Hole sealing method, hole sealing device, surface treatment process and electronic equipment

Abstract

The invention discloses a hole sealing method, a hole sealing device, a surface treatment process and electronic equipment. The hole sealing method is applied to an anodic oxidation workpiece and comprises the steps that the anodic oxidation workpiece loaded on a tool is placed in electrolyte, and set voltage is applied to the electrolyte, so that the potential difference of the anodic oxidation workpiece and the potential difference of the tool are mutually balanced; wherein the anodic oxidation workpiece contains active metal, the tool is made of an insulating material, and the electrolyte is prepared by adopting a hole sealing agent. According to the hole sealing method, the falling risk of the oxidation film of the anodic oxidation workpiece can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of surface treatment technology, and more specifically, to a sealing method, a sealing device, a surface treatment process and an electronic device. Background Art

[0002] In the field of surface treatment, anodized aluminum is gradually used in the 3C electronics industry, and the current application of smart wearable structural parts is becoming more and more widespread. However, some anodized aluminum materials are prone to oxide film shedding after sealing. For example, the film layer of 7 series aluminum will have a point-like local shedding problem after sealing, and the existing sealing technology cannot improve this problem. Summary of the invention

[0003] One object of the present application is to provide a new technical solution for a sealing method, a sealing device, a surface treatment process and an electronic device.

[0004] According to a first aspect of the present application, a sealing method is provided, which is applied to an anodized workpiece, comprising:

[0005] Placing the anodized workpiece loaded on the tooling into an electrolyte, and applying a set voltage to the electrolyte so that the potential difference between the anodized workpiece and the tooling is balanced;

[0006] The anodized workpiece contains active metal, the tooling is made of insulating material, and the electrolyte is prepared with a sealing agent.

[0007] Optionally, the anodized workpiece is made of an aluminum alloy material, and the aluminum alloy material contains at least magnesium, the pH value of the electrolyte is 5-6.5, and the tooling is made of a titanium alloy material.

[0008] Optionally, the electrolyte contains nickel acetate.

[0009] Optionally, the set voltage has a value range of 3V to 5V.

[0010] Optionally, the setting voltage is applied for a time period of 600s to 900s.

[0011] Optionally, the temperature of the electrolyte is 90°C to 98°C.

[0012] According to a second aspect of the present application, a sealing device is provided, which is applied to the sealing method described in the first aspect, comprising:

[0013] A tank body, the tank body is used to contain electrolyte, the tank body is provided with a support structure, the support structure is used to support and fix a tooling loaded with anodized workpieces;

[0014] A rectifier circuit, the rectifier circuit is used to apply a set voltage to the electrolyte, and the negative electrode of the rectifier circuit can be connected to the tooling;

[0015] A graphite structure, wherein the graphite structure is fixedly disposed inside the tank body and connected to the positive electrode of the rectifier circuit;

[0016] The heating structure is used to heat the electrolyte.

[0017] Optionally, it also includes:

[0018] An air intake pipe, the air intake pipe is communicated with the interior of the tank body and is used to be connected to an air intake device;

[0019] The graphite structure includes a plurality of graphite plates, which are arranged in sequence and spaced apart from each other and close to two opposite side walls in the width direction of the tank body.

[0020] According to a third aspect of the present application, a surface treatment process is provided, which is applied to aluminum materials and includes:

[0021] Anodize the aluminum structural parts to form an oxide film with a porous structure on the surface to form an anodized workpiece;

[0022] Dyeing the anodized workpiece to form an anodized workpiece with a specific color;

[0023] The anodized workpiece having a specific color is sealed by the sealing method described in the first aspect of the claim; or,

[0024] The sealing device described in the second aspect is used to perform sealing treatment on the anodized workpiece with a specific color; wherein the anodized workpiece is connected to the negative electrode of the rectifier circuit.

[0025] According to a fourth aspect of the present application, an electronic device is provided, comprising: an aluminum structural member processed by the surface treatment process described in the third aspect.

[0026] According to one embodiment of the present application, the present application applies a set voltage to the electrolyte so that the potential difference between the anodized workpiece and the tooling can be balanced, thereby preventing the oxide film on the anodized workpiece from falling off due to the dissolution of the active metal, thereby improving the bonding strength between the oxide film and the substrate, and further improving the sealing effect of the anodized workpiece.

