CN101429638B - Processing method for continuous hot-dipping galvanizing steel strip and apparatus used in the method - Google Patents
Processing method for continuous hot-dipping galvanizing steel strip and apparatus used in the method Download PDFInfo
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- CN101429638B CN101429638B CN200810244362XA CN200810244362A CN101429638B CN 101429638 B CN101429638 B CN 101429638B CN 200810244362X A CN200810244362X A CN 200810244362XA CN 200810244362 A CN200810244362 A CN 200810244362A CN 101429638 B CN101429638 B CN 101429638B
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Abstract
A processing method for a continuous hot dip galvanized steel strip belongs to the technical field of steel strip processing. The processing method comprises the steps of precleaning and hot dip galvanizing. The precleaning step comprises the procedures of alkali liquor spray, alkali liquor brushing, electrolytic degreasing, clean water brushing and cleaning water rinsing. The method is characterized in that a grinding cleaning procedure is added between the procedure of clean water brushing and the procedure of cleaning water rinsing. The method has the advantages that the corrosion-resisting performance of the continuous hot galvanized steep strip is improved; the procedure of grinding cleaning is a physical cleaning mode without chemical treatment, thereby not only protecting the environment, but also saving the processing cost of the steel strip; and a recommended device has a simple structure, and can neither bring about a redundant steel strip production line, nor improve the steel strip processing cost and the equipment cost.
Description
Technical field
The invention belongs to the steel band processing technique field, be specifically related to a kind of working method of continuous hot-dipping galvanizing steel strip, and relate to the used device of this method.
Background technology
Reason as industry is known in the course of processing of continuous hot-dipping galvanizing steel strip, includes steps such as pre-wash step and pot galvanize.The responsibility that pre-wash step is taken on is to remove greasy dirt, iron filings and the trifle in the world etc. that attach in steel strip surface, use making steel band, guarantee that overlay coating and steel band (also claiming substrate) have excellent sticking power obtaining to enter the pot galvanize step under the fully clean state in surface.Self-evident, the quality of pre-washing effect can directly exert an influence to the steel band after zinc-plated.At present, industry comprises as shown in Figure 6 to the employed operation of pre-wash step: alkali lye spray, alkali lye are scrubbed, electrolytic degreasing, clear water is scrubbed and the clear water rinsing.But, facts have proved that aforementioned operation is difficult to fundamentally to remove the oxide compound of steel strip surface, especially for the sort of with inhomogeneous state be dispersed in oxide compound in the micro-pit of steel strip surface and silicomanganese and be mingled with a little alloyed oxide.Therefore, when steel band enters when zinc-plated, these oxide compounds just can hinder the reaction of zinc and iron, are difficult to form intermediate phase, so zinc coating only is that to stick to steel band as the machinery be substrate surface, bonding force between the two is comparatively fragile.This Galvanized Steel Strip can expose the problem that influences work-ing life because of corrosion-resistant in the short period of time after being put to use.In recent years, people are harsh day by day to the technical indicator of Galvanized Steel Strip, in all technical indicators, salt spray resistance is of paramount importance performance assessment criteria, yet, because the salt-fog resistant time of present Galvanized Steel Strip only below 90h (white rust area 5%), thereby restricted the expansion of Galvanized Steel Strip purposes.
The applicant retrieves, search a kind of processing method that Chinese invention patent application number CN101078096A is introduced with the steel continuous hot galvanizing, the innovative point of method is that the clear water after pretreated caustic wash process has increased pickling process to remove the oxide compound on the steel band before scrubbing, but this method is not enough to reach the remarkable effect of improving the sticking power on zinc coating and steel band (substrate) surface equally, perhaps for this because of, the patent scheme does not disclose the salt-fog resistant test index of Galvanized Steel Strip.Especially, the pre-washing effect can be promoted to a certain extent, following drawback can be produced though the patent application scheme increases pickling process, the one, aggravation is polluted, and the 2nd, make the whole piece steel strip production line tediously long; The 3rd, improve running cost; The 4th, increase facility investment, therefore, practicality can be subjected to certain restriction.
In order to improve the corrosion resistance nature of hot-dip galvanized steel strip effectively, industry is all explored pre-wash step being devoted to, attempt to achieve the goal in suitable chemical treatment mode, for example make salt-fog resistant time reach 95h above (white rust area 5%), but do not see the report that success is arranged up to now.Present situation is, in some Application Areas, erosion resistance comparatively the ideal continuous hot-dipping galvanizing steel strip by external import.In view of this, be necessary to be innovated from the autonomous angle of CHINESE INDUSTRIES, technical scheme described below produces under this background.
