A method for preparing a conductive anti-corrosion coating with a brick-mud structure on an aluminum surface

Abstract

The invention discloses a preparation method of a conductive anti-corrosion coating with a brick-mud structure for an aluminum surface. First, a high-conductive ceramic filler with a lamellar structure is prepared by controlling the addition of metal salts, urea content and ball milling parameters; secondly, the high-conductive ceramic filler, a defoaming agent and a leveling agent are added to a solvent, and the ceramic coating is obtained through ultrasound, oscillation and water bath treatment; then, the surface of the metal aluminum is negatively charged by etching with an alkaline solution, washing with deionized water and immersing in a polyanionic conductive polymer solution; finally, the conductive ceramic coating is spin-coated on the surface of the metal aluminum, and the conductive anti-corrosion coating with a brick-mud structure is obtained through heat curing treatment; the lamellar-structured high-conductive ceramic filler in the coating is beneficial to improving the conductivity and uniformity of the ceramic coating, and through strong electrostatic attraction with the negatively charged aluminum surface and heat curing treatment, the subsequent coating process is promoted to form a brick-mud structure, thereby achieving the effects of high conductivity, good corrosion resistance and good bonding strength of the coating.

Description

Technical Field

[0001] The invention belongs to the technical field of metal surface coatings, and in particular relates to a method for preparing a conductive anti-corrosion coating with a brick-mud structure on an aluminum surface. Background Art

[0002] In today's industrial field, the corrosion resistance and electrical conductivity of metal materials are crucial. Especially in the field of electricity, metal aluminum cable shielding, as an important component of wires and cables, usually needs to have high conductivity and corrosion resistance to ensure the quality of electrical signal transmission and extend service life. At present, research on metal surface coatings mainly focuses on traditional organic coatings and metal electroplating, such as polymer coatings and chromate electroplating. However, these traditional methods have limitations in conductivity and corrosion resistance, and it is difficult to meet the requirements of metal aluminum cable shielding. Therefore, it is imperative to study a new coating preparation method with a unique structure, high conductivity and corrosion resistance.

[0003] The Chinese patent "Method for Preparing a Cathodic Protection Composite Conductive Anti-corrosion Coating for Aluminum Surfaces" (Application Number: 202410097473.1, Publication Number: CN118027808 A) discloses a method for preparing a cathodic protection composite conductive anti-corrosion coating for aluminum surfaces. By utilizing the synergistic effects of an anodic sacrificial filler, a conductive anti-corrosion filler, a silane coupling agent, and a polymer, an aligned anti-corrosion graphene layer is prepared within the coating, imparting both conductive and anti-corrosion properties. However, oxidation protection by the anodic sacrificial filler is detrimental to conductivity and hinders long-term protection.

[0004] The Chinese patent "A Method for Preparing an Anti-Friction Self-Healing Conductive Anti-Corrosion Coating and Coating" (Application Number: 202410271528.6, Publication Number: CN118006195 A) discloses a method for preparing an anti-friction self-healing conductive anti-corrosion coating and coating. By adding highly conductive MXene and self-healing microcapsules to the anti-corrosion coating, the coating's anti-friction, self-healing, and anti-corrosion capabilities are significantly enhanced. However, the titanium element in the two-dimensional MXene flakes can absorb oxygen. When oxidized, the titanium element forms titanium dioxide particles, which enhance the anti-corrosion properties, but weaken the coating's conductivity.

[0005] The Chinese patent "A Modified Polyurea-Based Conductive Anticorrosion Coating, Its Preparation Method, and Application" (Application Number: 202311627526.8, Publication Number: CN 117903669 A) discloses a modified polyurea-based conductive anticorrosion coating, its preparation method, and application. By adding conductive fillers composed primarily of conductive carbon black and supplemented with polyaniline and AZO, the coating utilizes amino groups carried by the polyaniline and amino groups introduced by the modified AZO to chemically graft onto the polyurea backbone during the curing process, resulting in improved conductivity and adhesion, thereby enhancing the coating's corrosion resistance. However, conductive carbon black easily agglomerates, resulting in poor adhesion between the coating and the substrate. Summary of the Invention

[0006] In response to the problems existing in the prior art, the present invention proposes a method for preparing a conductive anti-corrosion coating with a brick-mud structure on an aluminum surface, focusing on simultaneously improving the conductivity and corrosion resistance of the coating. The method is suitable for protecting the shielding layer of metal aluminum cables and solves the problem that traditional anti-corrosion coatings cannot meet the balance between the conductivity and corrosion resistance of the shielding layer of metal aluminum cables.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for preparing a conductive anti-corrosion coating having a brick-mud structure on an aluminum surface comprises the following steps:

