JPS604267B2 - Particulate additive dispersion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for dispersing particulate additives, and in particular, the present invention relates to a device for dispersing particulate additives, in particular, dispersing particulate additives contained in a plating liquid for composite plating without using a dispersing agent such as a surfactant, and moreover, in the most effective manner. The present invention relates to a dispersion device that can disperse the water and has an extremely simple structure.

Composite plating, unlike haze plating, is a plating method in which a plating material is precipitated using a reducing agent contained in a plating solution to form a plating layer on the metal surface. It is applied to the surface treatment of mechanical parts that are prone to scratch corrosion, such as spline shafts for industrial use, and are subjected to high-speed heavy loads that involve sliding, and can significantly improve their self-lubricating properties and wear resistance. be.

The reason for this great feature is that particulate additives such as ceramics such as oxides and carbides or metals are dispersed and precipitated in the plating material. This particulate additive is
They are circular fine particles with a diameter of about 1 French, and provide high self-lubricating properties and wear resistance to the metal plating layer. In order to perform this type of plating, a fine particle additive of ceramic, for example, is mixed and dispersed in the plating liquid, and the object to be plated is immersed in the plating liquid for a predetermined period of time to form the plating material. and fine particle additives are precipitated to form a plating layer.

However, the particulate additives mixed in the plating solution tend to aggregate extremely easily due to their surface tension, and it is therefore technically quite difficult to uniformly disperse them in the plating solution.

Conventionally, for example, in the case of composite plating of nickel, a plating solution was prepared by mixing nickel sulfate (NiSQ) with ceramic (SIC) as a fine particle additive, and then adding sodium hypophosphite (NaH2P02) as a reducing agent mediator. A dispersant such as a surfactant is mixed with the plating solution to prevent the ceramic (SIC) from agglomerating and dispersed, and a device is used to constantly blow air into the plating solution tank. It was getting worse.

However, according to the above-mentioned conventional apparatus, the surfactant easily ages, the amount thereof is small, and in order to increase production efficiency, the temperature of the plating solution is raised to at least 60 degrees Celsius or higher, preferably around 90 degrees Celsius. Ceramic (SIC)
) becomes less effective, and the fine particles 1 aggregate in the plating liquid 3 of the plating pot 2, as shown in FIG. , the ceramic (SIC) fine particles 1 are partially unevenly distributed in an aggregated form, which has the disadvantage that a homogeneous composite plated layer cannot be obtained.

Moreover, if the amount of surfactant increases, the adhesion of plating deteriorates, so it was not possible to increase the amount too much. Furthermore, it is impossible to disperse the ceramic (SIC) fine particles 1 only by blowing air, and in any case, the use of a surfactant is unavoidable with conventional equipment.
There were many inconveniences. The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and its purpose is to change the fine particle additives, such as surfactants, to the plating solution for composite plating. The goal is to be able to completely and uniformly disperse the additive without using any dispersant, and by doing so, the evenly dispersed particulate additive can be deposited within the plating layer formed on the surface of the object to be plated. The objective is to obtain a composite plated layer with excellent self-lubricating properties and wear resistance.

Another object is to maintain good plating adhesion and to maintain a high temperature of the plating solution by not using a dispersant, thereby improving production efficiency. Still another purpose is to remove the precipitation of particulate additives by taking the plating solution from the bottom of the plating tank, dispersing the particulate additives outside the plating tank, and then returning the particulate additives to the top of the plating tank. The objective is to prevent this and enable the most efficient dispersion of particulate additives. In short, the present invention provides a composite plating apparatus that uses a plating solution containing fine particle additives such as oxides, carbides, metals, etc., in which an ultrasonic oscillator is provided at the bottom of a plating pot of the plating apparatus. A dispersion tank for additives is connected through a lotus connection, and the particulate additive is subjected to ultrasonic vibration in the dispersion tank to be dispersed in the plating liquid, and the plating liquid is returned to the plating tank. This device is characterized by being equipped with a liquid conveying means. The present invention will be explained below based on embodiments shown in the drawings.

In FIG. 2, a dispersion tank 4 contains additives such as oxides, carbides, metals, etc., mainly ceramic (SIC) fine particles 1, and subdust sodium phosphate (Na ratio P02) as a reducing agent.
A plating solution 3 made of nickel sulfate (NiS04) containing Ultrasonic vibrations higher than the dish HZ are transmitted to the liquid 3 and the fine particles 1 of ceramic (SIC).

