Coating structure of rust removal and rust prevention paint

Abstract

The utility model discloses a coating structure of rust removal and rust prevention paint. The coating structure comprises a metal base layer, a rust conversion layer, a primer layer and a finish layer, by means of the three-layer coating structure of the rust transforming agent, the primer layer and the finish paint layer, efficient protection on the metal surface is achieved. The rust conversion layer reacts with iron oxide in the rust to generate a stable complex or water-soluble iron salt, and the products can be firmly attached to the metal surface to form a protective film, so that the adhesive force and stability of the surface of a base material are enhanced, and further oxidation reaction is prevented; the primer layer provides excellent shielding performance and isolates the inner layer from an external corrosive medium; and the finishing coat layer is used as an outer protective barrier and has excellent weather resistance and wear resistance. The three layers of structures cooperate with one another, so that the service life of the metal material is effectively prolonged, and the corrosion resistance and the environmental adaptability are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of water-based coatings, and in particular to the coating structure of a rust-removing and rust-preventing coating. Background Technology

[0002] Metallic materials are widely used in construction, machinery, transportation, marine engineering, and other fields. However, under long-term use, especially in humid, salt spray, or highly polluted environments, metallic materials are highly susceptible to corrosion and rust. Corrosion not only reduces the mechanical strength, ductility, and fatigue resistance of metallic materials, but also causes equipment failure, structural damage, and even endangers safety.

[0003] Current technologies for treating rusted metal surfaces are relatively limited, typically employing only rust converters to transform the rust layer into a stable protective film. However, when the rust layer is thick or uneven, the conversion effect is poor, easily leaving residual active rust and exacerbating subsequent corrosion. Some technologies attempt to combine rust converters with anti-rust coatings, but poor material compatibility leads to insufficient coating adhesion and corrosion resistance, especially prone to secondary corrosion in humid or salt spray environments. Furthermore, traditional anti-rust coatings struggle to form a dense protective layer when rust is not completely removed, resulting in easy peeling and cracking, and unsatisfactory long-term protection. They also lack environmental friendliness and ease of application. Therefore, there is an urgent need for a coating structure that works effectively, combining rust conversion and long-term protection to improve the service life of metal materials and reduce maintenance costs. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the problems existing in the prior art, this utility model is proposed.

[0006] Therefore, the technical problem to be solved by this utility model is that the existing technology has a relatively simple treatment method for rusted metal surfaces and fails to provide good long-term and effective protection for metal surfaces.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a coating structure for a rust-removing and rust-preventing coating, comprising a metal substrate; and,

[0008] A rust-converting layer coated on the metal substrate, a primer layer coated on the rust-converting layer, and a topcoat layer coated on the primer layer.

[0009] As a preferred embodiment of the coating structure of the rust-removing and rust-preventing coating of this utility model, the metal substrate is a metal material that is prone to oxidation and corrosion in a normal atmospheric environment.

[0010] In a preferred embodiment of the coating structure of the rust-removing and rust-preventing coating of this utility model, the rust conversion layer is formed by brushing with rust conversion liquid.

[0011] In a preferred embodiment of the coating structure of the rust-removing and rust-preventing coating of this utility model, the primer layer is an epoxy metal primer layer.

[0012] In a preferred embodiment of the coating structure of the rust-removing and rust-preventing coating of this utility model, the topcoat layer is a two-component polyurethane topcoat layer.

[0013] In a preferred embodiment of the coating structure of the rust-removing and rust-preventing coating of this utility model, the thickness of the rust conversion liquid layer is 20-30μm, the thickness of the primer layer is 40-50μm, and the thickness of the topcoat layer is 30-40μm.

[0014] The beneficial effects of this invention are as follows: A three-layer coating structure consisting of a rust converter, an epoxy primer, and a two-component polyurethane topcoat achieves highly efficient protection of metal surfaces. The active ingredients in the rust converter (typically organic carboxylic acids, phosphates, and their salts) react with iron oxides in the rust to generate stable complexes or water-soluble iron salts. These products firmly adhere to the metal surface, forming a protective film that enhances the adhesion and stability of the substrate surface and prevents further oxidation. The epoxy primer provides excellent shielding performance, isolating the inner layer from external corrosive media. The polyurethane topcoat, as the outer protective barrier, possesses excellent weather resistance, abrasion resistance, and chemical corrosion resistance. These three layers work synergistically to effectively extend the service life of metal materials and significantly improve corrosion resistance and environmental adaptability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more readily understood, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments. Example

[0020] Reference Figure 1 The present invention provides a coating structure for a rust-removing and rust-preventing coating, comprising, from the inside out, a metal substrate 100, a rust conversion layer 200 coated on the metal substrate 100, a primer layer 300 coated on the rust conversion layer 200, and a topcoat layer 400 coated on the primer layer 300. The metal substrate 100 is a metal material that is prone to oxidation and corrosion in a normal atmospheric environment.

[0021] Furthermore, the rust conversion layer 200 is formed by brushing the rust conversion liquid. Brushing allows the rust conversion liquid to better penetrate into the pores of the rust and carry out a deep reaction.