[0009] Step 1, preparing a highly conductive ceramic filler having a lamellar structure;

[0010] Ceramic powder, metal salt, urea and grinding balls are mixed in proportion and ball-milled, and then dissolved in deionized water, dialyzed, centrifuged and vacuum-dried to obtain a highly conductive ceramic filler with a lamellar structure; the amount of each material is as follows: 15%-20% ceramic powder, 1%-5% metal salt, 30%-40% urea and 40%-45% grinding balls, and the total amount of the above materials is 100%; the ceramic powder is any one of Ti3AlC2, TiCr2C2, V2C, and MoAlB, and the metal salt is any one of nickel chloride, copper chloride, ferric chloride, and silver chloride;

[0011] Step 2, preparing a highly conductive ceramic coating;

[0012] The highly conductive ceramic filler with a lamellar structure, a defoamer, and a leveling agent obtained in step 1 are added to a solvent, and subjected to ultrasonic, oscillation, and water bath treatment to obtain a ceramic coating;

[0013] Step 3, negative charge treatment of the aluminum substrate surface;

[0014] The aluminum substrate is ultrasonically cleaned in an organic solvent, then etched with an alkaline solution, cleaned with deionized water, and immersed in a polyanionic conductive polymer solution to obtain an aluminum substrate with a negative charge;

[0015] Step 4, preparing a conductive anti-corrosion coating for a brick-mud structure;

[0016] The highly conductive ceramic coating obtained in step 2 is spin-coated on the negatively charged aluminum substrate obtained in step 3, and subjected to heat curing treatment to obtain a brick-mud structure conductive anti-corrosion coating.

[0017] Furthermore, the grinding balls are silicon nitride with a diameter of 5-10 mm; the dialysis bag used in the dialysis has a molecular weight cutoff of 3500-4000, and the dialysis time is 6-12 h; the centrifugal speed is 3500-11000 rpm, and the centrifugation time is 15-30 min; the vacuum drying temperature is 30-40°C, and the time is 5-10 h.

[0018] Furthermore, the ball milling treatment time in step 1 is 12-36 h, and the ball milling speed is 400-1000 rpm.

[0019] Furthermore, the mass ratio of the highly conductive ceramic filler, defoaming agent, leveling agent and solvent in step 2 is 1-3:0.1-0.5:0.1-0.5:3-5.

[0020] Furthermore, the defoaming agent in step 2 is any one of polyaniline, polystyrene sulfonate, and polyacrylamide; the leveling agent is any one of methyl methacrylate polymer, isopentyl 2-ethylhexanoate polymer, and perfluorooctyl vinyl ether polymer; and the solvent is any one of methyl pyrrolidone, dimethylformamide, and dimethyl sulfoxide.

[0021] Furthermore, the ultrasonic and oscillation treatment time in step 2 is 0.5-1 h, and the water bath treatment temperature is 30-60° C. and the time is 1-5 h.

[0022] Furthermore, the organic solvent in step 3 is any one of acetone and ethanol; the alkaline solution is any one of NaOH and KOH, with a concentration of 0.5-2.5 mol / L; the etching time is 10-60 s; the polyanionic conductive polymer solution is any one of polystyrene sulfonate, polypropylene sulfonate, and polystyrene sulfonate solution, and the mass proportion of the polyanionic conductive polymer solution is 5-10%; the immersion time is 0.5-2h.

[0023] Furthermore, the spin coating speed in step 4 is 1000-2500 rpm; the thermal curing temperature is 80-120° C., and the thermal curing time is 1-10 h.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention provides a method for preparing a conductive, anti-corrosion coating with a brick-and-mortar structure for aluminum surfaces. The method utilizes a highly conductive ceramic filler with a lamellar structure to improve the conductivity and uniformity of the ceramic coating. Strong electrostatic attraction to the negatively charged aluminum surface and thermal curing facilitate the subsequent coating process, forming a "brick-and-mortar structure" and achieving the beneficial effects of high conductivity, excellent corrosion resistance, and strong adhesion. The conductive, anti-corrosion coating prepared by this invention addresses the inability of existing coatings to effectively balance aluminum conductivity and corrosion resistance, and has significant application prospects in aluminum cable shielding. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional schematic diagram of a conductive anti-corrosion coating with a brick-mud structure prepared by the present invention;

[0027] In the accompanying drawings, 1 is a highly conductive ceramic filler with a lamellar structure; 2 is a polyanionic conductive polymer; and 3 is a matrix aluminum. DETAILED DESCRIPTION

[0028] To facilitate understanding of the features and effects of the present invention by those skilled in the art, the following provides a general description and definition of the terms and expressions used in the specification and claims. Unless otherwise indicated, all technical and scientific terms used herein have the ordinary meanings as understood by those skilled in the art regarding the present invention. In the event of conflict, the definitions in this specification shall prevail.