[0027] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0029] Figure 1 This is a microscopic photograph of the gaps between the pores of the oxide film formed by the sealing method in the prior art.

[0030] Figure 2 This is a microscopic photograph of the gaps between the pores of the oxide film obtained by the sealing method provided in this application.

[0031] Figure 3 It is a structural schematic diagram of a sealing device provided in this application.

[0032] Figure 4 yes Figure 3 Top view of the .

[0033] Figure 5 yes Figure 3 Side view of.

[0034] Description of reference numerals:

[0035] 1. Trough body; 11. Support structure; 2. Graphite plate; 3. Heating structure; 4. Air inlet pipe; 5. Water inlet pipe; 6. Water outlet pipe; 7. Oxide film; 71. Gap between holes. DETAILED DESCRIPTION

[0036] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0037] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0038] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0039] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0040] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0041] According to the first aspect of the present application, there is provided a sealing method for anodized workpieces, comprising: placing the anodized workpiece loaded on a tooling into an electrolyte, and applying a set voltage to the electrolyte so that the potential difference between the anodized workpiece and the tooling is balanced; wherein the anodized workpiece contains an active metal, the tooling is made of an insulating material, and the electrolyte is configured with a sealing agent.

[0042] Specifically, the anodized workpiece is a workpiece that has been surface treated by an anodizing process, and a porous oxide film 7 is formed on its surface. In practical applications, it can be placed in a dye for dyeing, and then sealed to form a workpiece with a specific color. During the sealing process, based on the presence of active metals in the anodized workpiece, and the anodized workpiece is usually loaded on the tooling and in contact with the tooling, under the action of the electrolyte, the anodized workpiece will form a primary battery with the tooling, making the anodized workpiece the negative electrode of the primary battery, and the tooling the positive electrode of the primary battery.

[0043] When the present application performs a sealing treatment on the anodized workpiece, a set voltage is applied to the electrolyte at the same time, so that the potential difference between the anodized workpiece and the tooling is balanced, which can prevent the two from forming a primary battery, thereby preventing the active metal on the oxide film 7 of the anodized workpiece from dissolving, improving the bonding between the oxide film 7 and the anodized workpiece substrate and reducing the occurrence of film falling. Among them, the potential difference between the anodized workpiece and the tooling is balanced, that is, the potential difference between the two is 0, or within a very small difference range.

[0044] In addition, in this process, under the action of the external electric field, some ions of the sealing agent in the electrolyte (such as Ni 2 + ) will move in a directional manner. Due to the existence of Körber electrolysis, the OH generated at the cathode - It will promote the generation of Ni(OH)2, and the generation rate and efficiency will be greatly accelerated, which is beneficial to enhance the sealing effect. Figure 1 and Figure 2 It can be seen that the inter-pore gaps 71 after sealing by the sealing method provided in the present application are obviously denser than the inter-pore gaps 71 without applying a set voltage in the prior art.

[0045] In the above embodiment, the method for determining the set voltage can be based on the Nernst equation: The electromotive force between the anodized workpiece and the tooling is calculated, and the set voltage is assigned according to the magnitude of the electromotive force; under the same conditions, the sealing results of different set voltage assignments are compared, and the optimal set voltage value can be quickly obtained, so that the film drop rate of the oxide film 7 is maintained within a certain range, thereby improving the surface treatment effect and service life of the product.

[0046] Optionally, the anodized workpiece is made of an aluminum alloy material, and the aluminum alloy material contains at least magnesium, the pH value of the electrolyte is 5-6.5, and the tooling is made of a titanium alloy material.

[0047] Specifically, in practical applications, aluminum alloy materials are widely used in the 3C electronics industry due to their advantages such as light weight and high strength, especially 7 series aluminum, which has high hardness, good fracture toughness and fatigue resistance, and has gradually replaced other alloy materials.

