JPS6023200B2 - Manufacturing equipment for iron-zinc alloy electroplated steel sheets - Google Patents

Description

[Detailed description of the invention] The present invention relates to an iron-zinc alloy plating apparatus.

As an iron-zinc alloy plated steel sheet product, a product made by heating a hot concentrated zinc alloy plated steel plate and alloying it with a steel plate is commercially available. Such alloy-plated steel sheets have difficulties in weldability and workability.
There is a strong need to solve these difficulties by making the iron-zinc alloy layer thinner.

In particular, there is a strong need for new rust-proof steel sheets for automobiles and home appliances. However, the optimal method for thin alloy plating that satisfies this requirement is electroplating, but although iron-zinc alloy electroplated steel sheets have been produced experimentally and their properties are known, they cannot be applied on an industrial scale. Currently, manufacturing has not yet been established.

The present invention aims to provide an excellent device that can easily industrially produce iron-zinc alloy electroplated steel sheets.The present invention is characterized by a cleaning device and independent plating of iron and zinc. An iron-zinc alloy electroplating device that is equipped with a replenishment tank that dissolves in a liquid, an electroplating device that has an insoluble anode attached to the position where the plated steel strip passes through, a cleaning device, and a drying device that are successively installed. plating equipment. and a cleaning device, an electroplating device equipped with a replenishment tank for dissolving iron and zinc into independent plating solutions, and an impregnable anode attached to the position where the plated steel strip passes, a cleaning device, and a plated steel plate post-treatment device. , iron-zinc alloy plating equipment, which has successively installed drying equipment. The electroplating equipment is equipped with a replenishment tank that independently dissolves iron and zinc into the plating solution, and an electroplating equipment with an impervious anode installed at the position where the plated steel strip passes through, the cleaning equipment, and a simple heat treatment equipment are successively connected. Iron-zinc alloy electroplating equipment installed. and a cleaning device, an electroplating device equipped with a replenishment tank that independently dissolves iron and zinc into the plating solution, and an insoluble anode attached to the position where the plated steel strip passes, a cleaning device, a simple heat treatment device, and a plated steel sheet post-coating device. The present invention relates to an iron-zinc alloy electroplating device in which a processing device and a drying device are sequentially connected. That is, in the present invention, a plating solution circulation supply tank is attached to the electroplating apparatus, which dissolves the iron source and zinc source in the plating solution at a constant rate in the tank, and introduces this into the plating tank. provided for the purpose of

In the case of iron-zinc plating, the iron-zinc ratio in the plating bath usually does not match the iron-zinc ratio in the plating solution, so as plating continues, the iron-zinc ratio in the bath changes. do. Therefore, a portion of the liquid from the plating tank is constantly taken into the supply tank, the iron-zinc ratio is adjusted in the tank, and the liquid is introduced into the plating section. This operation is performed continuously to maintain a constant plating solution composition in the plating bath and to perform stable plating. When producing a large amount of iron-zinc alloy plated steel sheets (for example, when the amount of plating is approximately 20 tons per month, the monthly production of 0.8-thickness steel sheets is more than 1 ton), plating at high speed and high current density is required. is necessary.

The efficiency of iron-zinc plating is that even if the pH, temperature, flow rate, etc. of the solution are set to the optimum conditions, the current efficiency is at most 70 to 80%, so the amount of plating is about 20 μm / that 0.8-thick steel plate. 1 month production
When producing 5,000 tons, the line speed is approximately 20 HP.
m, operation at a current density of about 200 A/d is required.
At such high current densities, the use of iron or zinc as the ion source and anode is not recommended due to reasons such as the need for frequent replacement of the anode and the occurrence of oxidation in the case of zinc anodes. becomes difficult. In addition, iron-zinc alloy plated steel sheets are mainly used for automobiles and home appliances, so the sheet thickness is 0.
．． The 6 to 1.2 side is the king, and horizontal plating equipment that passes the strip horizontally occupies a smaller area.
That is, assuming high-speed mass production, it is advantageous to use horizontal equipment and use a non-falling anode. Unlike vertical lines, horizontal lines use gas removal technology and a non-porous anode to prevent hydrogen gas generated on the cathode surface and oxygen gas generated on the anode surface from stagnation. Therefore, external iron and zinc ion supply technology is required. As a result of various studies on these issues, the inventors found that in order to remove the gas generated at both electrodes and perform good plating, a large amount of plating solution is supplied between the two electrodes to forcefully remove the generated gas. It was found that it was effective to remove the

