Hinge composite coating with high corrosion resistance and wear resistance and preparation method thereof

Abstract

The invention discloses a hinge composite coating with high corrosion resistance and wear resistance and a preparation method of the hinge composite coating. The coating is composed of a wear-resistant resin matrix, a modified ceramic wear-resistant filler, a preservative, a dispersant and a function enhancing modifier. The preparation method comprises the following steps: preparing the preservative through cyclization reaction of C18 fatty acid and diethylenetriamine, phosphoric acid esterification and ammonium molybdate complexation; then, gamma-methacryloxy propyl trimethoxy silane and zirconium nitrate are used as precursors to synthesize a function enhancement modifier; and finally, all the components are evenly mixed and then sprayed to the pretreated metal surface, and the composite coating is formed through step curing. The coating reaches the 10-level protection level in a salt spray test, the Taber abrasion mass loss is lower than 18.5 mg, the adhesive force is 0 level, and the problems that a traditional coating is poor in component compatibility, single in protection function and insufficient in durability due to physical blending are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of surface engineering and functional coating technology, and particularly relates to a hinge composite coating with high corrosion resistance and wear resistance and a preparation method thereof. BACKGROUND

[0002] As an indispensable connecting and rotating part in various doors and windows, cabinet bodies and mechanical equipment, the metal substrate (such as stainless steel, aluminum alloy, titanium alloy) of the hinge is long-term served in complex working conditions, and bears frequent opening and closing friction, mechanical stress and environmental medium (such as humid air, salt spray, industrial pollutants) erosion. The coupling effect of friction and wear and electrochemical corrosion is the main reason for the performance degradation, jamming, abnormal sound and even failure of the hinge. At present, the mainstream technical means to improve the durability of the hinge is to apply a functional coating on the surface thereof. Traditional coating technology often focuses on the optimization of a single performance: for example, a coating with high hardness and wear resistance can be obtained by electroplating hard chromium or physical vapor deposition of titanium nitride, but its corrosion resistance, especially its scratch corrosion resistance, is limited, and the process is environmentally friendly. Pressure is great; and although the use of zinc-rich primer or passivation treatment can provide good corrosion protection, the surface hardness is low and not wear-resistant, which cannot meet the long-term friction requirements of the hinge moving parts. Although there have been attempts to physically blend wear-resistant fillers (such as ceramic particles) and corrosion-resistant pigments (such as phosphate and chromate) to prepare composite coatings, this method has inherent defects such as poor component compatibility, weak interface bonding and insufficient functional synergy. In particular, at the micro level, simple physical mixing cannot achieve intelligent and controllable release and long-term maintenance of corrosion-resistant components, and corrosion will quickly occur and expand at the defect once the coating is worn and cracked, eventually leading to failure of the protection. SUMMARY

[0003] In view of the above problems, the present application provides a hinge composite coating with high corrosion resistance and wear resistance and a preparation method thereof, which solves the technical problem that the existing hinge surface coating cannot simultaneously maintain long-term corrosion resistance under severe friction and wear conditions.

[0004] The present application can be implemented by the following technical solutions: A preparation method of a hinge composite coating with high corrosion resistance and wear resistance, comprising the following steps: Step 1, immerse the metal hinge substrate in an alkaline degreasing liquid at 55-65℃, and treat it in an ultrasonic cleaning machine for 10-15min; ultrasonic rinse with deionized water, immerse in an acid pickling liquid for 5-10min; then ultrasonic clean with deionized water; finally, dry in a 105-110℃ air drying oven for 25-35min to obtain a clean and activated hinge substrate surface; Step 2: Mix the wear-resistant resin matrix, wear-resistant filler, corrosion inhibitor, BYK-2150 dispersant and functional enhancement modifier, stir, and form a composite coating. Step 3: Spray the composite coating onto the hinge substrate surface to form a wet film. Then, cure the wet film to ensure that the composite coating is firmly bonded to the hinge substrate, resulting in a hinge composite coating with high corrosion resistance and wear resistance.