[0048] In one embodiment, the anodized workpiece is made of 7-series aluminum with 7% magnesium, and the tooling is made of titanium alloy material. The electrolyte uses a solution containing nickel acetate, the set voltage value range is 3V to 5V, the set voltage application time is 600s to 900s, and the electrolyte temperature is 90°C to 98°C. Among them, if the set voltage applied is too small or insufficient, the potential difference between the anodized workpiece and the tooling will be unbalanced, and the expected effect cannot be achieved. The oxide film on the anodized workpiece will fall off due to the dissolution of the active metal; if the set voltage is too large, the effect of improving the sealing effect will be reduced, resulting in unnecessary energy waste; setting the set voltage at 3V to 5V, for example 4V, can take into account both the sealing effect and energy consumption. When the application time of the set voltage is too short, the sealing effect cannot reach the expected value. When the application time of the set voltage reaches a certain level, the sealing effect will no longer change. Setting the application time of the set voltage to 600s~900s, such as 700s, 800s, etc., can take into account both the sealing effect and the sealing efficiency. If the application time of the set voltage is too long, it will only increase the waste of energy, but will not have a huge beneficial effect on the overall technical effect.

[0049] Furthermore, the sealing temperature also has a significant impact on the sealing effect. In the present application, by setting the temperature of the electrolyte to 90°C to 98°C, such as 95°C, the sealing effect and sealing efficiency can be taken into account. If the temperature is too low, such as below 90°C, specifically 60°C, some ions of the sealing agent in the electrolyte (such as Ni 2+ ) will cause the moving speed to slow down, resulting in the entire processing time being extended and the processing efficiency being reduced, and a temperature higher than 98°C is also not conducive to the sealing treatment. Therefore, in this application, by setting the temperature of the electrolyte to 90°C ~ 98°C, it can be more conducive to the sealing process.

[0050] In order to make the technical solution of the present application clearer, Example 1 (Solutions 1 to 20) and Example 2 (Solutions 21 to 25) are provided below to demonstrate the sealing effect of the sealing method provided in the present application.

[0051] In the following embodiments, the anodized workpieces are made of 7 series aluminum, the tooling material is made of titanium alloy, the electrolyte is made of nickel acetate, and the operation is performed according to the data in Table 1.

[0052] Specifically, the sealing temperature in each embodiment of this invention is 95°C. In Embodiment 1, the set voltage and sealing time are used as variables for testing. The conditions specified in the technical solution are adopted, such as Scheme 8 and Scheme 9, which basically control the film drop defect rate to 2% or less, meeting the production requirements. When a voltage lower than the preset voltage is adopted and the sealing time meets the conditions, such as Scheme 3 and Scheme 4, the film drop defect rate reaches 4%-9%, which obviously does not meet the requirements of processing and production.

[0053] The use of a preset voltage but not a sealing time also does not meet the production requirements. It should be noted that in this case, when the sealing time is higher than 900s, such as Scheme 10 and Scheme 15, the film drop defect rate obviously meets the requirements, but if the sealing time is too long, the processing cost will be increased. When the sealing time is lower than 600s, such as Scheme 6, Scheme 7, Scheme 11, and Scheme 12, the film drop defect rate reaches more than 9%, which obviously does not meet the requirements. In other schemes in Example 1, the defect rate is higher than 2%. Therefore, in Example 1, it can be seen that the voltage is set to 3-5V and the sealing time is set to 600-900s, which meets the protection of this scheme, and can optimally obtain a lower defect rate or eliminate the defect rate.

[0054] In Example 2, no voltage was set, and different gradient sealing times were used. The obtained film drop defect rates were all relatively high, which did not meet the processing requirements.

[0055] From the results of each embodiment in Table 1, it can be seen that when the anodized workpiece is made of 7-series aluminum and the tooling material is made of titanium alloy, since the anodized workpiece (Al) and the tooling (Ti) are located at the cathode, under the action of the applied voltage, the potential difference between the two will be balanced, which can prevent the Mg element at the bottom of the oxide film 7 from dissolving, avoid causing the bonding force between the oxide film 7 and the substrate to decrease, and reduce the film drop rate. According to the Nernst equation, it can be seen that:

[0056]

[0057] The above-mentioned potential difference can be eliminated by applying a set voltage. The value of the set voltage refers to the calculated value of the above-mentioned electromotive force. It can be seen from the film drop rate results in Table 1 that when the applied voltage is 3V to 5V, the sealing time is also controlled to be more than 600s, and the sealing temperature is set to 95°C, the film drop defect rate in Example 1 is significantly lower than the film drop rate in Example 2.

