A new laboratory current distribution test device

Abstract

The utility model discloses a novel laboratory current distribution test equipment, including control box and setting in control box bottom for containing plating solution's beaker, the bottom of control box is provided with the annular titanium net for being used as electroplating anode through electric connection structure, and is provided with the copper bar for being used as electroplating cathode through rotary joint structure, the top of control box is equipped with the motor of copper bar positive and negative rotation that can drive, install in control box and allow the sliding contact conductive structure of rectifier electric connection when copper bar rotation, the utility model discloses through the design of integration, miniaturization, and the plating solution containing carrier is optimized to two liters beaker, only needs two liters plating solution to complete test, can reduce experimental raw material loss, and the compact structure of miniaturization after experimental equipment, light and handy, be convenient for laboratory internal handling, deposit, also can according to test demand flexible adjustment and place position, can improve the flexibility of equipment use.

Description

Technical Field

[0001] This utility model relates to the field of laboratory testing technology for the performance of electroplating solutions, specifically a novel laboratory current distribution testing device. Background Technology

[0002] The development and pre-production validation of electroplating solutions require a series of laboratory tests. Using rotating equipment to test the current distribution and the influence of each component on electroplating is one effective method.

[0003] The experimental principle of this method is to use a plating bath as a carrier, place the anode and the workpiece in the bath, form a closed conductive circuit through an industrial rectifier, and use electrolysis to deposit metal ions in the plating bath on the surface of the workpiece. After testing, observe the plating layer of the cathode of the copper rod sample. By measuring the plating layer thickness distribution, observing the appearance gloss and density of the plating layer, and detecting the plating adhesion and hardness, the purpose of reverse inferring the current distribution state can be achieved.

[0004] Currently, this experiment is mainly conducted on production equipment, which is quite large and generally requires 5 to 10 liters of plating solution, resulting in a waste of plating solution materials and making it inconvenient to move the equipment back and forth for testing. Utility Model Content

[0005] The purpose of this invention is to provide a novel laboratory current distribution testing device. By setting up an integrated device specifically for current distribution experiments, the amount of plating solution is reduced to two liters, reducing waste of plating solution materials. At the same time, the smaller device is convenient to move and use.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel laboratory current distribution testing device, comprising a control box and a beaker disposed at the bottom of the control box for holding plating solution. The bottom of the control box is provided with an annular titanium mesh for serving as an electroplating anode via an electrical connection structure, and a copper rod for serving as an electroplating cathode via a rotary connection structure. The top of the control box is equipped with a motor capable of driving the copper rod to rotate in both directions. The control box contains a sliding contact conductive structure that allows the copper rod to be electrically connected to a rectifier when rotating. The outer wall of the control box has wire holes for connecting the sliding contact conductive structure to an external rectifier.

[0007] Preferably, the electrical connection structure includes a plurality of titanium rods, the top of which penetrates the control box and is fixedly connected to the control box by screws, the bottom of which is fixedly connected to the top of the annular titanium mesh, and the tops of the plurality of titanium rods are electrically connected to the anode of the rectifier by wires.

[0008] Preferably, the rotary connection structure includes a sample connector, the top end of the copper rod is fixed inside the sample connector by a fixing structure, the output end of the motor is fixed with a conductive spindle, and the bottom end of the spindle is fixedly connected to the sample connector.

[0009] Preferably, the fixing structure includes an insertion hole at the bottom of the sample connector, the copper rod is inserted into the insertion hole, and a bolt is threaded onto the outer wall of the sample connector, one end of the bolt being screwed into the insertion hole and abutting against the outer wall of the copper rod.

[0010] Preferably, the sliding contact conductive structure includes a copper brush, a mounting block is fixed inside the control box, one end of the copper brush is fixed inside the mounting block, the fixed end of the copper brush is electrically connected to the cathode of the rectifier through a wire, and the other end of the copper brush is in contact with the surface of the spindle.

[0011] Preferably, the lower surface of the control box has a groove that can limit the movement of the beaker, and the inner diameter of the groove is the same as the outer diameter of the beaker.

[0012] Preferably, a PP insulating fixing block is fixed to the outer wall of the sample connector, and a PP insulating cover is threadedly connected to the PP insulating fixing block.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model optimizes the plating solution container into a two-liter beaker through integrated and miniaturized design, requiring only two liters of plating solution to complete the test, which can reduce the loss of experimental materials; moreover, the miniaturized experimental equipment has a compact structure and is lightweight, making it easy to transport and store in the laboratory, and its placement can be flexibly adjusted according to the testing needs, which can improve the flexibility of equipment use.