[0005] Preferably, the metal hinge substrate in step 1 is stainless steel, aluminum alloy, or titanium alloy.

[0006] Preferably, the wear-resistant resin matrix in step 2 is epoxy resin, polyurethane resin, or acrylic resin.

[0007] Preferably, the wear-resistant filler in step 2 is modified alumina, modified silicon carbide, or boron nitride.

[0008] Preferably, the preservative in step 2 is prepared as follows: C18 fatty acid and diethylenetriamine in a molar ratio of 1:(0.9-1.2) are added to a flask, and a dehydration cyclization reaction is carried out at 120-160℃ for 2-4 hours to obtain an imidazoline intermediate. The mixture is cooled to 50-70℃, and phosphoric acid is added. A phosphoric acid esterification reaction is carried out at 60-90℃ for 1-3 hours to obtain a phosphate-functionalized imidazoline compound. The phosphate-functionalized imidazoline compound is then dissolved in anhydrous ethanol, and an aqueous solution of ammonium molybdate is added. A complexation reaction is carried out at 30-60℃ for 0.5-2 hours. After the reaction is completed, the pH of the system is adjusted to 6.0-7.0 to obtain the preservative.

[0009] Preferably, in step 2, the mass ratio of wear-resistant resin matrix, wear-resistant filler, preservative, dispersant, and functional enhancement modifier is (50-65):(20-30):(8-15):(0.5-2):(2-5).

[0010] Preferably, the preparation method of the functionally enhanced modified material is as follows: In a nitrogen atmosphere, γ-methacryloxypropyltrimethoxysilane, 2-aminobenzimidazole, and p-toluenesulfonic acid catalyst are dissolved in a mixed solvent of ethanol and toluene and subjected to reflux reaction. The organic precursor is obtained by vacuum distillation. The organic precursor is dissolved in ethanol, and an ethanol solution of zirconium nitrate is added dropwise under stirring. The reaction is carried out at 60-70℃ for 2-4 hours to obtain an organometallic complex intermediate. Deionized water is added and the pH is adjusted to 8-9. The mixture is hydrolyzed and polycondensed at 50-60℃ for 12-24 hours. The reaction product is washed and dried to obtain the functionally enhanced modified material.

[0011] Preferably, the ratio of γ-methacryloxypropyltrimethoxysilane, 2-aminobenzimidazole, and p-toluenesulfonic acid catalyst is 1 mol: (0.8-1.2) mol: (5-20) mmol.

[0012] Preferably, the reflux reaction is carried out at a temperature of 80-90°C for 4-8 hours.

[0013] Preferably, the curing process in step 3 is as follows: drying at room temperature for 10-15 minutes, baking at 80-100℃ for 30-60 minutes, raising the temperature to 160-180℃, and holding at that temperature for 60-120 minutes.

[0014] The beneficial effects of this invention are: This invention, through the structural design of the corrosion inhibitor and the construction of functional enhancement modifiers, chemically bonds and disperses the anti-corrosion active components and wear-resistant reinforcing phases at the molecular and nanoscale, significantly improving the coating density and interfacial adhesion. The self-made phosphate-functionalized imidazoline-ammonium molybdate complex, used as a corrosion inhibitor, intelligently releases molybdate ions at coating damage sites, forming a dense passivation film in situ, significantly delaying the penetration of corrosive media into the substrate and blocking the corrosion propagation path at its source. The organic-inorganic hybrid network constructed by the modifiers serves as a reinforcing framework; its silane coupling structure forms strong chemical bonds with the matrix and resin, improving coating adhesion and cohesive strength. Simultaneously, the zirconium-based inorganic phase significantly enhances the coating's hardness and wear resistance. The corrosion inhibitor and functional enhancement modifier work synergistically; the former achieves corrosion self-inhibition and long-term protection, while the latter enhances the coating's wear resistance and crack resistance. The hinge composite coating prepared by this invention achieves a protection level of 10 in the salt spray test, with a Taber wear mass loss of less than 18.5 mg and an adhesion level of 0, exhibiting both excellent corrosion resistance and wear resistance. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This refers to the quality loss due to Taber wear. Detailed Implementation

[0017] The following provides a detailed description of the embodiments of the present invention: These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and processes. However, the scope of protection of the present invention is not limited to the following embodiments. Experimental methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions.

