • 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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Abstract

The invention relates to a method for improving the corrosion resistance of a micro-arc porous magnesium oxide coating on the surface of a magnesium alloy. The phase of the micro-arc porous magnesium oxide coating comprises magnesium oxide; the method comprises the following steps: soaking the magnesium alloy covered with the micro-arc porous magnesium oxide coating in a manganese ion solution to obtain a porous amorphous hydroxyl manganese oxide coating on the surface of the magnesium alloy; preferably, the manganese ion solution is a manganese nitrate and/or manganese chloride solution, and the solvent is water.

Description

Method for improving corrosion resistance of micro-arc porous magnesium oxide coating on surface of magnesium alloy
Technical Field
The invention relates to a method for improving corrosion resistance of a micro-arc porous magnesium oxide coating on a magnesium alloy surface, in particular to a surface modification mode for constructing an amorphous manganese oxyhydroxide (MnOOH) coating on the surface of the micro-arc porous magnesium oxide coating by using a soaking method, and belongs to the technical field of surface modification of metal materials.
Background
The magnesium and the alloy material thereof play an important role in the fields of aerospace industry, war industry, traffic, ship industry and the like due to higher specific strength. However, magnesium has a too low electrochemical potential and is highly susceptible to corrosion in humid air, aqueous solutions, especially solutions containing chloride ions. For industrial applications, too fast corrosion makes it prone to lose mechanical support properties, with a great safety risk.
Surface modification of magnesium and its alloys is a common method to improve its corrosion resistance. Nowadays, the exploration of micro-arc oxidation coating plays an important role in the field of magnesium and surface modification and corrosion prevention thereof, and attracts the attention of many researchers. The problems still present with the micro-arc magnesium oxide coating itself are as follows: (1) the surface of the micro-arc magnesium oxide coating is in a porous structure, so that a corrosion medium can contact the magnesium alloy substrate, and the corrosion protection performance of the magnesium alloy substrate is reduced; (2) the corrosion product of the micro-arc magnesium oxide coating is mainly magnesium hydroxide, and the solution of the magnesium hydroxide in a sodium chloride solution is easily converted into soluble magnesium chloride, so that the corrosion resistance is poor; (3) as a barrier coating, the micro-arc magnesium oxide coating is easy to generate local corrosion, generate cracks and reduce the corrosion resistance.
In the current research, element and nano-particle doping and surface hole sealing are the main methods for improving the corrosion resistance of the micro-arc magnesium oxide coating. The mechanical stability and corrosion resistance of the micro-arc porous magnesium oxide coating can be improved by doping elements and nano particles; the surface sealing can prevent the corrosive medium from contacting with the magnesium alloy substrate. However, these methods do not fully solve all the problems of the micro-arc porous magnesium oxide coating. Therefore, aiming at the problems of the micro-arc magnesium oxide coating, the development of a novel intelligent anticorrosion method is of great significance. The corrosion reaction in the corrosion process is an important factor influencing the corrosion speed, and the design and the product for improving the corrosion resistance of the sample aiming at the regulation and control of the corrosion reaction are rarely reported.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for improving the corrosion resistance of a micro-arc porous magnesium oxide coating on the surface of magnesium alloy and the micro-arc porous magnesium oxide corrosion-resistant coating prepared by the method.
In a first aspect, the invention provides a method for improving corrosion resistance of a micro-arc porous magnesium oxide coating on a magnesium alloy surface, wherein the phase of the micro-arc porous magnesium oxide coating comprises magnesium oxide; the method comprises the following steps: and soaking the magnesium alloy covered with the micro-arc porous magnesium oxide coating in a manganese ion solution to obtain the porous amorphous hydroxyl manganese oxide coating on the surface of the magnesium alloy.
Preferably, the manganese ion solution is a manganese nitrate and/or manganese chloride solution, and the solvent is water.
Preferably, the porous amorphous metal hydroxyl manganese oxide coating reacts with the micro-arc porous magnesium oxide coating spontaneously to generate Mg/Mn layered double hydroxide in corrosion so as to seal the micropores of the micro-arc porous magnesium oxide coating, thereby improving the corrosion resistance of the micro-arc oxidation coating.
