Method for preparing an anti-fouling coating based on a composite antibacterial agent of ag2o modified with mg o

Abstract

The application discloses a preparation method of a fouling-resistant coating based on MgO modified AgO composite antibacterial agent, and specifically comprises the following steps: step 1, preparing MgO wet powder containing Ag + ; step 2, preparing AgCl\Mg(OH)2 composite material according to the product obtained in step 1; step 3, heating and heat-insulating the product obtained in step 2 in a muffle furnace to obtain AgCl\MgO composite material; step 4, preparing MgO modified AgO composite antibacterial agent according to the product obtained in step 3; and step 5, adding the product obtained in step 4 into E44 epoxy resin powder to prepare an epoxy resin-based corrosion-resistant and fouling-resistant coating. The MgO modified AgO composite antibacterial agent is introduced into the epoxy resin coating, and the MgO modified AgO composite antibacterial agent is low in price, has positive electricity in a weak acid and neutral environment, and has strong sterilization capacity, so that the problems that the epoxy resin coating cannot prevent biological fouling when preventing corrosion of marine equipment and that an organic antifouling agent is toxic to marine organisms are solved.

Description

Technical Field

[0001] This invention belongs to the field of anti-corrosion and anti-biofouling coating preparation technology, and relates to a method for preparing an antifouling coating based on MgO-modified AgO composite antibacterial agent. Background Technology

[0002] Corrosion and biofouling of marine equipment such as ships, submarines, and offshore platforms severely impact their lifespan. Existing anti-corrosion coatings effectively slow down corrosion but cannot prevent biofouling, leading to increased fuel consumption and further biofouling. To prevent biofouling, antifouling agents are added to these coatings; however, organic antifouling agents are highly toxic to marine organisms. Most inorganic antimicrobial agents, such as copper-based, zinc-based, silver-based, and titanium dioxide-based agents, are environmentally friendly, leading to significant research efforts focused on developing corrosion-resistant and biofouling-resistant coatings using inorganic antimicrobial agents as antifouling agents. Among inorganic antimicrobial agents, silver-based agents are widely used in antimicrobial coatings due to their strongest antibacterial activity, broad-spectrum antibacterial properties, long-lasting antibacterial effect, and non-toxicity.

[0003] The antibacterial ability of silver-based antibacterial agents is related to the valence state of silver ions; the higher the valence state, the stronger the bactericidal ability. This gives high-valence AgO nanomaterials a stronger bactericidal ability. However, AgO is expensive and negatively charged, making it difficult to quickly adsorb bacteria. MgO-modified AgO composite antibacterial agents are positively charged in weakly acidic and neutral environments, allowing for rapid adsorption of bacteria and other microorganisms while maintaining the strong bactericidal ability of AgO, and effectively reducing the cost of antibacterial agents. Therefore, it is feasible to use MgO-modified AgO composite antibacterial agents to achieve both antifouling function and environmentally friendly performance in environmentally friendly corrosion-resistant and antifouling coatings for marine equipment. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing an antifouling coating based on a MgO-modified AgO composite antibacterial agent. This method introduces a low-cost MgO-modified AgO composite antibacterial agent, which is positively charged in weakly acidic and neutral environments and has strong bactericidal ability, into an epoxy resin coating. This solves the problems that epoxy resin coatings cannot prevent biofouling when used for corrosion protection of marine equipment and that organic antifouling agents are toxic to marine organisms.

[0005] The technical solution adopted in this invention is a method for preparing an antifouling coating based on MgO-modified AgO composite antibacterial agent, which specifically includes the following steps:

[0006] Step 1: Add nano-MgO particles to a silver ammonia solution, stir and adsorb in a magnetic stirrer, then separate by vacuum filtration to obtain Ag-containing... + Wet MgO powder and supernatant were collected, and the concentration of silver ions in the supernatant was measured. The molar amount of silver ions adsorbed by MgO, n(Ag), was calculated. + 吸附 );

[0007] Step 2: Prepare AgCl\Mg(OH)2 composite material based on the product obtained in Step 1;

[0008] Step 3: Heat and hold the product obtained in Step 2 in a muffle furnace to obtain the AgCl\MgO composite material.

[0009] Step 4: Prepare MgO-modified AgO composite antibacterial agent based on the product obtained in Step 3;

[0010] Step 5: Add the product obtained in Step 4 to E44 epoxy resin powder to prepare an epoxy resin-based corrosion-resistant and anti-fouling coating.