[0058] It can be seen from this that the sealing method for anodized workpieces provided in the present application improves the bonding force between the oxide film 7 and the substrate, reduces the film drop rate, and improves the sealing effect by applying a set voltage.

[0059] Table 1:

[0060]

[0061] like Figures 3 to 5 As shown, according to the second aspect of the present application, there is provided a sealing device, which is applied to the sealing method of the first aspect, comprising: a tank body 1, the tank body 1 is used to contain an electrolyte, a supporting structure 11 is provided on the tank body 1, the supporting structure 11 is used to support and fix a tooling loaded with anodized workpieces; a rectifier circuit, the rectifier circuit is used to apply a set voltage to the electrolyte, and the negative pole of the rectifier circuit can be connected to the tooling; a graphite structure, the graphite structure is fixedly arranged inside the tank body 1 and connected to the positive pole of the rectifier circuit; a heating structure 3, the heating structure 3 is used to heat the electrolyte.

[0062] Specifically, in this embodiment, an electrolyte can be set in the tank body 1, and a tooling loaded with an anodized workpiece is hung on the manufactured structure so that the anodized workpiece can be immersed in the electrolyte. In addition, the anodized workpiece and the tooling are both connected to the cathode of the rectifier circuit, and the graphite structure is connected to the positive electrode of the rectifier circuit, so that the rectifier circuit can apply a set voltage to the electrolyte. On the one hand, it can balance the potential difference between the anodized workpiece and the tooling, prevent the active metal from falling off the oxide film 7 of the anodized workpiece, improve the bonding force of the oxide film 7, and reduce the film drop rate. On the other hand, the application of the set voltage can promote the directional movement of ions in the electrolyte. Based on the existence of Kerber electrolysis, the ions generated at the cathode promote the generation of sealing materials, improve the sealing efficiency, and improve the sealing effect. Among them, the rectifier circuit can be realized by a rectifier.

[0063] In the above embodiment, the setting of the heating structure 3 can ensure that the temperature of the electrolyte is maintained at the required reaction temperature. Among them, the heating structure 3 can be a steam heat exchanger, which is laid at the bottom of the tank body 1 and has air inlets and outlets, so that external steam can be immersed in the heat exchanger to achieve the purpose of heating the electrolyte. It is set at the bottom to facilitate the temperature increase and avoid interference with the anodized workpiece.

[0064] Alternatively, if Figure 3 and Figure 4 As shown, it also includes: an air intake pipe 4, which is connected to the interior of the tank body 1 and is used to connect to the air intake device; the graphite structure includes a plurality of graphite plates 2, which are arranged in sequence at intervals and close to two opposite side walls of the tank body 1 in the width direction.

[0065] Specifically, in this embodiment, the air inlet pipe 4 is arranged so that air can be ventilated into the tank body 1, thereby bubbling the electrolyte, improving the reaction uniformity and reaction efficiency in the electrolyte, and improving the sealing efficiency and sealing effect. In addition, a plurality of graphite plates 2 are arranged at intervals on both sides of the tank body 1, which can further improve the uniformity of the cathode reaction in the electrolyte, improve the uniformity of the sealing of the surface of the anodized workpiece, and improve the sealing effect.

[0066] In addition, the tank body 1 may be provided with a water inlet pipe 5 and a water outlet pipe 6 connecting the inside and outside of the tank body 1, so as to realize the convenience of adding water and draining water to the tank body 1. Among them, the water inlet pipe 5 and the drainage pipe can be made of PVDF (polyvinylidene fluoride), which has good chemical corrosion resistance, high temperature resistance, excellent mechanical strength, electrical insulation and piezoelectricity, and the molecular chains of PVDF are closely arranged, so that it has high strength and toughness. When it is applied to pipelines, its service life can be improved. Furthermore, the outer ends of the water inlet pipe 5 and the drainage pipe can also be provided with valve structures such as ball valves for easy use.