[0015] 2. The rotary connection structure of this utility model enables the rapid assembly and disassembly and secure fixation of the copper rod by setting sample connectors, insertion holes and bolts. At the same time, the motor can adjust the forward and reverse rotation direction and speed, which can simulate the influence of different rotation conditions on the current distribution, making the test scenarios more comprehensive. Attached Figure Description

[0016] Figure 1 This is an isometric drawing of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the control box of this utility model;

[0018] Figure 3 This is a schematic diagram of the sliding contact conductive structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the bottom of the control box of this utility model.

[0020] In the diagram: 1. Control box; 2. Beaker; 3. Electrical connection structure; 4. Annular titanium mesh; 5. Rotary connection structure; 6. Copper rod; 7. Motor; 8. Sliding contact conductive structure; 9. Wire hole;

[0021] 301, Titanium rod; 501, Sample connector; 502, Spindle; 503, Insertion hole; 504, Bolt;

[0022] 801. Copper brush; 802. Mounting block;

[0023] 10. Groove; 11. PP insulating fixing block; 12. PP insulating cover. 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-4 This utility model provides a technical solution: a novel laboratory current distribution testing device, including a control box 1 and a beaker 2 at the bottom of the control box 1 for holding plating solution. The beaker 2 has a capacity of two liters. The plating solution to be tested is poured into the beaker 2. If the temperature of the plating solution needs to be controlled, a water bath heating device can be used to control the plating solution in the beaker 2 within the required temperature control range. The bottom of the control box 1 is provided with an annular titanium mesh 4 for use as the electroplating anode through an electrical connection structure 3, and a copper rod 6 for use as the electroplating cathode through a rotary connection structure 5. The surface of the annular titanium mesh 4 is plated with 2.5 μm Pt and is set in an annular shape to facilitate the placement of the copper rod 6 into the annular titanium mesh 4. The top of the control box 1 is equipped with a motor 7 that can drive the copper rod 6 to rotate in both directions. The motor 7 can be controlled by a switch to rotate in both directions and the speed can be controlled by adjusting the frequency. The control box 1 is equipped with a sliding contact conductive structure 8 that allows the copper rod 6 to be electrically connected to the rectifier when rotating. The outer wall of the control box 1 is provided with a wire hole 9 for connecting the sliding contact conductive structure 8 to an external rectifier. The rectifier is connected by a wire hole 9.

[0026] The annular titanium mesh 4 is connected to the circuit through the electrical connection structure 3 and serves as the anode of the electroplating reaction. Platinum plating on its surface can enhance conductivity and corrosion resistance and prevent it from participating in the reaction. The copper rod 6 is fixed through the rotating connection structure 5 and serves as the cathode. The annular structure can keep the copper rod 6 surrounded by the anode, ensuring that metal ions are uniformly deposited onto the cathode during the electroplating process.

[0027] The motor 7 outputs power, which drives the copper rod 6 to rotate through the transmission structure; the switch controls the on and off of the forward and reverse circuit of the motor 7, realizing the switching of the rotation direction of the copper rod 6; adjusting the frequency of the current input to the motor 7 can change the speed of the motor 7, thereby controlling the rotation speed of the copper rod 6.

[0028] The electrical connection structure 3 includes a plurality of titanium rods 301, such as Figure 3 As shown, taking three titanium rods 301 as an example, the titanium rods 301 serve both fixing and conductive functions. The three titanium rods 301 fix the annular titanium mesh 4 to the bottom of the control box 1. The top of each titanium rod 301 penetrates the control box 1 and is fixedly connected to it by screws. The bottom of each titanium rod 301 is fixedly connected to the top of the annular titanium mesh 4. The tops of several titanium rods 301 are electrically connected to the anode of the rectifier via wires. The tops of the three titanium rods 301 are connected together by wires and then connected to the anode of the rectifier.

[0029] The rotary connection structure 5 includes a sample connector 501. The top end of the copper rod 6 is fixed inside the sample connector 501 by a fixing structure. A conductive spindle 502 is fixed to the output end of the motor 7. The spindle 502 is made of 316L stainless steel, and the size of the upper end of the spindle 502 matches the size of the motor 7. It is fixed to the bearings of the motor 7 by screws on both sides. The bottom end of the spindle 502 is fixedly connected to the sample connector 501. The cathode sample is a copper rod 6. Before testing, the copper rod 6 needs to undergo pretreatment to clean the oxide layer on its surface. The size of the copper rod 6 matches the insertion hole 503 of the sample connector 501.

