Expanded perlite nanopowder anticorrosive coating and method of making same

Abstract

The application provides an expanded perlite nanopowder anti-corrosion coating and a preparation method thereof. The method comprises the following steps: respectively weighing mixed polyol phosphate and hydrochloric acid, mixing and stirring to obtain acidified polyol phosphate surface modification liquid; respectively weighing expanded perlite nanopowder and the acidified polyol phosphate surface modification liquid, mixing, stirring uniformly, and then performing low-temperature plasma irradiation to obtain a hydrophobic anti-corrosion mixed slurry; filtering the hydrophobic anti-corrosion mixed slurry, drying the obtained solid powder, grinding the powder to obtain anti-corrosion powder, mixing the anti-corrosion powder into epoxy resin, and stirring uniformly, so that the anti-corrosion powder can be sprayed on the surface of a device to construct an expanded perlite nanopowder anti-corrosion coating with super-hydrophobicity. The preparation process is simple, the surface corrosion of high expanded perlite nanopowder and the loading of polyol phosphate are realized. The modified expanded perlite nanopowder can be more stably diffused in the epoxy resin, and the prepared coating has excellent waterproof and anti-corrosion performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of anticorrosive coating, and particularly relates to an expanded perlite nanometer powder anticorrosive coating and a preparation method thereof. BACKGROUND

[0002] Anticorrosive coating is a very important material, and its main function is to protect the metal surface from corrosion. Anticorrosive coating is usually coated on the metal surface to form a protective layer to prevent the metal from directly contacting with the surrounding environment (such as water, air, chemicals, etc.), thereby preventing corrosion. Anticorrosive coating can prevent moisture from entering the metal surface, and can effectively reduce the humidity of the metal surface, thereby reducing the risk of corrosion. The coating can resist the erosion of various chemicals, including acids, bases, salts, etc. In some chemical industry or marine environment, the metal surface may be in contact with various corrosive chemicals. Therefore, anticorrosive coating is widely used in various industrial fields, such as petroleum, chemical industry, power, aviation, ship, etc. By using anticorrosive coating, the surface of the equipment can be effectively protected, the service life of the equipment can be prolonged, and the production efficiency can be improved. In addition, anticorrosive coating can also reduce the maintenance and repair cost of the equipment, and improve the reliability and stability of the equipment.

[0003] Expanded perlite nanometer powder is a kind of perlite powder treated by special process, which has a wide application in the fields of construction, chemical industry, environmental protection, etc. Expanded perlite nanometer powder has good thermal insulation performance, and its thermal conductivity coefficient is much lower than that of traditional thermal insulation materials. In addition, expanded perlite nanometer powder also has good weather resistance and corrosion resistance, and can maintain stability in various harsh environments. Due to these characteristics of expanded perlite nanometer powder, it has a wide application in the fields of construction, chemical industry, environmental protection, etc. In the field of construction, it can be used as thermal insulation material to improve the thermal insulation performance of buildings; in the field of chemical industry, it can be used as catalyst or adsorbent for various chemical reactions; in the field of environmental protection, it can be used for wastewater treatment and air purification. Therefore, expanded perlite nanometer powder has great potential and application prospect in the preparation of anticorrosive coating, and its excellent corrosion resistance, good adhesion, high hardness and wear resistance, environmental protection, low cost and simple preparation process make it an ideal material selection, which is expected to be widely used in various fields.

[0004] However, in the prior art, the preparation process of anticorrosive coating is complicated, and the waterproof and anticorrosion performance of the prepared coating needs to be improved. SUMMARY

[0005] To solve the above technical problems, one of the objects of one embodiment of the present application is to provide a preparation method of an expanded perlite nanopowder anti-corrosion coating, which has a simple preparation process, realizes surface corrosion of high expanded perlite nanopowder and loading of polyol phosphate by mixing and coupling hydrochloric acid and polyol phosphate and low-temperature plasma irradiation. The modified expanded perlite nanopowder can be more stably diffused in epoxy resin, and the prepared coating has excellent waterproof and anti-corrosion properties.

[0006] One of the objects of one embodiment of the present application is to provide an expanded perlite nanopowder anti-corrosion coating prepared by the above preparation method.

[0007] Note that the description of these objects does not hinder the existence of other objects. One embodiment of the present application does not need to achieve all the above objects. The objects other than the above objects can be extracted from the description, drawings, and claims.

