Composite anticorrosive coating structure for fastener

Abstract

The utility model discloses a composite anticorrosive coating structure for a fastener, which comprises a fastener base material, a nickel pre-plating layer is fixedly arranged on the surface of the fastener base material, a convex connecting part is fixedly arranged on the surface of the nickel pre-plating layer, and a zinc-aluminum layer is fixedly arranged on the surface of the convex connecting part. According to the composite anti-corrosion coating structure for the fastener, through the arrangement of the zinc-aluminum layer, the anti-corrosion assembly and the anti-pollution coating set, the zinc-aluminum layer forms a physical barrier for a fastener base material, corrosion resistance is improved, the molybdate passivation layer has excellent chemical corrosion resistance, corrosion of the fastener base material can be effectively prevented, and the service life of the fastener base material is prolonged. The organic coating of epoxy resin can effectively prevent invasion of chemical substances, the PVDF coating has the characteristics of extremely high corrosion resistance and low surface energy, dirt is not prone to being attached to the PVDF coating, the PTFE coating is good in corrosion resistance and has antifouling capacity, water, oil and other pollutants can be effectively prevented from being attached to the surface, dirt is not prone to being attached to the surface, and corrosion is further avoided.

Description

Technical Field

[0001] This utility model relates to the field of anti-corrosion coating technology, specifically to a composite anti-corrosion coating structure for fasteners. Background Technology

[0002] Fasteners are mechanical parts used to connect and secure different components, commonly found in various mechanical equipment, construction, automobiles, and electronic products. Their main function is to firmly connect two or more components together and withstand corresponding external forces, ensuring the stability and safety of the structure. Fasteners are susceptible to corrosion over prolonged use, therefore requiring the application of anti-corrosion coatings.

[0003] The graphene-modified high-corrosion-resistant zinc-aluminum coating for automotive fasteners disclosed in announcement number CN212800544U effectively solves the corrosion problem of automotive fasteners caused by long-term exposure to air. To a certain extent, it can extend the service life of fasteners and prevent traffic accidents caused by fastener corrosion and detachment during driving. The graphene water-based slurry layer not only beautifies the automotive fasteners but also prevents oxidation and seizing, thus facilitating later use. The silver plating layer and cadmium plating layer can achieve good bonding between the various plating layers.

[0004] However, the graphene-modified high-corrosion-resistant zinc-aluminum coating for automotive fasteners has the following disadvantages: it is not easy to improve the anti-fouling ability of the coating surface; long-term and large-scale contaminant adhesion to the coating surface will affect the service life of the coating. In addition, it is not easy to increase the adhesion of the coating, and the coating may peel off, affecting its service life. Utility Model Content

[0005] The technical problem to be solved by this utility model is as follows: it is not easy to improve the anti-fouling ability of the coating surface. If pollutants adhere to the coating surface for a long time, it will affect the service life of the coating. In addition, it is not easy to increase the adhesion of the coating, and the coating will peel off, affecting the service life.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A composite anti-corrosion coating structure for fasteners includes a fastener substrate, a nickel pre-plating layer fixedly disposed on the surface of the fastener substrate, a raised connecting portion fixedly disposed on the surface of the nickel pre-plating layer, a zinc-aluminum layer fixedly disposed on the surface of the raised connecting portion, an anti-corrosion component fixedly disposed on the surface of the zinc-aluminum layer, an anti-oxidation coating fixedly disposed on the surface of the anti-oxidation coating, and an anti-fouling coating assembly fixedly disposed on the surface of the anti-oxidation coating.

[0008] As a further aspect of this utility model: the number of the protruding connecting parts is several groups, and the several groups of protruding connecting parts are distributed in a rectangular array. The protruding connecting parts can increase the surface area of ​​the nickel pre-plating layer and increase the adhesion.

[0009] As a further embodiment of this utility model: the bottom surface of the zinc-aluminum layer is provided with a plurality of bonding and connecting parts in a rectangular array. The bonding and connecting parts are adapted to the protruding connecting parts and are used to connect the protruding connecting parts. While providing electrochemical protection, the zinc-aluminum layer can also reduce the direct contact between the external environment and the substrate, thereby improving the corrosion resistance.

[0010] As a further embodiment of this utility model: the anti-corrosion component includes a passivation layer and an organic coating. The passivation layer is fixedly disposed on the surface of the zinc-aluminum layer, and the organic coating is fixedly disposed on the surface of the passivation layer. The anti-corrosion component is used to improve the anti-corrosion performance of fasteners.

[0011] As a further aspect of this utility model: the passivation layer is made of molybdate, and the organic coating is made of epoxy resin. The molybdate passivation layer has excellent chemical corrosion resistance and can effectively prevent the substrate from corroding in humid, acidic or alkaline environments. The epoxy resin organic coating has high resistance to acids and alkalis and can effectively prevent the damage of chemical substances. Its high hardness gives it excellent wear resistance.

