A low-porosity nanoscale bright tin plating bath structure

Abstract

This utility model discloses a low-porosity nanoscale bright tin plating tank structure. The low-porosity nanoscale bright tin plating tank structure includes a tank body, an anode plate, a cathode roller, an electrolyte circulation pump, an outlet pipe, a heater, and an inlet pipe. Electrolyte is placed inside the tank body. The anode plate and cathode roller are respectively disposed on both sides of the tank body. The anode plate is connected to the positive terminal of a power supply, and the cathode roller is connected to the negative terminal of the power supply, serving to fix the workpiece. One end of the outlet pipe extends into the tank body, and the other end is connected to the first, second, and third terminals of the electrolyte circulation pump. One end of the inlet pipe is connected to the fourth terminal of the electrolyte circulation pump, and the other end of the inlet pipe has a spray hole facing the cathode roller. This low-porosity nanoscale bright tin plating tank structure can form a low-porosity nanoscale bright tin plating layer on the surface of the workpiece, thereby improving the electroplating quality of the workpiece.

Description

Technical Field

[0001] This utility model relates to the field of electroplating tank technology, and in particular to a low-porosity nanoscale bright tin plating tank structure. Background Technology

[0002] Tin plating, as a mature surface treatment process, is widely used for the protection and decoration of precision components such as electronic components, semiconductor lead frames, and connectors. A high-quality tin plating layer must possess good solderability, corrosion resistance, and a bright, smooth appearance.

[0003] However, traditional electroplating tank structures have significant limitations in achieving low porosity and highly uniform nanoscale coatings. For example, the flow of electrolyte within the tank often relies on simple stirring or overflow methods, resulting in turbulent flow or dead zones and uneven flow field distribution. This unevenness directly causes differences in current density, ion concentration, and temperature across different parts of the workpiece during electroplating, leading to problems such as uneven coating thickness and rough crystals. Uneven fluid distribution exacerbates concentration polarization during the electrochemical process. Metal ions near the cathode surface are rapidly consumed and cannot be replenished promptly and uniformly, making the deposition process unstable and prone to forming a loose, porous coating structure. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a low-porosity nanoscale bright tin plating tank structure, which aims to improve the limitations of traditional plating tank structures in pursuing low porosity and high uniformity nanoscale plating.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A low-porosity nanoscale bright tin plating tank structure includes a tank body, an anode plate, a cathode roller, an electrolyte circulation pump, an outlet pipe, a heater, and an inlet pipe; The tank is filled with an electrolyte. The anode plate and the cathode roller are respectively disposed on both sides of the tank. The anode plate is connected to the positive terminal of the power supply, and the cathode roller is connected to the negative terminal of the power supply. The cathode roller is used to fix the workpiece. One end of the outlet pipe extends into the tank, and the other end of the outlet pipe is connected to the first end of the electrolyte circulation pump. One end of the heater is connected to the second end of the electrolyte circulation pump, and the other end of the heater is connected to the third end of the electrolyte circulation pump. One end of the inlet pipe is connected to the fourth end of the electrolyte circulation pump, and the other end of the inlet pipe is provided with a spray hole. The electrolyte circulation pump includes a first chamber and a second chamber. The first chamber is connected to the first end and the second end, respectively, and the second chamber is connected to the third end and the fourth end, respectively.

[0006] As a further description of the above technical solution: a distribution plate is provided at the bottom of the tank, and the distribution plate is provided with distribution holes that cooperate with the injection holes, and a third chamber is formed between the distribution plate and the bottom plate of the tank.

[0007] As a further description of the above technical solution: a pH sensor is provided on the inner wall of the tank.

[0008] As a further description of the above technical solution: the cathode roller is mounted on the tank body via an insulating sleeve.

[0009] As a further description of the above technical solution: the cathode roller is cylindrical, and the insulating sleeve is provided with mounting holes that mate with the cathode roller.

[0010] As a further description of the above technical solution: the liquid inlet pipe includes a first branch pipe, a second branch pipe and a third branch pipe, and the first branch pipe, the second branch pipe and the third branch pipe are all provided with the spray hole.

[0011] As a further description of the above technical solution: the outer surface of the groove is provided with a plurality of annular protrusions at intervals.

[0012] As a further description of the above technical solution: the heater has a continuously bent multi-U-shaped structure.

[0013] This utility model has the following beneficial effects: This low-porosity, nanoscale bright tin plating tank structure involves fixing the workpiece to the cathode roller and connecting it to the negative terminal of the power supply, while the anode plate is connected to the positive terminal. The tank is filled with an electrolyte containing tin ions. After starting the electrolyte circulation pump, the electrolyte in the tank enters the outlet pipe from one end, then flows from the other end of the outlet pipe through the first end of the electrolyte circulation pump into the first chamber of the pump. Next, the electrolyte flows from the second end of the pump through one end of the heater into the heater, then from the other end of the heater through the third end of the pump into the second chamber of the pump. Finally, the electrolyte flows from the fourth end of the pump through one end of the inlet pipe into the inlet pipe, and then from the other end of the inlet pipe, it is sprayed through the nozzle towards the cathode roller, creating a stable and uniform upward laminar flow of electrolyte within the tank. The heater provides precise temperature rise and constant temperature control for the electrolyte, making the electroplating process more accurate and controllable.

