JPS61153284A - Method and device for surface treatment of metallic material having hardly wettable surface - Google Patents

Abstract

PURPOSE:To improve the wettability of the surface of a metallic sheet and to execute uniformly a surface treatment by a treating liquid by passing the metallic sheet having the hardly wettable surface through high-hardness lapping bodies in contact therewith by such backup devices which exert the uniform face pressure to the metallic sheet in the transverse direction thereof. CONSTITUTION:The thin metallic sheet 6 which is the amorphous silicon steel strip or the like having a silicon oxide on the surface and which is not good in wettability is passed between two pieces of 3-4 stages of the lapping bodies 1 and 1 while the surface treating liquid is coated thereon. The bodies 1 are manufactured of glass, metal, alloy or ceramics having the corrosion resistance to the surface treating liquid and are pressurized by the backup devices 2 having a weight 3, etc. The surface treating liquid which is phosphate, chromate and phosphate mixture, etc., is coated on the strip 6 before, during or just after the passage of said strip between the bodies 1, by which the wettability of the surface of the strip 6 having the hard wettability is uniformly improved. The subsequent surface treatment is thus made uniform and easy.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to a metal material having a hard-to-wet surface by rubbing it in the width direction of a metal material with a surface of sufficient hardness to remove the hard-to-wet surface. This invention relates to a method and apparatus for surface treatment of metal materials having a hard-to-wet surface, which promotes reaction with a surface treatment liquid by passing the metal material through contact while equalizing blood pressure, and obtains a desired surface treatment film in a very short time. be.

(Prior Art) In order to serve the same purpose, the present inventors first developed a surface treatment device equipped with a sliding body made of a non-rotating rod-shaped body in the 1970s.
It was proposed in the specification of No. 8-115537 (hereinafter referred to as the prior invention). The present invention relates to improvements in ensuring uniformity of blood pressure in the width direction of the plate, preventing local wear of the sliding member, and controlling the amount of adhesion thereby.

When applying chromic acid, phosphate, or a chromic acid phosphate mixed treatment solution to a metal material with a hard-to-wet surface, such as an amorphous magnetic alloy thin plate, and drying or baking, the applied treatment solution or the Since it is baked, it is necessary to apply the processing liquid evenly.

In particular, the surface of an amorphous magnetic alloy thin plate is covered with dense silicon oxide, etc., and has poor wettability depending on the processing liquid. Therefore, with a normal aqueous treatment liquid, the treatment liquid is repelled and a uniform surface treatment cannot be achieved. Conventionally, measures have been taken to improve wettability in terms of pretreatment of steel sheets and treatment solutions. Countermeasures include methods of lowering the surface tension of the treatment liquid, methods of increasing the corrosivity of the treatment liquid, and methods of increasing the activity of the plate surface.

Specifically, methods include using a bath containing a surfactant or organic solvent, increasing the concentration of acid components or increasing the temperature to increase the corrosivity of the treatment solution, and performing pickling as a pretreatment. etc. However, although these methods improve wettability, they have the drawbacks of shortening the life of the bath and complicating the process.

Of course, if there is oil or fat on the surface, it is necessary to thoroughly degrease it in advance.

Rotating rubber rolls are usually used to apply or squeeze the treatment liquid, but for thin steel strips with a thickness of 100 μm or less,
The edge is like a razor blade and easily bites into the roll, causing damage.

Furthermore, when using the drawing silol method, there is very little effect of promoting the reaction between the treatment liquid and the thin steel strip.

However, in the process of the invention of the prior application, rod-shaped bodies made of glass, ceramics, stainless steel, superalloy, etc., which have hard surfaces and are difficult to be affected by the treatment liquid, are pressed against each other so as not to rotate, and the space between them has already been treated. We have discovered that passing a thin steel strip in contact with liquid has the following effects.

(1) Before passing between the two pressed rods, the treatment liquid dropped only on the upper surface of the steel strip will rise due to capillary action in the gap between the rods and the plate, no matter where it is dropped. It is applied uniformly not only to the middle of the front surface but also to the back surface at the same time.

(2) When a film is formed by a chemical reaction with the steel plate surface, such as with a phosphate or chromic acid phosphate mixed treatment solution, the chemical reaction is promoted by the friction between the rod and the steel plate surface, making it easier to form the film. become.

(3) By changing the concentration of the treatment liquid applied,
The amount of application can be controlled appropriately.

(Problems to be Solved by the Invention) A surface treatment film can be applied to a metal material having a hard-to-wet surface, such as a thin steel strip such as an amorphous magnetic alloy thin plate, so that it can be passed uniformly, at high speed, and in large quantities. In order to apply the invention, it has been found that the device devised by the prior application described above has the following problems.

(1) When a rod-shaped body is passed through contact with a thin steel strip, the ends of the rod-shaped body are supported under pressure, and when pressure is applied, the rod-shaped body bends, and high pressure is applied only to the ends of the rod-shaped body, and the center part A weak surface pressure is applied to the surface of the rod.Therefore, it has an adverse effect on the uniformity of the treated film, the reactivity of the treatment liquid and the thin steel strip, the threadability of the thin steel strip, and the local wear of the rod. appear.

(2) The rod-shaped body pressed in a non-rotating state comes into contact with the thin steel strip and is rubbed, which causes the contact part of the rod-shaped body to wear out, which causes an increase in the amount of surface treatment film deposited and unevenness. Not suitable for high-speed mass threading.

(3) Due to the capillary phenomenon in the gap between the rod-shaped body pressed in a non-rotating state and the thin steel strip, the surface treatment liquid dropped on the top surface of the thin steel strip goes around to the back surface, and the surface treatment liquid is applied to both sides at the same time. Although it is possible to apply the coating, when it comes to high-speed threading and wide-width materials, the difference in the amount of coating between the edges and the center becomes large. Also, it may not completely go around the back side.

(Another Means to Solve the Problems) The gist of the present invention is to bring a metal material having a hard-to-wet surface into contact with a rotating rubbing member having a surface of sufficient hardness to remove the material surface by rubbing. In addition, a surface treatment liquid is applied to the surface of the metal material either before, simultaneously with, or immediately after the material surface comes into contact with the rubbing body, or a combination thereof. A method for surface treatment of a metal material comprising: a rubbing body having a surface of sufficient hardness to rub a hard-to-wet surface; a backup device for equalizing blood pressure in the width direction of the rubbing body; This is a surface treatment device for hard-to-wet metal materials whose main structure is a mechanism for bringing a metal band into contact with and passing through a rubbing body.

Hereinafter, the present invention will be explained in detail based on the drawings.

In FIG. 1, the sliding body 1 is held down by a backup device 2 that applies the blood pressure of the sliding body 1 housed in a metal frame 4 uniformly, and a thin steel strip 6 is inserted between the sliding bodies. This is a device that performs surface treatment on metal materials that have difficult-to-wet surfaces by allowing the material to pass through contact with the material.

In this example, the thin steel strip 6 moves horizontally from the left side to the right side, but the thin steel strip 6 moves horizontally from the left side to the right side. If the treatment liquid is supplied by immersion in a surface treatment liquid such as liquid, or by dropping or spraying the surface treatment liquid, the surface of the metal material with a hard-to-wet surface can be easily passed through contact with the rubbing body. Reactivity is increased and surface treatment is applied.

In the case of Fig. 1 a, the backup device is loaded with its own weight and the weight 3 is placed on the backup device; in the case of b, a spring type that is compressed by a spring 9; and in the case of C, a set of air cylinders that are compressed by a cylinder 10. In the case of , d, this is a quick-up device that has cylinders 10 on the top and bottom and has a quick-open mechanism that makes it easy to thread the thin steel strip when starting threading. Determined by conditions such as quantity.

FIG. 3 shows an example in which a liquid leveling jig 7 is provided for application to high-speed sheet passing and wide-width materials. A simple structure consisting of flat plates combined to provide a slight clearance is shown, and b is a structure having a liquid supply port 8. The size of the clearance is adjusted so that the liquid leveling jig is filled with the processing liquid.

Furthermore, FIG. 5 shows that only one of the upper and lower sides of the passing material is in contact with the sliding member 1, and the rotating roll 1 is sandwiched between the metal material 6.
1 shows an example in which two sets of sliding body stands are arranged facing each other. As described above, in the present invention, the sliding members can be placed not only on both sides of the metal material, but also on one side.

The number of passes of the sliding member is determined by looking at the passing conditions and the condition of the treated film, but the effect will be more enhanced if it is used not only in one pass but in two or more passes in parallel. Normally, three passes are sufficient to achieve the objective.

The shape of the rubbing body used in the present invention may be circular or polygonal. Further, when a polygonal rubbing body is used, the position where it contacts the thin steel strip may be anywhere, such as the vertex or the side of the polygon. However, when using it on the side, if the contact surface is large, the friction with the thin steel strip will be large and there is a risk of cutting the thin steel strip.
In that case, it is preferable to make contact at the vertices of the polygon.

Further, the surface of the rubbing body may be smooth or may be roughened to increase the amount of adhesion. Further, when using a circular sliding member, the diameter is preferably 5 to 20 mmφ. 5 m
If it is less than mφ, there is a high risk of breakage, and if it is 20 mmφ or more, the control accuracy of the adhesion amount will be poor.

The placement position of the upper and lower sliding elements should be such that the centers of the sliding elements are aligned at the upper and lower positions, or the reactivity between the thin steel strip and the liquid must be controlled, which is best when viewed from the perspective of the processing liquid. If this occurs, the center may be shifted.

FIG. 2 shows an example in which the sliding body is connected to a rotating machine in order to rotate it. The rotational speed and direction of the sliding member are determined by the threading speed of the thin steel strip, the uniformity of the coating, and the amount of coating. or,
Only one of the sliding members may be rotated, or both rotating machines may be made independent and the rotation speed may be changed, or the upper and lower sliding members may be rotated simultaneously, and the rotation may be continuous or intermittent. But that's fine.

(Function) Various backup devices are used to uniformly apply surface pressure across the width of metal materials that have a hard-to-wet surface. By passing the strip in contact with the thin steel strip, the local wear of the rubbing body in contact with the thin steel strip is made uniform, which improves the uniformity of the surface treatment film, the reactivity of the treatment liquid and the thin steel strip, and the improvement of the thin steel strip. The threadability of the belt is improved.

In addition, when the sliding member is pressed in a non-rotating state and passed through contact, only the contact surface is worn. However, by rotating the sliding member, the contact surface wears out evenly in the circumferential direction of the sliding member, increasing the throughput of threading, making it suitable for high-speed, large-volume threading.

(Example) Next, an example will be given and explained.

As a metal material having a difficult-to-wet outer surface, a composition manufactured by a single roll method, Fe'80.5 8in6.5 B:1
2O:1 (wt%), average plate thickness 1μm, plate width 100m
As shown in Fig. 1a, three pairs of glass sliding bodies each having a diameter of 8 mmφ are placed on an amorphous magnetic alloy thin plate of 10 mm, and a surface pressure is applied to the upper part of the upper sliding body. A 400 t weight was placed on the plate so that the weight was uniform across the width of the plate.

The surface treatment was carried out by dropping a chromic acid phosphate mixture onto the surface of the amorphous magnetic alloy thin plate before it passed through the coarse-grained upper and lower sliding members, and at a threading speed of 10 m/-. went. Since the sliding member passes through contact with the amorphous alloy thin plate, the contact portions are worn, and the amount of wear increases with the amount of plate passing.

Here, if the amount of wear of the non-rotating sliding member in contact with the thin steel strip is F, then as shown in Fig. 4, the amount of wear (F] = Length of wear in the width direction of the sliding member - ×During wear in the passing direction of the thin steel strip (indicated by Hl, length of wear + L), depending on the width of the plate to be passed through and the meandering of the plate, l”t shows approximately a constant value, but during wear ( The degree of wear changes depending on the amount of plate threading, so the degree of wear can be determined by comparing the plates during wear.

