A metal handicraft surface color plating adhesion enhancement structure

Abstract

The utility model relates to metal handicraft surface plating technology field, concretely to a kind of metal handicraft surface color plating layer adhesion reinforcing structure, including metal handicraft base body, pretreatment layer and color functional plating layer, the pretreatment layer covers the outer surface of metal handicraft base body, the color functional plating layer covers the outer surface of pretreatment layer, the pretreatment layer is the microcosmic rough structure layer formed by sand blasting treatment, and the surface roughness Ra value of this microcosmic rough structure is 1.2-3.2 μm, through the microcosmic rough structure of Ra value 1.2-3.2 μm formed by sand blasting treatment of pretreatment layer, the contact area of color functional plating layer can be increased, the physical adsorption force is improved by the effect of " mechanical occlusion " on the other hand, the conical protrusion of metal handicraft base body and pretreatment layer through cavity interfit, the adaptive structure of cooperation protruding chute and through cavity inclined resistance block, form three-dimensional mechanical lock, further block the path of plating layer along the base surface peeling.

Description

Technical Field

[0001] This utility model relates to the field of surface coating technology for metal crafts, specifically a structure for enhancing the adhesion of colored coatings on the surface of metal crafts. Background Technology

[0002] Metal crafts, with their delicate texture and diverse shapes, are widely used in decoration, gift collection, and daily furnishing. To enhance the aesthetics and market competitiveness of metal crafts, the industry generally adopts a process of coating their surfaces with colored plating. Through technologies such as vacuum ion plating and electroplating, colored functional layers such as titanium-based and chromium-based are formed, giving the products rich color expression and certain anti-corrosion properties.

[0003] However, existing colored coating technologies for metal crafts still have certain shortcomings in practical applications. The core problem lies in the insufficient adhesion stability between the coating and the substrate. In traditional processes, the surface of the metal substrate is often only subjected to simple grinding or chemical degreasing, resulting in low surface roughness (typically Ra value < 1.0 μm). The coating and the substrate mainly rely on physical adsorption to bond, lacking an effective mechanical interlocking structure. During long-term use, the coating is prone to peeling, flaking, and cracking due to changes in ambient temperature, minor impacts, or corrosive media, which seriously affects the appearance quality and service life of the product. Therefore, this utility model proposes a colored coating adhesion enhancement structure for the surface of metal crafts to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a structure that enhances the adhesion of colored coatings on the surface of metal crafts, so as to solve the problem of poor coating adhesion mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a colored coating adhesion enhancement structure for the surface of metal crafts, comprising a metal craft substrate, a pretreatment layer, and a colored functional coating, wherein the pretreatment layer covers the outer surface of the metal craft substrate, the colored functional coating covers the outer surface of the pretreatment layer, and the pretreatment layer is a micro-rough structure layer formed by sandblasting, and the surface roughness Ra value of the micro-rough structure is 1.2-3.2μm.

[0006] Preferably, the metal craft substrate is plated with a protrusion with a conical surface structure, and the pretreatment layer has a through cavity adapted to the protrusion. When the pretreatment layer covers the outer surface of the metal craft substrate, the protrusion and the through cavity are fitted together, and its conical surface is closely fitted with the inclined opening constructed in the through cavity.

[0007] Preferably, the raised conical surface has an inclined groove, and the outer peripheral wall of the inclined surface opening has an inclined abutment block adapted to the inclined groove.

[0008] Preferably, the surface of the inclined block has a notch, and the notch and the inclined groove combine to form a gel cavity.

[0009] Preferably, the pretreatment layer comprises, from the inside out, a pre-plated copper layer, a bright nickel plating layer, and a hydroxyl graphene-modified transition layer. The thickness of the pre-plated copper layer is 5-8 μm, the thickness of the bright nickel plating layer is 3-5 μm, and the thickness of the hydroxyl graphene-modified transition layer is 1-2 μm.

[0010] Preferably, the pre-plated copper layer is prepared using a polymeric thiocyanate electroplating process, the bright nickel plating layer is prepared using a Watt-type nickel plating solution, and the hydroxyl graphene modified transition layer is prepared using an electrophoretic deposition process with an electrophoretic deposition voltage of 80-120V.

[0011] Preferably, the colored functional coating is a titanium-based colored coating with a thickness of 2-4 μm, prepared using a vacuum ion plating process.