[0012] As a further embodiment of this utility model: the antifouling coating group includes a PVDF coating and a PTFE coating. The PVDF coating is fixedly disposed on the surface of the anti-oxidation coating, and the PTFE coating is fixedly disposed on the surface of the PVDF coating. The PVDF coating has extremely high corrosion resistance, high temperature resistance and chemical stability, and its low surface energy characteristics make it difficult for dirt to adhere, thus exhibiting excellent antifouling ability. The PTFE coating has good anti-corrosion performance and also has antifouling ability, effectively preventing water, oil and other pollutants from adhering to the surface.

[0013] As a further aspect of this utility model: the material of the antioxidant coating is titanium dioxide. The titanium dioxide antioxidant coating has anti-ultraviolet and anti-oxidation capabilities, which can improve the durability of the coating and prevent ultraviolet rays from damaging the coating.

[0014] The beneficial effects of this utility model are:

[0015] 1. Through the setup of zinc-aluminum layer, anti-corrosion components, and anti-fouling coating group, zinc-aluminum layer forms a physical barrier for fastener substrate, improving corrosion resistance; molybdate passivation layer has excellent chemical corrosion resistance, effectively preventing corrosion of fastener substrate; epoxy resin organic coating effectively prevents chemical damage; PVDF coating has extremely high corrosion resistance and low surface energy characteristics, making it difficult for dirt to adhere; PTFE coating has good corrosion resistance and anti-fouling ability, effectively preventing water, oil, and other pollutants from adhering to the surface, further preventing corrosion due to the difficulty of dirt adhesion.

[0016] 2. Through the setting of nickel pre-plating layer and raised connecting part, nickel has good adhesion, which improves the adhesion between zinc-aluminum layer and fastener substrate. Moreover, the raised connecting part on the surface of nickel pre-plating layer is connected to the bonding connecting part on the bottom surface of zinc-aluminum layer, which can greatly increase the contact area, making the composite coating better adhered to the fastener substrate, not easy to fall off, and with a long service life. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the zinc-aluminum layer and anti-corrosion component structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the antioxidant layer and anti-fouling coating assembly of this utility model;

[0021] Figure 4 This is a schematic diagram of the nickel pre-plating layer structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the overall disassembled structure of this utility model.

[0023] In the figure: 1. Fastener substrate; 2. Nickel pre-plating layer; 3. Protruding connection part; 4. Zinc-aluminum layer; 5. Anti-corrosion component; 501. Passivation layer; 502. Organic coating; 6. Anti-oxidation coating; 7. Anti-fouling coating group; 701. PVDF coating; 702. PTFE coating; 8. Adhesive connection part. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1-5 As shown, a composite anti-corrosion coating structure for fasteners includes a fastener substrate 1. A nickel pre-plating layer 2 is fixedly disposed on the surface of the fastener substrate 1, and a raised connecting portion 3 is fixedly disposed on the surface of the nickel pre-plating layer 2. Through the provision of the nickel pre-plating layer 2 and the raised connecting portion 3, nickel has good adhesion, which improves the adhesion between the zinc-aluminum layer 4 and the fastener substrate 1. Moreover, the raised connecting portion 3 on the surface of the nickel pre-plating layer 2 is connected to the bonding connecting portion 8 on the bottom surface of the zinc-aluminum layer 4, which can greatly increase the contact area, making the composite coating adhere better to the fastener substrate 1, less prone to falling off, and with a long service life.

[0026] A zinc-aluminum layer 4 is fixedly disposed on the surface of the protruding connecting part 3. An anti-corrosion component 5 is fixedly disposed on the surface of the zinc-aluminum layer 4. An anti-oxidation coating 6 is fixedly disposed on the surface of the anti-oxidation coating 6. An anti-fouling coating group 7 is fixedly disposed on the surface of the anti-oxidation coating 6. Through the arrangement of the zinc-aluminum layer 4, the anti-corrosion component 5 and the anti-fouling coating group 7, the zinc-aluminum layer 4 forms a physical barrier for the fastener substrate 1, improving corrosion resistance. The molybdate passivation layer 501 has excellent chemical corrosion resistance and can effectively prevent corrosion of the fastener substrate 1. The epoxy resin organic coating 502 can effectively prevent the attack of chemical substances. The PVDF coating 701 has extremely high corrosion resistance and low surface energy characteristics, making it difficult for dirt to adhere. The PTFE coating 702 has good corrosion resistance and anti-fouling ability, which can effectively prevent water, oil and other pollutants from adhering to the surface. Dirt is not easy to adhere to, further avoiding corrosion.

[0027] like Figure 4 As shown, there are several groups of protruding connecting parts 3, and these groups of protruding connecting parts 3 are distributed in a rectangular array.

[0028] The protruding connecting part 3 increases the contact area between the nickel pre-plating layer 2 and the zinc-aluminum layer 4.

[0029] like Figure 2 As shown, the bottom surface of the zinc-aluminum layer 4 has a rectangular array of several bonding connection parts 8, which are adapted to the protruding connection parts 3.

[0030] By fitting the connecting part 8, it serves to connect the protruding connecting part 3.

