Process for pickling metal sheet material

Abstract

The application discloses a kind of metal plate pickling process, including acid preparation, plate into pool, washing, flushing, air drying.Preferably including the spacer bar that is evenly arranged between upper and lower adjacent plate;Before plate is flushed one by one, it further includes using rotary brush to mechanically clean the surface of plate, and the surface of the rotary brush is evenly distributed with water outlet hole;Air dryer is arranged at the both sides of plate advancing direction, and the air outlet of the air dryer of both sides is staggered corresponding technology.Through the method, steel and other metals (such as titanium, nickel alloy, stainless steel metal plate) pickling can be guided, to the industrialization application of other metal pickling except steel at present, improve the development progress of the pickling process of other metal.And in the subsequent treatment after pickling, the method can further improve the pickling quality and the surface quality of plate by optimizing the process steps such as washing, drying.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal plate pickling, in particular to a process method for metal plate pickling. BACKGROUND

[0002] Pickling is a method for cleaning metal surface in industrial production by using acid solution to remove oxide scale and rust on the surface of workpiece (mostly steel material). After pickling, the surface passivation of the workpiece is improved, and the corrosion resistance of the workpiece surface is improved. The process flow of pickling operation currently generally includes preparation of acid solution, contact of workpiece with acid solution for pickling, washing after pickling, and inspection process after pickling.

[0003] In metal classification, steel is usually produced in large quantities in the field of industrial production, and its surface is easily oxidized to form an oxide scale layer, so pickling is an indispensable process, and the pickling process of steel is relatively mature, which is reflected in the control of acid solution suitable for steel material and process parameters. For other metals such as titanium and nickel, although they have better corrosion resistance than steel, they will still form an oxide layer on the surface in the normal environment. According to different requirements of subsequent use, the oxide layer on the surface usually needs to be removed. At present, there are few references for pickling of such metals, and there are still some constraints in pickling of such metals.

[0004] Different metals have different acid solution preparation and pickling processes during pickling, and the subsequent treatment of workpiece after pickling such as washing and drying also has a great influence on the quality of workpiece after pickling. For example, the residual acid solution after pickling will cause acid etching on the surface of the workpiece, resulting in unevenness of the surface of the workpiece, and for example, if the drying effect is not good during the drying process of the workpiece, water marks will be left on the surface of the workpiece, affecting the smoothness of the surface of the workpiece. SUMMARY

[0005] In view of the above problems, the present application aims to provide a process method for pickling of metal plates, which can provide technical support for pickling of steel and other metals, and further improve the pickling quality and the surface quality of the plates in the subsequent treatment after pickling.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a process method for pickling of metal plates, characterized in that it comprises the following steps:

[0007] S1, acid preparation

[0008] The composition of the acid solution is 4%-9% HF and 14%-20% HNO3; the acid solution ratio and pickling conditions of plates of different materials are shown in the following table:

[0009]

[0010] S2, the plate into the pool

[0011] The multiple plate is placed in the pickling tank after being hoisted and stacked for soaking;

[0012] S3, water washing

[0013] The pickled plate is hoisted and placed in the water tank to wash the acid liquid on the surface of the plate;

[0014] S4, flushing

[0015] The water washed plate is sequentially subjected to high pressure and low pressure flow flushing;

[0016] S5, air drying

[0017] The washed plate is air dried by an air dryer.

[0018] Preferably, in step S2, the adjacent plates are uniformly arranged with spacer rods.

[0019] Preferably, a driving column is arranged on the side wall corresponding to the rolling direction of the spacer rod and corresponding to the horizontal distance between the upper and lower plates.

[0020] Preferably, before the plate is sequentially washed, a rotating brush is used to mechanically clean the surface of the plate, and the surface of the rotating brush is uniformly provided with water outlets.

[0021] Preferably, the air dryer is arranged on both sides of the plate in the advancing direction, and the air dryer includes an air bellow, an air outlet is arranged on the side of the air bellow close to the plate along the length direction of the plate, and the air outlets of the air dryers on both sides are staggered corresponding.