[0029] The theories or mechanisms described and disclosed herein should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0030] All features, such as values, amounts, contents, and concentrations, described herein as numerical ranges or percentage ranges are provided for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to include and specifically disclose all possible subranges and individual values ​​within the range (including integers and fractions).

[0031] In this document, unless otherwise specified, “include,” “including,” “contains,” “has” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0032] In this document, for the sake of brevity, not all possible combinations of the various technical features in each embodiment or example are described. Therefore, as long as there are no contradictions in the combination of these technical features, the various technical features in each embodiment or example can be combined in any way, and all possible combinations should be considered to be within the scope of this specification.

[0033] The present invention provides a method for preparing a conductive anti-corrosion coating having a brick-mud structure on an aluminum surface, which specifically comprises the following steps:

[0034] Step 1, preparing a highly conductive ceramic filler with a lamellar structure;

[0035] 15%-20% ceramic powder, 1%-5% metal salt, 30%-40% urea and 40%-45% silicon nitride grinding balls are placed in a ball mill and ball milled at a speed of 400-1000 rpm for 12-36 hours. The mixture is then dissolved in deionized water, dialyzed in a dialysis bag with a molecular weight cutoff of 3500-4000 for 6-12 hours, centrifuged at a speed of 3500-11000 rpm for 15-30 minutes, and vacuum dried at 30-40°C for 5-10 hours to obtain a highly conductive ceramic filler with a lamellar structure. The grinding balls have a diameter of 5-10 mm, the total mass fraction of the ceramic powder, metal salt, urea and grinding balls is 100%, the ceramic powder is any one of Ti3AlC2, TiCr2C2, V2C and MoAlB, and the metal salt is any one of nickel chloride, copper chloride, ferric chloride and silver chloride.

[0036] Step 2, preparing a highly conductive ceramic coating;

[0037] The lamellar highly conductive ceramic filler, defoamer, and leveling agent in step 1 are added to a solvent, subjected to ultrasound and vibration, and then placed in a water bath for water bath treatment to obtain a highly conductive ceramic coating. The mass ratio of the highly conductive ceramic filler, defoamer, leveling agent, and solvent is 1-3:0.1-0.5:0.1-0.5:3-10; the defoamer is any one of polyaniline, polystyrene sulfonate, and polyacrylamide; the leveling agent is any one of methyl methacrylate polymer, 2-ethylhexanoate isopentyl polymer, and perfluorooctyl vinyl ether polymer; the solvent is any one of methyl pyrrolidone, dimethylformamide, and dimethyl sulfoxide; the ultrasound and vibration treatment time is 0.5-1 h; the water bath treatment temperature is 30-60°C and the time is 1-5 h;

[0038] Step 3: Negative charge treatment on the aluminum substrate surface

[0039] The aluminum substrate is ultrasonically cleaned in an organic solvent for 30 minutes, etched with an alkaline solution for 10-60 seconds, rinsed with deionized water, and immersed in a 5-10% polyanionic conductive polymer solution for 0.5-2 hours to obtain an aluminum substrate with a negative charge. The organic solvent is any one of acetone and ethanol; the alkaline solution is any one of NaOH and KOH with a concentration of 0.5-2.5 mol / L; the polyanionic conductive polymer solution is any one of polystyrene sulfonate, polypropylene sulfonate, or polystyrene sulfonate solution.

[0040] Step 4: Prepare a conductive anti-corrosion coating for brick and mud structures

[0041] The highly conductive ceramic coating prepared in step 2 is spin-coated on a negatively charged aluminum substrate and heat-cured at 80-120°C for 1-10 hours to obtain a conductive anti-corrosion coating for a masonry structure. The spin-coating speed is 1000-2500 rpm.

