KR950007670B1 - Apparatus of a deposition by an evaporating sprayer in a normal pressure - Google Patents

Abstract

The apparatus for vapor-plating metal of Zn, Al, Sn, or Pb on a steel plate, consists of a pretreatment section for cleaning the steel plate under a reducing atmosphere, and an evaporating deposition section for plating the vapor metal on the steel plate. The apparatus comprises: an air curtain (3) for forming an air cutoff layer by an inactive gas; a vapor metal supply part (4) including a spraying nozzle (5) for spraying the vapor metal on the steel plate; and a steel transfer part (6) for transferring the steel plate to perform the continuous vapor-plating.

Description

Deposition Plating Equipment by Atmospheric Pressure Steam Injection

1 is a schematic explanatory view showing, as an example, the main part of a conventional continuous low vacuum evaporated zinc plating apparatus compared with the present invention.

2 is a schematic illustration of the apparatus of the present invention.

3 is an explanatory view of the structure of the air curtain in FIG.

4 is a structural explanatory diagram of a pot of the raw material intermediate supply part in FIG.

5 is a line arrangement diagram as an embodiment of the atmospheric pressure continuous steam injection plating production equipment according to the present invention.

6 and 7 are closed working state diagrams in which the inlet and the outlet of the steel sheet are completely sealed in the conventional low vacuum evaporated zinc plating.

* Explanation of symbols for main parts of the drawings

(A) pretreatment zone

1: Steel plate mounting part 11: Halogen lamp

12: substrate

(B) Deposition area

1: steel plate mounting portion 12: substrate

2: Shutter 3: Air Curtain

4: metal vapor supply part 5: steel plate moving part

41: plating liquid pot molten metal bath 42: carrier gas line

43: metal heating furnace 44: nozzle

45: nozzle heating furnace 5: steel sheet

According to the present invention, after the inside of the plating apparatus is maintained in an inert atmosphere having low oxygen concentration by using an air curtain, zinc (Zn), lead (Pb), aluminum (Al), tin (Sn), etc. Evaporation plating method in an atmospheric pressure inert gas atmosphere, in which the raw material metal is heated above the boiling point and the vapor is spray-deposited on the surface of the steel sheet by a carrier gas, and in particular, the intermediate plating method suitable for mass production of high quality plated steel sheet by a continuous process The present invention relates to an apparatus for producing an intermediate plated steel sheet.

The plating methods developed so far include the hot dipping method, the electroplating method, and the recently developed nitrogen atmosphere low positive deposition method.

The hot dipping method currently applied to most production lines has a relatively simple manufacturing method and is easy to continuously mass-produce, but it is difficult to form one-sided plating, and it is difficult to form a thin plate film having a certain thickness or less. Has a non-uniform problem.

The electroplating method forms a plating layer using an electrochemical reaction in a metal electrolyte at a low temperature (50 to 70 ° C.), so that an alloy layer such as iron-zinc is not formed at the interface, and the structure of the plating layer is very dense and uniform. Therefore, high quality plated steel sheet having excellent corrosion resistance and surface properties can be obtained, but as the thickness of the plated film is increased, the reaction time during which the plated layer is formed increases in proportion to the production cost. There is a lot of hassle and difficulty to do.

In the vacuum deposition method, as in electroplating, there is no alloy layer, excellent film properties, and easy thickness control, but continuous mass production is difficult because both the plating material and the substrate must be maintained at a vacuum of 10 ^-5 torr or more. As a method of improving, a process of forming a vacuum degree of about 10 ^-2 torr using nitrogen and performing continuous plating in this atmosphere has been conducted in many countries around the world.

As a device according to the method of manufacturing a plated steel sheet by vacuum deposition, the most recently developed device is Japanese Patent Application Laid-Open No. 3-73636 (November 22, 1991). It is a device to control the roll gap of the steel plate surface while continuously rolling the steel plate in the vacuum chamber, and to prevent the occurrence of flaws and defects, the vacuum degree of the deposition chamber is usually maintained at about 0.01-0.2torr. have.