[0022] The beneficial effects of the present application are: the method can provide guidance for steel and other metal (such as titanium, nickel alloy, stainless steel metal plate) pickling, and can be applied to the industrialization of pickling of other metals except steel, and can improve the development of pickling process of other metals.

[0023] And in the subsequent treatment after pickling, the method can further optimize the water washing and drying process steps to improve the pickling quality and the surface quality (clean and bright) of the plate. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The plate stacking diagram of the present application is shown.

[0025] Figure 2 The structure of A in the present application is enlarged. Figure 1

[0026] Figure 3 The top view structure diagram of the spacer rod of the present application is shown.​

[0027] Figure 4 The plate is hoisted into the pool.

[0028] Figure 5 The plate is hoisted into the pool. Figure 4 The plate is hoisted into the pool.

[0029] Figure 6 The plate is hoisted into the pool. Figure 5 The plate is hoisted into the pool.

[0030] Figure 7 The plate is hoisted into the pool. Figure 6 The plate is hoisted into the pool.

[0031] Figure 8 The plate is hoisted into the pool. The plate is hoisted into the pool.

[0032] The plate is hoisted into the pool. Figure 9 The plate is hoisted into the pool. The plate is hoisted into the pool.

[0033] The plate is hoisted into the pool. Figure 10 The plate is hoisted into the pool. The plate is hoisted into the pool.

[0034] The plate is hoisted into the pool. Figure 11 The plate is hoisted into the pool. Figure 5 The plate is hoisted into the pool. The plate is hoisted into the pool.

[0035] The plate is hoisted into the pool. Figure 12 The plate is hoisted into the pool. The plate is hoisted into the pool.

[0036] The plate is hoisted into the pool. Figure 13 The plate is hoisted into the pool. The plate is hoisted into the pool.

[0037] The plate is hoisted into the pool. Figure 14 The plate is hoisted into the pool. The plate is hoisted into the pool.

[0038] The plate is hoisted into the pool. Figure 15 The plate is hoisted into the pool. The plate is hoisted into the pool.

[0039] The plate is hoisted into the pool. Figure 16 The plate is hoisted into the pool. The plate is hoisted into the pool.

[0040] The plate is hoisted into the pool. DETAILED DESCRIPTION

[0041] In order to make the ordinary skilled in the art better understand the technical solutions of the present application, the technical solutions of the present application are further described below in combination with the drawings and examples.

[0042] Referring to the drawings Figures 1-16 The process method for acid washing of a metal plate comprises the following steps: The plate is hoisted into the pool.

[0043] S1, acid preparation

[0044] The acid solution is composed of 4%-9% HF and 14%-20% HNO3, and the acid solution ratio corresponding to different materials is preferably as follows:

[0045]

[0046]

[0047] S2, plate into the pool

[0048] After stacking multiple plates, they are hoisted and placed in the pickling tank for soaking. The pickling time and temperature of plates of different materials are preferably as shown in the above table.

[0049] When stacking multiple layers of plates, as shown in Figure 1 , a spacer rod 3 is evenly arranged between the upper and lower adjacent plates. By separating the upper and lower adjacent plates with the spacer rod 3, the acid solution can completely contact the upper and lower surfaces of each layer of plates, i.e., achieve sufficient pickling of the upper and lower surfaces of the plates, solve the defect that the acid solution cannot fully contact the plate surface when multiple layers of plates are directly contacted and stacked, and further achieve sufficient pickling of the plate surface by setting the spacer rod. The spacer rod is preferably made of an acid-resistant material, such as nylon.

[0050] To further reduce the problem of the spacer rod 3 affecting the full contact of the plate with the acid solution, preferably, as shown in Figures 2-3 , the spacer rod 3 is a cylindrical structure, an axial hole 3a is formed in it, and radial holes 3b passing through the circumferential hole are evenly distributed on the surface. Among them, the spacer rod 3 is immersed in the acid solution together with the plate, the acid solution can enter the axial hole from the corresponding (not in contact with the plate on the lateral position) radial hole, and then fill into the vertical radial hole in contact with the plate, so that the acid solution can contact the plate at the position where the spacer rod 3 contacts the plate, thereby further improving the full contact of the plate with the acid solution and reducing the problem of the spacer rod 3 blocking the plate surface at the contact position, improving the integrity of the plate pickling.

[0051] S3, water washing

[0052] The pickled plate is hoisted and placed in the water tank 1 to rinse the acid solution on the plate surface. Preferably, since the plate is hoisted by a sling (for easy and fast conversion between different process tanks), the water washing operation is to lower the multiple layers of plates in the hoisted state into the water tank, and to realize the water washing of the plate by swinging left and right (as shown in Figure 5 ) in the hoisted state. The impact of the water flow can improve the water washing effect and efficiency of the acid solution on the plate surface.

[0053] To further improve the washing effect of the board, such as Figure 5 As shown, a drive column 11 is installed on the side wall of the water tank 1, corresponding to the rolling direction of the partition rod 3 and horizontally aligned with the upper and lower partition plates. Its function is to wash the plates in the water tank by swinging them left and right during hoisting, thus removing acid from the surface of the plates. However, since the partition rod 3 is in contact with both the upper and lower plates, acid residue remains at these contact points, preventing sufficient removal by the water tank. Therefore... Figures 5-7 As shown, when the plate is swung left and right by hoisting, the ends of the upper and lower partition plates contact the drive column 11 on the inner wall of the pool. In this contact state, the upper and lower partition plates will move in the opposite direction to the plate in the middle layer (when the partition rod 3 is rolling), thereby exposing the position where the plate contacts the partition rod 3. This allows for a complete water washing operation at that position (limited by the hoisting belt when the plate is displaced), so as to thoroughly wash away the residual acid on the plate and avoid the continuous corrosive effect of the acid on the plate surface.

[0054] Meanwhile, when the plate rolls, the acid remaining in the axial perforation of the partition rod 3 can also be discharged through the water flow impact in the radial perforation, avoiding the disadvantage that the acid residue inside will still come into contact with the plate and corrode it in the later stage.

[0055] Before the next rinsing step, because residual water remains on the surface of the board, and this residual water also contains acid from the pickling process, and because a difficult-to-remove oxide layer and impurities will adhere to the surface of the board during the pickling process (the contact between the board and the acid cannot effectively remove these adhered oxide layers and impurities), in order to mechanically and completely remove the remaining oxide layer and impurities from the board surface, the boards are rinsed one by one before proceeding. Figures 9-10 The method also includes using a rotating brush 4 to mechanically clean the surface of the board, with water outlet holes 4a evenly distributed on the surface of the rotating brush 4. Specifically, the rotating brush 4 includes a housing 41 and a rotating brush body 42 rotatably disposed inside it, with the water outlet holes 4a evenly distributed on the rotating brush body. During operation, by holding the housing of the rotating brush 4, the rotating brush body is driven by a built-in motor to contact the surface of the board to achieve mechanical removal (the residual water on the surface of the board contains acid, which can dissolve and remove the oxide layer with a small amount of mechanical force, avoiding mechanical damage to the surface of the board when further removing the residual oxide layer). At the same time, the mechanically removed oxide layer is rinsed through the water outlet holes 4a, thereby further improving the smoothness of the board surface and improving the quality of the pickling process.

[0056] S4, Rinse

[0057] The surface-brushed plate is subjected to high-pressure and low-pressure flow flushing one by one, preferably in the following manner: the single plate is placed on the conveying roller and moved, and the high-pressure spray head and the low-pressure spray head are arranged in sequence on the two sides of the conveying roller, so that the residual water on the plate surface and the mechanical removed oxide layer and impurities are completely flushed and removed, and the cleanliness of the plate surface after pickling is achieved.

[0058] S5, air drying

[0059] The flushed plate is air-dried by an air dryer 2. Specifically, as shown in Figure 8 The air dryer 2 is arranged on both sides of the plate advancing direction, and the air dryer 2 includes an air box 21, an air outlet 22 is arranged on the side close to the plate and along the length direction of the plate, and the air outlets 22 of the air dryers 2 on both sides are staggered corresponding to each other.

[0060] Specifically, an electric heating wire (not shown in the figure) is arranged in the air box 21, and a fan 23 is arranged on the outside of the air box 21, which blows out the heat generated by the electric heating wire from each air outlet 22, and the blown hot air acts on the upper and lower surfaces of the plate (the center of the air outlet corresponds to the side wall of the plate, so that the blown hot air can act on the upper and lower surfaces of the plate), so that the residual water on the surface of the plate after flushing can be quickly dried, avoiding leaving marks on the plate surface.

[0061] The staggered air outlets 22 on both sides of the plate can further ensure the acting area of the hot air on the plate surface, so that the residual water on the plate surface can be fully blown away, and the blown water can be evaporated and dried more quickly, so that the plate surface can be quickly dried, and the residual water can be further avoided, and the surface smoothness of the plate after pickling can be improved.

[0062] The pickling method of the present application is as follows: a plurality of plates to be pickled are stacked with spacer rods arranged between adjacent plates, and then the stacked plates are hoisted and placed in a pickling tank with prepared acid solution for a certain period of time (determined according to the plate material and acid concentration); after pickling, the plates are hoisted into a water tank for water washing, during which the plates are shaken left and right by the hoisting belt, and the residual acid on the plate surface is flushed and removed by the impact of the water flow in the water tank, and at the same time, when the plates hit the driving columns on the inner wall of the water tank, the adjacent plates are offset left and right, and the spacer rods roll on the plate surface, so that the residual acid at the contact position between the plate and the spacer rod is removed, avoiding the residual acid on the plate surface.

[0063] After the water washing is completed, the residual oxide layer on the surface of the single plate is mechanically removed by the rotary brush 4, and the removed oxide layer is washed by the water flow of the water outlet hole 4a; after the washing, the plate is placed on the conveying roller and moved, high-pressure spray heads and low-pressure spray heads are arranged on both sides of the conveying roller in sequence, complete washing and removal of the residual water on the surface of the plate, the mechanically removed oxide layer and impurities are realized, and the cleanliness of the plate after pickling is realized.

[0064] Finally, the hot air blown by the air dryer 2 is used for air drying treatment of the plate, and the whole pickling treatment operation of the plate is completed.

[0065] The basic principle, main features and advantages of the present application are shown and described above. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A process for pickling a metal sheet material, characterized in that, The method comprises the following steps: S1, acid matching The acid liquid composition is 4%-9% HF and 14%-20% HNO3; S2, plate into the pool Multiple plates are stacked and placed in the pickling tank for soaking; In step S2, a spacer rod (3) is arranged between the upper and lower adjacent plates; the spacer rod (3) is a cylindrical structure, an axial hole (3a) is formed in it, and a radial hole (3b) penetrating the circumferential hole is uniformly distributed on the surface in a circumferential staggered manner; S3, water washing The pickled plate is hoisted and placed in the water tank (1) to wash the surface of the plate; a driving column (11) is arranged on the side wall of the water tank (1) corresponding to the rolling direction of the spacer rod (3) and horizontally corresponding to the upper and lower spaced plates; When the plate is hoisted and swung left and right, the end of the upper and lower spaced plates contacts the driving column (11) of the inner wall of the water tank. In this contact state, and in the rolling state of the spacer rod (3), the upper and lower spaced plates will realize opposite displacement with the middle interlayer plate, so as to expose the position of the plate contacting the spacer rod (3) to the outside, so that complete water washing operation can be realized at this position; S4, rinsing The washed plate is rinsed with high and low pressure flow one by one; S5, air drying The rinsed plate is air dried by an air dryer (2); The air dryer (2) is arranged on both sides of the plate advancing direction, the air dryer (2) comprises a wind box (21), an air outlet (22) is arranged on the side close to the plate and spaced along the length direction of the plate, and the air outlets (22) of the air dryers (2) on both sides are staggered corresponding.

2. The process of claim 1, wherein: Before the plate is rinsed one by one, a rotating brush (4) is used to mechanically clean the surface of the plate, and water outlets (4a) are uniformly distributed on the surface of the rotating brush (4).

Images