[0018] Example 1 A method for preparing a hinge composite coating with high corrosion resistance and wear resistance includes the following steps: Step 1: Immerse the stainless steel in an alkaline degreasing solution at 55°C and treat it in an ultrasonic cleaner for 15 minutes; ultrasonically rinse it with deionized water and immerse it in an acid pickling solution (HNO3 15% v / v, HF 2% v / v) for 5 minutes; then ultrasonically clean it with deionized water; finally, dry it in a 105°C forced-air drying oven for 35 minutes to obtain a clean and activated hinge substrate surface. Step 2: Add 1 mol of C18 fatty acid and 0.9 mol of diethylenetriamine to a flask, and carry out a dehydration and cyclization reaction at 120°C for 4 hours to obtain an imidazoline intermediate. Cool to 50°C, add 2 mmol of orthophosphoric acid, and carry out a phosphorylation reaction at 60°C for 3 hours to obtain a phosphate-functionalized imidazoline compound. Then dissolve the phosphate-functionalized imidazoline compound in anhydrous ethanol, add 100 mL of an aqueous solution of ammonium molybdate, and carry out a complexation reaction at 30°C for 2 hours. After the reaction is completed, adjust the pH of the system to 6.0 to obtain the preservative. Step 3: Under a nitrogen atmosphere, 1 mol of γ-methacryloxypropyltrimethoxysilane, 0.8 mol of 2-aminobenzimidazole, and 5 mmol of p-toluenesulfonic acid catalyst were dissolved in a mixed solvent of ethanol and toluene and refluxed at 80 °C for 8 h. The organic precursor was obtained by vacuum distillation. The organic precursor was dissolved in ethanol, and 50 mL of zirconium nitrate ethanol solution was added dropwise with stirring. The reaction was carried out at 60 °C for 4 h to obtain an organometallic complex intermediate. Deionized water was added and the pH was adjusted to 8. The reaction was carried out at 50 °C for 24 h for hydrolysis and polycondensation. The reaction product was washed and dried to obtain the functionally enhanced modified product. Step 4: Mix 500g epoxy resin, 200g modified alumina, 80g preservative, 5g BYK-2150 dispersant and 20g functional enhancement modifier, stir to form a composite coating. Step 5: Spray the composite coating onto the hinge substrate surface to form a wet film. Dry the wet film at room temperature for 10 minutes, bake at 80°C for 60 minutes, raise the temperature to 160°C, and hold for 120 minutes to ensure that the composite coating is firmly bonded to the hinge substrate, thereby obtaining a hinge composite coating with high anti-corrosion and wear-resistant properties.