[0011] The invention is further characterized by:

[0012] In step 1, the concentration of the silver ammonia solution is 0.1 mol / L to 0.185 mol / L.

[0013] The specific process of step 2 is as follows:

[0014] Step 1 separates the Ag-containing... + MgO wet powder was added to a solution containing n (Ag) molar mass. + 吸附 After the reaction was completed, the AgCl\Mg(OH)2 composite material was obtained by separating, washing and drying in NaCl solution.

[0015] The specific process of step 4 is as follows:

[0016] Prepare K2S2O8 solutions with concentrations of 0.03 mol / L to 0.04 mol / L and NaOH solutions with concentrations of 0.05 mol / L to 0.1 mol / L, respectively. Place the K2S2O8 solution in a constant temperature environment of 55℃ to 65℃, and add the AgCl / MgO composite material from step 3 under stirring. Then, add NaOH solution dropwise. After the addition is complete, react for 30 min to 75 min. After the reaction is complete, wash the separated gray-black powder, and finally dry it at 50℃ to 70℃ for 1.5 h to 3 h to obtain the MgO-modified AgO composite antibacterial agent.

[0017] The specific process of step 5 is as follows:

[0018] Step 5.1: Add 0.5% to 3% by mass of MgO-modified AgO composite antibacterial agent to E44 epoxy resin powder, and then ball mill it to achieve thorough mixing to obtain epoxy resin-based corrosion-resistant and antifouling coating.

[0019] Step 5.2: Apply the epoxy resin-based corrosion-resistant and anti-fouling coating obtained in step 5.1 onto Q235 steel using an electrostatic spraying machine to obtain an epoxy resin-based corrosion-resistant and anti-fouling coating, and then cure the coating to obtain the final product.

[0020] In step 5.2, the electrostatic spraying process parameters are as follows: electrostatic high voltage: 65kV~80kV; electrostatic current: 10μA~20μA; powder atomization pressure: 0.35MPa~0.45MPa; distance from electrostatic spraying machine to Q235 steel: 15cm~25cm.

[0021] The beneficial effects of this invention are as follows: This invention innovatively adds a low-cost, positively charged, environmentally friendly MgO-modified AgO composite antibacterial agent as a filler and antifouling agent, which can rapidly adsorb bacteria and algae. This agent is then combined with corrosion-resistant epoxy resin powder, optimizing the dispersion effect of the MgO-modified AgO composite antibacterial agent in the coating and the bonding strength between the coating and the metal substrate. This improves the coating's corrosion resistance while also providing antifouling properties, solving the problems of unsatisfactory antifouling effects and environmental toxicity of existing marine antifouling coatings, further expanding its application areas. Furthermore, this invention utilizes electrostatic spraying to prepare the corrosion-resistant and antifouling coating, which improves the bonding strength between the coating and the substrate, resulting in a uniform coating thickness. This method is convenient, simple, environmentally friendly, easy to scale up for production, highly efficient, and low-cost. Therefore, the epoxy resin-based corrosion-resistant and antifouling coating based on the MgO-modified AgO composite antibacterial agent has promising applications in the field of corrosion and biofouling prevention. Attached Figure Description

[0022] Figures 1(a) to (b) are surface SEM images of epoxy resin-based corrosion-resistant and anti-fouling coatings prepared by electrostatic spraying using MgO-modified AgO composite antibacterial agent as filler and antifouling agent in the antifouling coating preparation method of the present invention based on MgO-modified AgO composite antibacterial agent.

[0023] Figures 2(a) to (d) are the elemental surface energy distribution spectra of epoxy resin-based corrosion-resistant and antifouling coatings prepared by electrostatic spraying using MgO-modified AgO composite antibacterial agent as filler and antifouling agent in the antifouling coating preparation method of the present invention based on MgO-modified AgO composite antibacterial agent.

