JPS5841359B2 - Submerged treatment method for metal wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating a metal wire using various treatment liquids, and more specifically to a method for electroplating or electrolytically treating a metal wire.

When a workpiece is immersed in a liquid and subjected to various treatments, for example, for electroplating, the workpiece is immersed in a plating solution with the electrode as an electrode and a metal plate as an anode, and metal ions are applied to the surface of the workpiece. Although this is done by precipitation, cations are depleted near the surface of the workpiece, creating a so-called concentration gradient.

Therefore, if a sufficient amount of cations are not supplied at all times, deposition becomes difficult and current efficiency decreases, and the deposition condition also becomes locally uneven, resulting in so-called plating discoloration, which results in poor plating.

To prevent this, it is common practice to vigorously agitate the plating stream to increase the relative movement between the workpiece and the plating solution, thereby constantly supplying a complete plating solution to the plating surface.

For example, when applying electroplating to a metal wire such as a wire as shown in FIG. 5 is arranged, and compressed air or plating liquid is ejected from the upper injection hole provided in this pipe 5 to perform air agitation or jet agitation.

In this way, in order to increase the relative movement between the plating solution and the metal wire, conventionally the plating solution is stirred and flowed.

However, when the plating solution is stirred by air, the plating factory is likely to be filled with mist of the plating solution, which poses a sanitary problem.Also, when the plating solution is stirred by jet stream, the piping system gets clogged due to sludge in the plating solution. Furthermore, it is technically quite difficult to apply an air blow or jet flow uniformly or at a desired position or in a desired manner within the plating tank due to the piping system and pressure loss.

This invention was made in view of the above-mentioned problems, and the processing efficiency is improved by applying vibration to the metal wire immersed in the processing solution to increase the relative movement with the solution. The purpose is to provide a treatment method that improves the quality of water and eliminates mist and piping troubles.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 4.

The drawing shows an example of electroplating a metal wire such as a wire, in which an anode metal plate 3 and a cathode metal wire 4 are immersed in a plating solution 2 in a plating bath 1.

The metal wire 4 passes through the plating tank 1 and is supported by rolls of electrodes 6 serving as supports outside both sides of the plating tank 1.

Inside the plating tank 1 where the electrode 6 is placed between the rolls,
An alternating magnetic field generator 7 is provided at the abdomen of the hard vibrations generated in the metal wire 4, and an alternating magnetic field with a frequency equal to the natural frequency is applied to give high frequency vibration to the metal wire 4.

The metal wire 4 vibrates in the plating solution 2 due to the alternating magnetic field generated by the alternating magnetic field generator 7, and this vibration causes the metal wire 4 to vibrate.
The contact between the plating solution 2 and the plating solution 2 is increased, and a sufficient amount of plating solution is always supplied to the plating surface, so that a sufficient amount of cations can be supplied to the precipitation interface, and good plating can be performed.

In addition, when the metal wire 4 is paramagnetic, the plating current is applied to the metal wire 4 in the alternating magnetic flux in the vertical direction, with the center point of the two electrodes 6 as the boundary in FIG. The right side flows toward the right electrode 6.

At this time, according to Fleming's law, a horizontal force acts on the metal wire 4, and since the magnetic field is alternating, the force acts alternately on the left and right with the same period as that period, and the metal wire 4 is affected by the frequency and excitation. Although it varies depending on the position, a planar vibration state as shown in FIG. 4 is obtained.

Note that at this time, since currents flow in opposite directions with the center between the electrodes as a boundary, the alternating magnetic field generator 7 is provided with another alternating magnetic field generator having an opposite phase at a symmetrical position with respect to the center point. If you do so, you will get even more intense vibrations.

Furthermore, if the metal wire 4 is ferromagnetic, at the same time as the horizontal vibration as in the paramagnetic case, since it is ferromagnetic, the vertical vibration in FIG. 3 is excited at the same period due to magnetic attraction. Therefore, the metal wire 4 is given a three-dimensional vibration that is a combination of horizontal and vertical vibrations.

In addition, although the example shows the case where it is used for electroplating of metal wire, it is not limited to this kind of use.For example, it can be used for pickling as a pre-treatment for electroplating, dissolving treatment for an anode or cathode, and plating. can be used when a liquid is used, such as reverse electrolytic treatment and the water washing step of each of the above-mentioned treatments.

Further, conventionally used air agitation or jet agitation means may be used in combination, and further effects can be obtained.

As described above, according to the method of the present invention, the metal wire immersed in the processing liquid is vibrated by an alternating magnetic field generator, so that the metal wire vibrates in the processing liquid and does not come into contact with the processing liquid. This increases the effectiveness of treatments such as plating and electrolysis.

In addition, since the vibration is applied by an alternating magnetic field generator, there is no mist or piping trouble, and uniform vibration can be applied even when multiple pipes are used at the same time, and the effect is always stable.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a conventional electroplating method, Fig. 2 is a longitudinal sectional front view showing an example in which the treatment method of the present invention is used for electroplating, Fig. 3 is a longitudinal sectional side view of the same, and Fig. 4 is It is a top view which shows the vibration state of a metal wire. 1...Plating tank, 2...Plating solution, 3
...Metal plate, 4...Metal wire, 6...
...electrode, 7...alternating magnetic field generator.

Claims (1)

[Claims] 1. While the metal wire immersed in the treatment liquid is supported by a support, an alternating magnetic field generator is placed at the midpoint of the natural vibration occurring in the metal wire, and the alternating magnetic field generator has a frequency equal to the natural vibration. A method for submerged processing of a metal wire, characterized by generating an alternating magnetic field of frequency to give vibration to the metal wire in a processing solution, and increasing relative movement between the metal wire and the processing solution by the vibration.