[0008] The present application achieves the above technical objects by the following technical means.

[0009] A preparation method of an expanded perlite nanopowder anti-corrosion coating, comprising the following steps:

[0010] Preparation of acidified polyol phosphate surface modification liquid: respectively take a mixed polyol phosphate and hydrochloric acid, stir, and obtain an acidified polyol phosphate surface modification liquid;

[0011] Preparation of hydrophobic anti-corrosion mixed slurry: respectively take expanded perlite nanopowder and the acidified polyol phosphate surface modification liquid, mix, stir uniformly, and then perform low-temperature plasma irradiation to obtain a hydrophobic anti-corrosion mixed slurry;

[0012] Preparation of an expanded perlite nanopowder anti-corrosion coating: filter the hydrophobic anti-corrosion mixed slurry, dry the obtained solid powder, grind the powder, obtain an anti-corrosion powder, mix the anti-corrosion powder into epoxy resin, stir uniformly, and can be sprayed on the surface of a device to construct an expanded perlite nanopowder anti-corrosion coating with superhydrophobicity.

[0013] In the above scheme, the step of preparing the acidified polyol phosphate surface modification liquid is specifically:

[0014] According to the volume ratio (2.5-7.5):100, respectively take a mixed polyol phosphate and hydrochloric acid, stir for 5-15 minutes, and obtain an acidified polyol phosphate surface modification liquid.

[0015] In the above scheme, the concentration of the hydrochloric acid is 0.5-4.5M.

[0016] In the above scheme, the step of preparing the hydrophobic anti-corrosion mixed slurry is specifically:

[0017] According to solid-liquid ratio (0.5-1.5):1 g / mL, the expanded perlite nano powder and the acidified polyol phosphate surface modification liquid are weighed and mixed, stirred uniformly, and then subjected to low temperature plasma irradiation for 0.5-1.5 hours to obtain the hydrophobic corrosion-resistant mixed slurry.

[0018] In the above scheme, the low temperature plasma action voltage is 5-75 kV.

[0019] In the above scheme, the step of preparing the expanded perlite nano powder corrosion-resistant coating is specifically as follows:

[0020] The hydrophobic corrosion-resistant mixed slurry is filtered, and the obtained solid powder is dried and ground to obtain the corrosion-resistant powder.

[0021] The corrosion-resistant powder is mixed into the epoxy resin at a mass-volume ratio of 0.5-1.5 g / mL, and stirred uniformly, which can be sprayed on the surface of a device to construct an expanded perlite nano powder corrosion-resistant coating with superhydrophobicity.

[0022] An expanded perlite nano powder corrosion-resistant coating is prepared according to the preparation method of the expanded perlite nano powder corrosion-resistant coating.

[0023] Preferably, in the present application, the mixed polyol phosphate and hydrochloric acid are weighed and mixed at a volume ratio of (2.5-7.5):100, and stirred for 5-15 minutes to obtain the acidified polyol phosphate surface modification liquid, wherein the concentration of hydrochloric acid is 0.5-4.5 M. According to solid-liquid ratio (0.5-1.5):1 g / mL, the expanded perlite nano powder and the acidified polyol phosphate surface modification liquid are weighed and mixed, stirred uniformly, and then subjected to low temperature plasma irradiation for 0.5-1.5 hours to obtain the hydrophobic corrosion-resistant mixed slurry, wherein the low temperature plasma action voltage is 5-75 kV. The hydrophobic corrosion-resistant mixed slurry is filtered, and the obtained solid powder is dried and ground to obtain the corrosion-resistant powder. The corrosion-resistant powder is mixed into the epoxy resin at a mass-volume ratio of 0.5-1.5 g / mL, and stirred uniformly, which can be sprayed on the surface of a device to construct an expanded perlite nano powder corrosion-resistant coating with superhydrophobicity.

[0024] Reaction mechanism:

[0025] In the low-temperature plasma irradiation process, oxygen and water molecules are ionized and dissociated in the discharge channel to generate hydroxyl radicals, oxygen radicals, hydrogen radicals and hydrated electrons. Hydroxyl radicals and oxygen radicals can strengthen the corrosion and erosion of hydrochloric acid on the expanded perlite nanopowder particles, increase the surface roughness and active sites of the particles, and achieve the hydroxyl-rich surface of the expanded perlite nanopowder particles. Hydrogen radicals and hydrated electrons can strengthen the acidification process of polyol phosphate ester, induce partial hydrolysis and polymerization of polyol phosphate ester, thereby further improving the surface activity of expanded perlite nanopowder particles. The hydroxyl-rich surface of the expanded perlite nanopowder particles is conducive to the efficient loading of acidified polyol phosphate ester on the surface through polymerization and oxygen affinity. The corrosion-resistant powder is mixed with epoxy resin, and the acidified polyol phosphate ester and its polymers loaded on the surface of the corrosion-resistant powder are effectively coupled and dispersed in the epoxy resin.