1 is a schematic view of the main part of the low vacuum deposition plating apparatus described above. This equipment is based on the method of connecting the newly developed evaporation plating equipment instead of the molten metal tank and cooling tower between the pretreatment and the skin pass mill in the existing melt plating equipment. To make it possible. Here, two deposition chambers are provided for double-sided plating, and a roll-type seal roller is installed continuously with the inlet and the outlet, and the vacuum chamber is sequentially lowered to atmospheric pressure. The vacuum is maintained as described above. 3 and 4 show the sealing devices installed in the inlet and the outlet, respectively. A vacuum pump is connected in several stages between each of the sealed devices installed in the lead-out unit, and the nitrogen gas discharged is sent to the plating device through the purification device.

In addition, a cooling system (N ₂ Gas Jet Cooler), a nitrogen gas chamber (N ₂ , Gas Room) for blocking the atmosphere between the pretreatment process and the deposition apparatus, in order to cool the steel sheet introduced after the pretreatment or the steel plate after the deposition plating. There is a heating device (Edge Heater) to compensate for the effect of cooling the steel sheet by the gas flow formed in the introduction portion of the steel sheet while making a vacuum.

However, the recent Japanese prior art and other techniques introduced above have to maintain the deposition plating atmosphere in vacuum and also require high vacuum degree, so that the galvanized layer can be obtained satisfactorily, but it requires enormous equipment cost and maintenance cost. Due to the hassle, continuous mass production is difficult, and it is difficult to maintain uniform quality due to the difficulty in maintaining and operating the equipment.

Referring to Figures 6 and 7 of the accompanying drawings, it can be seen that the inlet and the outlet of the steel sheet are completely sealed to maintain the vacuum state for the conventional continuous deposition plating operation. It is very inconvenient to control the maintenance work, there is a problem that productivity is very low.

Therefore, the present invention eliminates enormous equipment costs and equipment maintenance costs by not using the vacuum equipment as described above, and also facilitates continuous operation and maintenance of equipment. The aim is to provide a device that facilitates work control.

In the intermediate plating apparatus for depositing and plating metals such as zinc, aluminum, tin, and lead on a steel sheet, the present invention is a pretreatment zone under a reducing atmosphere for smoothing and cleaning the surface of the steel sheet to increase the intermediate plating workability. A metal vapor supply unit having a nozzle for depositing and plating molten metal on the surface of a steel sheet by heating and supplying air curtain and molten metal vapor for forming a nitrogen gas film by suction of an inert atmosphere gas such as nitrogen from the outside and the outside; The vapor deposition plating apparatus according to the atmospheric pressure steam injection, characterized in that the metal vapor is divided into a deposition plating zone consisting of a steel plate moving portion for supply injection sprayed intermediate coating.

In the present invention, in order to produce a high-quality coated steel sheet having excellent corrosion resistance and surface properties at a relatively low production cost, the present invention does not require a vacuum apparatus, which forms a plating layer by spray deposition under an inert atmosphere at atmospheric pressure, and is capable of continuous process plating. The method was developed.

That is, the present invention creates a method for forming a metal plating layer to disperse a gaseous metal on a steel sheet using a carrier gas under a nitrogen atmosphere under atmospheric pressure, and to provide an air curtain at the inlet and outlet of the atmospheric pressure deposition plating apparatus. It relates to an apparatus for installing and injecting an inert gas as well.

The inert atmosphere inside the plating apparatus is maintained by the air curtain and the inflow of nitrogen into the plating apparatus continuously. The air curtain devised in the present invention has the same structure as in FIG. 5, which is installed on both sides of the plating apparatus and forms a gas barrier film using nitrogen to separate the atmosphere inside and outside the plating apparatus. At the same time, nitrogen is continuously blown into the plating apparatus to create an inert atmosphere with an oxygen concentration of 100 ppm or less.