Next, the specific arrangement of the dispersion tank 4 will be explained.
In the figure, a pipe 7 is connected to the bottom 6a of the plating tank 6, the pipe is connected to the dispersion tank 4 equipped with an ultrasonic oscillator 5 via a pump 8, and a hose 9 is connected to the dispersion tank. Connect the discharge port 4M of the hose, and connect one end 9a of the hose to the plated oak 6.
6b. That is, basically, the plating liquid 3 is sucked out from the bottom 6a of the plating pot 6 by the pump 8, and sent to the dispersion tank 4, where the plating liquid 3 is subjected to ultrasonic waves by the ultrasonic oscillator 5. The fine particles 1 are dispersed by applying vibration, and then the plating liquid is poured into the upper part 6b of the plating tank 6.
It is designed so that it can be returned by hose 9. However, when the device of the present invention is put into practice, other sieves or the like may be provided between the dispersion tank 4 and the plating tank 6. The system 11 will be explained with reference to FIGS. 4 to 7.

In FIG. 4, the plating liquid adjustment system 11 includes a plating pot 6 and a pipe 7 connected to the bottom 6a of the plating tank.
, the pump 8, one end of the pipe 7 is connected to the flask, and the one end is connected to the flask liquid recovery tank 12, which includes a fine particle additive dispersion liquid tank 13a and a sedimentation liquid tank 12b, and the sedimentation tank 12b, and one end is connected separately. The pipe 14 is connected to the precipitation tank 13 of
, a pump 15 provided in the middle of the pipe, and a settling tank 13
a dispersion tank 4 adjacent to and in communication with the dispersion tank, a pipe 16 connected to the dispersion tank through a connection, and an adjustment plating liquid tank 1 to which the pipe is connected through the connection.
7. A hose 9 for returning the plating liquid from the adjusted plating liquid tank to the plating tank 6, and a pump 1 installed in the middle of the hose.
8 is the main part, and in addition to these, there is an ultrasonic cleaning tank 1 for cleaning and recovering particulate additives attached to the coated object.
9. Dispersion liquid tank 19a and precipitation liquid tank 1 provided in the cleaning tank
9b, a pipe 20 connected to the precipitation liquid tank 19b and the precipitation liquid tank 13, and a pump 2 provided in the middle of the core pipe.
1. A pipe 23 is connected to the dispersion liquid tanks 12a and 19a and the pure water supply tank 22, and plating liquid supply tanks 24 and 25 are connected to the pure water supply tank and the adjustment plating liquid tank 17. be. In addition, 26 is a water washing tank, 27 is a hot water washing tank, 28 is a drying room,
29 is a rust prevention oil tank, and 30 is a plating liquid preliminary tank;
1 is a passivate liquid (HN03) tank.

Next, the structure of the plating bath 6 will be explained with reference to FIGS. 5 to 7. The side surfaces 6c and 6d of the plating bath 6 are provided with diaphragms 32 and 33 shown by broken lines in FIGS. 5 and 6. can be,
The plating liquid 3 from the hose 9 enters downward from the upper part 6b of the plating plate 6 between the side surfaces 6c, 6d and the respective diaphragms 32, 33 as shown by arrows 34, 35, and 36, and is heated. It is mixed into the plating liquid 3 in the plating pot 6 little by little.

Further, the bottom part 6a of the plating pot 6 is provided with V-shaped grooves 6e, 6e, 6e, as shown in FIGS. 6 and 7, and air pipes 37, 38, 39 are provided at the bottom of each groove. The air pipe has air outlet holes 3 facing downward at 45 degree intervals.
7a, 38a, and 39a are raised in large numbers in the longitudinal direction, and the air blows out downward as shown by arrow 40.
The particulate additive that settles at the bottom of each groove 6e, 6e, 6e is blown upward. The present invention is configured as described above, and its operation will be explained below.
In FIG. 3, unlike the conventional method, a dispersant such as a surfactant is not mixed in the plating solution 3 of the plating pot 6, so the ceramic (SIC) fine particles 1 aggregate and form the plating pot. However, the plating liquid 3 is sucked out from the bottom by the pump 8, sent to the dispersion tank 4, and ultrasonic vibration is applied from the ultrasonic oscillation feeder 5 to disperse the plating liquid 3. The fine particles 1 are dispersed in the tank, and after that, the fine particles 1 become a milky white plating liquid 3 in which the fine particles 1 do not easily aggregate, and are returned to the upper part 6b of the plating tank 6 by the hose 9. Therefore,
By repeating this circulation action, all of the plating liquid 3 becomes a milky white plating liquid 3 in which fine particles 1 are neatly dispersed, and the object to be plated 1 is immersed in the plating liquid.
0} This makes it possible to form a composite plated layer in which the ceramic (SIC) fine particles 1 are uniformly dispersed. For example, ``nickel sulfate (NiS04) is mixed with sodium hypophosphite (Na ratio P02) as a mediating substance as a reducing agent,
A plating solution for composite plating is made by adding fine particles of ceramic (SIC) with a diameter of about one peak, and this is placed in a container, and an ultrasonic oscillation device generates 4-string Hz ultrasonic vibrations from the bottom of the container. When applied for 1 minute, the fine particles that had coagulated and settled at the bottom of the container were completely dispersed and the plating solution became a milky white color, which was completely different from the plating solution for conventional composite plating. Even after being left for 4 days, no aggregation or precipitation of fine particles occurred, and the plating solution remained milky white.