[0026] Compared with the prior art, the beneficial effects of the present application are:

[0027] The preparation process of the present application is simple, and the surface erosion of high expanded perlite nanopowder and the loading of polyol phosphate ester are realized by mixing and coupling hydrochloric acid and polyol phosphate ester and low-temperature plasma irradiation. The modified expanded perlite nanopowder can be more stably dispersed in the epoxy resin. The prepared coating has excellent waterproof and anticorrosion performance, with a maximum contact angle of 159.4°, a maximum corrosion potential of -1.115V, and a minimum corrosion current density of 2.315 x 10 -12 A / cm 2 .

[0028] Note that the description of these effects does not preclude the existence of other effects. One embodiment of the present application does not necessarily have all the above effects. Effects other than the above can be clearly seen and extracted from the description, drawings, claims, etc. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a flowchart of the treatment method of the present application. DETAILED DESCRIPTION

[0030] The present application will be further described in detail below in conjunction with specific embodiments, but the scope of protection of the present application is not limited thereto. The raw materials, reagents, materials, etc. used in the following examples can be obtained from commercial channels, or can be prepared by conventional methods in the art, unless otherwise specified.

[0031] Example 1 Influence of volume ratio of mixed polyol phosphate ester and hydrochloric acid on the performance of the prepared expanded perlite nanopowder anticorrosion coating

[0032] The mixed polyol phosphate ester and hydrochloric acid were mixed in a volume ratio of 2.5:100, 3.75:100, 5:100, 6.25:100, and 7.5:100, respectively, stirred for 5 minutes to obtain an acidified polyol phosphate ester surface modification liquid, wherein the concentration of hydrochloric acid was 0.5 M. The expanded perlite nano-powder and the acidified polyol phosphate ester surface modification liquid were weighed in a solid-liquid ratio of 0.5:1 g / mL, respectively, mixed, stirred uniformly, and then subjected to low-temperature plasma irradiation for 0.5 hours to obtain a hydrophobic corrosion-resistant mixed slurry, wherein the low-temperature plasma action voltage was 5 kV. The hydrophobic corrosion-resistant mixed slurry was filtered, and the obtained solid powder was dried and ground to obtain a corrosion-resistant powder. The corrosion-resistant powder was mixed into the epoxy resin in a mass-volume ratio of 0.5 g / mL, and stirred uniformly, which can be sprayed on the surface of a device to construct a corrosion-resistant coating with superhydrophobicity.

[0033] Coating wettability test: The wettability of the coating was tested by contact angle. 10 μL of distilled water and n-hexadecane droplets were used in the test, respectively. First, 10 μL of liquid was dropped on the surface of the coating, and then the workbench was adjusted to make the baseline coincide with the interface of the coating, at which time the contact angle data was read.

[0034] Corrosion test: The corrosion resistance of the coating was evaluated by immersion test and neutral salt spray test. In the immersion test, the sample was placed in a beaker containing 150 ml of NaCl solution (3.5 wt%), and was replaced every 3 days. In the neutral salt spray test, the sample was placed at an angle of 45° in a salt spray corrosion tester (Shanghai Guangpin Testing Equipment Manufacturing Co., Ltd.). The sample was continuously exposed to a salt spray of NaCl solution (5.0 wt%) at 35°C. The sample was taken out every certain period of time for dynamic potential polarization curve test.

