Anticorrosive coating and method for producing the same

Abstract

This invention provides an anti-corrosion coating and its preparation method. The anti-corrosion coating includes: a water-based anti-corrosion coating as a base material; titanium dioxide powder, graphene powder, flake graphite, and silver powder added to the water-based anti-corrosion coating; wherein the mass ratio of titanium dioxide powder to the water-based anti-corrosion coating is 1:2; the mass ratio of titanium dioxide powder, graphene powder, and flake graphite is 25:1:10; and the mass ratio of silver powder to the water-based anti-corrosion coating is 0.01:10 to 5:10. The anti-corrosion coating of this invention has good corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of corrosion protection technology, and in particular to an anti-corrosion coating and its preparation method. Background Technology

[0002] When the surfaces of shielded electromagnetic equipment, signal towers, and other similar devices are exposed to air or in contact with the ground for extended periods, chemical and electrochemical corrosion often occurs. Currently, the most common method of corrosion prevention is to apply anti-corrosion coatings to form a protective layer. Therefore, it is necessary to develop a coating that provides good corrosion protection without polluting the environment. Summary of the Invention

[0003] In view of this, the present invention provides an anti-corrosion coating and its preparation method, which has good corrosion resistance.

[0004] In a first aspect, the present invention provides an anti-corrosion coating, the anti-corrosion coating comprising:

[0005] Water-based anti-corrosion coatings as a base material;

[0006] Titanium dioxide powder, graphene powder, flake graphite, and silver powder are added to the water-based anti-corrosion coating.

[0007] The mass ratio of the titanium dioxide powder to the water-based anti-corrosion coating is 1:2.

[0008] The mass ratio of the titanium dioxide powder, the graphene powder, and the flake graphite is 25:1:10.

[0009] The mass ratio of the silver powder to the water-based anti-corrosion coating is 0.01:10 to 5:10.

[0010] Optionally, the waterborne anti-corrosion coating is one of waterborne polyurethane coating, waterborne epoxy resin coating, and waterborne acrylic resin coating.

[0011] Secondly, the present invention provides a method for preparing an anti-corrosion coating, the method comprising:

[0012] Titanium dioxide powder, graphene powder, and flake graphite are added to a water-based anti-corrosion coating to obtain a first mixed slurry, wherein the mass ratio of titanium dioxide powder to the water-based anti-corrosion coating is 1:2, and the mass ratio of titanium dioxide powder, graphene powder, and flake graphite is 25:1:10.

[0013] Stir the first mixed slurry until it is homogeneous;

[0014] Silver powder is added to the first mixed slurry that has been stirred evenly to obtain a second mixed slurry, wherein the mass ratio of the silver powder to the water-based anti-corrosion coating is 0.01:10 to 5:10.

[0015] The second mixed slurry was subjected to ultrasonic treatment for 20–30 minutes;

[0016] The second mixed slurry after ultrasonic treatment was magnetically stirred for more than 2 hours.

[0017] Optionally, the waterborne anti-corrosion coating is one of waterborne polyurethane coating, waterborne epoxy resin coating, and waterborne acrylic resin coating.

[0018] The anti-corrosion coating and its preparation method provided by this invention employ a physicochemical combination miscibility method. Titanium dioxide powder, graphene powder, flake graphite, and silver powder are added to an aqueous anti-corrosion coating to form a composite coating. The resulting coating contains C, O, Ag, and Ti elements, which are uniformly distributed on the coating surface. Silver powder, as a filler, is dispersed in the coating, extending the penetration path of corrosive media. This composite coating achieves organic-inorganic hybrid anti-corrosion, exhibiting better anti-corrosion performance. Simultaneously, the smooth properties of graphene powder and flake graphite effectively disperse titanium dioxide and silver particles, improving the dispersibility of the coating. Attached Figure Description

[0019] Figure 1 This is a scanning electron microscope image of coatings with different silver powder contents before and after immersion in a 3.5 wt% sodium chloride solution for 360 h, according to one embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] One embodiment of the present invention provides an anti-corrosion coating, the anti-corrosion coating comprising:

[0024] Water-based anti-corrosion coatings as a base material;

[0025] Titanium dioxide powder, graphene powder, flake graphite, and silver powder are added to water-based anti-corrosion coatings.

[0026] The mass ratio of titanium dioxide powder to water-based anti-corrosion coating is 1:2.

[0027] The mass ratio of titanium dioxide powder, graphene powder, and flake graphite is 25:1:10.

[0028] The mass ratio of silver powder to water-based anti-corrosion coating is 0.01:10 to 5:10.