Next, the operation of the plating liquid adjustment system 11 will be explained with reference to FIG. The plating liquid is removed from the plating liquid collection tank 12.
Here, the well-dispersed plating liquid 3 enters the dispersion liquid tank 12a and is sent through the pipe 23 to the pure water replenishment tank 22, while the precipitating liquid containing the particulate additives is sent to the precipitation liquid tank 12a. 12b, is sent to the settling liquid tank 13 via the pipe 14 and the pipe 15, enters the dispersion tank 4, receives ultrasonic vibration, disperses the particulate additive, and is sent to the adjustment plating liquid tank via the pipe 16. Sent to 17th.

In addition, the plating liquid is supplied from the pure water supply tank 22 to the plating liquid supply tank 2.
4 and 25, and joins the adjustment plating liquid tank 17. On the other hand, the plated material after the composite plating is placed in the ultrasonic cleaning tank 19, where the adhering particulate additives are shaken off and collected in the sedimentation tank 19b, from which the pump 2
1, it is sent to the settling tank 13 via the pipe 20, similarly subjected to a dispersion effect, and sent to the next step.

Further, the dispersion liquid enters the dispersion liquid tank 19a and is sent to the pure water supply tank 22 through the pipe 23. A completely adjusted plating liquid is stored in the adjusted plating liquid tank 17 and is returned to the plating tank 6 by a pump 18 via a hose 9.

In the plating pot 6, as shown in FIGS. 5 to 7, the air blowing holes 37a,
Air blows out downward from 38a and 39a, blowing up the particulate additives that were about to settle in the V-shaped groove 6e.

Since the temperature of the plating liquid returned from the hose 9 to the upper part Sb of the plating pot 6 has dropped considerably, it is injected between the diaphragms 32, 303 and each side surface 6c, 6d, and The plating solution 3 is gradually mixed into the plating solution 3 through the diaphragm while being warmed by a steam heater that does not heat the diaphragm. Therefore, the plating solution 3 is always kept at an appropriate temperature, and the particulate additives are neatly dispersed and composited in an ideal state. You can do plating. Since the present invention is constructed and operates as described above, the fine particle additives added to the plating solution for composite plating can be completely removed without using a dispersant such as a surfactant. The effect of uniform dispersion can be obtained. In addition, this allows uniformly dispersed fine particle additives to be precipitated in the plating layer formed on the surface of the object to be plated, resulting in a composite plating layer with excellent self-lubricating properties and wear resistance. You can get the desired effect. Furthermore, since dispersants such as surfactants are not required at all, it is possible to maintain good plating adhesion, and the temperature of the plating liquid can be raised, improving production efficiency. The effect that can be obtained is obtained. In addition, the plating solution is taken out from the bottom of the plating pot, the particulate additives are dispersed outside the plating tank, and then returned to the top of the plating tank, which prevents the particulate additives from settling and makes it possible to The effect of efficiently dispersing the particulate additive can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a plating pot showing a state in which particulate additives are aggregated; Fig. 2 is a longitudinal cross-sectional view of a dispersion tank showing a state in which particulate additives are dispersed using the apparatus of the present invention; The figures are a schematic vertical sectional view of an apparatus for carrying out the present invention, FIG. 4 is a block diagram showing a plating liquid adjustment system, FIG. Vertical cross-sectional view in the direction of arrows, No. 7
The figure is an enlarged vertical sectional view similar to FIG. 6 of the bottom of the plating bath. 1 is a fine particle, 3 is a plating liquid, 4 is a dispersion tank, 5 is an ultrasonic oscillator, 6 is a plating pot, 6a is a bottom part, 7, 8, and 9 are pipes, pumps, and hoses constituting a plating liquid conveying means, respectively. be. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. In a composite plating device using a plating solution containing a particulate additive such as an oxide, a carbide, or a metal, an ultrasonic oscillator is installed at the bottom of the plating tank of the plating device. A plating liquid conveying means is configured to connect a dispersion tank in communication, apply ultrasonic vibration to the fine particle additive in the dispersion tank to disperse it in the plating liquid, and return the plating liquid to the pre-read plating tank. A dispersion device for particulate additives, characterized by comprising: