High-strength corrosion-resistant plastic composite material and preparation method thereof

Abstract

The invention discloses a high-strength corrosion-resistant plastic composite material and a preparation method thereof, and relates to the technical field of plastics, the composite material comprises two magnesium alloy layers and a plastic middle layer arranged between the two magnesium alloy layers; a ceramic film layer is arranged on the inner layer of the magnesium alloy layer, and a ceramic-modified aluminum oxide composite film layer is arranged on the outer layer of the magnesium alloy layer; wherein the ceramic film layer is arranged on the inner layer of the magnesium alloy layer, a plurality of micropore structures are arranged on the surface of the ceramic film layer, the bonding strength between the magnesium alloy layer and the plastic middle layer can be enhanced, the overall strength performance is enhanced, the ceramic-modified aluminum oxide composite film layer is arranged on the outer side, the magnesium alloy surface can be protected, and the corrosion resistance of the magnesium alloy surface is improved; the magnesium alloy sheet and the plastic are integrated, so that the composite material has low cost of the plastic and light weight and high strength of the magnesium alloy, and the composite material which has strength and corrosion resistance and is low in cost is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plastics, in particular to a high-strength corrosion-resistant plastic composite material and a preparation method thereof. BACKGROUND

[0002] In the process of modern industrial rapid development, plastic composites have been widely used in many fields due to their unique performance advantages, covering key industries such as aerospace, automobile manufacturing, electronics and electrical appliances, building materials, etc. The requirements for material performance in these fields are increasingly stringent. Not only do materials need to have high strength to withstand complex mechanical loads, but they also need to have excellent corrosion resistance to adapt to various harsh environments, thereby ensuring the reliability and service life of products.

[0003] For example, in the field of aerospace, aircrafts are subjected to high temperature, high pressure, strong radiation and complex chemical environments for a long time. The materials used must have extremely high strength to ensure structural safety, and must be able to effectively resist the corrosion of various corrosive media to maintain the performance stability of the aircraft. In the automobile manufacturing industry, with the intensification of the trend of automobile lightweight, the proportion of plastic composites in automobile parts is increasing. However, during driving, cars will be exposed to various road conditions and weather conditions, such as humidity, salt spray, acid rain, etc. Therefore, materials need to have good corrosion resistance to prevent premature damage of parts and affect the normal operation and safety of cars. In the field of electronics and electrical appliances, plastic composites are often used to manufacture housings, structural parts, etc., which need to withstand certain mechanical stress and prevent corrosion caused by moisture, chemicals, etc. in the environment to ensure the stable operation of electronic devices. Although traditional plastic composites meet the needs of some industrial applications to a certain extent, they still have many limitations when facing higher requirement use scenarios.

[0004] Traditional plastic composites usually take plastic as the matrix and add reinforcing fibers (such as glass fibers, carbon fibers, etc.) to improve strength. However, this enhancement method has certain limitations. On the one hand, the interfacial bonding strength between the fibers and the plastic matrix is limited, and when subjected to a large external force, the fibers are prone to pull out or debond from the matrix, resulting in unsatisfactory strength improvement of the material, which cannot meet the requirements of some high-strength application scenarios such as aerospace structures, high-end automobile parts, etc. On the other hand, simply relying on fiber reinforcement cannot achieve balanced strength in multiple directions, and in complex stress conditions, the material may have local strength deficiency problems, affecting overall performance. At the same time, the corrosion resistance of traditional plastic composites mainly depends on the chemical stability of the plastic matrix itself. Although some plastics have good corrosion resistance, their cost is high and their processing performance is poor, limiting their widespread application. For most commonly used plastic matrices, their corrosion resistance is relatively weak, and when faced with some strong acid, strong base, organic solvent, etc. Corrosive media, swelling, dissolution, aging, etc. Phenomenon occurs, leading to a decline in material performance, and even failure. In addition, traditional plastic composites are prone to form microcracks on the surface during long-term use, and these microcracks will become a channel for the invasion of corrosive media, accelerating the corrosion process of the material and further shortening the service life of the material. SUMMARY

[0005] One of the purposes of the present application is to provide a plastic composite material with high strength and corrosion resistance, which solves the technical problem of how to simultaneously improve the strength performance and corrosion resistance of plastic plates.

[0006] The second purpose of the present application is to provide a preparation method for preparing the above-mentioned plastic composite material.