Preferably, the corrosive liquid in the corrosion is salt solution or tap water.
The invention provides a surface modification method for preparing metal oxyhydroxide on the surface of a magnesium alloy micro-arc porous magnesium oxide coating by using a soaking method. The metal oxyhydroxide coating is manganese oxyhydroxide (MnOOH). As the corrosion reaction determines the strength of the corrosion resistance of the modified coating to a great extent, the prepared metal oxyhydroxide can react in the corrosion process of the micro-arc porous magnesium oxide coating to generate a Mg/Mn layered double hydroxide corrosion-resistant coating, thereby improving the corrosion resistance of the micro-arc porous magnesium oxide coating.
More specifically, the micro-arc porous magnesium oxide can dissolve out a large amount of magnesium ions (Mg) in the corrosion process2+) And Hydroxyl (OH)-) This provides conditions for the formation of a layered double hydroxide phase (LDH). The hydroxyl manganese oxide layer formed on the surface of the micro-arc porous magnesium oxide participates in corrosion reaction in the corrosion process and dissolves Mg from the micro-arc porous magnesium oxide coating at room temperature2+And Hydroxyl (OH)-) React to form Mg-Mn Layered Double Hydroxide (LDH) anticorrosive coating and seal the micropores of the micro-arc oxidation coating.
When the sample after micro-arc porous magnesium oxide is soaked in manganese nitrate and/or manganese chloride solution, magnesium oxide is alkaline, and a large amount of hydroxide ions (OH) are generated around the magnesium oxide-) React with free manganese ions to form manganese hydroxide (Mn (OH))2) Manganese hydroxide, however, is unstable and is oxidized by oxygen in the surroundings to manganese oxyhydroxide (MnOOH), specifically as follows: mn2+ +2OH-＝Mn(OH)2，4Mn(OH)2+O2＝4MnOOH+2H2O。
Preferably, the concentration of the manganese ion solution is 2-40 g/L. When the concentration of the manganese ion solution is too low, the content of manganese oxyhydroxide is low, magnesium hydroxide which is an original corrosion product of the micro-arc oxidation coating can be formed in the corrosion process, and the solution of the magnesium hydroxide in the sodium chloride solution is easily converted into soluble magnesium chloride, so that the corrosion resistance is poor. When the concentration of the manganese ion solution is too high, magnesium hydroxide is easily generated in the soaking process, so that LDH (layered double hydroxide) is not formed in the subsequent corrosion process, and the corrosion protection effect cannot be improved.
Preferably, the soaking temperature is 20-40 ℃ at room temperature. The soaking time is 3-9 hours. The soaking time is too short, the manganese content is reduced, and the effect of improving the corrosion resistance cannot be achieved. If the soaking time is too long, a magnesium hydroxide phase is generated in the soaking process, and if the magnesium hydroxide phase is generated, the amorphous manganese oxyhydroxide cannot generate a layered double hydroxide coating in the subsequent corrosion process, so that the effect of improving the corrosion protection cannot be achieved. Preferably, the magnesium alloy sheet with the surface magnesium oxide removed is used as a substrate, 5-15 g/L sodium glycerophosphate and 10-15 g/L potassium hydroxide mixed solution is prepared by using deionized water and is used as electrolyte for micro-arc oxidation, and the micro-arc porous magnesium oxide coating is prepared.
Preferably, the micro-arc oxidation parameters are voltage of 320-360V, current of 0.6-1.0A, duty ratio of 8-12% and frequency of 800-1200 Hz.
Preferably, the aperture range of the micro-arc porous magnesium oxide coating is 0.1-1.8 μm.
In a second aspect, the present invention provides a micro-arc porous magnesium oxide corrosion resistant coating prepared on a magnesium alloy surface by the above method, the micro-arc porous magnesium oxide corrosion resistant coating comprising: the coating comprises a micro-arc porous magnesium oxide coating and an amorphous hydroxyl manganese oxide coating formed on the micro-arc porous magnesium oxide coating in situ.