Summary of the invention
Task of the present invention is to provide a kind of and is need not increase equipment and prolonging under the prerequisite of steel strip production line, and is improved the bonding force of zinc coating and steel strip surface significantly with non-chemically processing means and use the working method of the continuous hot-dipping galvanizing steel strip of embodiment ideal corrosion resistance nature.
Task of the present invention also is to provide a kind of used device of working method of continuous hot-dipping galvanizing steel strip, and this apparatus structure is simple and can ensure that zinc coating and steel strip surface have the effect that combines of described excellence.
Task of the present invention is finished like this, a kind of working method of continuous hot-dipping galvanizing steel strip, comprise pre-wash step and galvanizing step, the operation that pre-wash step comprises is: the alkali lye spray, alkali lye is scrubbed, electrolytic degreasing, clear water is scrubbed and the clear water rinsing, be characterised in that: scrub between operation and the described clear water rinsing process at described clear water and have additional the ground and cleaned operation, described ground and cleaned operation adopts as lower device, this device comprises that being installed in clear water scrubs and join paired at least one group first each other on the groove, the second ground and cleaned roller, the first ground and cleaned roller and the first driving mechanism transmission connect, the second ground and cleaned roller and the second driving mechanism transmission connect, wherein: be combined with first abrasive particle that is used for the surfacing of steel band by showing to reach on the roll body of the first ground and cleaned roller interiorly, and similarly be combined with second abrasive particle that is used for the surfacing of steel band on the roll body of the second ground and cleaned roller, the described first ground and cleaned roller is located at described clear water by a pair of adjustment mechanism and scrubs on the groove, a pair of adjustment mechanism respectively comprises movable axle bed arm, Accommodation cylinder and permanent seat, one end of movable axle bed arm is hinged on permanent seat, permanent seat is fixed on clear water and scrubs on the groove, the other end of movable axle bed arm constitutes free end and connects with the acting cylinder post of Accommodation cylinder, acting cylinder with plumbness be fixed on clear water and scrub on the groove, the end of the roll shaft of the described first ground and cleaned roller is supported on the bottom of movable axle bed arm rotationally by the clutch shaft bearing seat and occupy the middle part of movable axle bed arm after passing the adjustment groove that clear water scrubs on the groove to be offered, the material of the roll body of the described first ground and cleaned roller is to mix the polyurethane material that first abrasive particle is arranged, and the material of the roll body of the described second ground and cleaned roller is similarly and mixes the polyurethane material that second abrasive particle is arranged.
In another specific embodiment of the present invention, the size of described first, second abrasive particle is 20-60 μ m.
Go back in the specific embodiment of the present invention, the size of described first, second abrasive particle is 30-50 μ m.
In another specific embodiment of the present invention, the material of described first, second abrasive particle is an aluminium sesquioxide.
More of the present invention and in specific embodiment, described Accommodation cylinder is oil cylinder or cylinder.
In of the present invention and then specific embodiment, described first driving mechanism is installed in clear water and scrubs groove or be installed in and be disposed at clear water and scrub on the support of groove sidepiece, this first driving mechanism comprises first motor and first transmission shaft, one client link of first motor and first transmission shaft, the roll shaft of the other end of first transmission shaft and the first ground and cleaned roller connects.
In again of the present invention and then specific embodiment, described second driving mechanism is installed in clear water and scrubs groove or be installed in and be disposed at clear water and scrub on the support of groove sidepiece, this second driving mechanism comprises second motor and second transmission shaft, one client link of second motor and second transmission shaft, and the roll shaft of the other end of second transmission shaft and the second ground and cleaned roller connects.
The advantage of the technical scheme that the present invention recommended is: set up the ground and cleaned operation owing to the clear water in the prior art is scrubbed between operation and the clear water rinsing process, thereby will be dispersed in the oxide compound in the micro-depression of steel strip surface and/or the alloyed oxide of the assorted point of silicomanganese class unevenly removes by the ground and cleaned operation, for the desired combination of zinc coating in the subsequent step and steel strip surface provides guarantee, the corrosion resistance nature of resulting continuous hot galvanizing steel band is improved (salt-fog resistant test reaches more than the 95h); Because the ground and cleaned operation shows as the physics cleaning way of non-chemically handling, and therefore, not only can protect environment, and can save the tooling cost of steel band; The device of recommending simple in structure neither can make steel strip production line tediously long, also can not cause the raising of steel strip processing cost and the increase of facility investment.
Description of drawings
Fig. 1 is the process flow sheet of pre-wash step of the working method of continuous hot-dipping galvanizing steel strip of the present invention.
Fig. 2 is the structure iron of the used device of the working method of continuous hot-dipping galvanizing steel strip of the present invention.
Fig. 3 is the side-view of Fig. 2.