[0007] The purposes of the present application can be achieved by the following technical solutions: In a first aspect, the present application discloses a plastic composite material with high strength and corrosion resistance, comprising two layers of magnesium alloy layers and a plastic intermediate layer arranged between the two layers of magnesium alloy layers; the inner layer of the magnesium alloy layer is provided with a ceramic membrane layer, and the outer layer is provided with a ceramic-modified alumina composite membrane layer.

[0008] Magnesium alloy, as a lightweight and high-strength metal material, has many excellent properties and great application potential in the field of materials. The density of magnesium alloy is only 1.74-1.90 g / cm 3Magnesium alloy is one of the lightest metal structural materials known, and has high specific strength and specific stiffness; however, magnesium alloy also has some obvious shortcomings, among which poor corrosion resistance is one of the main problems faced by magnesium alloy. Magnesium is a kind of active metal, and has low standard electrode potential, and is easy to react with oxygen, water vapor and the like in air to generate loose magnesium oxide film. The film layer cannot effectively prevent further invasion of the corrosion medium, so that magnesium alloy is easy to corrode in humid environment, salt spray environment and the like, which seriously affects its performance and service life; therefore, a ceramic-modified alumina composite film layer is arranged on the outer layer of the magnesium alloy layer to improve its corrosion resistance, and a ceramic film layer is arranged on the inner layer of the magnesium alloy layer to enhance the bonding strength with the plastic intermediate layer.

[0009] Preferably, the magnesium alloy layer comprises 95-98 parts by weight of metallic magnesium and 2-5 parts by weight of metallic zinc, and the thickness of the magnesium alloy layer is preferably 0.1-1 mm; the magnesium alloy layer can be directly purchased by customizing from an alloy manufacturer, or can be self-made by using semi-solid powder forming technology.

[0010] Preferably, the plastic intermediate layer comprises the following components by weight: 100 parts of PVC resin, 180-220 parts of filler, 5-10 parts of stabilizer, 1-2 parts of lubricant and 8-12 parts of toughening agent.

[0011] More preferably, the filler comprises heavy calcium carbonate and synthetic heavy calcium carbonate in a mass ratio of (3-5):1.

[0012] More preferably, the stabilizer comprises lead salt stabilizer and rare earth stabilizer in a mass ratio of (3-5):2.

[0013] More preferably, the lubricant comprises stearic acid and paraffin in a mass ratio of (6-10):1.

[0014] More preferably, the toughening agent is chlorinated polyethylene (CPE).

[0015] The formula of the plastic intermediate layer adopts a conventional plastic formula, and is low in cost and easy to obtain.

[0016] Preferably, the ceramic film layer and the ceramic-modified alumina composite film layer are both prepared by a micro-arc oxidation process.

[0017] Preferably, the thickness of the plastic intermediate layer is 1-100 mm.

[0018] In the second aspect, the application further discloses a preparation method of the high-strength corrosion-resistant plastic composite material. Step one, through the micro-arc oxidation process, ceramic film layer is plated on both sides of magnesium alloy sheet; two pieces of magnesium alloy sheet plated with ceramic film layer are stacked, and modified alumina film layer is plated on the ceramic film layer outside of the two pieces of magnesium alloy sheet through the micro-arc oxidation process, to obtain ceramic-modified alumina composite film layer; Step two, the raw material components of the plastic intermediate layer are mixed in proportion to obtain mixed molten material; Step three, the mixed molten material is injected between the two pieces of magnesium alloy sheet obtained in step two, and the ceramic-modified alumina composite film layer of the magnesium alloy sheet is located on the outer layer, and after shaping and curing, a high-strength corrosion-resistant magnesium alloy plastic composite material is obtained.

[0019] It can be seen that, in the preparation method of the present application, ceramic film layer is first plated on both sides of the magnesium alloy sheet through the micro-arc oxidation process, then the two pieces of magnesium alloy sheet are stacked to avoid the side of the two pieces of magnesium alloy sheet from being exposed to the electrolyte, and the other side is continuously plated with modified alumina film layer, so that the two pieces of magnesium alloy sheet have one side of ceramic film layer and the other side of ceramic-modified alumina composite film layer, to facilitate better compounding with the plastic intermediate layer.