[0014] After energization, the anode plate undergoes an oxidation reaction, and metallic tin continuously dissolves and enters the electrolyte in ionic form. Under the influence of the electric field, the tin ions migrate towards the cathode roller and undergo a reduction reaction on the workpiece on the cathode roller surface, forming a metallic tin plating layer. It can be seen that this low-porosity, nanoscale bright tin plating tank structure ensures that the flow rate, temperature, and ion concentration of the electrolyte are highly consistent throughout the cathode roller surface, effectively eliminating the thickness differences in the tin plating layer caused by uneven fluid distribution. This facilitates the formation of a low-porosity, nanoscale bright tin plating layer, thereby improving the electroplating quality of the workpiece. Attached Figure Description

[0015] Figure 1 This is a perspective view of a low-porosity nanoscale bright tin plating tank structure proposed in this utility model. Figure 2 This is a partial structural schematic diagram of a low-porosity nanoscale bright tin plating tank structure proposed in this utility model. Figure 3 This is another partial structural schematic diagram of a low-porosity nanoscale bright tin plating tank structure proposed in this utility model.

[0016] Legend: 1. Tank body; 2. Anode plate; 3. Cathode roller; 4. Electrolyte circulation pump; 5. Discharge pipe; 6. Heater; 7. Inlet pipe; 8. pH sensor; 9. Spray hole; 10. Distribution plate; 11. Insulating sleeve. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0018] It should be noted that when an element is said to be "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] Reference Figures 1-3 This utility model provides a low-porosity nanoscale bright tin plating tank structure, comprising a tank body 1, an anode plate 2, a cathode roller 3, an electrolyte circulation pump 4, an outlet pipe 5, a heater 6, and an inlet pipe 7. The tank body 1 contains electrolyte. The anode plate 2 and cathode roller 3 are respectively located on both sides of the tank body 1. The anode plate 2 is connected to the positive terminal of a power supply, and the cathode roller 3 is connected to the negative terminal of a power supply, serving to fix the workpiece. One end of the outlet pipe 5 extends into the tank body 1, and the other end is connected to the first end of the electrolyte circulation pump 4. One end of the heater 6 is connected to the second end of the electrolyte circulation pump 4, and the other end is connected to the third end of the electrolyte circulation pump 4. One end of the inlet pipe 7 is connected to the fourth end of the electrolyte circulation pump 4, and the other end of the inlet pipe 7 has a spray hole 9 facing the cathode roller 3. The electrolyte circulation pump includes a first chamber and a second chamber. The first chamber is connected to the first and second ends respectively, and the second chamber is connected to the third and fourth ends respectively.

[0021] In this low-porosity, nanoscale bright tin plating tank structure, the workpiece is fixed on the cathode roller 3 and connected to the negative terminal of the power supply during electroplating, while the anode plate 2 is connected to the positive terminal. The tank 1 is filled with an electrolyte containing tin ions. After starting the electrolyte circulation pump 4, the electrolyte in the tank 1 enters the outlet pipe 5 through one end, and then enters the first chamber of the electrolyte circulation pump 4 through the first end of the outlet pipe 5. Next, the electrolyte enters the heater 6 through the second end of the electrolyte circulation pump 4 through one end of the heater 6. Then, the electrolyte enters the second chamber of the electrolyte circulation pump 4 through the third end of the heater 6. Next, the electrolyte enters the inlet pipe 7 through the fourth end of the electrolyte circulation pump 4 through one end of the inlet pipe 7. Finally, the electrolyte is sprayed from the other end of the inlet pipe 7 towards the cathode roller 3 through the spray hole 9, so that the electrolyte in the tank 1 can form a stable and uniform upward laminar flow. Heater 6 can precisely control the temperature rise and constant temperature of the electrolyte, making the electroplating process more accurate and controllable.

[0022] After energization, the anode plate 2 undergoes an oxidation reaction, and metallic tin continuously dissolves and enters the electrolyte in ionic form. Under the influence of the electric field, the tin ions migrate to the cathode roller 3 and undergo a reduction reaction on the workpiece on the surface of the cathode roller 3, forming a metallic tin plating layer. It can be seen that through this low-porosity nanoscale bright tin plating layer electroplating tank structure, it is possible to ensure that the flow rate, temperature, and ion concentration of the electrolyte are highly consistent throughout the cathode roller 3 surface, effectively eliminating the difference in tin plating layer thickness caused by uneven fluid distribution. This is beneficial for forming a low-porosity nanoscale bright tin plating layer, thereby improving the electroplating quality of the workpiece.

