The method of processing metal strips or wire in vacuum and device for its implementation

 

(57) Abstract:

The invention can be used for surface treatment of metal strips or wire in vacuum at various stages of the process. The method includes the initiation of the arc discharge and surface cleaning tape or wire cathode spots arcs, and the tape or wire is introduced into the vacuum chamber and removed from it through the appropriate bath with liquid metal or alloy, and after cleaning the surface, apply a double layer of protective coating. The device includes a vacuum chamber with a rotary system and the vacuum system, electric arc electrodes with the power supply, the means of transporting the metal strips, block electromagnetic coils placed in the area of the electrodes, and the power coating, located downstream behind the arc electrodes. The invention improves the performance, the quality of products and reduce environmental pollution. 2 c. and 2 C.p. f-crystals, 1 Il.

The invention relates to the field of surface cleaning tape or wire in vacuum with subsequent application of a protective coating and may be used is a metallic tape in vacuum (ed. mon. USSR N 476.041, B 08 B 1/00, 1971; N 937.059, B 08 B 7/04, 1980; N 1.272.725, C 22 B 9/20, 1985; N 1.695.704, C 23 C 14/22, 1987; N 1.806.870, B 08 B 3/10, 1989; U.S. patent N 5.036.689, B 21 B 45/64, 1991; N 5.143.561, B 21 B 45/06, 1992; French patent N 2.664.510, B 21 B 37/08, 1992; Bulat C. E., Esterlis M. H. Cleaning of metal products from scale, oxide film and impurities electric discharge in vacuum. Physics and chemistry of materials processing, 1987, N 3, Maksimov, L. Y., Krivonos, A. Environmentally safe cleaning of the metal in the stream. Heavy engineering, 1997, No. 5, S. 36, Fig. 3 and others).

Of the known methods and devices closest to the present invention is the Method of cleaning tape or wire in vacuum and device for its implementation" (Maksimov, L. Y., Krivonos, A. Environmentally safe cleaning of the metal in the stream. Heavy engineering, 1997, No. 5, S. 35 - 36, Fig. 3), which is selected as prototypes.

To clean the surface of the tape or wire according to this method, you must provide transportation ribbon or wire through the vacuum chamber, the input and output which represents a technical challenge. This is because the seal of input and output must provide a good quality sealing with a long lifetime and the high quality of POC (small compression), various rubber seals, etc. wear quickly spoil the surface of the metal strips or wires are deformed and do not provide a good and reliable sealing of the vacuum chamber in the long run. Therefore, the sealed input and output tapes or wires in a vacuum chamber largely determine the performance and quality cleaning their surfaces from contamination.

However, the cleaning of the surface metal strips or wire from oxides and contamination does not guarantee good quality of these metal products. Cleaning the surface of the metal strips or wire from oxides and other contaminations - operation necessary to prepare it for application of protective coatings that provide long-term protection against corrosion. Corrosion causes great damage to the economy of all countries. According to the firm Parker, currently the loss of steel from corrosion all over the world are of the order of 100 million tons, or 20% of the total world steel production. Therefore, the combination of processes of cleaning and applying protective coatings on the surface of a metallic tape or wire is an important technical operation, providing high corrosion soubrette is to increase productivity and quality of cleaning and corrosion protection of surfaces of metal strips or wire.

This objective is achieved in that according to the method of processing metal strips or wire in vacuum, including the initiation of the arc discharge and surface cleaning of metal strips or wire cathode spots arcs, the tape or wire is introduced into the vacuum chamber and removed from it through the appropriate bath with liquid metal or alloy, and after cleaning the surface of the metal strip or wire is to be applied on their surface one - or two-layer protective coating.

To improve adhesion and corrosion resistance of the first layer is produced in the vacuum immediately after cleaning metal strip or wire, used for ion-plasma, plasma diffusion, steam, etc., technologies for the deposition of metals, preferably zinc or aluminum.

With the aim of improving the quality of the protective coating application of the second coating layer is carried out by combining with the output metal strip or wire of the vacuum chamber through the bath of liquid metal or alloy, preferably with zinc, aluminum or their alloys.

The proposed method can be implemented by a device containing a vacuum chamber with a rotary system is lechaschau tape or wire, and provided with a block of solenoid coils and block coating moreover, the block electromagnetic coils placed in the zone of the arc electrodes and the block coating is located behind the arc electrodes in the course of the process.

In the device as the gateway system used vacuum stopper, the body of which is equipped with a heater, made in the form of two communicating vessels and filled with molten metal or alloy, and the difference in level of the liquid metal or alloy in communicating vessels with a stock resists the external atmospheric pressure. While using liquid metals or alloys of communicating vessels (inlet and outlet sluices) they are added.

The essence of the method consists in the following.

The entire process of the proposed method consists of three operations: cleaning the surface of the metal strip or wire in vacuum arc discharges, the first layer of the coating in vacuum and apply a second coat of the coating by immersion in molten metal or alloy at the outlet of the vacuum chamber.

When burning arc discharges in vacuum on the surface of a metal tape or wire (cathode) are formed many notices the Chena main part of the energy, which excels in electric discharges. Due to the high current density cathode spots in them being high density thermal energy, resulting in the area of the cathode spots is instantaneous heating of the surface (cathode). In the scale, rust and other contaminants vaporized and sprayed (cathode sputtering) in a vacuum. After passing through the cathode spots on the surface of the metal strip or wire, it is cleaned at the atomic level, until evaporation atomic layer of the base metal. Better cleaning today not yet implemented.