[0020] The ceramic film layer obtained by the micro-arc oxidation process has a plurality of irregular microporous structures on the surface, so that the bonding strength between the two can be enhanced when compounding with the mixed molten material; the ceramic film layer in the ceramic-modified alumina composite film layer is covered with modified alumina after the hole filling, and a smooth corrosion-resistant film surface is formed on the surface, so that it has excellent corrosion resistance.

[0021] Further, the step one includes the following operation steps: S11, the surface of the magnesium alloy sheet is pre-cleaned to remove the surface oxide film and stains; S12, in the micro-arc oxidation equipment, a metal plate is used as the cathode, the magnesium alloy sheet is used as the anode, a silicate system electrolyte is used, the electrolyte is stirred after power on, the magnesium alloy sheet surface is observed to have obvious arc light, the power is turned off after waiting for 10-15 min, and the ceramic film layer is prepared on both sides of the magnesium alloy sheet; S13, the magnesium alloy sheet as the anode is taken down, cut into two pieces of the same size, stacked as the anode, then modified alumina is added to the electrolyte, the electrolyte is stirred after power on, and the power is turned off after 15-20 min of reaction, to obtain the ceramic-modified alumina composite film layer on the outer layer of the two pieces of magnesium alloy sheet.

[0022] Preferably, in step S12, the method for pre-cleaning the surface of the magnesium alloy sheet is to polish both sides of the magnesium alloy sheet with sandpaper to remove the surface oxide film, and then ultrasonic cleaning for 10 min to remove the surface stains.

[0023] Preferably, in step S12, the silicate system electrolyte comprises components with the following concentrations: 5-10 g / L of K2SiO3, 4-6 g / L of Na2O2, 0.5-1 g / L of NaF, 2-3 g / L of CH3COONa; the pH value of the silicate system electrolyte is 11-13, and the temperature is 20-50℃. More preferably, the silicate system electrolyte comprises components with the following concentrations: 8 g / L of K2SiO3, 5 g / L of Na2O2, 0.8 g / L of NaF, 2.5 g / L of CH3COONa; the pH value of the silicate system electrolyte is 12, and the temperature is 25℃.

[0024] Preferably, in step S12, the process parameters of micro-arc oxidation are: current density 5-10 A / dm2, frequency 500-700 Hz, and power supply voltage 20-30 kW. More preferably, the process parameters of micro-arc oxidation are: current density 8 A / dm2, frequency 600 Hz, and power supply voltage 25 kW.

[0025] Preferably, the modified alumina is prepared from alumina grafted with silane coupling agent, and the concentration of the modified alumina in the electrolyte is 5-10 g / L, preferably 8 g / L.

[0026] Preferably, the modified alumina is the product of alumina grafted with silane coupling agent, which can be directly purchased or self-prepared.

[0027] Preferably, the self-preparation method of the modified alumina comprises the following steps: SA1, add anhydrous ethanol to isopropyl aluminum at 0-5℃ and stir until completely dissolved to obtain solution A; mix H2O, concentrated HNO3 and anhydrous ethanol and stir uniformly to obtain solution B; SA2, under nitrogen protection at 0-5℃, drop solution B into solution A while stirring, continue stirring for 30 min after the drop is completed to obtain a milky white sol, and then warm up to 75-85℃ and continue stirring until transparent to obtain a transparent sol; SA3, after the transparent sol is cooled to room temperature, dehydration is performed, and then mixed with silane coupling agent for 6-8 h, centrifuged, washed, dried, and ground after the reaction solution is cooled to obtain powder-like modified alumina.

[0028] The beneficial effects of this invention are as follows: The high-strength, corrosion-resistant plastic composite material of this invention consists of two magnesium alloy layers and a plastic intermediate layer disposed between the two magnesium alloy layers. The inner layer of the magnesium alloy layer is provided with a ceramic film layer, the surface of which has a number of microporous structures, which can enhance the bonding strength with the plastic intermediate layer and enhance the overall strength performance. The outer layer is provided with a ceramic-modified alumina composite film layer, which can protect the magnesium alloy surface and improve its corrosion resistance. By integrating the magnesium alloy sheet with the plastic, the composite material combines the low cost of plastic with the lightweight and high strength of magnesium alloy, thus obtaining a composite material that has both strength and corrosion resistance and is inexpensive. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Unless otherwise specified, the materials and reagents used in the following examples are commercially available.