[0024] Figure 3 This is a potentiodynamic polarization curve of an epoxy resin-based corrosion-resistant and antifouling coating prepared by electrostatic spraying using MgO-modified AgO composite antibacterial agent as filler and antifouling agent in the antifouling coating preparation method of the present invention. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] This invention relates to a method for preparing an antifouling coating based on a MgO-modified AgO composite antibacterial agent. This method is a corrosion-resistant, biofouling-resistant, low-cost, and environmentally friendly epoxy resin-based corrosion-resistant and antifouling coating based on a MgO-modified AgO composite antibacterial agent, and is implemented according to the following steps:

[0027] Step 1: Add 1g of nano-MgO particles to 50mL of silver ammonia solution (silver ammonia solution concentration between 0.1 and 0.185 mol / L, temperature at room temperature), stir the mixture in a magnetic stirrer for 2 hours to allow the adsorption reaction to proceed, and then filter to obtain Ag-containing particles. + Wet MgO powder and supernatant were collected, and the concentration of silver ions in the supernatant was measured. The molar amount of silver ions adsorbed by MgO, n(Ag), was calculated. + 吸附 );

[0028] Step 2, the Ag-containing sample will be separated. + MgO wet powder was added to 50 mL of solution containing n (Ag) molar mass. + 吸附 The AgCl\Mg(OH)2 composite material was obtained by reacting the AgCl\Mg(OH)2 in NaCl solution for 30 min, separating, washing and drying at 70 ° C after the reaction.

[0029] Step 3: Heat the product obtained in Step 2 to 700°C in a muffle furnace and hold for 6-8 hours to obtain the AgCl\MgO composite material.

[0030] Step 4: Prepare 100 mL of K2S2O8 solution with a concentration of 0.03–0.04 mol / L and NaOH solution with a concentration of 0.05–0.1 mol / L respectively. Place the K2S2O8 solution in a constant temperature environment of 55–65℃, and add the AgCl / MgO composite material product from Step 3 under stirring. Then add NaOH solution dropwise. After the addition is complete, react for 30–75 min. After the reaction is complete, wash the separated gray-black powder and finally dry it at 50–70℃ for 1.5–3 h to obtain the MgO-modified AgO composite antibacterial agent.

[0031] Step 5: Add 0.5%–3% by mass of MgO-modified AgO composite antibacterial agent to E44 epoxy resin powder, and ball mill at 200 r / min for 2 hours at room temperature to ensure uniform mixing of the antifouling agent and epoxy resin powder. Then, use an electrostatic spraying machine to spray an epoxy resin-based corrosion-resistant and antifouling coating with a thickness of approximately 125 μm onto Q235 steel, and hold at 160℃ for 20 minutes to cure the coating. Specific electrostatic spraying process parameters: electrostatic high voltage: 65–80 kV; electrostatic current: 10–20 μA; powder atomization pressure: 0.35–0.45 MPa; distance from spray gun nozzle to workpiece: 15–25 cm.

[0032] Using the above preparation method, when the amount of MgO-modified AgO composite antibacterial agent added is 2.5 wt%, the lowest corrosion current density is 1.096 × 10⁻⁶. -9 A·cm -2 An epoxy resin-based corrosion-resistant and anti-fouling coating with a 99.7% sterilization rate against Staphylococcus aureus and a cross-cut adhesion rating of 0.

[0033] Example 1

[0034] This invention relates to a method for preparing an antifouling coating based on a MgO-modified AgO composite antibacterial agent, which specifically includes the following steps:

[0035] Step 1: 1g of nano-MgO particles were added to 50mL of 0.1mol / L silver ammonia solution at room temperature. The mixture was stirred in a magnetic stirrer for 2h to allow the adsorption reaction to proceed. After filtration, Ag-containing particles were obtained. + MgO and supernatant were collected, the concentration of silver ions in the supernatant was measured, and the molar amount of silver ions adsorbed by MgO, n(Ag), was calculated. + 吸附 );

[0036] Step 2, the Ag-containing sample will be separated. + MgO wet powder was added to 50 mL of solution containing n (Ag) molar mass. + 吸附 The AgCl\Mg(OH)2 composite material was obtained by reacting the AgCl\Mg(OH)2 in NaCl solution for 30 min, separating, washing and drying at 70 ° C after the reaction.

[0037] Step 3: Heat the product obtained in Step 2 to 700°C in a muffle furnace and hold for 6 hours to obtain the AgCl\MgO composite material.

[0038] Step 4: Prepare 100 mL of 0.03 mol / L K2S2O8 solution and 0.05 mol / L NaOH solution respectively. Place the K2S2O8 solution in a constant temperature environment of 55℃, add the product from step 3 under stirring, and then add NaOH solution dropwise. After the addition is complete, react for 30 min. After the reaction is complete, wash the separated gray-black powder and finally dry it at 50℃ for 3 h to obtain the MgO modified AgO composite antibacterial agent.