[0012] Compared with the prior art, the beneficial effects of this utility model are: The pretreatment layer is sandblasted to form a micro-rough structure with a Ra value of 1.2-3.2μm. Compared with the traditional low-roughness surface (Ra<1.0μm), this increases the contact area with the colored functional coating. The physical adsorption force is enhanced through the "mechanical interlocking" effect. On the other hand, the conical protrusion of the metal craft substrate is embedded with the cavity of the pretreatment layer. With the matching structure of the protrusion groove and the cavity inclined block, a three-dimensional mechanical locking is formed, which further blocks the path of coating peeling off along the substrate surface. At the same time, the gel cavity formed by the notch of the inclined block and the inclined groove can be filled with functional gel, which not only enhances the interlocking sealing, but also buffers the interlayer stress and avoids coating cracking caused by temperature changes or collisions. This fundamentally solves the core problem of traditional coatings being easy to peel off. Attached Figure Description Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the overall disassembled structure of this utility model.

[0014] Figure 3 This is a schematic diagram of the pretreatment layer structure of this utility model.

[0015] Figure 4 This is a schematic diagram of the connection structure between the protrusion and the cavity of this utility model.

[0016] In the figure: 1. Metal craft substrate; 11. Protrusion; 111. Sloping groove; 2. Pre-treatment layer; 21. Through cavity; 211. Sloping opening; 212. Sloping block; 213. Notch; 22. Pre-plated copper layer; 3. Color functional plating layer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1 to 4 This utility model provides a technical solution: a colored coating adhesion enhancement structure for the surface of a metal craft, comprising a metal craft substrate 1, a pretreatment layer 2, and a colored functional coating 3. The pretreatment layer 2 covers the outer surface of the metal craft substrate 1, and the colored functional coating 3 covers the outer surface of the pretreatment layer 2. The pretreatment layer 2 is a micro-rough structure layer formed by sandblasting, and the surface roughness Ra value of the micro-rough structure is 1.2-3.2μm.

[0019] By sandblasting the pretreatment layer 2, a micro-rough structure layer with a Ra value of 1.2-3.2 μm is formed. Compared with the traditional smooth surface (Ra < 1.0 μm), the contact area between the pretreatment layer 2 and the color functional coating layer 3 is increased, and the risk of slippage between the coating layer and the pretreatment layer 2 is reduced.

[0020] Please see Figures 1 to 4 Understandably, a conical protrusion 11 is plated onto the metal craft substrate 1. A pretreatment layer 2 has a cavity 21 adapted to the protrusion 11. When the pretreatment layer 2 covers the outer surface of the metal craft substrate 1, the protrusion 11 fits into the cavity 21, and its conical surface fits tightly into the inclined opening 211 constructed in the cavity 21. The conical surface of the protrusion 11 has an inclined groove 111. The outer peripheral wall of the inclined opening 211 has an inclined abutment 212 adapted to the inclined groove 111. The surface of the inclined abutment 212 has a notch 213. The notch 213 and the inclined groove 111 combine to form a gel cavity.

[0021] The tapered protrusion 11 of the metal craft substrate 1 is fitted into the cavity 21 of the pretreatment layer 2. The inclined groove 111 of the protrusion 11 and the inclined block 212 in the cavity 21 are matched to form a three-dimensional mechanical lock, which further blocks the path of the pretreatment layer 2 peeling off along the surface of the metal craft substrate 1. At the same time, the gel cavity formed by the notch 213 of the inclined block 212 and the inclined groove 111 can be filled with functional gel, which not only enhances the fitting and sealing, but also buffers the interlayer stress and avoids the coating cracking caused by temperature changes or collisions, thus solving the problem of easy peeling and detachment of traditional coatings.

[0022] Please see Figure 3It is understood that the pretreatment layer 2 consists of a pre-plated copper layer 22, a bright nickel plating layer, and a hydroxyl graphene modified transition layer from the inside out. The thickness of the pre-plated copper layer 22 is 5-8 μm, the thickness of the bright nickel plating layer is 3-5 μm, and the thickness of the hydroxyl graphene modified transition layer is 1-2 μm.

[0023] As the innermost layer of the pretreatment layer 2, the pre-plated copper layer 22 is in direct contact with the metal craft substrate 1. Its 5-8μm thickness and copper material provide excellent ductility and coverage of the metal craft substrate 1. It can closely adhere to the surface of the metal craft substrate 1, fill in the minor scratches, depressions and other defects caused by the processing of the metal craft substrate 1, and form a flat and smooth transition substrate. This avoids uneven deposition of subsequent plating layers due to unevenness of the surface of the metal craft substrate 1.

[0024] Please see Figure 3 It is understood that the pre-plated copper layer 22 is prepared by electroplating using a polymeric thiocyanate system, the bright nickel plating layer is prepared by electroplating using a Watt-type nickel plating solution, and the hydroxyl graphene modified transition layer is prepared by electrophoretic deposition, with an electrophoretic deposition voltage of 80-120V.