[0031] Preparation Example 1

[0032] The modified alumina was prepared by following these steps: SA1. Add 10g of isopropanol to a 250mL dry three-necked flask, cool to 2℃ in an ice bath, then add 100mL of anhydrous ethanol, and stir magnetically at 500rpm for 20min to obtain a transparent solution A; add 15mL of water, 0.5mL of 65% concentrated HNO3 and 100mL of anhydrous ethanol to a beaker, stir well and then transfer to a constant pressure funnel. SA2. Under the protection of nitrogen in an ice bath at 0-5℃, add solution B dropwise to solution A while stirring. After the addition is complete, continue stirring for 30 minutes to obtain a milky white sol. Then, heat to 80℃ and continue stirring until transparent to obtain a transparent sol. After the SA3 transparent sol was cooled to room temperature, it was transferred to a rotary evaporator for dehydration, and then transferred to a three-necked flask. 0.5 g of APTES (γ-aminopropyltriethoxysilane) was added, and the mixture was stirred at 600 rpm for 7 h. After the reaction solution was cooled, it was centrifuged, washed (washed three times with ethanol), dried, and ground to obtain powdered modified alumina.

[0033] Example 1

[0034] Preparation of high-strength corrosion-resistant plastic composite material, according to the following steps in turn: Step one, using sandpaper polishing magnesium alloy sheet (mass ratio of Mg: Zn = 96:3, size of 8cm 8cm 0.2mm) two sides, and then ultrasonic cleaning for 10 min; in the micro-arc oxidation equipment, with stainless steel plate as cathode, magnesium alloy sheet as anode, using silicate electrolyte, silicate electrolyte includes the following concentration of components: 8g / L of K2SiO3, 5g / L of Na2O2, 0.8g / L of NaF, 2.5g / L of CH3COONa, its pH value is 12, temperature is 25 DEG C; after power on, keep stirring on electrolyte, current density 8A / dm2, frequency 600Hz, power voltage 25kW; when the magnesium alloy sheet surface see obvious arc light, wait for 12 min after power off, on both sides of the magnesium alloy sheet prepared ceramic membrane layer; take down the anode magnesium alloy sheet, cut it into two pieces of the same size (8cm 4cm 0.2mm), overlap as anode, then add 8g / L of modified alumina prepared in preparation example 1 to the electrolyte, keep stirring on electrolyte after power on, power off after 18 min of reaction, get ceramic-modified alumina composite membrane layer on the outer layer of the two magnesium alloy sheets; Step two, put PVC resin 100g, heavy calcium carbonate 160g, synthetic heavy calcium 40g, lead salt stabilizer (tribasic lead sulfate) 4g, rare earth stabilizer (XT-1) 2g, stearic acid 1.35g, paraffin 0.15g, CPE 10g into the mixer, heat to 105 DEG C and stir for 1h, then heat to 115 DEG C and stir for 1h, get mixed melt; Step three, inject the mixed melt between the two magnesium alloy sheets obtained in step two (first place the ceramic membrane layer of one magnesium alloy sheet upwards, spread the mixed melt on the ceramic membrane layer with a thickness of 5mm, then place the ceramic membrane layer of another magnesium alloy sheet downwards on the spread mixed melt, scrape off the mixed melt overflowed from the side), make the ceramic-modified alumina composite membrane layer of magnesium alloy sheet located on the outer layer, after setting and curing, get high-strength corrosion-resistant magnesium alloy plastic composite material.

[0035] Example 2

[0036] Preparation of high-strength corrosion-resistant plastic composite, compared with example 1, the difference is only in step two: the PVC resin 100g, heavy calcium carbonate 144g, synthetic heavy calcium 36g, lead salt stabilizer 3g, rare earth stabilizer 2g, stearic acid 0.875g, paraffin 0.125g, CPE 8g is placed in the mixer, after heating to 105℃, stirring 1h, heating to 115℃, stirring 1h, get mixed melt; Other steps and conditions remain the same, finally prepared magnesium alloy plastic composite.