[0019] Example 2 A method for preparing a hinge composite coating with high corrosion resistance and wear resistance includes the following steps: Step 1: Immerse the aluminum alloy in an alkaline degreasing solution at 60℃ and treat it in an ultrasonic cleaner for 12 minutes; ultrasonically rinse it with deionized water, then immerse it in an acid pickling solution (HNO3 15% v / v, HF 2% v / v) for 8 minutes; then ultrasonically clean it with deionized water; finally, dry it in a 110℃ forced-air drying oven for 25 minutes to obtain a clean and activated hinge substrate surface. Step 2: Add 1 mol of C18 fatty acid and 1.2 mol of diethylenetriamine to a flask and carry out a dehydration and cyclization reaction at 140°C for 3 hours to obtain an imidazoline intermediate. Cool to 60°C, add 4 mmol of orthophosphoric acid, and carry out a phosphorylation reaction at 75°C for 2 hours to obtain a phosphate-functionalized imidazoline compound. Then dissolve the phosphate-functionalized imidazoline compound in anhydrous ethanol, add 100 mL of an aqueous solution of ammonium molybdate, and carry out a complexation reaction at 45°C for 1.25 hours. After the reaction is completed, adjust the pH of the system to 6.5 to obtain the preservative. Step 3: Under a nitrogen atmosphere, 1 mol of γ-methacryloxypropyltrimethoxysilane, 1.0 mol of 2-aminobenzimidazole, and 12.5 mmol of p-toluenesulfonic acid catalyst were dissolved in a mixed solvent of ethanol and toluene and refluxed at 85 °C for 6 h. The organic precursor was obtained by vacuum distillation. The organic precursor was dissolved in ethanol, and 50 mL of zirconium nitrate ethanol solution was added dropwise with stirring. The reaction was carried out at 65 °C for 3 h to obtain an organometallic complex intermediate. Deionized water was added and the pH was adjusted to 9. The reaction was carried out at 55 °C for 18 h for hydrolysis and polycondensation. The reaction product was washed and dried to obtain the functionally enhanced modified product. Step 4: Mix 600g of polyurethane resin, 250g of modified silicon carbide, 115g of preservative, 12.5g of BYK-2150 dispersant and 35g of functional enhancement modifier, stir to form a composite coating. Step 5: Spray the composite coating onto the hinge substrate surface to form a wet film. Dry the wet film at room temperature for 12 minutes, bake at 90°C for 45 minutes, raise the temperature to 170°C, and hold for 90 minutes to ensure that the composite coating is firmly bonded to the hinge substrate, thereby obtaining a hinge composite coating with high anti-corrosion and wear-resistant properties.

[0020] Example 3 A method for preparing a hinge composite coating with high corrosion resistance and wear resistance includes the following steps: Step 1: Immerse the titanium alloy in an alkaline degreasing solution at 65°C and treat it in an ultrasonic cleaner for 10 minutes; ultrasonically rinse it with deionized water and immerse it in an acid pickling solution (HNO3 15% v / v, HF 2% v / v) for 10 minutes; then ultrasonically clean it with deionized water; finally, dry it in a 110°C forced-air drying oven for 30 minutes to obtain a clean and activated hinge substrate surface. Step 2: Add 1 mol of C18 fatty acid and 1.2 mol of diethylenetriamine to a flask and carry out a dehydration and cyclization reaction at 160°C for 2 hours to obtain an imidazoline intermediate. Cool to 70°C, add 6 mmol of orthophosphoric acid, and carry out a phosphorylation reaction at 90°C for 1 hour to obtain a phosphate-functionalized imidazoline compound. Then dissolve the phosphate-functionalized imidazoline compound in anhydrous ethanol, add 100 mL of an aqueous solution of ammonium molybdate, and carry out a complexation reaction at 60°C for 0.5 hours. After the reaction is completed, adjust the pH of the system to 7.0 to obtain the preservative. Step 3: Under a nitrogen atmosphere, 1 mol of γ-methacryloxypropyltrimethoxysilane, 1.2 mol of 2-aminobenzimidazole, and 20 mmol of p-toluenesulfonic acid catalyst were dissolved in a mixed solvent of ethanol and toluene, and the mixture was refluxed at 90 °C for 4 h. The organic precursor was obtained by vacuum distillation. The organic precursor was dissolved in ethanol, and 50 mL of zirconium nitrate ethanol solution was added dropwise with stirring. The mixture was reacted at 70 °C for 2 h to obtain an organometallic complex intermediate. Deionized water was added and the pH was adjusted to 9. The mixture was hydrolyzed and polycondensed at 60 °C for 12 h. The reaction product was washed and dried to obtain the functionally enhanced modified product. Step 4: Mix 650g acrylic resin, 300g boron nitride, 150g preservative, 20g BYK-2150 dispersant and 50g functional enhancement modifier, stir to form a composite coating. Step 5: Spray the composite coating onto the hinge substrate surface to form a wet film. Dry the wet film at room temperature for 15 minutes, bake at 100°C for 30 minutes, raise the temperature to 180°C, and hold for 60 minutes to ensure that the composite coating is firmly bonded to the hinge substrate, thereby obtaining a hinge composite coating with high anti-corrosion and wear-resistant properties.