[0035] Table 1 Effect of volume ratio of mixed polyol phosphate ester and hydrochloric acid on the performance of an expanded perlite nano-powder corrosion-resistant coating

[0036]

[0037] From the results of Table 1, when the polyol phosphate ester and hydrochloric acid are mixed in a volume ratio of 2.5-7.5:100, the hydroxyl radical and oxygen radical can strengthen the corrosion and erosion of the hydrochloric acid on the expanded perlite nanopowder particles during the low-temperature plasma irradiation process, increase the particle surface roughness and surface active sites, and achieve the hydroxyl-rich surface of the expanded perlite nanopowder particles. The hydrogen radical and hydrated electron can strengthen the acidification process of the polyol phosphate ester, induce partial hydrolysis and polymerization of the polyol phosphate ester, and thus further improve the surface activity of the expanded perlite nanopowder particles. The hydroxyl-rich surface of the expanded perlite nanopowder particles is conducive to the efficient loading of the acidified polyol phosphate ester on the surface thereof through polymerization and oxygen affinity. The anticorrosive powder is mixed with the epoxy resin, and the acidified polyol phosphate ester and its polymers loaded on the surface of the anticorrosive powder are effectively coupled and dispersed in the epoxy resin. The prepared expanded perlite nanopowder anticorrosion coating has a contact angle of 152.3° or more, a corrosion potential (V) of -1.314 or more, and a corrosion current density (A / cm 2 ) of 3.214 x 10 -10 .

[0038] Example 2 Effect of solid-liquid ratio of expanded perlite nanopowder and acidified polyol phosphate ester surface modification liquid on performance of prepared expanded perlite nanopowder anticorrosion coating

[0039] The acidified polyol phosphate ester surface modification liquid was prepared by mixing the polyol phosphate ester and hydrochloric acid in a volume ratio of 7.5:100 and stirring for 10 minutes, wherein the concentration of the hydrochloric acid was 2.5 M. The expanded perlite nanopowder and the acidified polyol phosphate ester surface modification liquid were weighed in a solid-liquid ratio of 0.5:1 g / mL, 0.75:1 g / mL, 1:1 g / mL, 1.25:1 g / mL, and 1.5:1 g / mL, respectively, mixed, stirred uniformly, and then subjected to low-temperature plasma irradiation for 1 hour to obtain a hydrophobic anticorrosive mixed slurry, wherein the low-temperature plasma action voltage was 40 kV. The hydrophobic anticorrosive mixed slurry was filtered, and the obtained solid powder was dried and ground to obtain an anticorrosive powder. The anticorrosive powder was mixed into the epoxy resin in a mass-volume ratio of 1 g / mL, and stirred uniformly, which can be sprayed on the surface of a device to construct an anticorrosion coating with superhydrophobicity.

[0040] The coating wettability test and the corrosion test were the same as in Example 1.

[0041] Table 2 Effect of solid-liquid ratio of expanded perlite nanopowder and acidified polyol phosphate ester surface modification liquid on performance of prepared expanded perlite nanopowder anticorrosion coating

[0042]

[0043] From the results of Table 2, it can be seen that after the expanded perlite nano-powder and the acidified polyol phosphate surface modification liquid are weighed and mixed according to the solid-liquid ratio of 0.5-1.5:1 g / mL, the hydroxyl radical and oxygen radical can strengthen the corrosion and erosion of hydrochloric acid on the expanded perlite nano-powder particles during the low-temperature plasma irradiation process, increase the surface roughness and surface active sites of the particles, and realize the hydroxyl enrichment on the surface of the expanded perlite nano-powder particles. The hydrogen radical and hydrated electron can strengthen the acidification process of the polyol phosphate, induce the hydrolysis and polymerization of part of the polyol phosphate, and thus further improve the surface activity of the expanded perlite nano-powder particles. The hydroxyl enrichment on the surface of the expanded perlite nano-powder particles is conducive to the efficient loading of the acidified polyol phosphate on the surface thereof through polymerization and oxygen affinity. The corrosion-resistant powder is mixed with the epoxy resin, and the acidified polyol phosphate and its polymers loaded on the surface of the corrosion-resistant powder are effectively coupled and dispersed into the epoxy resin. The prepared expanded perlite nano-powder corrosion-resistant coating has a contact angle of 154.3° or more, a corrosion potential (V) of-1.212 or more, and a corrosion current density (A / cm 2 ) of 7.216 x 10 -11 .