[0037] Example 3

[0038] Preparation of high-strength corrosion-resistant plastic composite, compared with example 1, the difference is only in step two: the PVC resin 100g, heavy calcium carbonate 176g, synthetic heavy calcium 44g, lead salt stabilizer 6g, rare earth stabilizer 4g, stearic acid 1.75g, paraffin 0.25g, CPE 12g is placed in the mixer, after heating to 105℃, stirring 1h, heating to 115℃, stirring 1h, get mixed melt; Other steps and conditions remain the same, finally prepared magnesium alloy plastic composite.

[0039] Example 4

[0040] Preparation of high-strength corrosion-resistant plastic composite, compared with example 1, the difference is only in step one, in the electrolyte, adding 5g / L of modified alumina prepared in preparation example 1, other steps and conditions remain the same, finally prepared magnesium alloy plastic composite.

[0041] Example 5

[0042] Preparation of high-strength corrosion-resistant plastic composite, compared with example 1, the difference is only in step one, in the electrolyte, adding 10g / L of modified alumina prepared in preparation example 1, other steps and conditions remain the same, finally prepared magnesium alloy plastic composite.

[0043] Comparative example 1

[0044] Preparation of high-strength corrosion-resistant plastic composite, compared with example 1, the difference is only in step one: using sandpaper to polish magnesium alloy sheet (8cm 8cm 0.2mm) on both sides, and then cleaned by ultrasonic wave for 10 min; in the micro-arc oxidation equipment, using stainless steel plate as cathode and magnesium alloy sheet as anode, using silicate electrolyte, the silicate electrolyte includes components with the following concentrations: 8 g / L of K2SiO3, 5 g / L of Na2O2, 0.8 g / L of NaF, 2.5 g / L of CH3COONa, with pH value of 12 and temperature of 25°C; after power on, keep stirring the electrolyte, with current density of 8 A / dm2, frequency of 600 Hz, and power voltage of 25 kW; after obvious arc light appears on the surface of the magnesium alloy sheet, wait for 12 min and then turn off the power, ceramic film layer is prepared on both sides of the magnesium alloy sheet; Other steps and conditions remain the same, and finally the magnesium alloy plastic composite material is prepared.

[0045] Comparative Example 2

[0046] Preparation of high-strength corrosion-resistant plastic composite material, compared with Example 1, the only difference is that step one is: polishing the magnesium alloy sheet (8 cm 8 cm 0.2mm) on both sides, and then cleaned by ultrasonic wave for 10 min; in the micro-arc oxidation equipment, using stainless steel plate as cathode and magnesium alloy sheet as anode, using silicate electrolyte, the silicate electrolyte includes components with the following concentrations: 8 g / L of K2SiO3, 5 g / L of Na2O2, 0.8 g / L of NaF, 2.5 g / L of CH3COONa, with pH value of 12 and temperature of 25°C; after power on, keep stirring the electrolyte, with current density of 8 A / dm2, frequency of 600 Hz, and power voltage of 25 kW; after obvious arc light appears on the surface of the magnesium alloy sheet, wait for 12 min and then turn off the power, ceramic film layer is prepared on both sides of the magnesium alloy sheet; then 8 g / L of modified alumina prepared in Preparation Example 1 is added to the electrolyte, after power on, keep stirring the electrolyte, and after 15-20 min of reaction, turn off the power, ceramic-modified alumina composite film layer is obtained on the inner and outer layers of the two magnesium alloy sheets; other steps and conditions remain the same, and finally the magnesium alloy plastic composite material is prepared.

[0047] The magnesium alloy plastic composite materials prepared in Examples 1-5 and Comparative Examples 1-2 are tested for performance, including strength test and corrosion resistance test, and the test method is as follows: Tensile strength: refer to ASTM D638; Bending strength: refer to ASTM D790; Impact strength: refer to ASTM D256; Corrosion resistance: refer to GB / T 6461 for salt spray test.

[0048] The test results are listed in Table 1, and Table 1 is as follows: Table 1

[0049] According to the analysis of the data in Table 1, compared with Comparative Example 1-2, the magnesium alloy plastic composite prepared in Example 1-5 has both significantly stronger strength performance and corrosion resistance.

[0050] Specifically, in Comparative Example 1, both sides of the magnesium alloy sheet are provided with ceramic film layers, so that the outer layer of the composite material is only protected by the ceramic film layer, and the micropores on the ceramic film layer are numerous, so that the corrosion resistance is greatly reduced, and the mechanical strength is slightly reduced. In Comparative Example 2, both sides of the magnesium alloy sheet are provided with ceramic-modified alumina composite film layers, and at this time, the inner layer combined with the plastic intermediate layer lacks high roughness formed by micropores, so the bonding performance with the plastic intermediate layer will be significantly weakened, the mechanical properties will decrease, but the corrosion resistance can remain unchanged.