[0021] Example 4 A method for preparing a hinge composite coating with high corrosion resistance and wear resistance includes the following steps: Step 1: Immerse the aluminum alloy in an alkaline degreasing solution at 55°C and treat it in an ultrasonic cleaner for 15 minutes; ultrasonically rinse it with deionized water, then immerse it in an acid pickling solution (HNO3 15% v / v, HF 2% v / v) for 10 minutes; subsequently ultrasonically clean it with deionized water; finally, dry it in a 105°C forced-air drying oven for 25 minutes to obtain a clean and activated hinge substrate surface. Step 2: Add 1 mol of C18 fatty acid and 0.9 mol of diethylenetriamine to a flask, and carry out a dehydration and cyclization reaction at 160°C for 2 hours to obtain an imidazoline intermediate. Cool to 70°C, add 2 mmol of orthophosphoric acid, and carry out a phosphorylation reaction at 60°C for 1 hour to obtain a phosphate-functionalized imidazoline compound. Then dissolve the phosphate-functionalized imidazoline compound in anhydrous ethanol, add 100 mL of an aqueous solution of ammonium molybdate, and carry out a complexation reaction at 30°C for 2 hours. After the reaction is completed, adjust the pH of the system to 7.0 to obtain the preservative. Step 3: Under a nitrogen atmosphere, 1 mol of γ-methacryloxypropyltrimethoxysilane, 1.2 mol of 2-aminobenzimidazole, and 5 mmol of p-toluenesulfonic acid catalyst were dissolved in a mixed solvent of ethanol and toluene and refluxed at 80 °C for 8 h. The organic precursor was obtained by vacuum distillation. The organic precursor was dissolved in ethanol, and 50 mL of zirconium nitrate ethanol solution was added dropwise with stirring. The reaction was carried out at 70 °C for 4 h to obtain an organometallic complex intermediate. Deionized water was added and the pH was adjusted to 8. The reaction was carried out at 60 °C for 12 h for hydrolysis and polycondensation. The reaction product was washed and dried to obtain the functionally enhanced modified product. Step 4: Mix 500g epoxy resin, 300g modified silicon carbide, 80g preservative, 20g BYK-2150 dispersant and 50g functional enhancement modifier, stir to form a composite coating. Step 5: Spray the composite coating onto the hinge substrate surface to form a wet film. Dry the wet film at room temperature for 10 minutes, bake at 100°C for 60 minutes, raise the temperature to 180°C, and hold for 120 minutes to ensure that the composite coating is firmly bonded to the hinge substrate, thereby obtaining a hinge composite coating with high anti-corrosion and wear-resistant properties.

[0022] Comparative Example 1: The difference between this comparative example and Example 1 is that no functional enhancement modifier is added.

[0023] A method for preparing a hinge composite coating includes the following steps: Step 1: Immerse the stainless steel in an alkaline degreasing solution at 55°C and treat it in an ultrasonic cleaner for 15 minutes; ultrasonically rinse it with deionized water and immerse it in an acid pickling solution (HNO3 15% v / v, HF 2% v / v) for 5 minutes; then ultrasonically clean it with deionized water; finally, dry it in a 105°C forced-air drying oven for 35 minutes to obtain a clean and activated hinge substrate surface. Step 2: Add 1 mol of C18 fatty acid and 0.9 mol of diethylenetriamine to a flask, and carry out a dehydration and cyclization reaction at 120°C for 4 hours to obtain an imidazoline intermediate. Cool to 50°C, add 2 mmol of orthophosphoric acid, and carry out a phosphorylation reaction at 60°C for 3 hours to obtain a phosphate-functionalized imidazoline compound. Then dissolve the phosphate-functionalized imidazoline compound in anhydrous ethanol, add 100 mL of an aqueous solution of ammonium molybdate, and carry out a complexation reaction at 30°C for 2 hours. After the reaction is completed, adjust the pH of the system to 6.0 to obtain the preservative. Step 3: Mix 500g epoxy resin, 200g modified alumina, 80g preservative, and 5g BYK-2150 dispersant, stir, and form a composite coating. Step 4: Spray the composite coating onto the hinge substrate surface to form a wet film. Dry the wet film at room temperature for 10 minutes, bake at 80°C for 60 minutes, raise the temperature to 160°C, and hold for 120 minutes to ensure that the composite coating is firmly bonded to the hinge substrate, thus obtaining the hinge composite coating.

[0024] Comparative Example 2: The difference between this comparative example and Example 1 is that zinc phosphate preservative is used instead of the self-made preservative of this invention.

[0025] A method for preparing a hinge composite coating with high corrosion resistance and wear resistance includes the following steps: Step 1: Immerse the stainless steel in an alkaline degreasing solution at 55°C and treat it in an ultrasonic cleaner for 15 minutes; ultrasonically rinse it with deionized water and immerse it in an acid pickling solution (HNO3 15% v / v, HF 2% v / v) for 5 minutes; then ultrasonically clean it with deionized water; finally, dry it in a 105°C forced-air drying oven for 35 minutes to obtain a clean and activated hinge substrate surface. Step 2: Under a nitrogen atmosphere, 1 mol of γ-methacryloxypropyltrimethoxysilane, 0.8 mol of 2-aminobenzimidazole, and 5 mmol of p-toluenesulfonic acid catalyst were dissolved in a mixed solvent of ethanol and toluene and refluxed at 80 °C for 8 h. The organic precursor was obtained by vacuum distillation. The organic precursor was dissolved in ethanol, and 50 mL of zirconium nitrate ethanol solution was added dropwise with stirring. The reaction was carried out at 60 °C for 4 h to obtain an organometallic complex intermediate. Deionized water was added and the pH was adjusted to 8. The reaction was carried out at 50 °C for 24 h for hydrolysis and polycondensation. The reaction product was washed and dried to obtain the functionally enhanced modified product. Step 3: Mix 500g epoxy resin, 200g modified alumina, 80g zinc phosphate preservative, 5g BYK-2150 dispersant and 20g functional enhancement modifier, stir to form a composite coating. Step 4: Spray the composite coating onto the hinge substrate surface to form a wet film. Dry the wet film at room temperature for 10 minutes, bake at 80°C for 60 minutes, raise the temperature to 160°C, and hold for 120 minutes to ensure that the composite coating is firmly bonded to the hinge substrate, thereby obtaining a hinge composite coating with high anti-corrosion and wear-resistant properties.

[0026] Performance testing 1 Corrosion resistance test Referring to GB / T 10125-2021 standard, the coated hinge samples were sealed at the edges and placed in a salt spray chamber. A 5% sodium chloride solution was continuously sprayed at 35°C, and the salt spray deposition rate was controlled at 1.5 ± 0.5 mL (h·80cm²). 2 The test period was set at 500 hours. During this period, the corrosion status of the coating surface, such as rust spots, blistering, and scratch expansion, was observed and recorded every 24 hours. After the test, the corrosion area was rated according to GB / T 6461-2002 standard, with lower ratings being better.

[0027] 2. Abrasion resistance test According to GB / T 1768-2006 standard, the coating samples were fixed on a Taber abrasion tester, a CS-10 type grinding wheel was selected, and a load of 500g was applied for friction testing at 60 rpm. Pre-grinding was performed for 50 revolutions to remove surface unevenness, and then the mass loss was recorded every 500 revolutions until 2000 revolutions were completed. Finally, the abrasion resistance was evaluated based on the mass loss value and abrasion index, and the coating was checked for wear to the point of exposing the substrate, chalking, or cracking.

[0028] 3. Adhesion Test According to GB / T 9286-2021 standard, a 6×6 grid with 2mm spacing is drawn on the coating surface using a cross-cutting tool. The scratches must penetrate the coating to the substrate. After removing debris, 3M 600 grade tape is tightly applied and then quickly peeled off at a 60° angle. The extent of coating peeling in the grid areas is observed. A rating of 0-5 is assigned based on the percentage of peeling area (0: no peeling; 5: peeling > 65%).

[0029] Table 1 Performance Test Data

[0030] Table 1 shows that the salt spray test ratings of Examples 1-4 were all better than level 9 (rust area ≤ 0.1%); the Taber abrasion mass loss was all less than 18.5 mg, indicating excellent wear resistance; and the adhesion reached level 0 (no peeling), indicating that the coating was firmly bonded to the substrate. The coating of this invention did not show corrosion propagation within a 0.5 mm scratch width and maintained complete protective function under the coupled effects of 500 h of salt spray and 2000 rpm of abrasion, demonstrating significant high corrosion resistance and wear resistance. This is mainly due to: the phosphate-functionalized imidazoline-ammonium molybdate complex in the self-made corrosion inhibitor, which can construct a "smart slow-release" corrosion protection system in the coating. Its phosphate groups form a chemical adsorption layer with the metal substrate, enhancing interfacial bonding; the imidazoline ring provides an alkaline buffer environment, inhibiting local pH decrease; molybdate ions preferentially adsorb at the scratch and form a molybdate passivation film, effectively blocking chloride ion penetration and anodic dissolution, achieving self-inhibition of the corrosion process. Meanwhile, the functional enhancement modifier forms an "inorganic-organic interpenetrating network" within the coating through an organic-metal hybrid structure. The organic segments derived from the silane coupling agent covalently cross-link with the resin matrix, enhancing the coating's cohesion and toughness; the Zr-O-Si inorganic framework formed by zirconium ion hydrolysis and condensation significantly improves the coating's hardness and wear resistance. This structure also acts as a "microcapsule" for the corrosion inhibitor, gradually releasing active ingredients during wear to achieve a synergistic "wear-repair" process. In contrast, Comparative Example 1, without the functional enhancement modifier, lacked the organic-inorganic hybrid reinforcing phase, resulting in a loose structure, insufficient hardness, and a wear mass loss as high as 32.6 mg. Furthermore, the corrosion inhibitor was unevenly dispersed in the coating, leading to rapid corrosion expansion at scratches and a salt spray rating of only 5. Comparative Example 2 used zinc phosphate corrosion inhibitor, which has poor compatibility with the resin and easily aggregates to form microscopic defects, becoming stress concentration points during wear and accelerating coating peeling (adhesion drops to level 1). Meanwhile, zinc phosphate lacks a smart slow-release mechanism and is rapidly depleted in long-term salt spray environments, resulting in a significant decrease in its anti-corrosion durability (rated only level 4).

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing a hinge composite coating with high corrosion resistance and wear resistance, characterized in that, Includes the following steps: Step 1: Immerse the metal hinge substrate in an alkaline degreasing solution at 55-65℃ and treat it in an ultrasonic cleaner for 10-15 minutes; ultrasonically rinse it with deionized water and immerse it in an acid pickling solution for 5-10 minutes; then ultrasonically clean it with deionized water; finally, dry it in a forced-air drying oven at 105-110℃ for 25-35 minutes to obtain a clean and activated hinge substrate surface. Step 2: Mix the wear-resistant resin matrix, wear-resistant filler, corrosion inhibitor, BYK-2150 dispersant and functional enhancement modifier, stir, and form a composite coating. Step 3: Spray the composite coating onto the hinge substrate surface to form a wet film. Then, cure the wet film to ensure that the composite coating is firmly bonded to the hinge substrate, resulting in a hinge composite coating with high corrosion resistance and wear resistance.