[0042] Figure 1 This is a cross-sectional schematic diagram of the conductive anti-corrosion coating with a brick-mud structure prepared by the present invention. As can be seen from the figure, a conductive anti-corrosion coating is attached to the base aluminum 3, and the cross-section of the conductive anti-corrosion coating with a brick-mud structure is composed of a highly conductive ceramic filler 1 with a lamellar structure and a polyanionic conductive polymer 2 from top to bottom.

[0043] The disclosed method for preparing a conductive, brick-mud-structured, anticorrosive coating for aluminum surfaces produces a large amount of highly conductive ceramic fillers with a lamellar structure by controlling the addition of metal salts and urea and the high-energy ball milling time, thereby improving the coating's conductivity and uniformity. By etching the aluminum substrate surface and adjusting the concentration and immersion time of a polyanionic conductive polymer solution, a negatively charged aluminum surface is obtained, enabling strong electrostatic bonding with the highly conductive ceramic coating, significantly enhancing the coating's bonding strength. Combined with a thermal curing process, a conductive, brick-mud-structured, anticorrosive coating is formed on the aluminum surface, achieving a high-quality coating with high conductivity, strong corrosion resistance, and excellent uniformity.

[0044] A method for preparing a conductive anti-corrosion coating with a brick-mud structure on an aluminum surface, wherein a highly conductive ceramic filler with a lamellar structure is used to improve the conductivity and uniformity of the ceramic coating and promote the subsequent coating process. Through strong electrostatic attraction and thermal curing with the negatively charged aluminum surface, a "brick-mud structure" is formed, achieving the beneficial effects of high conductivity, good corrosion resistance and good bonding strength of the coating, solving the problem that existing coatings cannot meet the high balance of aluminum conductivity and corrosion resistance, and has important application prospects in metal aluminum cable shielding layers. Example

[0045] A method for preparing a conductive anti-corrosion coating having a brick-mud structure on an aluminum surface comprises the following steps:

[0046] Step 1, preparing a highly conductive ceramic filler with a lamellar structure;

[0047] 20% Ti3AlC2, 5% nickel chloride, 30% urea, and 45% silicon nitride grinding balls (5 mm in diameter) were placed in a ball mill and milled at 400 rpm for 36 h. The mixture was then dissolved in deionized water and dialyzed for 6 h using a 3500 molecular weight cutoff dialysis bag. The mixture was centrifuged twice at 3500 rpm for 30 min and dried in a vacuum at 30°C for 10 h to obtain a highly conductive ceramic filler with a lamellar structure.

[0048] Step 2, preparing a highly conductive ceramic coating;

[0049] The lamellar highly conductive ceramic filler, polyaniline, methyl methacrylate polymer, and methyl pyrrolidone prepared in step 1 were mixed in a mass ratio of 1:0.1:0.1:10, subjected to ultrasound and oscillation for 0.5 h, and then placed in a water bath at 30° C. for 5 h to obtain a highly conductive ceramic coating.

[0050] Step 3, negative charge treatment of the aluminum substrate surface;

[0051] The aluminum substrate was ultrasonically cleaned in acetone for 30 min, etched with 0.5 mol / L NaOH solution for 60 s, rinsed with deionized water, and immersed in 5% polystyrene sulfonate solution for 0.5 h to obtain a negatively charged aluminum substrate surface.

[0052] Step 4: Prepare a conductive anti-corrosion coating for brick and mud structures

[0053] The spin coating speed was controlled to be 1000 rpm, and the highly conductive ceramic coating prepared in step 2 was coated on the surface of the negatively charged aluminum substrate. After heat curing at 80°C for 10 h, a conductive anti-corrosion coating for a brick-mud structure was obtained. Example

[0054] A method for preparing a conductive anti-corrosion coating having a brick-mud structure on an aluminum surface comprises the following steps:

[0055] Step 1, preparing a highly conductive ceramic filler with a lamellar structure;

[0056] 20% TiCr2C2, 1% copper chloride, 34% urea, and 45% silicon nitride grinding balls (10 mm in diameter) were loaded into a ball mill and milled at 1000 rpm for 12 h. The mixture was then dissolved in deionized water and dialyzed for 12 h using a 4000 molecular weight cutoff dialysis bag. The mixture was centrifuged twice at 11000 rpm for 15 min and dried in a vacuum at 40°C for 8 h to obtain a highly conductive ceramic filler with a lamellar structure.

[0057] Step 2, preparing a highly conductive ceramic coating;

[0058] The lamellar highly conductive ceramic filler, polystyrene sulfonate, 2-ethylhexanoate polymer, and dimethylformamide in step 1 were mixed in a mass ratio of 3:0.5:0.5:8, subjected to ultrasound and oscillation for 1 h, and then placed in a water bath at 60°C for 1 h to obtain a highly conductive ceramic coating.