Since the inside of the plating phase is atmospheric pressure, the raw material zinc is heated above the boiling point (960 ° C.), and the vapor generated at that time is sprayed onto the steel sheet through a nozzle using high purity nitrogen as a carrier gas to form an intermediate plating film.

Hereinafter, as an example of the present invention will be described in more detail the device configuration and operation effects of the present invention when zinc deposition plating;

2 shows an example of the apparatus of the present invention. The apparatus is largely divided into a pretreatment zone (a) and a deposition plating zone (b). In addition, the pretreatment zone (a) and the deposition plating zone (b) is completely blocked by the shutter (2).

The shutter 2 has a shutter 21 for accommodating the shutter 2 thereon, and all parts except one side and the lower end of the shutter accommodating portion 21 are sealed off from the outside.

Nitrogen (N ₂ ) gas enters one side of the shutter housing 21 as an inert gas and is sucked into the deposition zone b. Of course, the nitrogen (N ₂ ) gas may be sucked directly into the deposition zone b without passing through the shutter housing 21.

The pretreatment zone (a) is provided with a substrate (12) on which the steel plate (S) can be placed, and a plurality of halogen lamps (11) are mounted on the substrate to control the temperature of the steel sheet during the pretreatment and deposition operations. .

The post-treatment zone is composed of an air curtain 3, a metal vapor supply section 4, and a steel plate moving section 5 as deposition zones b. As shown in FIG. 3, the air curtain 3 forms a blocking film with argon (Ar) or a nitrogen inert gas to block the atmosphere inside and outside the apparatus. The upper part is inert gas inlet 31, such as nitrogen (N ₂ ), and the induction blades 32 are usually mounted obliquely on both sides thereof for uniform distribution in the interior of the gas.

Accordingly, the deposition zone (b), which is a post-treatment zone of the present apparatus, is always maintained in an inert atmosphere due to the inflow of nitrogen (N ₂ ) gas sucked from the air curtain 3 and the shutter portion 2 inside the apparatus. Here, the case where the raw material of the deposition plating is zinc (Zn) will be described as an example.

As shown in FIGS. 2 and 4, the zinc vapor supply unit 4 includes a zinc tank 41 for supplying zinc heavy steam and a carrier gas for injecting zinc vapor into the zinc tank 41. Zinc-line heating furnace 43 for heating the gas line 42, the zinc tank 41 and the entire gas line 42 above the boiling point of zinc, and also supplying and supplying zinc vapor from the zinc tank 41. It consists of a nozzle 44 of a linear shape and a nozzle heating furnace 45 (not shown) for heating the nozzles 44 on both sides to maintain fluidity. Since the zinc vapor is injected through the nozzle 44 in the zinc vapor supply part 4, the steel sheet S continuously passes over the nozzle 44, so that the continuous vapor deposition is performed. At this time, the zinc 44 should be heated or heated to prevent solidification while passing through the nozzle 44 to stick to the nozzle 44.

In the apparatus according to the present invention as described above, the steel sheet is supplied into the pretreatment zone (a) and, for example, made into a vacuum of about 10 m torr, and then mixed with N ₂ : H ₂ gas at an appropriate ratio to purge to form a reducing component atmosphere. The steel plate is heated to perform pretreatment while continuing the next purging process, which reduces the iron oxide on the surface of the steel plate, thereby leveling and improving the adhesion between the steel plate and the zinc plated film to be cleaned.

When the above-described pretreatment is completed, the steel sheet S is cooled, and the shutter 2 is extracted with heat to move to the deposition zone b that is already maintained in a nitrogen atmosphere.

In the deposition zone b, as shown in FIG. 2, an air curtain 3 is installed at one end, and a nitrogen gas barrier film is formed by inflow of nitrogen gas N ₂ , and the steel sheet is deposited in this inert atmosphere. Will be.

On the other hand, the above-described zinc bath 41 containing the raw zinc and the zinc bath heating furnace 43 for heating the zinc bath 41 is installed in the lower surface of the apparatus as shown in FIG. And using the thermostat to keep the zinc bath 41 constant at the desired temperature. In addition, the carrier gas is preheated by returning the outer side of the zinc bath so that the injected vapor is not greatly cooled by the inlet carrier gas.