[0039] Step 5: Add 0.5% by mass of MgO-modified AgO composite antibacterial agent to E44 epoxy resin powder, and ball mill at 200 r / min for 2 hours at room temperature to ensure uniform mixing of the antifouling agent and epoxy resin powder. Then, use an electrostatic spraying machine to spray an epoxy resin-based corrosion-resistant and antifouling coating with a thickness of approximately 125 μm onto Q235 steel, and hold at 160℃ for 20 minutes to cure the coating. Specific electrostatic spraying process parameters: electrostatic high voltage: 65kV; electrostatic current: 10μA; powder atomization pressure: 0.35MPa; distance from spray gun nozzle to workpiece: 15cm.

[0040] Example 2

[0041] This invention relates to a method for preparing an antifouling coating based on a MgO-modified AgO composite antibacterial agent, which specifically includes the following steps:

[0042] Step 1: 1g of nano-MgO particles were added to 50mL of 0.165mol / L silver ammonia solution at room temperature. The mixture was stirred in a magnetic stirrer for 2h to allow the adsorption reaction to proceed. Afterward, the Ag-containing particles were separated by filtration. + MgO and supernatant were collected, the concentration of silver ions in the supernatant was measured, and the molar amount of silver ions adsorbed by MgO, n(Ag), was calculated. + 吸附 );

[0043] Step 2, the Ag-containing sample will be separated. + MgO wet powder was added to 50 mL of solution containing n (Ag) molar mass. + 吸附 The AgCl\Mg(OH)2 composite material was obtained by reacting the AgCl\Mg(OH)2 in NaCl solution for 30 min, separating, washing and drying at 70 ° C after the reaction.

[0044] Step 3: Heat the product obtained in Step 2 to 700°C in a muffle furnace and hold for 7 hours to obtain the AgCl\MgO composite material.

[0045] Step 4: Prepare 100 mL of 0.035 mol / L K2S2O8 solution and 0.075 mol / L NaOH solution respectively. Place the K2S2O8 solution in a constant temperature environment of 60℃, add the product from step 3 under stirring, and then add NaOH solution dropwise. After the addition is complete, react for 45 min. After the reaction is complete, wash the separated gray-black powder and finally dry it at 60℃ for 2 h to obtain the MgO modified AgO composite antibacterial agent.

[0046] Step 5: Add 1.0% by mass of MgO-modified AgO composite antibacterial agent to E44 epoxy resin powder, and ball mill at 200 r / min for 2 hours at room temperature to ensure uniform mixing of the antifouling agent and epoxy resin powder. Then, use an electrostatic spraying machine to spray an epoxy resin-based corrosion-resistant and antifouling coating with a thickness of approximately 125 μm onto Q235 steel, and keep it at 160℃ for 20 minutes to cure the coating. Specific electrostatic spraying process parameters: electrostatic high voltage: 70kV; electrostatic current: 15μA; powder atomization pressure: 0.4MPa; distance from spray gun nozzle to workpiece: 20cm.

[0047] Example 3

[0048] This invention relates to a method for preparing an antifouling coating based on a MgO-modified AgO composite antibacterial agent, which specifically includes the following steps:

[0049] Step 1: 1g of nano-MgO particles were added to 50mL of 0.185mol / L silver ammonia solution at room temperature. The mixture was stirred in a magnetic stirrer for 2h to allow the adsorption reaction to proceed. After filtration, Ag-containing particles were obtained. + MgO and supernatant were collected, the concentration of silver ions in the supernatant was measured, and the molar amount of silver ions adsorbed by MgO, n(Ag), was calculated. + 吸附 );

[0050] Step 2, the Ag-containing sample will be separated. + MgO wet powder was added to 50 mL of solution containing n (Ag) molar mass. + 吸附 The AgCl\Mg(OH)2 composite material was obtained by reacting the AgCl\Mg(OH)2 in NaCl solution for 30 min, separating, washing and drying at 70 ° C after the reaction.

[0051] Step 3: Heat the product obtained in Step 2 to 700°C in a muffle furnace and hold for 8 hours to obtain the AgCl\MgO composite material.