Fig. 4 is the cross-sectional view of the roll body of the second ground and cleaned roller shown in Figure 2.
Fig. 5 is the synoptic diagram of steel band between first, second ground and cleaned roller.
Fig. 6 is the process flow sheet of pre-wash step of the working method of the continuous hot-dipping galvanizing steel strip in the prior art.
Embodiment
Please be referring to Fig. 1, working method as the continuous hot-dipping galvanizing steel strip that the present invention recommended, comprise pre-wash step and galvanizing step, and pre-wash step comprises by operation shown in Figure 1: promptly alkali lye sprays, alkali lye is scrubbed, electrolytic degreasing, clear water is scrubbed, ground and cleaned and clear water rinsing, spraying through alkali lye successively, alkali lye is scrubbed, after electrolytic degreasing and clear water are scrubbed operation, basically most greasy dirts of steel strip surface have been removed, iron filings and loose foreign material such as oxide compound, but still be attached with the grey black spot that naked eyes can be seen in steel strip surface, thereby do not present the argenteous ideal glossy surface that has to people, if it is direct by follow-up clear water rinsing after clear water is scrubbed, so obviously, can not remedy aforesaid defective, therefore, after scrubbing, clear water make steel band enter the ground and cleaned operation that increases by technical scheme of the present invention, after the ground and cleaned operation, be put to the clear water rinsing again, thereby get so that be dispersed in the interior oxide compound of micro-pit of steel strip surface unevenly, the alloyed oxide of the assorted point of silicomanganese class is that aforesaid grey black mottle is removed.Only this through making zinc coating and steel strip surface show good bonding force behind follow-up galvanizing through the resulting steel band of clear water rinsing again after the ground and cleaned, can improve significantly to more than the 95h erosion resistance of Galvanized Steel Strip.
Please provide as the used device of the working method of continuous hot-dipping galvanizing steel strip of the present invention referring to Fig. 2, this device obviously is arranged on to be scrubbed used clear water by clear water shown in Figure 1 and scrubs groove 1 inside.More particularly, steel band successively through alkali lye spray groove alkali lye spray, alkali lye scrub that groove alkali lye is scrubbed, electrolytic degreasing bath electrolytic degreasing, clear water scrub the groove clear water and scrub and ground and cleaned and the rinsing of clear water rinse tank clear water, enters zinc-plated step then.
As a concrete embodiment, the device of being recommended comprise be installed in clear water scrub on the groove 1 join each other paired promptly constitute one group first, the second ground and cleaned roller 2,3, the first ground and cleaned roller 2 and 4 transmissions of first driving mechanism connect, first driving mechanism 4 comprises first motor 41 and first transmission shaft 42, first motor 41 both can be fixed on the side that clear water is scrubbed groove 1, also can first motor 41 be fixed on the support with the support that is equipped with separately, present embodiment is selected the latter, but do not illustrate support in the drawings, second terminal pad 421 of first terminal pad 411 on the motor shaft of first motor 41 and first transmission shaft, 42 1 ends connects, one client link of the roll shaft 22 of the other end of first transmission shaft 42 and the first ground and cleaned roller 2, and a pair of clutch shaft bearing seat 221 at the first ground and cleaned roller, 2 two ends is located on the adjustment mechanism 6, that is to say that the first ground and cleaned roller 2 is arranged at clear water by adjustment mechanism 6 and scrubs on the groove 1.Adjustment mechanism 6 comprises movable axle bed arm 61, Accommodation cylinder 62 and permanent seat 63, one end of movable axle bed arm 61 is hinged on the permanent seat 63 by first bearing pin 611, permanent seat 63 is fixed on clear water and scrubs on the outer wall of groove 1, the other end of movable axle bed arm 61 constitutes free end and by the acting cylinder post 621 hinge connection of second bearing pin 612 with Accommodation cylinder 62, second acting cylinder 62 with plumbness be fixed on clear water and scrub on the outer wall of groove 1.Along with the acting cylinder post 621 of Accommodation cylinder 62 stretches outside cylinder body or bounces back in cylinder body, then the free end of drive activity axle bed arm 61 is up or move down, thereby it is up or move down to take the first ground and cleaned roller 2 by movable axle bed arm 61, and promptly the roll shaft 22 of the first ground and cleaned roller 2 is scrubbed on the adjustment groove 11 on the groove 1 and made corresponding mobile being opened in clear water.The first ground and cleaned roller 2 up or move down the cornerite size that can make the steel band 7 between first, second ground and cleaned roller 2,3 and change.For Accommodation cylinder 62, both can select cylinder for use, also can select oil cylinder for use, present embodiment is selected oil cylinder for use.