In other words, this process serves both to replenish the plating solution to the plating area and to prevent gas accumulation. On the other hand, as a result of various studies regarding the iron-zinc supply method, it was found that a system in which the iron source and zinc source are supplied independently is practically desirable.

If you try to dissolve and replenish the iron source and zinc source at the same time, it is likely that only the zinc will dissolve due to the zinc-iron short-circuit battery action, resulting in a difference in dissolution rate, and it will be difficult to dissolve the specified amount of iron. This is because dissolution becomes difficult. In addition, in the case of thin items,
Vertical plating. A line is also effective, but in a vertical plating line, the gas in the plating solution escapes upward, so there is little need to replenish the plating solution between the two electrodes, that is, between the plated steel strip and the electrode.

Next, in order to simultaneously dissolve iron and zinc, it is necessary to use extremely vigorous blowing or blowing gas, and in order to prevent oxidation of ferrous ions to ferric ions, this gas must be Must be non-oxidizing.

For this reason, it is actually easier to control the dissolved amount by melting the zinc source and the iron source separately and independently. Based on the above findings, the inventors developed an independent supply system for iron and zinc and forcibly introduced plating solution from a tank between the insoluble electrode and the strip electrodes to the plated part of iron-zinc alloy plating. It was confirmed that it was possible to replenish the plating solution.

A steel plate plated in a plating department having such ancillary equipment is led to a cleaning device to remove the plating solution adhering to the plated steel plate, and is dried in a drying device to form a product.

Further, a plated steel plate post-treatment device is provided next to the above-mentioned cleaning device, and performs, for example, chromate treatment, phosphate treatment, etc.

When this single-sided plated steel sheet is used, foreign matter partially attached to the non-plated surface (steel surface) is removed by brushing, or a thin Nj layer is plated to improve the phosphate treatment properties of the steel surface. After post-treatment of the plated steel plate, it is dried and made into a product. Further, as described above, a simple heat treatment device is installed next to the electroplating device and the cleaning device, and heat treatment is performed on the plated steel sheet after iron-zinc alloy plating to a temperature of, for example, 200 to 300 qo to improve the adhesion of the plating layer to the original plate. The grain size of the iron-zinc alloy is adjusted to improve workability and then the product is made. Moreover, the amount of iron-zinc alloy can be adjusted according to the application.

In other words, adjusting the amount of alloy (iron content) in the plating layer in order to make the weldability of the product to a certain level is much easier than controlling the plating conditions (adjusting the richness component, pH, temperature, etc.) . For example, in plating equipment, plating is performed under conditions that allow for stable alloy plating, ensuring a constant iron concentration in the plating layer, and heat treatment to equalize the distribution of iron in the alloy layer, making it suitable for industrial applications. This method has an excellent effect in that various types of alloy electroplated steel sheets can be easily manufactured. In addition, in the present invention, a post-plating treatment apparatus for performing chromate treatment, phosphate treatment, and treatment of the non-ferrous surface of a single-sided alloy plated steel sheet may be provided next to the simple heat treatment apparatus as described above.

By doing so, it is possible to stably produce iron-zinc alloy electroplated steel sheets, which brings about great industrial effects.

Next, examples of the device of the present invention will be described.

Embodiment 1 As shown in FIG. 1, an apparatus for manufacturing iron-zinc gold electroplated steel sheets is constructed.

In Fig. 1, a steel strip coil 2 is attached to the uncoiler 1, 1'.
, 2' are attached, and the steel strip 5 is continuously passed through the shear 3 and welder 4.

The steel strip 5 is cleaned in a cleaning device 11 consisting of a looper 6, a degreasing device 7, a water washing device 8, a pickling device 9, and a water washing device 10, and then is plated with iron-zinc alloy in an electroplating device 12. .