[0052] Step 4: Prepare 100 mL of 0.04 mol / L K2S2O8 solution and 0.1 mol / L NaOH solution respectively. Place the K2S2O8 solution in a constant temperature environment of 65℃, add the product from step 3 under stirring, and then add NaOH solution dropwise. After the addition is complete, react for 75 min. After the reaction is complete, wash the separated gray-black powder and finally dry it at 70℃ for 1.5 h to obtain the MgO modified AgO composite antibacterial agent.

[0053] Step 5: Add 2% by mass of MgO-modified AgO composite antibacterial agent to E44 epoxy resin powder, and ball mill at 200 r / min for 2 hours at room temperature to ensure uniform mixing of the antifouling agent and epoxy resin powder. Then, use an electrostatic spraying machine to spray an epoxy resin-based corrosion-resistant and antifouling coating with a thickness of approximately 125 μm onto Q235 steel, and keep it at 160℃ for 20 minutes to cure the coating. Specific electrostatic spraying process parameters: electrostatic high voltage: 80kV; electrostatic current: 20μA; powder atomization pressure: 0.45MPa; distance from spray gun nozzle to workpiece: 25cm.

[0054] Figures 1(a) and (b) are SEM images of the epoxy resin-based corrosion-resistant and anti-fouling coating prepared in Example 3 of the present invention at 500x magnification (Figure 1(a)) and 2000x magnification (Figure 1(b)), respectively. As shown in Figure 1(a), a large number of bright small particles with a diameter of less than 1 μm are uniformly distributed on the coating surface, with a very small portion of the bright particles exhibiting an agglomerate state. This indicates that the MgO-modified AgO composite antibacterial agent is uniformly distributed on the coating through ball milling and electrostatic spraying. As shown in Figure 1(b), a small number of pores and a small number of large agglomerated particles exist on the coating surface.

[0055] Figures 2(a) to 2(d) This is the elemental surface distribution energy spectrum of the epoxy resin-based corrosion-resistant and anti-fouling coating prepared in Example 3 of the method of the present invention (Figure 2(a) C elemental surface distribution energy spectrum);

[0056] Figure 2(b) Energy spectrum of O element surface distribution; Figure 2(c) Energy spectrum of Mg element surface distribution;

[0057] Figure 2(d) Energy spectrum of Ag element surface distribution. As can be seen from Figures 2(a) and (b), C and O elements are abundantly distributed throughout the coating surface, indicating that the main component of the coating is epoxy resin; as can be seen from Figures 2(c) and (d), Mg and Ag elements are uniformly dispersed in the coating in the form of dots, indicating that the MgO modified AgO composite antibacterial agent is uniformly dispersed in the coating as a filler.

[0058] Figure 3 This is a potentiodynamic polarization curve of the epoxy resin-based corrosion-resistant coating prepared by adding 0.5%, 1.5%, and 2.0% of the MgO-modified AgO composite antibacterial agent in the method of this invention. Figure 3 It is evident that, compared to pure epoxy coatings, the addition of MgO-modified AgO composite antibacterial agent results in a positive shift in the self-corrosion potential and a decrease in the corrosion current density of epoxy resin-based corrosion-resistant and antifouling coatings. This indicates that the introduction of MgO-modified AgO composite antibacterial agent improves the corrosion resistance of epoxy resin coatings.

[0059] Table 1 shows the Tafel fitting parameters of the potentiodynamic polarization curves of epoxy resin-based corrosion-resistant and antifouling coatings prepared by adding 0.5%, 1.5%, and 2.0% of MgO-modified AgO composite antibacterial agent in the method of this invention, as well as the killing rate against Staphylococcus aureus.

[0060] Table 1

[0061]

[0062] The present invention provides a method for preparing an antifouling coating based on a MgO-modified AgO composite antibacterial agent. The method uses the MgO-modified AgO composite antibacterial agent as both filler and antifouling agent. The composite antibacterial agent is ball-milled and mixed with epoxy resin powder, and then an epoxy resin-based corrosion-resistant and antifouling coating is prepared on the surface of Q235 steel using electrostatic spraying. Compared to AgO / epoxy resin composite coatings prepared using AgO nanopowder as filler and antifouling agent, the epoxy resin-based composite coating prepared by this method shows only a slight reduction in the bactericidal rate against Staphylococcus aureus, but its self-corrosion current density is reduced by nearly three orders of magnitude, resulting in stronger corrosion resistance. Furthermore, the cost is significantly lower than that of AgO additives. Compared to pure epoxy resin coatings, the epoxy resin-based corrosion-resistant and anti-fouling coating prepared by this method exhibits higher corrosion resistance. Furthermore, when the mass addition of the MgO-modified AgO composite antibacterial agent is 2.5%, the kill rate against Staphylococcus aureus reaches 99.7%, demonstrating excellent antibacterial properties. This inhibits the attachment and reproduction of marine organisms, solving the problems of marine biofouling and corrosion. Therefore, the epoxy resin-based corrosion-resistant and antifouling coating based on the MgO-modified AgO composite antibacterial agent prepared by this method significantly improves the coating's corrosion resistance while maintaining the bactericidal activity of AgO and reducing raw material and preparation costs, which is beneficial for market application and has broad application prospects in the field of corrosion protection and biofouling prevention for marine equipment.