Preferably, the atomic mass percent of manganese element in the micro-arc porous magnesium oxide anti-corrosion coating is 4.35% >, up to c
15.74％。
Preferably, the total thickness of the micro-arc porous magnesium oxide corrosion-resistant coating is 3-7 microns.
Has the advantages that:
1. the experiment does not need complex equipment, the experimental process is relatively safe, and the large-scale industrialization is facilitated;
2. compared with the magnesium and the alloy surface coating prepared by other methods, the coating provided by the invention is in-situ bonded with the substrate, and has strong bonding force;
3. the metal oxyhydroxide coating prepared by the invention can participate in corrosion reaction in the corrosion process of the micro-arc porous magnesium oxide coating to generate a corrosion product sheet layered double hydroxide instead of magnesium hydroxide and seal the micropores of the micro-arc porous magnesium oxide coating;
4. the prepared metal oxyhydroxide coating which changes the corrosion behavior of the micro-arc porous magnesium oxide coating in the corrosion process can be directly used as an anti-corrosion coating or a pretreatment layer on the surface of magnesium and magnesium alloy, and is expected to be applied to the fields of aerospace, traffic, medical metal materials and the like.
Drawings
FIG. 1 shows a Scanning Electron Micrograph (SEM) and a power spectrum of the surface of a sample in example 1: FIG. 1 (a) is an untreated micro-arc porous magnesium oxide micro-surface of example 1; FIG. 1 (b) is a cross section of untreated micro-arc porous magnesium oxide of example 1; FIG. 1 (c) is the spectrum of untreated micro-arc porous magnesium oxide of example 1; as can be seen from the figure, the surface of the sample is of a porous structure, and the thickness of the coating is about 4 microns.
Fig. 2 shows a spectral profile of the sample surface of example 1. As can be seen from the figure, the magnesium and oxygen elements on the surface of the sample are uniformly distributed, and no manganese element exists.
FIG. 3 shows a Scanning Electron Micrograph (SEM) and a power spectrum of the surface of a sample of example 2: fig. 3 (a) is a manganese oxyhydroxide (MnOOH) microscopic surface prepared by immersion of example 2; fig. 3 (b) is a cross section of manganese oxyhydroxide (MnOOH) prepared by immersion in example 2; fig. 3 (c) is a spectrum of manganese oxyhydroxide prepared by immersion in example 2. As can be seen from the figure, the surface of the sample is of a porous structure, the thickness of the coating is about 4 microns, the coating is not obviously different from the untreated microarc porous magnesium oxide sample in the example 1, and the atomic mass percent of manganese element in the coating is 2.246%.
FIG. 4 shows a spectral profile of the sample surface of example 2; as can be seen from the figure, the magnesium, oxygen and manganese elements on the surface of the sample are uniformly distributed.
FIG. 5 shows a Scanning Electron Micrograph (SEM) and a spectral plot of the surface of the sample of example 3: fig. 5 (a) is a manganese oxyhydroxide (MnOOH) microscopic surface prepared by immersion in example 3; FIG. 5 (b) is a cross-section of manganese oxyhydroxide (MnOOH) prepared by the soaking in example 3; FIG. 5 (c) is a manganese oxyhydroxide energy spectrum prepared by soaking in example 3; as can be seen from the figure, the surface of the sample is in a porous structure, the thickness of the coating is about 4 microns, the coating is not obviously different from the untreated micro-arc porous magnesium oxide sample in the example 1, and the atomic mass percent of manganese element in the coating is 4.350%.
Figure 6 shows a spectral profile of the sample surface of example 3. As can be seen from the figure, the magnesium, oxygen and manganese elements on the surface of the sample are uniformly distributed.
FIG. 7 shows a Scanning Electron Micrograph (SEM) and a spectral plot of the surface of the sample of example 4: fig. 7 (a) is a manganese oxyhydroxide (MnOOH) microscopic surface prepared by immersion in example 4; FIG. 7 (b) is a cross-section of manganese oxyhydroxide (MnOOH) prepared by the soaking in example 4; FIG. 7 (c) is a manganese oxyhydroxide energy spectrum prepared by the soaking in example 4; as can be seen from the figure, the surface of the sample is in a porous structure, the thickness of the coating is about 4 microns, the coating is not obviously different from the untreated micro-arc porous magnesium oxide sample in the example 1, and the atomic mass percent of manganese element in the coating is 5.907%.
Fig. 8 shows a spectral profile of the sample surface of example 4. As can be seen from the figure, the magnesium, oxygen and manganese elements on the surface of the sample are uniformly distributed.
FIG. 9 (a) shows the X-ray diffraction patterns (XRD) of examples 1-4; FIG. 9 (b), (c) and (d) show the XRD pattern, the IR spectrum and the Raman spectrum of the powder test on the surface of the sample prepared in example 4; FIG. 9 (e) shows X-ray photoelectron spectroscopy full spectrum (XPS) of examples 1-4; FIG. 9 (f) shows the high resolution Mn 3s X-ray photoelectron spectroscopy spectra of examples 2 to 4; as can be seen from fig. 9, XRD results show that the manganese-containing coating prepared by the immersion method is amorphous; the infrared spectrum, the Raman spectrum and the XPS test result show that the manganese-containing coating prepared by the soaking method is manganese oxyhydroxide (MnOOH).
FIG. 10 (a), (b), (c), (d), (e), (f) show the corrosion patterns of the sample of example 1 in 0.9 wt% NaCl solution for 4 hours, 1 day, 4 days, 7 days, 14 days and 28 days, respectively; it can be seen that the corrosion was faster for the sample of example 1.
FIG. 11 shows the XRD pattern of corrosion for the sample of example 1 of FIG. 10; it can be seen that the sample of example 1 produced magnesium hydride as a corrosion product during the corrosion process.
FIG. 12 (a), (b), (c), (d), (e), (f) show the corrosion patterns of the sample of example 2 in 0.9 wt% NaCl solution for 4 hours, 1 day, 4 days, 7 days, 14 days and 28 days, respectively; it can be seen that the corrosion was slower for the sample of example 2 than for the sample of example 1.
FIG. 13 shows the XRD pattern for corrosion of the sample of example 2 of FIG. 12; it can be seen that the sample of example 2 does not form a hydrogen-like magnesium oxide phase during the etching process.
FIG. 14 (a), (b), (c), (d), (e), (f) show the corrosion patterns of the sample of example 3 in 0.9 wt% NaCl solution for 4 hours, 1 day, 4 days, 7 days, 14 days and 28 days, respectively; it can be seen that the corrosion was slower for the example 3 sample than for the examples 1 and 2.
FIG. 15 shows the XRD pattern for corrosion of the sample of example 3 of FIG. 14; it can be seen that the sample of example 3 does not produce a hydrogen-like magnesium phase during corrosion and produces an LDH phase.
(a), (b), (c), (d), (e), (f) in FIG. 16 show the corrosion patterns of the sample of example 4 in 0.9 wt% NaCl solution for 4 hours, 1 day, 4 days, 7 days, 14 days and 28 days, respectively; it can be seen that the corrosion was slower for the sample of example 4 than for the samples of example 1, example 2 and example 3.
FIG. 17 shows the XRD pattern of corrosion for the sample of example 4 of FIG. 16; it can be seen that the sample of example 4 does not produce a hydrogen-like magnesium phase during the etching process, and produces an LDH phase.
FIG. 18 (a) shows the polarization plots for the samples of examples 1-4 (tested in 250mL of 0.9 wt% NaCl solution using the CH1760C three-electrode electrochemical workstation); fig. 18 (b) shows the hydrogen release curves of the samples of examples 1 to 4. As can be seen from the graph, as the content of manganese oxyhydroxide (MnOOH) increases, the corrosion current and hydrogen emission of the samples decrease, and the corrosion resistance of the samples increases in turn.
Detailed Description
The present invention will be described in detail by way of examples. It is to be understood that the following examples are illustrative of the present invention and are not to be construed as limiting the scope of the invention, and that insubstantial modifications and adaptations of the invention by those skilled in the art based on the foregoing description are intended to be included within the scope of the invention. The specific process parameters and the like of the following examples are also merely examples of suitable ranges, i.e., those skilled in the art can select from the suitable ranges through the description herein, and are not limited to the specific values exemplified below.
Example 1
(1) A surface oxidation layer of an AZ31 magnesium alloy sheet with the thickness of 2mm and the length and the width of 10mm is removed by 600-mesh SiC abrasive paper, and the sheet is cleaned by ultrasonic cleaning by alcohol to be used as a substrate.
(2) Deionized water is used for preparing a mixed solution of 10g/L sodium glycerophosphate and 12.5g/L potassium hydroxide, and the mixed solution is used as an electrolyte for micro-arc porous magnesium oxide.
(3) The magnesium alloy sheet is electrolyzed in a constant voltage mode, and the parameters are as follows: cut-off voltage 340V, current 0.8A, duty cycle 10%, frequency 1000 Hz. The prepared sample surface is covered with a micro-arc porous magnesium oxide coating, and the mark is PEO.
Example 2
(1) Preparation of 12g/L MnCl by using deionized water2.4H2And (4) O solution.
(2) The magnesium alloy sample after micro-arc porous magnesium oxide in the example 1 is put into the prepared manganese chloride solution for 3 hours. The sample prepared was labeled PEO-Mn 1. SEM results show that the microstructure and section thickness of the sample are not obviously changed compared with the untreated micro-arc porous magnesium oxide sample; XRD and XPS results show that amorphous manganese oxyhydroxide is formed on the surface; the energy spectrum result shows that the manganese element atomic mass percentage of the coating is 2.24 percent, and the coating is uniformly distributed; XRD results show that the prepared modified sample forms a layered double hydroxide phase in the corrosion process; a polarization curve, a soaking experiment and a hydrogen evolution experiment show that the corrosion resistance of a sample is improved by the coating.
Example 3
(1) Preparation of 12g/L MnCl by using deionized water2.4H2And (4) O solution.
(2) The magnesium alloy sample after micro-arc porous magnesium oxide in the example 1 is put into the prepared manganese chloride solution for 6 hours. The sample prepared was labeled PEO-Mn 2. SEM results show that the microstructure and section thickness of the sample are not obviously changed compared with the untreated micro-arc porous magnesium oxide sample; XRD and XPS results show that amorphous manganese oxyhydroxide is formed on the surface; the energy spectrum result shows that the manganese element atomic mass percent of the coating is 4.35%, and the coating is uniformly distributed; XRD results show that the prepared modified sample forms a layered double hydroxide phase in the corrosion process; a polarization curve, a soaking experiment and a hydrogen evolution experiment show that the corrosion resistance of a sample is improved by the coating.
Example 4
(1) Preparation of 12g/L MnCl by using deionized water2.4H2And (4) O solution.
(2) The magnesium alloy sample after micro-arc porous magnesium oxide in the example 1 is put into the prepared manganese chloride solution for 9 hours. The sample prepared was labeled PEO-Mn 3. SEM results show that the microstructure and section thickness of the sample are not obviously changed compared with the untreated micro-arc porous magnesium oxide sample; XRD and XPS results show that amorphous manganese oxyhydroxide is formed on the surface; the energy spectrum result shows that the manganese element atomic mass percent of the coating is 11.89%, and the coating is uniformly distributed; XRD results show that the prepared modified sample forms a layered double hydroxide phase in the corrosion process; the polarization curve, the immersion experiment and the hydrogen evolution experiment show that the corrosion resistance of the sample is improved by the modified coating.
Example 5
(1) Preparation of 2g/L MnCl by using deionized water2.4H2And (4) O solution.