[0031] like Figure 2 As shown, the anti-corrosion component 5 includes a passivation layer 501 and an organic coating 502. The passivation layer 501 is fixedly disposed on the surface of the zinc-aluminum layer 4, and the organic coating 502 is fixedly disposed on the surface of the passivation layer 501.

[0032] like Figure 2 As shown, the passivation layer 501 is made of molybdate, and the organic coating 502 is made of epoxy resin.

[0033] With the addition of anti-corrosion component 5, the molybdate passivation layer 501 has excellent chemical corrosion resistance, effectively preventing the fastener substrate 1 from corroding in humid, acidic, or alkaline environments. The epoxy resin organic coating 502 has high resistance to acids and alkalis, effectively preventing the damage of chemical substances. Its high hardness gives it excellent wear resistance.

[0034] like Figure 3 As shown, the antifouling coating group 7 includes a PVDF coating 701 and a PTFE coating 702. The PVDF coating 701 is fixedly disposed on the surface of the anti-oxidation coating 6, and the PTFE coating 702 is fixedly disposed on the surface of the PVDF coating 701.

[0035] With the addition of the anti-fouling coating group 7, the PVDF coating 701 has extremely high corrosion resistance and low surface energy characteristics, making it difficult for dirt to adhere. The PTFE coating 702 has good corrosion resistance and anti-fouling ability, effectively preventing water, oil and other pollutants from adhering to the surface. The dirt is not easy to adhere to, further avoiding corrosion.

[0036] like Figure 3 As shown, the material of the antioxidant coating 6 is titanium dioxide.

[0037] With the addition of the antioxidant coating 6, the titanium dioxide antioxidant coating 6 has UV resistance and oxidation resistance, which can improve the durability of the coating and prevent UV damage to the coating.

[0038] The working principle of this utility model is as follows: The zinc-aluminum layer 4 forms a physical barrier on the fastener substrate 1, improving corrosion resistance; the molybdate passivation layer 501 has excellent chemical corrosion resistance and can effectively prevent corrosion of the fastener substrate 1; the epoxy resin organic coating 502 can effectively prevent the attack of chemical substances; the PVDF coating 701 has extremely high corrosion resistance and low surface energy characteristics, making it difficult for dirt to adhere; the PTFE coating 702 has good corrosion resistance and anti-fouling ability, effectively preventing water, oil and other pollutants from adhering to the surface, and the difficulty of dirt adhesion further avoids corrosion.

[0039] Nickel has good adhesion, which improves the adhesion between the zinc-aluminum layer 4 and the fastener substrate 1. Moreover, the raised connecting part 3 on the surface of the nickel pre-plated layer 2 is connected to the bonding connecting part 8 on the bottom surface of the zinc-aluminum layer 4, which can greatly increase the contact area, making the composite coating adhere better to the fastener substrate 1, less likely to fall off, and with a longer service life.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite anticorrosive coating structure for a fastener, comprising a fastener base material (1), characterized by: The surface of the fastener base material (1) is fixedly provided with a nickel pre-plating layer (2), the surface of the nickel pre-plating layer (2) is fixedly provided with a convex connecting part (3), the surface of the convex connecting part (3) is fixedly provided with a zinc-aluminum layer (4), the surface of the zinc-aluminum layer (4) is fixedly provided with an anti-corrosion assembly (5), the surface of the anti-corrosion assembly (5) is fixedly provided with an anti-oxidation coating (6), and the surface of the anti-oxidation coating (6) is fixedly provided with an anti-fouling coating group (7).

2. The composite anticorrosive coating structure for a fastener according to claim 1, wherein The number of the convex connecting parts (3) is several groups, and the several groups of the convex connecting parts (3) are distributed in a rectangular array.

3. The composite anticorrosive coating structure for fasteners according to claim 1, wherein The bottom surface of the zinc-aluminum layer (4) is provided with several fitting connecting parts (8) in a rectangular array, and the fitting connecting parts (8) are matched with the convex connecting parts (3).

4. The composite anticorrosive coating structure for a fastener according to claim 1, wherein The anti-corrosion assembly (5) comprises a passivation layer (501) and an organic coating (502), the passivation layer (501) is fixedly arranged on the surface of the zinc-aluminum layer (4), and the organic coating (502) is fixedly arranged on the surface of the passivation layer (501).

5. The composite anticorrosive coating structure for a fastener according to claim 4, wherein The material of the passivation layer (501) is molybdate, and the material of the organic coating (502) is epoxy resin.

6. The composite anticorrosive coating structure for fasteners according to claim 1, wherein The anti-fouling coating group (7) comprises a PVDF coating (701) and a PTFE coating (702), the PVDF coating (701) is fixedly arranged on the surface of the anti-oxidation coating (6), and the PTFE coating (702) is fixedly arranged on the surface of the PVDF coating (701).

7. The composite anticorrosive coating structure for fasteners according to claim 1, wherein The material of the anti-oxidation coating (6) is titanium dioxide.

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