[0059] Step 3: Negative charge treatment on the aluminum substrate surface

[0060] The aluminum substrate was ultrasonically cleaned in ethanol for 30 min, etched with 2.5 mol / L NaOH solution for 10 s, rinsed with deionized water, and immersed in 8% polypropylene sulfonate solution for 0.5 h to obtain a negatively charged aluminum substrate surface.

[0061] Step 4: Prepare the conductive anti-corrosion coating for the brick-mud structure

[0062] The spin coating speed was controlled to be 2500 rpm, and the highly conductive ceramic coating prepared in step 2 was coated on the surface of the negatively charged aluminum substrate. After heat curing at 120°C for 1 h, a conductive anti-corrosion coating for a brick-mud structure was obtained. Example

[0063] Step 1, preparing a highly conductive ceramic filler having a lamellar structure;

[0064] 15% by mass of VC, 5% by mass of ferric chloride, 40% by mass of urea, and 40% by mass of silicon nitride grinding balls (8 mm in diameter) were placed in a ball mill and milled at 800 rpm for 24 h. The mixture was then dissolved in deionized water and dialyzed for 8 h using a 3800 molecular weight cutoff dialysis bag. The mixture was then centrifuged twice at 8000 rpm for 20 min and dried in a vacuum at 35°C for 10 h to obtain a highly conductive ceramic filler with a lamellar structure.

[0065] Step 2, preparing a highly conductive ceramic coating;

[0066] The lamellar highly conductive ceramic filler, polyacrylamide, perfluorooctyl vinyl ether polymer, and dimethyl sulfoxide prepared in step 1 were mixed in a mass ratio of 2:0.3:0.3:3, subjected to ultrasonication and oscillation for 0.8 h, and then placed in a water bath for 3 h at 40°C to obtain a highly conductive ceramic coating.

[0067] Step 3: Negative charge treatment on the aluminum substrate surface

[0068] The aluminum substrate was ultrasonically cleaned in ethanol for 30 min, etched with 2 mol / L NaOH solution for 30 s, rinsed with deionized water, and immersed in 10% polypropylene sulfonate solution for 1 h to obtain a negatively charged aluminum substrate surface.

[0069] Step 4: Prepare the conductive anti-corrosion coating for the brick-mud structure

[0070] The spin coating speed was controlled to be 1500 rpm, and the highly conductive ceramic coating prepared in step 2 was coated on the surface of the negatively charged aluminum substrate. After heat curing at 100°C for 3 h, a conductive anti-corrosion coating for a brick-mud structure was obtained. Example

[0071] A method for preparing a conductive anti-corrosion coating having a brick-mud structure on an aluminum surface comprises the following steps:

[0072] Step 1, preparing a highly conductive ceramic filler having a lamellar structure;

[0073] 18% by mass of MoAlB, 3% by mass of silver chloride, 37% by mass of urea, and 42% by mass of silicon nitride grinding balls (5 mm in diameter) were placed in a ball mill and milled at 600 rpm for 36 h. The mixture was then dissolved in deionized water and dialyzed for 10 h using a 4000 molecular weight cutoff dialysis bag. The mixture was then centrifuged twice at 600 rpm for 30 min and dried in a vacuum at 40°C for 5 h to obtain a highly conductive ceramic filler with a lamellar structure.

[0074] Step 2, preparing a highly conductive ceramic coating;

[0075] The lamellar highly conductive ceramic filler, polyaniline, methyl methacrylate polymer, and methyl pyrrolidone prepared in step 1 were mixed in a mass ratio of 2:0.2:0.3:5, subjected to ultrasonication and oscillation for 0.5 h, and then placed in a water bath at 60° C. for 3 h to obtain a highly conductive ceramic coating.

[0076] Step 3: Negative charge treatment on the aluminum substrate surface

[0077] The aluminum substrate was ultrasonically cleaned in acetone for 30 min, etched with 1 mol / L KOH solution for 20 s, rinsed with deionized water, and immersed in 6% polystyrene sulfonate solution for 2 h to obtain a negatively charged aluminum substrate surface.

[0078] Step 4: Prepare a conductive anti-corrosion coating for brick and mud structures

[0079] The spin coating speed was controlled to be 2000 rpm, and the highly conductive ceramic coating prepared in step 2 was coated on the surface of the negatively charged aluminum substrate. After heat curing at 70°C for 10 h, a conductive anti-corrosion coating for a brick-mud structure was obtained.

