JPS627884A - Production of corrosion-resistant surface-treated steel sheet and its device - Google Patents

Abstract

PURPOSE:To improve the bonding strength of a corrosion-resistant coated film to the base iron by spraying the particles of a metal or an alloy on a continuously traveling steel strip to continuously form the corrosion-resistant film on the long-sized steel strip. CONSTITUTION:The particles of a metal or an alloy is charged into a injection chamber 12 from a feeder 11 and the particles are injected toward a steel strip 15 wound on a roll 14 through an injection nozzle 13 which is provided at a position where the steel strip 15 is brought into contact with the delivery roll 14 to continuously form a corrosion-resistant coated film 16. By such a method, a corrosion-resistant surface-treated steel sheet can be continuously obtained and the bonding strength between the corrosion-resistant film and the base iron can be improved by utilizing the injection pressure produced by the spraying of the particles for the formation of the corrosion-resistant coated film.

Description

TECHNICAL FIELD The present invention relates to a method for continuously forming a corrosion-resistant coating on a long steel strip, and an apparatus therefor.

(Prior art and its problems) Blasting, which is widely used as a method for mechanically cleaning the surface of steel plates, involves spraying various types of shots such as pig shot, steel shot, car/twin shot, etc. onto the material to be polished. It removes dirt, rust, etc. (Metal Surface Technology Association, “Metal Surface Technology Handbook (New Edition)” Nikkan Kogyo Shimbun, No. 17
(See pages 4-179). As a modification of this blasting treatment, applications have been developed not only for surface purification but also for forming a corrosion-resistant coating. For example, by using zinc-coated shot granules, you can clean the surface of steel materials and
A method of forming a zinc coating layer has been proposed (Tokuko Kokō 5)
9-9312).

Since this method can perform plating without using a large amount of heat or electricity, it is advantageous compared to electroplating, hot-dip plating, vapor deposition plating, etc. in terms of equipment and work conditions. However, since this method using zinc-coated shot is a batch method, it is not suitable for plating long materials such as steel strips.

(Objective of the Invention) The object of the present invention is to eliminate the drawbacks of the plating method using coating shot and to continuously plate a long material.

(Structure of the Invention) In order to achieve the object, the method of the present invention sprays metal or alloy particles onto the surface of a continuously running steel strip from a spray nozzle placed at a position where the steel strip and a feed roll come into contact. It is characterized by

In addition, the equipment used for this purpose is equipped with a feeding mechanism that continuously runs the steel strip, and a spray nozzle that sprays metal or alloy particles onto the continuously running steel strip is placed at a position where the steel strip and the feed roll come into contact. It is characterized by

(Example) Next, the present invention will be specifically explained by referring to an example. FIG. 1 shows an outline of the surface treatment apparatus. The steel strip 2 continuously sent out from the uncoiler 1 passes through a degreasing tank 3, a washing tank 4, and a drying Ja 5, and then enters an anticorrosion coating forming device 6.

After applying the required anti-corrosion coating, the post-treatment device 7 and the water washing device 8
After passing through a dryer 9, it is again wound into a coil by a recoiler 10 and sent to the next process. The anticorrosive film forming device used here has a structure as shown in FIG. and a steel strip 15 wrapped around a metal roll 14.
The anti-corrosion liquid 11916 is formed. The sprayed particles that do not participate in the formation of the coating are collected by the cover 17 and are prevented from scattering. The cover 17 also has the function of facilitating the suction of metal or alloy particles into the separation and purification device 18. The cover 17 feeds the reusable metal or alloy particles sorted by the zero separation and purification device 8 to the one-ring device 19, and is used to collect the reusable metal or alloy particles into the one-ring device 19. It is again supplied to the injection chamber 12 together with the raw material grains.

(Effects of the Invention) As described above, according to the present invention, an anticorrosion coating can be continuously formed on a long steel strip by spraying metal or alloy particles onto a continuously running steel strip. In addition, since the spraying is performed on the surface of the steel strip where it is backed up by the feed roll, the spray pressure is effectively used to form the anti-corrosion coating, and the strength of the resulting anti-corrosion coating to the base steel is also improved. do.

[Brief explanation of drawings]

FIG. 1 shows an outline of a surface treatment apparatus, and FIG. 2 shows an example of an anticorrosion coating forming apparatus used in the present invention.

Claims (2)

[Claims] (1) A method for producing a corrosion-resistant surface-treated steel sheet, which comprises spraying metal or alloy particles onto the surface of a continuously running steel strip from an injection nozzle placed at a position where the steel strip and a feed roll come into contact. (2) Equipped with a feeding mechanism that continuously runs the steel strip,
1. An apparatus for manufacturing a corrosion-resistant surface-treated steel sheet, characterized in that an injection nozzle for spraying metal or alloy particles onto a continuously running steel strip is arranged at a position where the steel strip and a feed roll come into contact.