2. The method for preparing the hinge composite coating with high corrosion resistance and wear resistance according to claim 1, characterized in that, In step 1, the metal hinge base is made of stainless steel, aluminum alloy, or titanium alloy.

3. The method for preparing the hinge composite coating with high corrosion resistance and wear resistance according to claim 1, characterized in that, In step 2, the wear-resistant resin matrix is ​​epoxy resin, polyurethane resin, or acrylic resin.

4. The method for preparing the hinge composite coating with high corrosion resistance and wear resistance according to claim 1, characterized in that, In step 2, the wear-resistant filler is modified alumina, modified silicon carbide, or boron nitride.

5. The method for preparing the hinge composite coating with high corrosion resistance and wear resistance according to claim 1, characterized in that, The preservative in step 2 is prepared as follows: C18 fatty acid and diethylenetriamine in a molar ratio of 1:(0.9-1.2) are added to a flask, and a dehydration cyclization reaction is carried out at 120-160℃ for 2-4 hours to obtain an imidazoline intermediate. The mixture is cooled to 50-70℃, and phosphoric acid is added. A phosphoric acid esterification reaction is carried out at 60-90℃ for 1-3 hours to obtain a phosphate-functionalized imidazoline compound. The phosphate-functionalized imidazoline compound is then dissolved in anhydrous ethanol, and an aqueous solution of ammonium molybdate is added. A complexation reaction is carried out at 30-60℃ for 0.5-2 hours. After the reaction is completed, the pH of the system is adjusted to 6.0-7.0 to obtain the preservative.

6. The method for preparing the hinge composite coating with high corrosion resistance and wear resistance according to claim 1, characterized in that, In step 2, the mass ratio of wear-resistant resin matrix, wear-resistant filler, preservative, dispersant, and functional enhancement modifier is (50-65):(20-30):(8-15):(0.5-2):(2-5).

7. The method for preparing the hinge composite coating with high corrosion resistance and wear resistance according to claim 6, characterized in that, The preparation method of the functionally enhanced modified material is as follows: Under a nitrogen atmosphere, γ-methacryloxypropyltrimethoxysilane, 2-aminobenzimidazole, and p-toluenesulfonic acid catalyst are dissolved in a mixed solvent of ethanol and toluene and subjected to reflux reaction. The organic precursor is obtained by vacuum distillation. The organic precursor is dissolved in ethanol, and an ethanol solution of zirconium nitrate is added dropwise under stirring. The reaction is carried out at 60-70℃ for 2-4 h to obtain an organometallic complex intermediate. Deionized water is added and the pH is adjusted to 8-9. The reaction is carried out at 50-60℃ for 12-24 h for hydrolysis and condensation. The reaction product is washed and dried to obtain the functionally enhanced modified material.

8. The method for preparing the hinge composite coating with high corrosion resistance and wear resistance according to claim 7, characterized in that, The ratio of γ-methacryloxypropyltrimethoxysilane, 2-aminobenzimidazole, and p-toluenesulfonic acid catalyst is 1 mol: (0.8-1.2) mol: (5-20) mmol.

9. The method for preparing the hinge composite coating with high corrosion resistance and wear resistance according to claim 7, characterized in that, The reflux reaction is carried out at a temperature of 80-90℃ for 4-8 hours.

10. The method for preparing the hinge composite coating with high corrosion resistance and wear resistance according to claim 1, characterized in that, The curing process in step 3 is as follows: dry at room temperature for 10-15 minutes, bake at 80-100℃ for 30-60 minutes, raise the temperature to 160-180℃, and hold for 60-120 minutes.

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