[0022] Table 1 compares the results of applying rust converter to the same metal plates after a certain degree of rust treatment, using spraying and brushing methods respectively:

[0023] Spraying team: Use a spray gun to evenly spray the rust converter, ensuring surface coverage.

[0024] Brush application: Apply the rust converter with a brush, ensuring a uniform and thick coating.

[0025] Table 1 Comparison Data

[0026] As shown in the table above, the brushing method, due to its thicker and more uniform coating, allows the rust conversion liquid to penetrate the pores of the rust better, which can significantly improve the rust conversion effect, form a deeper black conversion layer on the surface, provide stronger adhesion, and show a longer corrosion resistance time in the salt spray test.

[0027] Furthermore, the primer layer 300 is an epoxy metal primer layer, and the topcoat layer 400 is a two-component polyurethane topcoat layer. Preferably, the thickness of the rust conversion layer 200 is 20-30μm, the thickness of the primer layer 300 is 40-50μm, and the thickness of the topcoat layer 400 is 30-40μm. The overall rust removal and rust prevention coating can achieve good results. The three-layer structure works together to effectively extend the service life of metal materials and significantly improve corrosion resistance and environmental adaptability.

[0028] Specifically, during construction, the surface of the cured rust conversion layer 200 will have a micron-level uneven structure. These microstructures provide more interlocking sites for the primer layer 300. When the epoxy primer is applied, it can partially penetrate into the pores of the rust conversion layer 200. After the metal primer cures, it forms a physical interlock, which enhances the mechanical adhesion of the coating. Furthermore, the high cross-linking density polymer network formed after the epoxy metal primer cures can provide effective mechanical support for the rust conversion layer and prevent the coating from cracking or peeling.

[0029] Furthermore, after the epoxy metal primer has cured, the two-component polyurethane topcoat applied has excellent weather resistance and chemical stability. Its dense coating further enhances the barrier effect against ultraviolet rays, moisture and corrosive substances. The resulting topcoat layer 400 provides better protection for the metal surface, making it more rust-resistant.

[0030] In summary, the coating system of this invention employs a rust-converting agent, an epoxy metal primer, and a two-component polyurethane topcoat, comprising a rust-converting layer 200, a primer layer 300, and a topcoat layer 400. This multi-layered structure, through scientifically optimized multi-layer synergistic effects, transforms loose rust on the metal surface into a dense passivation film, filling micropores and forming a rough surface, reducing subsequent corrosion. The epoxy metal primer penetrates and embeds into the microporous structure of the passivation layer, mechanically locking with its surface to form a stable primer layer 300, providing excellent adhesion and rust resistance. Finally, the two-component polyurethane topcoat 400 interlocks with the microporous structure of the epoxy primer surface, ensuring a tighter bond and enhancing the overall coating's stability, mechanical strength, and aesthetics. This ultimately forms a multi-layered protective system from the inside out. This multi-layered shielding makes it difficult for corrosive media to penetrate the entire coating system, significantly extending the rust-proof life of the metal and exhibiting excellent resistance to high salt spray and high humidity environments. The overall system achieves high adhesion between coating layers through physical locking, thus enhancing peel resistance.

[0031] It should be noted that in the prior art, rust converters or rust-preventive primers alone are mostly used for short-term protection. However, the coating structure of this utility model achieves a balance between long-term corrosion resistance and mechanical strength through scientific combination. It not only has the functions of rust removal, rust prevention, and long-term protection, but also has excellent adhesion and mechanical properties, which significantly improves the overall performance of the coating, breaks through the limitations of the prior art, and provides a new solution for metal surface protection.

[0032] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the utility model's technical solution, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A coating structure for a rust-removing and rust-preventing coating, characterized in that: From the inside out, it includes, Metal substrate (100); and, A rust conversion layer (200) coated on the metal substrate (100), a primer layer (300) coated on the rust conversion layer (200), and a topcoat layer (400) coated on the primer layer (300). The rust conversion layer (200) is a rust conversion liquid with a thickness of 20-30 μm and its surface has a micron-level uneven structure; Part of the material of the primer layer (300) is embedded in the uneven structure of the rust conversion layer (200) to form a physical fit.

2. The coating structure of the rust-removing and rust-preventing coating as described in claim 1, characterized in that: The metal substrate (100) is a metal material that is prone to oxidation and corrosion in the atmospheric environment.

3. The coating structure of the rust-removing and rust-preventing coating as described in claim 2, characterized in that: The primer layer (300) is an epoxy metal primer layer.

4. The coating structure of the rust-removing and rust-preventing coating as described in claim 3, characterized in that: The topcoat layer (400) is a two-component polyurethane topcoat layer.

5. The coating structure of the rust-removing and rust-preventing coating as described in claim 4, characterized in that: The thickness of the rust conversion layer (200) is 20-30 μm, the thickness of the primer layer (300) is 40-50 μm, and the thickness of the topcoat layer (400) is 30-40 μm.

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