Hull cell test piece for testing leveling performance

Abstract

The utility model provides a Hull cell test piece for testing leveling performance, and belongs to the technical field of electroplating liquid leveling performance testing, the Hull cell test piece is used as an electroplating cathode, the Hull cell test piece comprises a front surface in a bright state and a back surface which is in a semi-bright state and is subjected to insulation treatment, the front surface of the Hull cell test piece is provided with 1-10 grooves, and the back surface of the Hull cell test piece is provided with 1-10 grooves. The groove transversely penetrates through the two ends of the Hull groove test piece, the depth of the groove is 10-30 microns, and the width of the groove is 80-120 microns. Compared with the prior art, the device has the advantages that an existing test piece needing to be manually polished is replaced, and in addition, when the test piece of the Hell groove is observed, the test piece does not need to be cut, nondestructive testing can be realized, and resource waste is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of electroplating solution leveling performance testing, in particular to a Hull cell test piece for testing the leveling performance. Background Art

[0002] With the rapid development of the PCB and microelectronics industries, traditional electroplating technology is no longer suitable for high-precision electronic devices. Introducing more advanced electroplating technologies or developing high-performance electroplating solutions has become a research hotspot. Among them, the leveling ability of the electroplating solution is one of the important indicators for evaluating the performance of the electroplating solution.

[0003] In the prior art, in order to test the leveling ability of electroplating solutions and corresponding additives, a test piece polished with sandpaper of a fixed mesh size is generally used as the electroplating cathode. After electroplating, the test piece is removed and the leveling quality of the polished surface is observed. This method is greatly affected by human factors, has high uncertainty, and is prone to errors. In addition, a single test can generally only calculate the leveling rate at a single current density. When it is necessary to evaluate the leveling performance of electroplating solutions at different current densities, the test piece needs to be repeatedly polished. The entire test operation is cumbersome, with a high repetition rate and low efficiency. Moreover, when calculating the leveling rate of the electroplating solution, the test piece needs to be cross-sectioned, which can also cause loss or damage to the test piece. Utility Model Content

[0004] The utility model provides a Hull cell test piece for testing leveling performance, which is used to solve the problems existing in the prior art.

[0005] The purpose of this utility model is achieved by the following technical solutions:

[0006] A Hull cell test piece for testing leveling performance serves as an electroplating cathode. The Hull cell test piece includes a bright front surface and a semi-bright, insulating back surface. The front surface of the Hull cell test piece is provided with 1-10 grooves, which extend transversely through both ends of the Hull cell test piece. The grooves have a depth of 10-30 μm and a width of 80-120 μm.

[0007] Through the above technical solution, under normal circumstances, the front side of the Hull cell test piece is used to adsorb the anode metal ions in the electroplating process to form a coating, and a transverse groove with a depth of 10-30μm and a width of 80-120μm is opened in the Hull cell test piece. During the electroplating process, the solution exchange at the groove can be weakened. The stronger the metal ion diffusion ability of the electroplating mixed liquid, the better the filling effect of the groove. Using the above mechanism, the experimenters combined with the existing Hull cell current density scale can obtain the leveling rates of different current densities at different positions in the electroplating mixed liquid. Compared with the existing technology, the Hull cell test piece of the present invention is a standardized workpiece, which replaces the existing test piece that needs manual polishing. It can be mass-produced and used as a Hull cell cathode. Testing with the Hull cell test piece of the present invention can reduce human errors and meet the simultaneous testing of leveling ability and current density range in the electroplating solution performance test, solving the problem that a single test can only obtain the leveling ability under a single current density, simplifying the tedious steps of testing the leveling ability under different current densities, and, when observing the Hull cell test piece, there is no need to cut the test piece, which can achieve non-destructive testing and reduce resource waste.

[0008] Preferably, the front surface roughness of the Hull cell test piece is 0.08-0.12 μm.

[0009] Preferably, if there are two or more grooves, the plurality of grooves spaced apart from each other are parallel to each other.

[0010] Preferably, the distance between two adjacent grooves is 1-3 mm.

[0011] Preferably, the Hull cell test piece is a single-side polished pure copper sheet, brass sheet or iron sheet.

[0012] Preferably, the groove is a groove formed by laser engraving.

[0013] Compared with the prior art, the present invention has at least the following advantages:

[0014] The Hull cell test piece of the present invention is a standardized workpiece, which can be mass-produced and used as a Hull cell cathode. Testing with the Hull cell test piece of the present invention can reduce human errors, and can meet the simultaneous testing of leveling ability and current density range in the electroplating solution performance test, thereby solving the problem that only leveling ability under a single current density can be obtained in a single test, simplifying the tedious steps of testing leveling ability under different current densities, and, when observing the Hull cell test piece, there is no need to cut the test piece, thereby realizing non-destructive testing and reducing waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic structural diagram of a Hull cell test piece for testing leveling performance in an embodiment of the present invention;

[0017] Figure 2 for Figure 1 Cross-section of section A;

[0018] Figure 3 This is a microscope observation picture of a Hull cell test piece after electroplating for testing the leveling performance in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0021] This embodiment discloses a Hull cell test piece for testing leveling performance, which is used to solve the problems existing in the prior art.