Therefore, Table 1 shows a comparison of the amount of adhesion during wear (H) of the sliding member when a 400 m long thin steel strip is passed through it, and the amount of adhesion when pressure is applied only to the ends. The amount of adhesion was determined by peeling off the film and calculating the difference in weight.

Table 1 C: Center part DS when viewed from the side of the equipment; Back side when viewed from the side of the equipment According to Table 1, when pressure is applied to both ends of the sliding body, the sliding body bends and only the ends of the thin steel strip are bent. High pressure is applied,
A weak pressure is applied to the central part.

For this reason, the amount of wear at both ends is greater than that at the center, causing unevenness in the amount of adhesion in the board width direction.

On the other hand, by adding a backup device that makes the surface pressure uniform in the width direction of the sliding body, the sliding body will wear uniformly in the width direction, and the amount of adhesion in the width direction will also become more uniform. To increase.

Example 2 Under the conditions of Example 1, when the sliding members are pressed against each other in a non-rotating state, when the plate is passed through a length of 1.2 km, the upper and lower sliding members are perpendicular to the contact surface of the thin steel strip. It was worn by 40 μm.

For this reason, a thin steel strip with a thickness of 30 μm has the effect of increasing the reactivity between the liquid and the thin steel strip, since it is difficult to remove the rubbing from the hard-to-wet outer surface just by passing between the upper and lower rubbing bodies. At the same time, the controllability of the adhesion amount also deteriorates.

Isotropically, the sliding body is 1 rPni in the opposite direction to the threading direction.
2. When a material with a length of 1.2 km is passed through one rotation,
The diameters of the upper and lower rubbing bodies each decreased by only 2 caps, and the reactivity between the thin steel strip and the liquid and the controllability of the amount of adhesion were also good.

Example 3 Glass, stainless steel, hard stainless steel, and zirconia with a diameter of 8 mm were used under the conditions of Example 1, and 40 mm of thin steel strip was used.
During wear of the rubbing body when passing through 0m (Table 2 shows the number of sheets and the amount of adhesion)
Shown below.

Table 2 According to Table 2, there are some differences in the wear rate depending on the material of the sliding body, but it is important that it has a hardened surface that can rub off difficult-to-wet surfaces, and that has corrosion resistance against surface treatment liquids. It can be seen that there is no relation to the amount of adhesion.

(Effect of the invention) As explained above, the surface pressure in the width direction of the plate is uniformly applied to the rubbing body which has a surface hard enough to rub off the hard-to-wet outer surface and is corrosion resistant to the processing liquid. By attaching a backup device such as the following and passing it through contact with the thin steel strip, the uniformity of the treated film, the reactivity of the treatment liquid and the thin steel strip, and the threadability of the thin steel strip are improved. Also, by rotating the sliding member, it is suitable for high-speed, large-volume threading.

[Brief explanation of drawings]

FIG. 1 is a side view of the present invention, and FIG. 2 is a front view of the present invention (
a), side view (b), and FIG. 3 are side views of other examples of the present invention, FIG. 4 is a schematic diagram showing the state of wear of the sliding body, and FIG. 5 is another example of the present invention. FIG. 1: Sliding body 2: Rose-up device 3: Weight 4: Frame 6: Steel strip 10 Nijilinda No. W

Claims (1)

[Scope of Claims] 1. A metal material having a hard-to-wet surface is brought into contact with a rotating sliding member having a surface of sufficient hardness to remove the surface of the material by rubbing, and the surface of the material is brought into contact with the sliding member. A method for surface treatment of a metal material having a hardly wettable surface, characterized in that a surface treatment liquid is applied to the surface of the metal material either before, simultaneously with, or immediately after contact with the metal material, or a combination thereof. 2. A sliding member having a surface with sufficient hardness to remove a hard-to-wet surface, a backup device that equalizes the surface pressure in the width direction of the sliding member, and a metal band on the sliding member. A surface treatment device for hard-to-wet metal materials whose main component is a mechanism that allows contact and passage. 3. The surface material of the sliding body has the hardly wettable surface as set forth in claim 2, which is made of any one of glass, metal, non-ferrous metal, alloy, and ceramic that is corrosion resistant to the surface treatment liquid. Surface treatment equipment for metal materials.