[0044] Effect of the mass-volume ratio of the corrosion-resistant powder to the epoxy resin on the performance of the prepared expanded perlite nano-powder corrosion-resistant coating

[0045] The mixed polyol phosphate and hydrochloric acid are measured according to the volume ratio of 7.5:100, stirred for 15 minutes, and an acidified polyol phosphate surface modification liquid is obtained, wherein the concentration of hydrochloric acid is 4.5 M. The expanded perlite nano-powder and the acidified polyol phosphate surface modification liquid are weighed according to the solid-liquid ratio of 1.5:1 g / mL, mixed, and stirred uniformly, and then low-temperature plasma irradiation is performed for 1.5 hours to obtain a hydrophobic corrosion-resistant mixed slurry, wherein the low-temperature plasma action voltage is 75 kV. The hydrophobic corrosion-resistant mixed slurry is filtered, the obtained solid powder is dried and ground, and a corrosion-resistant powder is obtained. The corrosion-resistant powder is mixed into the epoxy resin according to the mass-volume ratio of 0.5 g / mL, 0.75 g / mL, 1 g / mL, 1.25 g / mL, and 1.5 g / mL, and stirred uniformly, which can be sprayed on the surface of a device to construct a corrosion-resistant coating with super-hydrophobicity.

[0046] The coating wettability test and the corrosion test are the same as in Example 1.

[0047] Effect of the solid-liquid ratio of the expanded perlite nano-powder and the acidified polyol phosphate surface modification liquid on the performance of the prepared expanded perlite nano-powder corrosion-resistant coating

[0048]

[0049] From the results of Table 3, the anticorrosive powder is mixed into the epoxy resin according to the mass-volume ratio of 0.5-1.5 g / mL, the anticorrosive powder is effectively coupled and dispersed into the epoxy resin through the surface-loaded acidified polyol phosphate ester and its polymer. The prepared one kind of expanded perlite nanometer powder anticorrosion coating contact angle is greater than or equal to 156.1°, the corrosion potential (V) is greater than or equal to-1.143, the corrosion current density (A / cm 2 ) is less than or equal to 5.053*10 -12 .

[0050] The influence of different preparation processes on the performance of the prepared one kind of expanded perlite nanometer powder anticorrosion coating

[0051] The process of the present application: the mixed polyol phosphate ester and hydrochloric acid are respectively taken according to the volume ratio of 7.5:100, mixed and stirred for 15 minutes to obtain the surface modified liquid of acidified polyol phosphate ester, wherein the concentration of hydrochloric acid is 4.5M. The expanded perlite nanometer powder and the surface modified liquid of acidified polyol phosphate ester are respectively weighed according to the solid-liquid ratio of 1.5:1 g / mL, mixed, uniformly stirred, and then subjected to low-temperature plasma irradiation for 1.5 hours to obtain the hydrophobic anticorrosive mixed slurry, wherein the low-temperature plasma action voltage is 75kV. The hydrophobic anticorrosive mixed slurry is filtered, the obtained solid powder is dried and ground to obtain the anticorrosive powder. The anticorrosive powder is mixed into the epoxy resin according to the mass-volume ratio of 1.5 g / mL, uniformly stirred, and can be sprayed on the surface of the device to construct the anticorrosion coating with superhydrophobicity.

[0052] Comparative process 1: the mixed polyol phosphate ester and hydrochloric acid are respectively taken according to the volume ratio of 7.5:100, mixed and stirred for 15 minutes to obtain the surface modified liquid of acidified polyol phosphate ester, wherein the concentration of hydrochloric acid is 4.5M. The expanded perlite nanometer powder and the surface modified liquid of acidified polyol phosphate ester are respectively weighed according to the solid-liquid ratio of 1.5:1 g / mL, mixed and stirred for 1.5 hours to obtain the hydrophobic anticorrosive mixed slurry. The hydrophobic anticorrosive mixed slurry is filtered, the obtained solid powder is dried and ground to obtain the anticorrosive powder. The anticorrosive powder is mixed into the epoxy resin according to the mass-volume ratio of 1 g / mL, uniformly stirred, and can be sprayed on the surface of the device to construct the anticorrosion coating with superhydrophobicity.

[0053] Comparative process 2: the expanded perlite nanometer powder and the hydrochloric acid solution are respectively weighed according to the solid-liquid ratio of 1.5:1 g / mL, mixed and uniformly stirred, and then subjected to low-temperature plasma irradiation for 1.5 hours to obtain the hydrophobic anticorrosive mixed slurry, wherein the concentration of hydrochloric acid is 4.5M and the low-temperature plasma action voltage is 75kV. The hydrophobic anticorrosive mixed slurry is filtered, the obtained solid powder is dried and ground to obtain the anticorrosive powder. The anticorrosive powder is mixed into the epoxy resin according to the mass-volume ratio of 1 g / mL, uniformly stirred, and can be sprayed on the surface of the device to construct the anticorrosion coating with superhydrophobicity.