[0030] The main shaft 502 serves both as a power transmission and electrical conductor. One end is fixed to the bearing of the motor 7, transmitting the rotational power of the motor 7 to the sample connector 501, which in turn drives the copper rod 6 to rotate. The other end is connected to the sample connector 501, through which current is conducted to the copper rod 6.

[0031] The fixing structure includes an insertion hole 503 at the bottom of the sample connector 501, into which the copper rod 6 is inserted. A bolt 504 is threaded onto the outer wall of the sample connector 501, with one end of the bolt 504 screwed into the insertion hole 503 and abutting against the outer wall of the copper rod 6. A central hole is formed in the outer wall of the sample connector 501, into which the bolt 504 is screwed, with the bottom end of the bolt abutting against the outer wall of the copper rod 6, thus fixing the copper rod 6.

[0032] The sliding contact conductive structure 8 includes a copper brush 801. A mounting block 802 is fixed inside the control box 1. One end of the copper brush 801 is fixed inside the mounting block 802. The fixed end of the copper brush 801 is electrically connected to the cathode of the rectifier through a wire. The other end of the copper brush 801 is in contact with the surface of the spindle 502.

[0033] The sliding contact conductive structure 8 maintains a continuous conductive state with the circuit during the rotation of the copper rod 6, ensuring continuous power supply to the cathode circuit. The mounting block 802 provides fixed support for the copper brush 801. The fixed end of the copper brush 801 is connected to the rectifier cathode through a wire, and the other end maintains sliding contact with the surface of the rotating spindle 502. During the rotation of the spindle 502, the copper brush 801 and the spindle 502 maintain a continuous conductive connection, transmitting the cathode current output by the rectifier to the copper rod 6 through the spindle 502 and the sample connector 501, thus solving the problem of continuous conduction of the cathode circuit when the copper rod 6 rotates.

[0034] The lower surface of the control box 1 has a groove 10 that limits the position of the beaker 2. The inner diameter of the groove 10 is the same as the outer diameter of the beaker 2. The control box 1 is made of PP material. The groove 10 ensures that the rotating device is centered in the beaker 2. The center of the lower surface of the control box 1 is a rotating shaft that connects to the sample connector 501. The sample connector 501 is fixed inside the rotating shaft. The rotating shaft and the control box 1 are rotatably connected by bearings. The rotating shaft is made of 316L stainless steel.

[0035] A PP insulating fixing block 11 is fixed to the outer wall of the sample connector 501. The PP insulating fixing block 11 is threadedly connected to a PP insulating cover 12. The PP insulating fixing block 11 provides a mounting platform for the PP insulating cover 12. The insulating cover covers the outside of the sample connector 501 and its connection part, blocking the conductive path between this area and the outside, and avoiding leakage or accidental electric shock.

[0036] During the experiment, the copper rod 6 cathode underwent pretreatment to clean the surface oxide layer and ensure conductivity.

[0037] Pour the required plating solution into a two-liter beaker 2. If temperature control is required, place beaker 2 in a water bath heating device and adjust it to the experimental set temperature.

[0038] Insert the copper rod 6 into the insertion hole 503 of the sample connector 501, and rotate the bolt 504 to tighten the copper rod 6, thus completing the cathode fixing;

[0039] Insert beaker 2 into groove 10 on the lower surface of control box 1 to ensure that beaker 2 is fixed in position. At this time, copper rod 6 and annular titanium mesh 4 are both immersed in plating solution.

[0040] The top of the titanium rod 301 connected to the ring titanium mesh 4 is connected in parallel with wires and then connected to the anode of the external rectifier through the wire hole 9 on the outer wall of the control box 1; the fixed end of the copper brush 801 is connected to the cathode of the external rectifier through wires and wire hole 9.

[0041] The copper rod 6 can be rotated forward or backward by switching the motor 7, and the current frequency of the input motor 7 can be adjusted to set the required rotation speed. The motor 7 drives the spindle 502 to rotate, which drives the sample connector 501 and the copper rod 6 to rotate synchronously. The copper brush 801 always maintains conductive contact with the spindle 502 during the rotation of the copper rod 6.

[0042] The rectifier is started and a stable current is output. The current is transmitted to the ring titanium mesh 4 through the anode circuit, forms an electrolytic circuit through the plating solution, and then flows back to the rectifier through the cathode circuit composed of copper rod 6, sample connector 501, main shaft 502, and copper brush 801 to complete the electroplating reaction.