[0067] According to the third aspect of the present application, there is provided a surface treatment process for aluminum materials, comprising: anodizing an aluminum structural member to generate an oxide film 7 having a porous structure on its surface to form an anodized workpiece; dyeing the anodized workpiece to form an anodized workpiece having a specific color; sealing the anodized workpiece having a specific color by the sealing method of the first aspect of the right; or, sealing the anodized workpiece having a specific color by the sealing device of the second aspect; wherein the anodized workpiece is connected to the negative pole of the rectifier circuit.

[0068] Specifically, in the present embodiment, after the aluminum material is anodized, the porous oxide film 7 formed on its surface can form a specific color after dyeing, thereby improving the surface effect of the aluminum material. Furthermore, the pores are sealed by the sealing method provided in the first aspect, so that the oxide film 7 has better bonding with the substrate, thereby preventing the film from falling off, etc., and improving the fastness of dyeing.

[0069] In addition, when the sealing device provided by the second aspect is used for sealing, it has a rectifier circuit, which can provide a set voltage to apply an external voltage to the electrolyte, which also improves the bonding strength between the oxide film 7 on the surface of the aluminum material and the substrate, and has a simple structure. Compared with the sealing device in the prior art, it can improve the sealing effect without increasing the sealing cost too much.

[0070] According to a fourth aspect of the present application, an electronic device is provided, comprising: an aluminum structural member processed by the surface treatment process of the third aspect.

[0071] Specifically, in this embodiment, the external structural parts such as the shell or back cover of the electronic device can be dyed and sealed using the surface treatment process of the third aspect. The aluminum structure formed has a good surface dyeing effect and is not easy to fade, which can increase the life of the electronic device.

[0072] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0073] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A sealing method, applied to an anodized workpiece, characterized in that: include: Placing the anodized workpiece loaded on the tooling into an electrolyte, and applying a set voltage to the electrolyte so that the potential difference between the anodized workpiece and the tooling is balanced; The anodized workpiece contains active metal, the tooling is made of insulating material, and the electrolyte is prepared with a sealing agent.

2. The sealing method according to claim 1, characterized in that: The anodized workpiece is made of an aluminum alloy material, and the aluminum alloy material contains at least magnesium. The pH value of the electrolyte is 5-6.5, and the tooling is made of a titanium alloy material.

3. The sealing method according to claim 2, characterized in that: The electrolyte contains nickel acetate.

4. The sealing method according to claim 2, characterized in that: The setting voltage has a value range of 3V to 5V.

5. The sealing method according to claim 1, characterized in that: The setting voltage is applied for a time period of 600s to 900s.

6. The sealing method according to claim 1, characterized in that: The temperature of the electrolyte is 90°C to 98°C.

7. A sealing device, applied to the sealing method according to any one of claims 1 to 6, characterized in that: include: A tank body, the tank body is used to contain electrolyte, the tank body is provided with a support structure, the support structure is used to support and fix a tooling loaded with anodized workpieces; A rectifier circuit, the rectifier circuit is used to apply a set voltage to the electrolyte, and the negative electrode of the rectifier circuit can be connected to the tooling; A graphite structure, wherein the graphite structure is fixedly disposed inside the tank body and connected to the positive electrode of the rectifier circuit; The heating structure is used to heat the electrolyte.

8. The sealing device according to claim 7, characterized in that: Also includes: An air intake pipe, the air intake pipe is communicated with the interior of the tank body and is used to be connected to an air intake device; The graphite structure includes a plurality of graphite plates, which are arranged in sequence and spaced apart and close to two opposite side walls in the width direction of the tank body.

9. A surface treatment process, applied to aluminum, characterized in that: include: Anodize the aluminum structural parts to form an oxide film with a porous structure on the surface to form an anodized workpiece; Dyeing the anodized workpiece to form an anodized workpiece with a specific color; The anodized workpiece having a specific color is sealed by the sealing method according to any one of claims 1 to 6; or, The sealing device according to claim 7 or 8 is used to perform sealing treatment on the anodized workpiece having a specific color; wherein the anodized workpiece is connected to the negative electrode of the rectifier circuit.

10. An electronic device, characterized in that: include: An aluminum structural part treated by the surface treatment process described in claim 9.

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