Directly from the plating bag, a part of the plating solution is taken out from the plating tank 14 to the plating solution replenishment tank 15, which consists of separate tanks 15' and 15'', and iron is supplied to the tank 15' and zinc is supplied to the tank 15r. The insoluble electrode 23 in the plating tank 14 is adjusted by adjusting the amount of iron and zinc in the solution.
(anode) via the pump 13, and continuously replenishes the plating solution while degassing this area. The iron-zinc alloy plated steel strip 5 is then cleaned by a cleaning device 11'.
The product is washed with water, then dried in a drying device 16, passed through a looper 6', coated with oil in an oiler 17, passed through a shear 3', and wound into coils 2a and 2a' by recoilers la and la' to form products.

Example 2 As shown in FIG. 2, an apparatus for manufacturing iron-zinc alloy electroplated steel sheets is constructed.

In FIG. 2, an electroplating device 12, a cleaning device 11'
Next, a plating post-treatment device 21 consisting of a treatment device 18 such as a chromate treatment and phosphate treatment device, a post-treatment device 19 for iron surface of single-sided plated steel plate, a cleaning device 20, etc. is installed.
Post-process the plated steel plate, drying device 16, looper 6
', oiler 17, coils 2a, 2 via sear 3'
Roll it up into a' shape.

Example 3 As shown in FIG. 3, an apparatus for manufacturing an iron-zinc alloy electroplated steel sheet is constructed.

In FIG. 3, an electroplating device 12, a cleaning device 11'
Next, a simple heat treatment device 22 is installed to treat the plated steel strip 5.
The product is heat-treated to improve workability, improve the adhesion of the alloy layer, and adjust the amount of iron-zinc alloy according to the application.

Embodiment 4 As shown in FIG. 4, an apparatus for manufacturing iron-zinc alloy electroplated steel sheets is constructed.

In FIG. 4, an electroplating device 12, a cleaning device 11'
, the simple heat treatment device 22 is followed by a treatment device 18 such as a chromate treatment device or a phosphate treatment device as in Example 2 above.
, processing equipment 19 for iron surfaces of single-sided plated steel plates, cleaning equipment 20
A plating post-processing device 21 consisting of the following is installed to perform post-processing on the plated steel strip 5 after heat treatment, and convert it into a product via a drying device 16 and the like.

[Brief explanation of drawings]

FIG. 1, FIG. 2, FIG. 3, and FIG. 4 are explanatory diagrams showing an embodiment of the present invention. 11, 11'...Cleaning device, 12 Electroplating diamond counterfeit, 15...Replenishment tank, 16...Drying device, 21...Plating post-processing device , 22...
...Simple heat treatment equipment, 23...Fixed-proof anode. Boat chart N Boat chart size boat

Claims (1)

[Scope of Claims] 1. A cleaning device, an electroplating device equipped with a replenishment tank for independently dissolving iron and zinc into a plating solution, and an insoluble anode, a cleaning device, and a drying device installed in sequence. A manufacturing apparatus for iron-zinc alloy electroplated steel sheet, characterized in that: 2. A cleaning device, a replenishment tank for dissolving iron and zinc into the plating solution independently, and an electroplating device equipped with an insoluble anode, a cleaning device, a plated steel plate post-processing device, and a drying device were installed in sequence. A manufacturing apparatus for iron-zinc alloy electroplated steel sheet, characterized in that: 3. Iron characterized by being equipped with a cleaning device, a replenishment tank for independently dissolving iron and zinc into a plating solution, and sequentially installing an electroplating device equipped with an insoluble anode, a cleaning device, and a simple heat treatment device. - Manufacturing equipment for zinc alloy electroplated steel sheets. 4 Cleaning equipment, electroplating equipment equipped with a replenishment tank that independently dissolves iron and zinc into the plating solution, and equipped with an insoluble anode, cleaning equipment, simple heat treatment equipment, plated steel plate post-treatment equipment, and drying equipment 1. An apparatus for manufacturing iron-zinc alloy electroplated steel sheets, characterized in that the following are successively installed.