[0029] As one implementation method, the waterborne anti-corrosion coating is one of waterborne polyurethane coating, waterborne epoxy resin coating, and waterborne acrylic resin coating.

[0030] The anti-corrosion coating provided in this invention employs a physicochemical miscibility method, adding titanium dioxide powder, graphene powder, flake graphite, and silver powder to an aqueous anti-corrosion coating to form a composite coating. The resulting coating contains C, O, Ag, and Ti elements, which are uniformly distributed on the coating surface. Silver powder, acting as a filler, is dispersed within the coating, extending the penetration path of corrosive media. This composite coating achieves organic-inorganic hybrid anti-corrosion, exhibiting superior anti-corrosion performance. Furthermore, the smooth properties of graphene powder and flake graphite effectively disperse titanium dioxide and silver particles, improving the coating's dispersibility.

[0031] In order to find the optimal proportion of silver powder in the anti-corrosion coating provided in the embodiments of the present invention, the anti-corrosion performance of composite coatings with different silver powder contents was compared by experimental methods.

[0032] The experiment used waterborne polyurethane coatings, with polyurethane as the solute and deionized water as the solvent. The mass ratio of polyurethane to water was 1:1. After determining the amounts of titanium dioxide powder, graphene powder, and flake graphite, silver powder was added in different proportions to compare their anti-corrosion performance.

[0033] Four different proportions of silver powder were prepared into composite anti-corrosion coatings, with the mass ratio of silver powder to waterborne polyurethane coating being 0.01:10, 0.1:10, 1:10, and 5:10.

[0034] For example, if you take 10g of waterborne polyurethane coating, you can add 5g of titanium dioxide powder, 0.2g of graphene powder, and 2g of flake graphite to the waterborne polyurethane coating. The amount of silver powder added is 0.01g, 0.1g, 1g, and 5g, respectively.

[0035] The sample used in the experiment to evaluate the anti-corrosion performance of the coating was 5A06 aluminum alloy, with sample dimensions of 20mm × 20mm × 2mm. The surface of the aluminum alloy sample was polished with 1000# sandpaper, and the polished sample was wiped clean with anhydrous ethanol.

[0036] A total of 20 aluminum alloy samples are needed, divided into 4 groups of 5 samples each. The 4 groups of samples correspond to 4 different proportions of silver powder in the anti-corrosion coatings.

[0037] A composite anti-corrosion coating with different proportions of silver powder was sprayed onto the substrate surface of each group of aluminum alloy samples using a cold spraying method to form a uniformly distributed coating on the sample surface with a thickness controlled between 10 and 30 μm. The samples were then placed in a drying oven at 100°C for 2 hours to dry.

[0038] Two samples were selected from each group and immersed in a 3.5wt% sodium chloride solution at 50℃ for 360 hours.

[0039] After soaking, the samples were dried and then characterized to examine the performance of the anti-corrosion coating.

[0040] The properties of the coating can be characterized by the coating morphology observed using scanning electron microscopy (SEM). The coating morphology was observed under an accelerating voltage of 20 kV using SEM. Prior to testing, the coating was coated with gold.

[0041] Figure 1 The surface morphology of coatings with different silver powder contents before and after immersion in 3.5 wt% sodium chloride solution for 360 h is shown. (a) shows the morphology of the coating with 0.01g of silver powder before immersion in 3.5wt% sodium chloride solution; (b) shows the morphology of the coating with 0.01g of silver powder after immersion in 3.5wt% sodium chloride solution; (c) shows the morphology of the coating with 0.1g of silver powder before immersion in 3.5wt% sodium chloride solution; (d) shows the morphology of the coating with 0.1g of silver powder after immersion in 3.5wt% sodium chloride solution; (e) shows the morphology of the coating with 1g of silver powder before immersion in 3.5wt% sodium chloride solution; (f) shows the morphology of the coating with 1g of silver powder after immersion in 3.5wt% sodium chloride solution; (g) shows the morphology of the coating with 5g of silver powder before immersion in 3.5wt% sodium chloride solution; and (h) shows the morphology of the coating with 5g of silver powder after immersion in 3.5wt% sodium chloride solution.

[0042] from Figure 1As can be seen, when the amount of silver powder added is 0.01g, the particle size of the coating surface before immersion is uneven, such as... Figure 1 As shown by the arrow in (a), irregular holes appear in the middle. After immersion, overall corrosion occurs on the coating surface, and the corrosion products exhibit a loose and porous morphology, such as... Figure 1 As shown in (b), the elliptical and irregularly shaped regions have holes and hole connections that extend to form elongated crack-like holes and macropores.

