JPH01298177A - Surface treatment of metallic sheet - Google Patents

Abstract

PURPOSE:To easily surface-treat a metallic sheet with good productivity by uniformly arranging metal powder on the metallic sheet surface, and rubbing the powder into the surface with a roll. CONSTITUTION:Metal powder 3 is supplied from a hopper 2 onto the surface of a steel sheet 1 traveling in direction of the arrow, and uniformly arranged. A metal such as zinc and nickel having a lower m.p. than the steel sheet 1 is used for the metal powder 3, and the particle diameter is appropriately controlled to about 0.01-100mu. The metal powder 3 is pressed by a roll 4 of ceramics, etc., and the roll 4 is rotated in the traveling direction of the steel sheet 1 or in the opposite direction at a velocity higher or lower than the traveling velocity of the steel sheet 1. By this method, the metal powder 3 is rubbed into the surface of the steel sheet 1 to form a mechanically alloyed layer. The alloyed layer is heated, as required, by a heater 5 such as plasma to improve its adhesion and denseness or cooled by a cooling nozzle 6, and then treated by a rolling machine 7 to flatten the surface.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for surface treatment of metal plates.

[Prior art and problems to be solved by the invention] As a treatment method for easily imparting corrosion resistance etc. to the surface of a metal plate, for example, metal powder is placed on the surface of the metal plate and then heated to remove all or It is known to form an alloy layer containing 1 part of
10, etc.).

In such surface treatment of a metal plate, heating for alloying treatment takes time, productivity is poor, and heat-induced deterioration of the metal base material may occur. Also, depending on the application, the flatness of the alloy layer surface is insufficient. Furthermore, when simply layering powder on a metal plate, it is necessary to layer the powder relatively thickly (approximately 500 μm or more) in order to obtain a homogeneous coating layer, and in such a case, there are disadvantages such as high costs. It is something.

The present invention has been made to advantageously solve these drawbacks.

[Means for Solving the Problems] The present invention is characterized in that metal powder is arranged on the surface of the metal plate, and the metal powder is rubbed onto the surface of the metal plate by a roll and adhered thereto. The present invention relates to a surface treatment method.

That is, in the present invention, the metal plate used is, for example, a steel plate, a copper plate, an aluminum plate, a stainless steel plate, etc., and one type of metal powder such as zinc, tin, nickel-based self-fusing alloy, aluminum, or titanium is applied to the surface of the metal plate. Or a mixture of two or more types of mixed metal powder or ceramic fine particles,
A material with a melting point equal to or lower than that of a metal plate can be used. Such metal powder may also be mixed with a binder such as a resin in order to facilitate arrangement (lamination).

The particle size of such metal powder is 0. O1 to 100μ is appropriate. If it exceeds 100μ, it may become difficult to rub and adhere to the metal plate surface using a subsequent roll.
Also 0. If O is less than 1μ, it may be unfavorable in handling the metal powder.

The arrangement of this metal powder on the surface of the metal plate has a relationship with the thickness of the rubbed layer, but for example, the thickness of the rubbed layer is 1.0 to 100 μm.
If so, the layers should be arranged to have a layer thickness of 10 to 500 μm.

After the metal powder is placed on the surface of the metal plate in this way, it is held down with a roll (for example, ceramic type is best), at a differential speed higher or lower than the moving speed of the metal plate, in the same direction as the moving direction of the metal plate. Or, it is rotated in the opposite direction to rub the metal powder onto the metal plate surface and adhere to it, and the pressing force of the roll is, for example, if the above-mentioned sharpened metal powder and layer thickness, and the thickness of the rubbed layer, the roll 0.1 to 50 non per unit length is sufficient. Also, as mentioned above, the difference in speed between the metal plate moving speed and the roll rotation speed (peripheral speed) is 1:2 to 1:200 (metal plate, roll rotation speed). or rolls/metal plates) is sufficient.

In this way, the metal powder can be rubbed onto the surface of the metal plate and used as a product, but if the surface is to be flattened, a light reduction rolling treatment of 0.1 to 5.0% is applied. Product.

When the metal powder is rubbed onto the surface of the metal plate, the metal powder and the metal plate surface form a mechanically alloyed layer due to the friction caused by the pressing force and differential speed of the rolls.

This alloyed layer is sufficient because the metal powder is finely pulverized during the rubbing process and mixed evenly and finely with the surface of the metal plate. It is heated in a heating furnace or the like to form a metal alloy layer, which improves adhesion, denseness, etc., and improves workability such as bending and cutting, and is used as a product. If it is necessary to flatten the surface, a light reduction rolling treatment of 0.1 to 5.0% is performed to produce a product.

In this way, even when alloying treatment is performed by heating, the alloying treatment is performed by rubbing in advance, and the alloying treatment can be done in a short time, which is advantageous in terms of productivity and cost, and has excellent corrosion resistance. It is possible to impart durability depending on the application, such as acid resistance, salt resistance, and alkali resistance.

Such surface treatment is applied to one or both sides of the metal plate depending on the intended use of the product.

Next, one embodiment of the present invention will be explained with reference to the drawings.

In the drawing, metal powder 3 is cut out from a feeder 2 and placed on the surface of a metal plate 1, and this metal powder is rubbed into the metal plate 1 by a roll 4, and then heated by a heater 5 if necessary. After heating, a cooling medium is sprayed from a cooling nozzle 6, and after cooling, a light reduction treatment is performed by a rolling mill 7.

[Example] Next, examples of the method of the present invention will be given.

↑1 Metal powder with a particle size of 05μ is used, and 1.0% (wt%) of resin is mixed as a binder.

Note 2. The roll has a diameter of 280 mm and is made of cast iron with ceramics (Au2(h) sprayed on the surface).

Note 3: Heating is by electric induction heating.

Note 4: Adhesion was determined by examining the peelability of the bent part after close bending (180° bending).

Note 5 = Corrosion resistance was determined by examining surface corrosion after immersion in a 5% sulfuric acid aqueous solution for 5 minutes.

[Effects of the Invention] The method of the present invention can easily and efficiently perform surface treatment, and can effectively impart durability depending on the application, such as corrosion resistance, acid resistance, salt resistance, and alkali resistance. This shows a significant effect.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of an embodiment of the method of the present invention. l... Steel plate 2... Hopper 3... Metal powder 4... Roll 5... Heater
6...Cooling nozzle 7...Rolling mill

Claims (1)

[Scope of Claims] 1. A metal powder is placed on the surface of a metal plate, and the metal powder is rubbed onto the surface of the metal plate using a roll to adhere.
Surface treatment method for metal plates. 2. The method for surface treatment of a metal plate according to claim 1, wherein the metal powder is rubbed onto the surface of the metal plate and then heat-treated. 3. The method for surface treatment of a metal plate according to claim 1, characterized in that after the metal powder is rubbed onto the surface of the metal plate and adhered thereto, the metal powder is lightly rolled down. 4. The method for surface treatment of a metal plate according to claim 2, characterized in that the metal powder is rubbed onto the surface of the metal plate to adhere thereto, then subjected to heat treatment, and then lightly rolled down.