[0063] This invention utilizes a low-cost, high-bacterial-activity MgO-modified AgO composite antibacterial agent as the antifouling agent and epoxy powder as the anticorrosive coating. An epoxy resin-based corrosion-resistant and antifouling coating with high bonding strength, excellent bactericidal effect, low cost, and environmental friendliness is prepared using electrostatic spraying. This solves the problems of weak antibacterial ability and environmental unfriendliness of existing antifouling coatings. The developed epoxy resin-based corrosion-resistant and antifouling coating, which combines corrosion resistance and antibacterial functions, is low-cost and environmentally friendly, and can provide highly efficient protection for marine equipment used in harsh marine environments, generating significant social and economic benefits.

Claims

1. A method for preparing an antifouling coating based on MgO-modified AgO composite antibacterial agent, characterized in that: Specifically, the steps include the following: Step 1: Add nano-MgO particles to a silver ammonia solution, stir and adsorb in a magnetic stirrer, then separate by vacuum filtration to obtain Ag-containing... + Wet MgO powder and supernatant were collected, and the concentration of silver ions in the supernatant was measured. The molar amount of silver ions adsorbed by MgO, n(Ag), was calculated. + 吸附 In step 1, the concentration of the silver ammonia solution is 0.1 mol / L to 0.185 mol / L. Step 2: Prepare AgCl\Mg(OH)2 composite material based on the product obtained in Step 1; The specific process of step 2 is as follows: Step 1 separates the Ag-containing... + MgO wet powder was added to a solution containing n (Ag) molar mass. + 吸附 After the reaction was completed, the AgCl\Mg(OH)2 composite material was obtained by separating, washing and drying in NaCl solution. Step 3: Heat and hold the product obtained in Step 2 in a muffle furnace to obtain the AgCl\MgO composite material. Step 4: Prepare MgO-modified AgO composite antibacterial agent based on the product obtained in Step 3; The specific process of step 4 is as follows: K2S2O8 solution with a concentration of 0.03mol / L to 0.04mol / L and NaOH solution with a concentration of 0.05mol / L to 0.1mol / L were prepared respectively. The K2S2O8 solution was placed in a constant temperature environment of 55℃ to 65℃. The AgCl / MgO composite material product from step 3 was added under stirring. Then, NaOH solution was added dropwise. After the addition was complete, the reaction was carried out for 30 min to 75 min. After the reaction was completed, the gray-black powder obtained was washed and finally dried at 50℃ to 70℃ for 1.5 h to 3 h to obtain MgO modified AgO composite antibacterial agent. Step 5: Add the product obtained in Step 4 to E44 epoxy resin powder to prepare an epoxy resin-based corrosion-resistant and anti-fouling coating; the specific process of Step 5 is as follows: Step 5.1: Add 0.5%~3% by mass of MgO-modified AgO composite antibacterial agent to E44 epoxy resin powder, and then ball mill it to achieve full mixing to obtain epoxy resin-based corrosion-resistant and anti-fouling coating. Step 5.2: Apply the epoxy resin-based corrosion-resistant and anti-fouling coating obtained in Step 5.1 onto Q235 steel using an electrostatic spraying machine to obtain an epoxy resin-based corrosion-resistant and anti-fouling coating, and then cure the coating to obtain the final product. In Step 5.2, the electrostatic spraying process parameters are: electrostatic high voltage: 65 kV~80kV; electrostatic current: 10µA~20µA; powder atomization pressure: 0.35 MPa~0.45MPa; distance from the electrostatic spraying machine to the Q235 steel: 15 cm~25 cm.

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