[0022] Reference Figure 1 and Figure 2 , a Hull cell specimen for testing leveling performance, the Hull cell specimen is used as an electroplating cathode. In this embodiment, the Hull cell specimen is in the shape of a rectangular sheet as a whole and is easy to process. The front of the Hull cell specimen is used to adsorb metal ions from the anode during the electroplating process to form a coating. The front of the Hull cell specimen is polished to a bright state for easy microscopic observation. The back of the Hull cell specimen is semi-bright and is insulated to avoid the formation of a coating on the back. The front of the Hull cell specimen is provided with 1-10 grooves, which run horizontally through both ends of the Hull cell specimen.

[0023] Specifically, the depth of the groove is 10-30μm and the width is 80-120μm. The groove cannot be made by hand, but needs to be obtained by laser engraving. During laser finishing, the laser energy speed needs to be set to 800-1200mm / s, the power is 5W-10W, the frequency is 25-35kHz, and the pulse width is 10ns.

[0024] Compared with the existing technology, the Hull cell test piece of the present invention uses laser technology to open a transverse groove with a depth of 10-30μm and a width of 80-120μm on its front surface. This can make the solution exchange at the groove weaker during the electroplating process. The stronger the metal ion diffusion ability of the electroplating mixed liquid, the better the filling effect at the groove. By using this filling mechanism, it is easier for testers to combine the existing Hull cell current density scale to obtain the leveling rate of different current densities at different positions in the electroplating mixed liquid. The Hull cell test piece of the present invention is a standardized workpiece that can be mass-produced through laser engraving technology. It is almost impossible for errors caused by human processing to occur. The Hull cell test piece can meet the simultaneous testing of leveling ability and current density range in the electroplating solution performance test, solving the problem that a single test can only obtain the leveling ability at a single current density, simplifying the tedious steps of testing the leveling ability at different current densities, and when observing the Hull cell test piece, there is no need to cut the test piece, which can achieve non-destructive testing and reduce resource waste.

[0025] Preferably, the front surface roughness of the Hull cell test piece is 0.1 μm.

[0026] Through the above technical solution, the rough front groove has the best effect of depositing anode metal ions, which is beneficial to the observation of the Hull cell specimen after electroplating.

[0027] like Figure 2 As shown, if there are two or more grooves, the grooves are spaced apart and parallel to each other, and the spacing between two adjacent grooves is 1-3 mm, which is selected according to the properties of the electroplating mixture to be tested. In this embodiment, the material of the Hull cell test piece can be a single-sided polished pure copper sheet, brass sheet, or iron sheet, which is selected according to the electroplating mixture to be tested.

[0028] Through the above technical solution, if more than two grooves are set, the influence of accidental deviation of anode metal ion precipitation in a single groove can be reduced, thereby improving the accuracy of the calculation results of the electroplating leveling rate.

[0029] The specific method of testing the leveling performance of the utility model is as follows:

[0030] First, select the corresponding Hull cell specimen according to the type of electroplating liquid to be tested. After the Hull cell specimen is degreased and pre-activated, the Hull cell specimen is fixed vertically in the Hull cell as the cathode end. Then, fix the anode end of the Hull cell. Next, prepare the electroplating liquid to be tested and place it in the Hull cell, and then place the additive to be tested. The mixed liquid in the Hull cell is then aerated and stirred or mechanically stirred to fully mix the additive and the electroplating liquid. The mixed liquid in the Hull cell is then adjusted to a predetermined pH value and temperature. Power is applied to the cathode and anode ends for electroplating, and air is continuously pumped into the mixed liquid in the Hull cell to increase the electroplating rate. Finally, a 3D laser confocal microscope is used to observe the front of the Hull cell specimen, and the grooves of the Hull cell specimen are measured to calculate the corresponding flattening rate. The above formula for calculating the flattening rate is Where D is the original groove depth, and d is the actual groove depth after electroplating.

[0031] It should be explained that if the electroplating solution to be tested is an acid copper based electroplating solution, then this embodiment can use a Hull cell test piece with 1 laser engraved groove, which is made of polished brass sheet, with a groove width of 100 μm and a depth of 16 μm. Figure 3 The effect diagram shown.

[0032] Those skilled in the art can make various other corresponding changes and deformations based on the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the claims of the present utility model.

Claims

1. A Hull cell test piece for testing leveling performance, characterized in that: As an electroplating cathode, the Hull cell specimen includes a front side in a bright state and a back side in a semi-bright state and insulated. The front side of the Hull cell specimen is provided with 1-10 grooves, and the grooves run horizontally through both ends of the Hull cell specimen. The depth of the grooves is 10-30 μm, and the width of the grooves is 80-120 μm.

2. The Hull cell test piece for testing leveling performance according to claim 1, characterized in that: The front surface roughness of the Hull cell test piece is 0.08-0.12 μm.

3. The Hull cell test piece for testing leveling performance according to claim 1, characterized in that: If there are two or more grooves, the plurality of grooves spaced apart from each other are parallel to each other.

4. The Hull cell test piece for testing leveling performance according to claim 3, characterized in that: The distance between two adjacent grooves is 1-3 mm.

5. The Hull cell test piece for testing leveling performance according to claim 1, characterized in that: The Hull cell test piece is a pure copper sheet, brass sheet or iron sheet polished on one side.

6. The Hull cell test piece for testing leveling performance according to claim 1, characterized in that: The groove is formed by laser engraving.

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