[0025] Because the electroplating solution of this system has good dispersibility and deep plating capability, it can deposit a copper layer on the surface of the metal craft substrate 1 (including fine depressions and corner areas), avoiding local missed plating or uneven plating thickness caused by the complex surface morphology of the metal craft substrate 1.

[0026] Please see Figure 2 It is understood that the colored functional coating 3 is a titanium-based colored coating with a thickness of 2-4 μm, which is prepared by vacuum ion plating process.

[0027] Because titanium-based materials have excellent chemical stability, they can form a dense oxide film in the air, which can effectively resist corrosive media such as water vapor, sweat, and mild acids and alkalis, and prevent the coating from fading, rusting and other problems after long-term use.

[0028] When using: First, based on the metal craft substrate 1, the conical protrusion 11 plated on its surface is fitted into the cavity 21 of the pretreatment layer 2. The conical surface of the protrusion 11 is tightly fitted into the inclined opening 211 of the cavity 21. With the engagement of the inclined groove 111 and the inclined block 212, a three-dimensional mechanical lock is formed, blocking the path of the pretreatment layer 2 peeling off along the substrate 1. The functional gel filling the gel cavity further enhances the fitting and sealing performance and buffers the interlayer stress, avoiding structural cracking caused by temperature changes or collisions. Among them, the pretreatment layer 2 is sandblasted to form a micro-rough structure with Ra 1.2-3.2μm, which increases the contact area with the color functional coating layer 3 and reduces the risk of slippage; and its multi-layer design of pre-plated copper layer 22 - bright nickel plating layer - hydroxyl graphene modified transition layer, the pre-plated copper layer 22 (5-8μm) fills the defects of the substrate 1 by polymer thiocyanate electroplating to provide a flat substrate, the bright nickel plating layer (3-5μm) is electroplated with Watt-type nickel plating solution to achieve protection, and the hydroxyl graphene modified transition layer (1-2μm) is electrophoretically deposited at 80-120V to strengthen the bonding with the color functional coating layer 3; Finally, the 2-4μm titanium-based colored functional coating 3 prepared by vacuum ion plating adheres tightly to the surface, relying on the structure and performance support of the pretreatment layer 2.

[0029] 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 structure for enhancing the adhesion of a colored coating on the surface of a metal craft, comprising a metal craft substrate (1), a pretreatment layer (2), and a colored functional coating (3), characterized in that: The pretreatment layer (2) covers the outer surface of the metal craft substrate (1), and the colored functional coating layer (3) covers the outer surface of the pretreatment layer (2); The pretreatment layer (2) is a micro-rough structure layer formed by sandblasting, and the surface roughness Ra value of the micro-rough structure is 1.2-3.2μm.

2. The structure for enhancing the adhesion of colored plating on the surface of metal crafts according to claim 1, characterized in that: The metal craft substrate (1) is plated with a conical protrusion (11). The pretreatment layer (2) has a cavity (21) adapted to the protrusion (11). When the pretreatment layer (2) covers the outer surface of the metal craft substrate (1), the protrusion (11) fits into the cavity (21), and its conical surface fits tightly into the inclined opening (211) constructed in the cavity (21).

3. The structure for enhancing the adhesion of colored plating on the surface of metal crafts according to claim 2, characterized in that: The protrusion (11) has a tapered surface with a groove (111), and the outer peripheral wall of the inclined surface opening (211) has a sloping block (212) that matches the groove (111).

4. The structure for enhancing the adhesion of colored plating on the surface of metal crafts according to claim 3, characterized in that: The inclined block (212) has a notch (213) on its surface, and the notch (213) and the inclined groove (111) combine to form a gel cavity.

5. The structure for enhancing the adhesion of colored plating on the surface of metal crafts according to claim 2, characterized in that: The pretreatment layer (2) includes, from the inside out, a pre-plated copper layer (22), a bright nickel plating layer, and a hydroxyl graphene modified transition layer. The thickness of the pre-plated copper layer (22) is 5-8 μm, the thickness of the bright nickel plating layer is 3-5 μm, and the thickness of the hydroxyl graphene modified transition layer is 1-2 μm.

6. The colored coating adhesion enhancement structure for metal crafts according to claim 5, characterized in that: The pre-plated copper layer (22) is prepared by electroplating with a polymer thiocyanate system, the bright nickel plating layer is prepared by electroplating with a Watt-type nickel plating solution, and the hydroxyl graphene modified transition layer is prepared by electrophoretic deposition with an electrophoretic deposition voltage of 80-120V.

7. The structure for enhancing the adhesion of a colored coating on the surface of a metal craft as described in claim 1, characterized in that: The colored functional coating (3) is a titanium-based colored coating with a thickness of 2-4 μm, and is prepared by vacuum ion plating process.

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