[0023] The tank 1 has a distribution plate 10 at its bottom, with distribution holes that mate with the injection holes 9. A third chamber is formed between the distribution plate 10 and the bottom plate of the tank 1. By using the distribution plate 10, the electrolyte is first injected into the third chamber through the injection holes 9, and then flows upward in a stable and uniform laminar flow through the distribution holes on the distribution plate 10. This improves the uniformity of the electrolyte laminar flow, resulting in a more uniform tin plating layer on the workpiece. Furthermore, the uniform flow field generated by the distribution plate 10 can promptly replenish metal ions near the cathode roller 3, reducing metal ion concentration polarization, and simultaneously carrying away hydrogen gas evolved from the cathode roller 3, significantly reducing the porosity of the tin plating layer.

[0024] The inner wall of tank 1 is equipped with a pH sensor 8. By setting up the pH sensor 8, the acidity or alkalinity of the electrolyte in tank 1 can be monitored in real time, providing data support for process stability.

[0025] The cathode roller 3 is mounted on the tank 1 via an insulating sleeve 11. By setting the insulating sleeve 11, the cathode roller 3 and the tank 1 can be effectively electrically isolated, ensuring the uniformity of current distribution within the tank 1 and operational safety.

[0026] The cathode roller 3 is cylindrical, and the insulating sleeve 11 has mounting holes for mates with the cathode roller 3. By providing mounting holes, the connection between the cathode roller 3 and the insulating sleeve 11 is made more secure.

[0027] The inlet pipe 7 includes a first branch pipe, a second branch pipe, and a third branch pipe, each with a spray hole 9. By setting the first, second, and third branch pipes, the electrolyte flows uniformly in the third chamber, which helps the distribution plate 10 to form a stable and uniform upward laminar flow.

[0028] The outer surface of the tank 1 is provided with multiple annular protrusions at intervals. By providing annular protrusions on the outer surface of the tank 1, the area of ​​the outer surface of the tank 1 can be increased, which is beneficial to the heat dissipation of the tank 1.

[0029] The heater 6 has a continuously bent multi-U-shaped structure. By setting the heater 6 to a continuously bent multi-U-shaped structure, the electrolyte in the heater 6 can be heated better, which is beneficial for constant temperature control of the electrolyte.

[0030] The low-porosity nanoscale bright tin plating tank structure of this invention provides a uniform and stable electrolyte flow field during workpiece electroplating, which promotes the refinement of plating grains, thereby obtaining a tin plating layer with a nanocrystalline structure. This tin plating layer has the characteristics of low porosity, high corrosion resistance and high gloss.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A low-porosity nanoscale bright tin plating bath structure, characterized in that, Includes tank, anode plate, cathode roller, electrolyte circulation pump, outlet pipe, heater and inlet pipe; The tank is filled with an electrolyte. The anode plate and the cathode roller are respectively disposed on both sides of the tank. The anode plate is connected to the positive terminal of the power supply, and the cathode roller is connected to the negative terminal of the power supply. The cathode roller is used to fix the workpiece. One end of the outlet pipe extends into the tank, and the other end of the outlet pipe is connected to the first end of the electrolyte circulation pump. One end of the heater is connected to the second end of the electrolyte circulation pump, and the other end of the heater is connected to the third end of the electrolyte circulation pump. One end of the inlet pipe is connected to the fourth end of the electrolyte circulation pump, and the other end of the inlet pipe is provided with a spray hole. The electrolyte circulation pump includes a first chamber and a second chamber. The first chamber is connected to the first end and the second end, respectively, and the second chamber is connected to the third end and the fourth end, respectively.

2. The low-porosity nanoscale bright tin plating tank structure according to claim 1, characterized in that, A distribution plate is provided at the bottom of the tank, and the distribution plate is provided with distribution holes that cooperate with the injection holes. A third chamber is formed between the distribution plate and the bottom plate of the tank.

3. The low-porosity nanoscale bright tin plating tank structure according to claim 1, characterized in that, A pH sensor is installed on the inner wall of the tank.

4. The low-porosity nanoscale bright tin plating tank structure according to claim 1, characterized in that, The cathode roller is mounted on the tank via an insulating sleeve.

5. The low-porosity nanoscale bright tin plating tank structure according to claim 4, characterized in that, The cathode roller is cylindrical, and the insulating sleeve has mounting holes that mate with the cathode roller.

6. The low-porosity nanoscale bright tin plating tank structure according to claim 1, characterized in that, The liquid inlet pipe includes a first branch pipe, a second branch pipe, and a third branch pipe, and each of the first branch pipe, the second branch pipe, and the third branch pipe is provided with a spray hole.

7. The low-porosity nanoscale bright tin plating tank structure according to claim 1, characterized in that, The outer surface of the groove is provided with multiple annular protrusions at intervals.

8. The low-porosity nanoscale bright tin plating tank structure according to claim 1, characterized in that, The heater has a multi-U-shaped structure with continuous bends.

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