The metal vapor spraying device on the plating liquid pot or the molten metal bath 41 described in the above-described embodiment is zinc, aluminum, tin, etc. melted in the molten metal bath 41 as shown in detail in FIG. In order to form a plating film in the plating of a metal by deposition, a carrier gas line 42 is mounted inside and outside the molten metal bath 41 to blow a carrier gas flow having a pressure to a gas metal such as gas zinc and a nozzle. To be jetted upward through (44)

5 shows one embodiment of a deposition plating line arrangement for converting the above-described apparatus of the present invention into a continuous plating production facility. The steel sheet (S) passing through the lower pretreatment zone (a) passes through the central opening of the closed shutter (2) through the pretreatment zone (a) where a reducing component atmosphere is formed by a mixed gas of nitrogen and hydrogen, and then, for example, nitrogen (N2) The gas is purged and enters the deposition zone b, which is a post-treatment zone under an inert atmosphere, and the carrier gas injected from the plating liquid pot 41 through the carrier gas transfer line 42 is zinc (Zn), lead ( Steel plate S continuously moved by a deposition plating apparatus in which deposited metal heavy metals such as Pb), aluminum (Al), tin (Sn), and the like can be simultaneously sprayed on both sides of the can plate (S) through the nozzle unit (5). It is supposed to be deposited by a predetermined thickness.

The air curtain 3 above FIG. 5 is nitrogen from the outside as described above. It serves to form an air barrier membrane by nitrogen gas generated by purging by inhalation of inert gas such as argon.

As described above, in contrast to the cumbersome and incomplete operation of a vacuum chamber and a closed vacuum in a conventional deposition plating line, which requires a huge cost, an inert gas or a reducing component composition for forming a reducing atmosphere or an inert atmosphere from the outside is disclosed. By inhaling gas and creating such an atmosphere, it is possible to provide an open (open) style deposition plating apparatus that can facilitate further work, equipment failure, and maintenance compared to a closed vacuum atmosphere operation. In addition to reducing the cost, the company has also been able to bring dramatic improvements in productivity and workability.

Claims (3)

In the deposition plating apparatus for the intermediate plating of metals such as zinc, aluminum, tin, and lead on a steel sheet, the pretreatment zone (a) and the steel sheet under a reducing atmosphere for smoothing and cleaning the surface of the steel sheet to increase deposition plating workability The deposition plating is divided into two parts, and the deposition plating is carried out by the air curtain 3 and the molten metal heavy metal for forming an air barrier film by argon, inert gas such as nitrogen by inhalation of inert atmosphere gas such as nitrogen from the outside. Metal vapor supply section 4 having injection nozzles 5 for depositing molten metal on the surface of steel sheet by heating and supplying spraying, and steel sheet moving section 6 for supplying, spraying and continuously depositing metal plating. Deposition plating apparatus by atmospheric steam injection, characterized in that consisting of and. The metal vapor supply unit (4) comprises a conventional metal melting tank (41) for supplying heavy metals, and the metal vapor injection nozzle (44) is provided in the metal melting tank (4). The carrier gas gas line 42 carrying the heavy metal for injection into the furnace is embedded and the metal melting tank 41 and the whole carrier gas gas line 42 are covered from below and the metal is heated above the boiling point of the metal. Evaporation plating apparatus by atmospheric steam injection, characterized in that the metal melting heating furnace 43 is configured to be formed under the melting (4). According to claim 1, The air curtain (3) is a plurality of gas inlet 31 for introducing an inert gas, such as nitrogen, and the induction blade (32) to distribute the introduced gas evenly and the inner surface of the honeycomb network Deposition plating by atmospheric steam injection, comprising a structure 33 and having an opposite side of the gas inlet 31 opened so as to form a gas shielding film by an inert gas such as nitrogen into the deposition plating zone b. Device.