[0080] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing a conductive anti-corrosion coating with a brick-mud structure on an aluminum surface, characterized in that: The following steps are involved: Step 1, preparing a highly conductive ceramic filler having a lamellar structure; Ceramic powder, metal salt, urea and grinding balls are mixed in proportion and ball-milled, and then dissolved in deionized water, dialyzed, centrifuged and vacuum-dried to obtain a highly conductive ceramic filler with a lamellar structure; the amount of each material is as follows: 15%-20% ceramic powder, 1%-5% metal salt, 30%-40% urea and 40%-45% grinding balls, and the total amount of the above materials is 100%; the ceramic powder is any one of Ti3AlC2, TiCr2C2, V2C, and MoAlB, and the metal salt is any one of nickel chloride, copper chloride, ferric chloride, and silver chloride; Step 2, preparing a highly conductive ceramic coating; The highly conductive ceramic filler with a lamellar structure, a defoamer, and a leveling agent obtained in step 1 are added to a solvent, and subjected to ultrasonic, oscillation, and water bath treatment to obtain a highly conductive ceramic coating; Step 3, negative charge treatment of the aluminum substrate surface; The aluminum substrate is ultrasonically cleaned in an organic solvent, then etched with an alkaline solution, cleaned with deionized water, and immersed in a polyanionic conductive polymer solution to obtain an aluminum substrate with a negative charge; Step 4, preparing a conductive anti-corrosion coating for a brick-mud structure; The highly conductive ceramic coating obtained in step 2 is spin-coated on the negatively charged aluminum substrate obtained in step 3, and subjected to thermal curing treatment to obtain a brick-mud structure conductive anti-corrosion coating.

2. The method for preparing a conductive anti-corrosion coating with a brick-mud structure on an aluminum surface according to claim 1, characterized in that: The grinding balls in step 1 are silicon nitride with a diameter of 5-10 mm; the dialysis bag used in the dialysis has a molecular weight cutoff of 3500-4000, and the dialysis time is 6-12 h; the centrifugal speed is 3500-11000 rpm, and the centrifugation time is 15-30 min; the vacuum drying temperature is 30-40°C, and the time is 5-10 h.

3. The method for preparing a conductive anti-corrosion coating with a brick-mud structure on an aluminum surface according to claim 1, characterized in that: The ball milling time in step 1 is 12-36 h, and the ball milling speed is 400-1000 rpm.

4. The method for preparing a conductive anti-corrosion coating having a brick-mud structure on an aluminum surface according to claim 1, characterized in that: The mass ratio of the highly conductive ceramic filler, defoaming agent, leveling agent and solvent in step 2 is 1-3:0.1-0.5:0.1-0.5:3-5.

5. The method for preparing a conductive anti-corrosion coating having a brick-mud structure on an aluminum surface according to any one of claims 1 or 4, characterized in that: The defoaming agent in step 2 is any one of polyaniline, polystyrene sulfonate, and polyacrylamide; the leveling agent is any one of methyl methacrylate polymer, isopentyl 2-ethylhexanoate polymer, and perfluorooctyl vinyl ether polymer; and the solvent is any one of methyl pyrrolidone, dimethylformamide, and dimethyl sulfoxide.

6. The method for preparing a conductive anti-corrosion coating with a brick-mud structure on an aluminum surface according to claim 1, characterized in that: The ultrasonic and oscillation treatment time in step 2 is 0.5-1 h, and the water bath treatment temperature is 30-60° C. and the time is 1-5 h.

7. The method for preparing a conductive anti-corrosion coating having a brick-mud structure on an aluminum surface according to claim 1, characterized in that: The organic solvent in step 3 is any one of acetone and ethanol; the alkaline solution is any one of NaOH and KOH, with a concentration of 0.5-2.5 mol / L; the etching time is 10-60 s; the polyanionic conductive polymer solution is any one of polystyrene sulfonate, polypropylene sulfonate, and polystyrene sulfonate solution, and the mass proportion of the polyanionic conductive polymer solution is 5-10%; the immersion time is 0.5-2 h.

8. The method for preparing a conductive anti-corrosion coating with a brick-mud structure on an aluminum surface according to claim 1, characterized in that: The spin coating speed in step 4 is 1000-2500 rpm; the thermal curing temperature is 80-120° C., and the thermal curing time is 1-10 h.

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