[0043] Subsequent tests were performed on copper rod 6, such as measuring the coating thickness distribution, observing the coating's gloss and density, and testing the coating's adhesion and hardness. These indicators were used to infer the current distribution.

[0044] When the current density is moderate and uniform, the metal ions crystallize finely and are tightly packed, resulting in a smooth coating surface with good gloss and no obvious defects. When the current density is too high, the deposition rate is too fast, the metal ion crystals are disordered and the porosity is high, and the coating may have problems such as roughness, dullness, and burning. When the current density is too low, the deposition rate is slow, the crystallization is easily affected by impurities, and the coating may have defects such as fogging, mottled appearance, and pinholes.

[0045] If the current distribution is stable and uniform, the metal ions can form a strong metallurgical bond or physical adsorption with the copper rod 6 substrate, resulting in strong adhesion. If the current distribution fluctuates greatly or the local current is too large, a loose transition layer is easily formed between the deposited layer and the substrate, leading to a decrease in adhesion and peeling or detachment.

[0046] Therefore, if the coating has uniform thickness, good gloss, strong adhesion, and uniform hardness, the current distribution will be uniform and stable, and the experimental parameters will be suitable.

[0047] If the coating thickness is thin at both ends and thick in the middle, the coating in the middle is rough and burnt, and the hardness in the middle is low, then the current is concentrated in the middle of the copper rod 6, which may be due to the liquid flow speed in the middle being too fast during rotation.

[0048] If the coating is thin, foggy, or has poor adhesion, the overall current density is too low, or the uneven current distribution leads to insufficient local deposition. In this case, the rectifier output current needs to be adjusted or the electrode layout needs to be optimized. The current distribution test results obtained from this are helpful for adjusting production parameters.

[0049] 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 novel laboratory current distribution testing device, characterized in that: The control box (1) includes a control box (1) and a beaker (2) for holding plating solution at the bottom of the control box (1). The bottom of the control box (1) is provided with an annular titanium mesh (4) for electroplating anode via an electrical connection structure (3) and a copper rod (6) for electroplating cathode via a rotary connection structure (5). The top of the control box (1) is equipped with a motor (7) that can drive the copper rod (6) to rotate in both directions. The control box (1) is equipped with a sliding contact conductive structure (8) that allows the copper rod (6) to be electrically connected to the rectifier when it rotates. The outer wall of the control box (1) is provided with a wire hole (9) for connecting the sliding contact conductive structure (8) to the external rectifier.

2. The novel laboratory current distribution testing device according to claim 1, characterized in that: The electrical connection structure (3) includes several titanium rods (301). The top of the titanium rods (301) passes through the control box (1) and is fixedly connected to the control box (1) by screws. The bottom of the titanium rods (301) is fixedly connected to the top of the annular titanium mesh (4). The tops of the several titanium rods (301) are electrically connected to the anode of the rectifier by wires.

3. The novel laboratory current distribution testing device according to claim 2, characterized in that: The rotary connection structure (5) includes a sample connector (501), the top end of the copper rod (6) is fixed inside the sample connector (501) by a fixing structure, and the output end of the motor (7) is fixed with a conductive spindle (502), the bottom end of the spindle (502) is fixedly connected to the sample connector (501).

4. The novel laboratory current distribution testing device according to claim 3, characterized in that: The fixing structure includes an insertion hole (503) at the bottom of the sample connector (501), the copper rod (6) is inserted into the insertion hole (503), and the outer wall of the sample connector (501) is threaded with a bolt (504), one end of the bolt (504) is screwed into the insertion hole (503) and abuts against the outer wall of the copper rod (6).

5. A novel laboratory current distribution testing device according to claim 4, characterized in that: The sliding contact conductive structure (8) includes a copper brush (801), and a mounting block (802) is fixed inside the control box (1). One end of the copper brush (801) is fixed inside the mounting block (802), and the fixed end of the copper brush (801) is electrically connected to the cathode of the rectifier through a wire. The other end of the copper brush (801) is in contact with the surface of the spindle (502).

6. The novel laboratory current distribution testing device according to claim 1, characterized in that: The lower surface of the control box (1) is provided with a groove (10) that can limit the beaker (2), and the inner diameter of the groove (10) is the same as the outer diameter of the beaker (2).

7. A novel laboratory current distribution testing device according to claim 3, characterized in that: The outer wall of the sample connector (501) is fixed with a PP insulating fixing block (11), and the PP insulating fixing block (11) is threadedly connected with a PP insulating cover (12).

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