[0051] The above describes one embodiment of the present application in detail, but the content described is only a preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the patent scope of the present application.

Claims

1. A high-strength, corrosion-resistant plastic composite material, characterized in that, It includes two magnesium alloy layers and a plastic intermediate layer disposed between the two magnesium alloy layers; the inner layer of the magnesium alloy layer is provided with a ceramic film layer, and the outer layer of the magnesium alloy layer is provided with a ceramic-modified alumina composite film layer.

2. The high-strength, corrosion-resistant plastic composite material according to claim 1, characterized in that, The magnesium alloy layer comprises 95-98 parts by weight of metallic magnesium and 2-5 parts by weight of metallic zinc.

3. The high-strength, corrosion-resistant plastic composite material according to claim 1, characterized in that, The plastic intermediate layer comprises the following components by weight: 100 parts PVC resin, 180-220 parts filler, 5-10 parts stabilizer, 1-2 parts lubricant, and 8-12 parts toughening agent.

4. The high-strength, corrosion-resistant plastic composite material according to claim 1, characterized in that, Both the ceramic film and the ceramic-modified alumina composite film were prepared by micro-arc oxidation process.

5. The high-strength, corrosion-resistant plastic composite material according to claim 1, characterized in that, The thickness of the magnesium alloy layer is 0.1-1mm, and the thickness of the plastic intermediate layer is 1-100mm.

6. A method for preparing a high-strength, corrosion-resistant plastic composite material, used to prepare the high-strength, corrosion-resistant plastic composite material as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Apply ceramic film to both sides of magnesium alloy sheet using micro-arc oxidation process; stack two magnesium alloy sheets coated with ceramic film, and continue to apply modified alumina film to the ceramic film on the outer side of the two magnesium alloy sheets using micro-arc oxidation process to obtain ceramic-modified alumina composite film. Step 2: Mix the raw material components of the plastic intermediate layer in a certain proportion to obtain a mixed melt. Step 3: Pour the mixed molten material between the two magnesium alloy sheets obtained in Step 2, so that the ceramic-modified alumina composite film layer of the magnesium alloy sheet is on the outer layer. After shaping and curing, a high-strength and corrosion-resistant magnesium alloy plastic composite material is obtained.

7. The method for preparing the high-strength, corrosion-resistant plastic composite material according to claim 6, characterized in that, Step one includes the following steps: S11. Pre-clean the surface of the magnesium alloy sheet to remove the oxide film and stains. S12. In the micro-arc oxidation equipment, a metal plate is used as the cathode and a magnesium alloy sheet is used as the anode. A silicate system electrolyte is used. After the power is turned on, the electrolyte is stirred. When obvious arc light is seen on the surface of the magnesium alloy sheet, the power is turned off after 10-15 minutes. A ceramic film layer is formed on both sides of the magnesium alloy sheet. S13. Remove the magnesium alloy sheet from the anode, cut it into two pieces of the same size, stack them together as the anode, then add modified alumina with a concentration of 5-10 g / L to the electrolyte, keep stirring the electrolyte after powering on, and turn off the power after reacting for 15-20 minutes. A ceramic-modified alumina composite film layer is obtained on the outer layer of the two magnesium alloy sheets.

8. The method for preparing the high-strength, corrosion-resistant plastic composite material according to claim 7, characterized in that, In step S12, the silicate system electrolyte comprises the following components at the following concentrations: 5-10 g / L K2SiO3, 4-6 g / L Na2O2, 0.5-1 g / L NaF, and 2-3 g / L CH3COONa; the pH value of the silicate system electrolyte is 11-13, and the temperature is 20-50℃.

9. The method for preparing the high-strength, corrosion-resistant plastic composite material according to claim 7, characterized in that, In step S12, the process parameters for micro-arc oxidation are: current density 5-10A / dm2, frequency 500-700Hz, and power supply voltage 20-30kW.

10. The method for preparing the high-strength, corrosion-resistant plastic composite material according to claim 7, characterized in that, The modified alumina is a product of alumina grafted with silane coupling agent.

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