[0043] When the amount of silver powder added increased to 0.1g, more noticeable uneven particles appeared in the coating before immersion. Compared to the amount of silver powder added at 0.01g, the smaller pores connected together to form crack-like pores, such as... Figure 1 As shown by the rectangular marker in (c). After soaking, a noticeable crack appeared at the bottom arrow. Figure 1 As shown in the elliptical region in (d), there is also a cavity similar to a crack.

[0044] When the amount of silver powder added was further increased to 1g, the coating surface was smooth and flat, no microcracks were observed in the SEM image, the coating was dense, and no obvious corrosion products were observed after immersion.

[0045] When 5g of silver powder was added, the coating became rougher, and the irregular particles were more noticeable. This may be because excessive silver powder prevented the graphite from performing its lubricating function effectively. Figure 1 As shown in the rectangle in (g), there are now more crack-like pores that are developing into cracks, as... Figure 1 As shown at the bottom of (g). After immersion, pentagonal star-shaped corrosion product residues appeared on the coating, as shown. Figure 1 As indicated by the marking in (h), numerous small cracks continue to corrode, eventually converging into more severe fracture corrosion. This is likely due to the excessive addition of silver powder, causing the titanium dioxide layer to fail to fully support the graphite. The exposed silver powder forms corrosive microcells, accelerating corrosion.

[0046] Experimental results show that adding 1g of silver powder to 10g of waterborne polyurethane coating (i.e., the mass ratio of silver powder to waterborne polyurethane coating is 1:10) for organic-inorganic hybrid corrosion protection results in the best corrosion resistance after a period of time.

[0047] On the other hand, one embodiment of the present invention provides a method for preparing an anti-corrosion coating, the method comprising the following steps:

[0048] S11, titanium dioxide powder, graphene powder and flake graphite are added to the water-based anti-corrosion coating to obtain the first mixed slurry, wherein the mass ratio of titanium dioxide powder to water-based anti-corrosion coating is 1:2, and the mass ratio of titanium dioxide powder, graphene powder and flake graphite is 25:1:10.

[0049] S12, Stir the first mixed slurry evenly;

[0050] S13, add silver powder to the first mixed slurry that has been stirred evenly to obtain the second mixed slurry. The mass ratio of silver powder to water-based anti-corrosion coating is 0.01:10 to 5:10.

[0051] S14, the second mixed slurry is ultrasonically treated for 20-30 minutes;

[0052] S15, the second mixed slurry after ultrasonic treatment is magnetically stirred for more than 2 hours.

[0053] As one implementation method, the waterborne anti-corrosion coating is one of waterborne polyurethane coating, waterborne epoxy resin coating, and waterborne acrylic resin coating.

[0054] The method for preparing the anti-corrosion coating provided in this embodiment of the invention is used to prepare the anti-corrosion coating of the aforementioned embodiment and has the same technical effect.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A corrosion protection coating, characterized in that, The anti-corrosion coating includes: Water-based anti-corrosion coatings used as base materials; Titanium dioxide powder, graphene powder, flake graphite, and silver powder are added to the water-based anti-corrosion coating. The mass ratio of the titanium dioxide powder to the water-based anti-corrosion coating is 1:

2. The mass ratio of the titanium dioxide powder, the graphene powder, and the flake graphite is 25:1:

10. The mass ratio of the silver powder to the water-based anti-corrosion coating is 1:

10.

2. The anti-corrosion coating according to claim 1, characterized in that, The water-based anti-corrosion coating is one of water-based polyurethane coating, water-based epoxy resin coating, and water-based acrylic resin coating.

3. A method for preparing an anti-corrosion coating, characterized in that, The preparation method includes: Titanium dioxide powder, graphene powder, and flake graphite are added to a water-based anti-corrosion coating to obtain a first mixed slurry, wherein the mass ratio of titanium dioxide powder to the water-based anti-corrosion coating is 1:2, and the mass ratio of titanium dioxide powder, graphene powder, and flake graphite is 25:1:

10. Stir the first mixed slurry until it is homogeneous; Silver powder is added to the first mixed slurry that is stirred evenly to obtain a second mixed slurry, wherein the mass ratio of the silver powder to the water-based anti-corrosion coating is 1:

10. The second mixed slurry was subjected to ultrasonic treatment for 20-30 minutes; The second mixed slurry after ultrasonic treatment was magnetically stirred for more than 2 hours.

4. The preparation method according to claim 3, characterized in that, The water-based anti-corrosion coating is one of water-based polyurethane coating, water-based epoxy resin coating, and water-based acrylic resin coating.

Images