(2) The magnesium alloy sample after micro-arc porous magnesium oxide in the example 1 is put into the prepared manganese chloride solution for 9 hours. SEM results show that the microstructure and section thickness of the sample are not obviously changed compared with the untreated micro-arc porous magnesium oxide sample; XRD and XPS results show that amorphous manganese oxyhydroxide is formed on the surface; the energy spectrum result shows that the mass percentage of manganese element atoms of the coating is 4.320%, and the coating is uniformly distributed; XRD results show that the prepared modified sample forms a layered double hydroxide phase in the corrosion process; the polarization curve, the immersion experiment and the hydrogen evolution experiment show that the corrosion resistance of the sample is improved by the coating.
Example 6
(1) 40g/L MnCl prepared by using deionized water2.4H2And (4) O solution.
(2) The magnesium alloy sample after micro-arc porous magnesium oxide in the example 1 is put into the prepared manganese chloride solution for 9 hours. SEM results show that the microstructure and section thickness of the sample are not obviously changed compared with the untreated micro-arc porous magnesium oxide sample; XRD and XPS show that amorphous manganese oxyhydroxide is formed on the surface; the energy spectrum result shows that the mass percentage of manganese element atoms of the coating is 15.74 percent, and the coating is uniformly distributed; XRD results show that the prepared modified sample forms a layered double hydroxide phase in the corrosion process; the polarization curve, the immersion experiment and the hydrogen evolution experiment show that the corrosion resistance of the sample is improved by the coating.

Claims (10)

1. The method for improving the corrosion resistance of the micro-arc porous magnesium oxide coating on the surface of the magnesium alloy is characterized in that the phase of the micro-arc porous magnesium oxide coating comprises magnesium oxide;
the method comprises the following steps: soaking the magnesium alloy covered with the micro-arc porous magnesium oxide coating in a manganese ion solution to obtain a porous amorphous hydroxyl manganese oxide coating on the surface of the magnesium alloy;
preferably, the manganese ion solution is a manganese nitrate and/or manganese chloride solution, and the solvent is water.
2. The method of claim 1, wherein the porous amorphous metal manganese oxyhydroxide coating reacts spontaneously with the micro-arc porous magnesium oxide coating during corrosion to form a Mg/Mn layered double hydroxide to seal the micro-pores of the micro-arc porous magnesium oxide coating, thereby improving the corrosion resistance of the micro-arc oxidized coating.
3. The method according to claim 1 or 2, wherein the concentration of the manganese ion solution is 2-40 g/L.
4. The method according to any one of claims 1 to 3, wherein the temperature of the soaking is 20 to 40 ℃ and the time of the soaking is 3 to 9 hours.
5. The method according to any one of claims 1 to 4, wherein the micro-arc porous magnesium oxide coating is prepared by using a magnesium alloy sheet with magnesium oxide on the surface removed as a substrate, and using deionized water to prepare a mixed solution of 5 to 15g/L sodium glycerophosphate and 10 to 15g/L potassium hydroxide as an electrolyte for micro-arc oxidation to perform micro-arc oxidation.
6. The method of claim 5, wherein the micro-arc oxidation parameters are: the voltage is 320-360V, the current is 0.6-1.0A, the duty ratio is 8-12%, and the frequency is 800-1200 Hz.
7. The method of any of claims 1-6, wherein the micro-arc porous magnesium oxide coating has a pore size in the range of 0.1-1.8 μm.
8. A micro-arc porous magnesium oxide corrosion-resistant coating prepared on the surface of a magnesium alloy according to the method of any one of claims 1 to 7, wherein the micro-arc porous magnesium oxide corrosion-resistant coating comprises: the coating comprises a micro-arc porous magnesium oxide coating and an amorphous hydroxyl manganese oxide coating formed on the micro-arc porous magnesium oxide coating in situ.
9. The micro-arc porous magnesium oxide corrosion resistant coating of claim 8, wherein the atomic mass percentage of manganese in the micro-arc porous magnesium oxide corrosion resistant coating is 4.35-14.74%.
10. The micro-arc porous magnesium oxide corrosion resistant coating according to claim 8 or 9, wherein the total thickness of the micro-arc porous magnesium oxide corrosion resistant coating is 3 μm to 7 μm.
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