JPH048359Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] Industrial Field of Use The present invention relates to an apparatus for measuring the local current density of a surface to be treated which is subjected to an electrolytic treatment such as electroplating.

Prior Art When performing electrolytic treatments such as electroplating and electrolytic polishing, it is essential to adjust the current density of the surface to be treated within an appropriate range in order to obtain a good electrolytically treated surface. In order to know the current density in such electrolytic treatment, there is a method of calculating it from the area of the surface to be treated and the total current value. There is a problem in that the current is concentrated and only a small amount of current flows to the recesses or the back surface, so it is not possible to obtain a good electrolytically treated surface just by knowing the average current density as described above.

Therefore, when performing electrolytic treatment, it would be possible to know the local current density at different locations on the contact surface between the conductor to be treated and the electrolytic bath.
This should make it possible to perform electrolytic treatment efficiently and with excellent results by adjusting the electrolytic treatment conditions, the shape of the counter electrode, the relative positional relationship with the counter electrode, etc. However, even if there is a laboratory measurement method for determining the local current density of a liquid-contacted surface, the reality is that there is still no measurement method that can be used in industrial operations. Ta.

On the other hand, one of the inventors of the present invention proposed a method in which a pair of bipolar electrodes is placed close to the surface in contact with the liquid to detect the potential gradient in the electrolyte, and thereby measure the current density on the surface in contact with the liquid. He discovered that the method is industrially practical, invented a current density measuring device based on this principle, and has filed a separate patent application.

Problems to be Solved When implementing the current density measurement method based on the above-mentioned principle industrially, in order to obtain accurate and reproducible measurement values, the current density measurement sensor must be It is necessary to be accurately fixed at the measurement target position. That is, it is important to install the current density measuring sensor in an accurate direction and at an accurate distance from an accurate position on the liquid contact surface of the conductor to be measured.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a fixture for accurately and reproducibly installing a sensor for measuring the current density of a surface in contact with a conductor to a conductor to be measured.

[Structure of the idea]

Means for Solving the Problems The object of the present invention as described above is to provide an insulating ring body through which a sensor can be inserted, and a fixing means through which the ring body can be fixed to the inserted sensor. , and an insulating positioning means connected to the annular body and capable of regulating the relative position of the object to be measured with respect to the liquid-contacted surface. achieved by.

When the length of the positioning means in the present invention can be adjusted, the position of the electrode can be changed arbitrarily, so it is possible to measure the current density at any position on the liquid contact surface one after another. It is particularly convenient for

Embodiment An example of a fixture for a sensor for measuring current density on a surface in contact with a conductor according to the present invention will be described with reference to FIG.

Reference numeral 1 designates a current density measuring sensor, in which a pair of needle-like electrodes 1b, 1b are planted at a distance of, for example, 5 mm at the tip of a cylindrical portion 1a made of an insulating material such as Teflon. These electrodes 1
b and 1b are connected to the ends of a pair of insulated wires drawn out through the inside of the cylindrical part 1a, and the potential difference generated by the electrolytic current in the electrolytic solution is connected to a separately installed amplifier. It is designed to be input, detected and measured by an external output display device.

2 is a conductor to be measured, such as a metal plate to be plated. The conductor 2 is immersed in an electrolytic bath, and plating etc. are performed by applying electricity, but since a current flows in the electrolytic bath near the surface in contact with the liquid at a density approximately equal to the current density on the surface in contact with the liquid, A potential gradient approximately proportional to the current density is generated. Therefore, by measuring the potential difference at each location on the liquid-contacted surface at a position a certain distance from the liquid-contacted surface in the electrolytic bath, the current density at each location can be determined.

Reference numeral 3 denotes a fixture, which includes an annular body 3a that is inserted through the cylindrical portion 1a of the sensor, and contact fingers 3b that are connected to the annular body 3a and extend laterally. As means for fixing the ring body 3a to the cylindrical portion 1a, a set screw 3c is screwed into a threaded hole in the side surface of the ring body 3a.

4 is another fixture, which is the cylindrical part 1 of the sensor.
The arm body 4a is provided with a ring body 4a that is inserted through the ring body 4a, and an arm body 4b that is connected to the ring body 4a and extends laterally.
A positioning means 4' having a structure similar to that of the fixture 3, that is, a ring body 4d, a contact finger 4e, and a set screw 4f, is attached to b.
Further, as means for fixing the ring body 4a to the cylindrical portion 1a, a set screw 4 screwed into a screw hole of the ring body 4a is used.
c is used.

Function: Attach the necessary number of such fixing devices to appropriate parts of the current density measurement sensor, for example, attach contact fingers 3b, 4e to the edges 2a, 2b of the conductor 2, etc.
If the sensor 1 is positioned so that the electrodes 1b, 1b are brought into contact with each other, the electrodes 1b, 1b will automatically come to the expected positions accurately, allowing measurement with less error.

[Effect of idea]

The fixing device of the sensor for measuring current density on the surface of a conductor in contact with liquid according to the present invention can be fixed at an appropriate position on the cylindrical part of the sensor, and the relative position of the conductor to be measured with respect to the surface in contact with liquid can be arbitrarily set. Therefore, when tracking changes in current density over time, it is possible to position the electrode at the same location with good reproducibility, and it is also possible to create a map by measuring the current density at various locations on the wetted surface. In this case, since the measurement position can be specified accurately, there is an advantage that highly reliable measurement can be performed with easy operation.

[Brief explanation of the drawing]

The figure is a perspective view illustrating a state in which the fixing device of the present invention is attached to a sensor for measuring current density on a surface in contact with a conductor and fixed to the surface in contact with a liquid. 1...sensor, 2...conductor, 3, 4...fixing tool.

Claims (1)

[Claims for Utility Model Registration] (1) An insulating ring body into which a sensor can be inserted, a fixing means that can fix the ring body to the inserted sensor, and a means connected to the ring body. A fixing device for a sensor for measuring current density of a surface of a conductor in contact with a liquid, comprising an insulating positioning means capable of regulating the relative position of the object to be measured relative to the surface of the object in contact with the liquid. (2) Utility model registration claim 1, in which the positioning means is configured such that its length can be adjusted.
Fixtures listed in section. (3) The fixture according to claim 1 or 2, wherein the positioning means includes insulating contact fingers.