[0054] Comparative process 3: according to the solid-liquid ratio 1.5:1 g / mL, the expanded perlite nano-powder and water are weighed respectively, mixed, stirred uniformly, then low-temperature plasma irradiation is carried out for 1.5 hours, to obtain the hydrophobic corrosion-resistant mixed slurry, wherein the low-temperature plasma action voltage is 75 kV. The hydrophobic corrosion-resistant mixed slurry is filtered, the obtained solid powder is dried and ground, to obtain the corrosion-resistant powder. According to the mass-volume ratio 1 g / mL, the corrosion-resistant powder is mixed into the epoxy resin, stirred uniformly, which can be sprayed on the surface of the device, to construct the corrosion-resistant coating with super-hydrophobicity.

[0055] The coating wettability test and the corrosion test are the same as example 1.

[0056] Table 4: influence of different preparation processes on the performance of the prepared expanded perlite nano-powder corrosion-resistant coating

[0057]

[0058] From the results in table 4, it can be seen that the performance of the prepared expanded perlite nano-powder corrosion-resistant coating is obviously superior to the waterproof and corrosion-resistant performance of the coating prepared by the comparative process.

[0059] The above series of detailed descriptions are only specific descriptions for the feasible embodiments of the present application, and they are not used to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A method for preparing an expanded perlite nanopowder anticorrosive coating, characterized by, The method comprises the following steps: Preparation of acidified polyol phosphate surface modification solution: mixed polyol phosphate and hydrochloric acid are measured in a volume ratio of (2.5-7.5):100, mixed, and stirred for 5-15 minutes to obtain the acidified polyol phosphate surface modification solution, wherein the concentration of the hydrochloric acid is 0.5-4.5 M; Preparation of hydrophobic corrosion-resistant mixed slurry: expanded perlite nano-powder and the acidified polyol phosphate surface modification solution are weighed in a solid-liquid ratio of (0.5-1.5):1 g / mL, mixed, uniformly stirred, and then subjected to low-temperature plasma irradiation for 0.5-1.5 hours to obtain the hydrophobic corrosion-resistant mixed slurry, wherein the low-temperature plasma action voltage is 5-75 kV; Preparation of the expanded perlite nano-powder corrosion-resistant coating: the hydrophobic corrosion-resistant mixed slurry is filtered, the obtained solid powder is dried and ground into a corrosion-resistant powder, the corrosion-resistant powder is mixed into epoxy resin in a mass-volume ratio of 0.5-1.5 g / mL, and the mixture is uniformly stirred and then sprayed on the surface of a device to construct the expanded perlite nano-powder corrosion-resistant coating with super-hydrophobicity.

2. The method of claim 1, wherein the method is characterized by: The step of preparing the acidified polyol phosphate surface modification solution is specifically as follows: Mixed polyol phosphate and hydrochloric acid are measured in a volume ratio of 7.5:100, mixed, and stirred for 15 minutes to obtain the acidified polyol phosphate surface modification solution.

3. The method of claim 1, wherein the method is characterized by: The concentration of the hydrochloric acid is 4.5 M.

4. The method of claim 1, wherein the method is characterized by: The step of preparing the hydrophobic corrosion-resistant mixed slurry is specifically as follows: Expanded perlite nano-powder and the acidified polyol phosphate surface modification solution are weighed in a solid-liquid ratio of 1.5:1 g / mL, mixed, uniformly stirred, and then subjected to low-temperature plasma irradiation for 1.5 hours to obtain the hydrophobic corrosion-resistant mixed slurry.

5. The method of claim 1, wherein the method is characterized by: The low-temperature plasma action voltage is 75 kV.

6. The method of claim 1, wherein the method is characterized by: The step of preparing the expanded perlite nano-powder corrosion-resistant coating is specifically as follows: The hydrophobic corrosion-resistant mixed slurry is filtered, the obtained solid powder is dried and ground into a corrosion-resistant powder; The corrosion-resistant powder is mixed into epoxy resin in a mass-volume ratio of 1.25 g / mL or 1.5 g / mL, the mixture is uniformly stirred, and then sprayed on the surface of a device to construct the expanded perlite nano-powder corrosion-resistant coating with super-hydrophobicity.

7. An anti-corrosion coating of expanded perlite nanopowder, characterized in that, The expanded perlite nano-powder corrosion-resistant coating is prepared according to the method of any one of claims 1-6.

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