The first layer in vacuum on the interaction of ions sputtered metals in an electrostatic field, where the cathode used metal tape or wire, on the interaction of the neutron metal atoms or drops in the vapor phase to the surface of a metal tape or wire. Extracted from plasma metal-ions under the influence of the electrostatic field bombard the surface of the tape or wire, and the neutral atoms or particles of metal vapor under the influence of a difference of concentration is diffused from the source (arc, resistive evaporator, etc.,) to p is consequently superimposed on one another, particles (ions, atoms, droplets of metal pair) form a layer of metal of any thickness depending on the flux density of particles on the surface and time of application, which has sufficient adhesion to the surface of the tape or wire (metal ions depending on their energy can even be implanted in the surface layers of tape or wire).

A second layer of protective metal or alloy is applied by passing the metal ribbon or wire through a bath of molten metal or alloy, preferably with zinc, aluminum or their alloys. With increasing aluminum content in the bath and the use of aluminum in the first layer of the coating layer FeZn7, which is formed in galvanizing between the surface of the steel strip or wire zinc coating decreases. Since this intermediate layer is very brittle and reduces the ability of the zinc coating to the bend, then reducing the thickness of the FeZn7has a beneficial effect on the coating quality of the tape or wire. In the combined two-layer coating the intermediate layer FeZn7significantly reduced or completely disappears.

A device for the implementation of the proposed methods for the howl cleaning, 3 - unit solenoid coils, 4 - leads, 5 - block coating on the tape or wire, 6 - metal strip or wire, 7 - system degassing, 8 - inputs, 9 - power electric arcs, 10 - power vacuum of the catalyst 11 is a device for removing liquid metal or alloy with tape or wire, 12 - a device for removing excess molten metal or alloy with a metal tape or wire, 13 - molten metal or alloy, 14 - case liquid metal vacuum shutter (siphon), 15 - heater.

The proposed method of processing a metallic tape or wire is as follows.

The cleaned metal strip or wire 6 through a transmission system (not shown in the drawing) is supplied to the vacuum chamber 1 through a gateway system, made in the form of baths, filled with molten metal or alloy 13. And baths are communicating vessels, in which the difference in level h with a stock resists the external atmospheric pressure. Since there are no rubbing parts, metal tape or wire easily and without much effort passes through the liquid metal bath in the vacuum chamber. If this is Amy at the entrance of the vacuum chamber on the ribbon or wire liquid metal or alloy is removed from the surface of the ribbon or wire through the device 11 is mechanically or through the impact of covering the travelling magnetic field, in which the conductive liquid metal or alloy is removed from the surface of the tape or wire by centrifugal forces.

Then, a metallic tape or wire is cleaned arc discharge using a block of 2 electrodes (anodes), block 3 of solenoid coils, the current leads 4 and 9 sources of supply of electric arcs. Unit 5 coating on the metal strip or wire 6 provides the first layer of metal or alloy innoplast, diffusion-vacuum, steam, etc. methods.

For example, a thin layer of aluminum is very favorable for the subsequent application of liquid zinc, in this case, improved corrosion resistance and plastic properties of protective coatings. If you first apply a thin layer of zinc, and then a layer of aluminum, then eliminated the formation of intermetallic compounds of aluminum on steel or copper plating is very beneficial before applying tin or other metals and alloys.

As liquid metals or alloys in baths 13 their ever meet.

Thus, the proposed method is compared with the prototype and other similar methods provides quality cleaning and corrosion of the surface metal strips or wire, and applying the combined two-layer (and if you put a few baths with liquid metal or alloy, then arbitrarily layer coating) on the cleaned surface before the release of metal strip or wire of the vacuum chamber, i.e., under ideal conditions, when no oxidizing environment and do not form oxides on the surface of the protected metal, not even the adsorbed water on the surface of the coated metal.

In addition to technological feasibility optimally solved feasibility fitting combination of such processes as cleaning and surface coating of metal strips or wires, as well as in connection with this excludes intermediate warehouses, eliminating the need for costly treatment facilities, eliminating the production, use and disposal of acids, degreasing agents, fluxes, and wash water, drying chambers, etc., the Process lends itself well to automation, reduced staff.

High quality steel tape or wire with protective coatings and high efficiency of application of such tape or wire in various industries allows us to raise the question of the issuance of almost all rolling and drawing products in a secure manner.

1. How about the ku surface of the tape or wire cathode spots arcs, characterized in that the tape or wire is introduced into the vacuum chamber and removed from it through the appropriate bath with liquid metal or alloy, and after cleaning the surface of the tape or wire, put on her two-layer protective coating.

2. The method according to p. 1, characterized in that the first layer coating is carried out by vacuum plasma spraying of metal, preferably zinc, and aluminum.

3. The method according to p. 1, characterized in that the application of the second coating layer is carried out by combining with the output of the tape or wire from the vacuum chamber through the bath of liquid metal or alloy, preferably aluminum, zinc or their alloys.

4. A device for processing metal strips or wire containing a vacuum chamber with a rotary system and the vacuum system, electric arc electrodes with the power supply, the means of transporting the metal strips or wires, characterized in that it comprises a unit of electromagnetic coils placed in the area of the electrodes, and the power coating, located downstream behind the arc electrodes, and the gateway system consists of a vacuum liquid metal, llama or alloys thus, what is the difference between their levels in communicating vessels with a stock resists atmospheric pressure, in this case the gates are provided with heaters.

 

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