The two ends of the roll shaft 32 of the second ground and cleaned roller 3 respectively are located at clear water rotationally by second bearing support 321 and scrub on the groove 1.One end of the roll shaft 32 of the second ground and cleaned roller 3 and second driving mechanism 5 are in transmission connection, and this second driving mechanism 5 comprises second motor 51 and second transmission shaft 52, for the same description to first motor 41 of the mounting means of second motor 52.The 4th terminal pad 521 of the 3rd terminal pad 511 on the motor shaft of second motor 51 and second transmission shaft, 52 1 ends connects, and the roll shaft 32 of the other end of second transmission shaft 52 and the second ground and cleaned roller 3 connects (by the terminal pad on the roll shaft 32).Under the work of first, second driving mechanism 4,5, drive first, second ground and cleaned roller 2,3 motions, and the sense of rotation of first, second ground and cleaned roller 2,3 is opposite.
Please be referring to Fig. 3, as known in the figure, the center of turning circle of a pair of first, second ground and cleaned roller 2,3 or title axle center are not to be on the same longitudinal center line, that is to say, slightly stagger in the position of the first ground and cleaned roller 2 and the second ground and cleaned roller 3, the cooperation of first, second ground and cleaned roller 2,3 can guarantee that steel band 7 is formed with cornerite when advancing, promptly be tending towards S shape or claim the corrugated mode of advancing, so that play ideal grinding effect steel band 7 surfaces by first, second ground and cleaned roller 2,3.
Please consult Fig. 4 and continue why only show the second ground and cleaned roller 3 in conjunction with Fig. 1 in Fig. 4, be because the structure of the first ground and cleaned roller 2 is consistent with it.As can see from Figure 1, material is by table and be combined with first abrasive particle 21 interiorly on the roll body of the first ground and cleaned roller 2 of urethane or similar material, from Fig. 1 and Fig. 4, can see, material is similarly on the roll body of the second ground and cleaned roller 3 of urethane or similar material by table and is combined with second abrasive particle 31 interiorly, when steel band 7 by way of first, the second ground and cleaned roller 2, in the time of between 3, then by first, second abrasive particle 21,31 grind the both side surface of steel band 7 respectively, and the oxide compound in the micro-pit on steel band 7 surfaces and/or the alloyed oxide of the assorted point of silicomanganese class are removed.Size for aforesaid first, second abrasive particle 21,31, being preferably 20-60 μ m, is 30-50 μ m preferably, is 40-45 μ m better, the material of first, second abrasive particle 21,31 is a silicates, for example aluminium sesquioxide or with the material of aluminium sesquioxide equivalent.
Please consult Fig. 5, in the present embodiment, first, second ground and cleaned roller 2,3 as the used device of the working method of continuous hot-dipping galvanizing steel strip has two groups, i.e. two first ground and cleaned rollers 2 and two second ground and cleaned rollers 3, the applicant adopts this Fig. 5, the group number that mainly shows the ground and cleaned roller can neither be subjected to restriction shown in Figure 2 according to needing increase and decrease, also is not subjected to the restriction of quantity shown in Figure 5.In addition, the signal from Fig. 5 can be clear that steel band 7 is tending towards S shape mode and advances towards the direction of carrying out the clear water rinsing for the clear water rinse tank.
As shown in the above description, because first, second ground and cleaned roller the 2, the 3rd, adopt the whippy material of polyurethanes and add that first, second abrasive particle 21,31 of mixing is formed, and the first clear water mixing roll 2 is closely contacted with steel band 7, the second ground and cleaned roller 3 is as the same, therefore steel band 7 is big with the contact surface of first, second ground and cleaned roller 2,3, make grinding comparatively even, although be the effect on surface, remove steel band 7 surface impurities rightly and can not undermine substrate.Simultaneously because under band regimen condition, work fully, between first, second ground and cleaned roller 2,3 and the steel band 7 water membrane is arranged, ultrafine particle under the mill will be washed away in time, thus can not cause the slag thing gather, influence grinding effect, can on substrate, not cause scuffing yet.
The applicant sketches principle of work of the present invention, make steel band 7 pass through the alkali lye spray in the mode identical with prior art, alkali lye is scrubbed, electrolytic degreasing and clear water are scrubbed the ground and cleaned operation that promptly enters the present invention after the operation and set up, specifically: steel band 7 promptly joins paired first each other through what dispose one group or two groups or more groups, the second ground and cleaned roller 2, in the time of between 3, just by first, the second ground and cleaned roller 2, the upper and lower surface ground and cleaned of 3 pairs of steel bands 7, the steel band 7 after the ground and cleaned that promptly passed through that row goes out after apparatus of the present invention enters the clear water rinsing process, supplies follow-up galvanizing step pot galvanize then.
The applicant compares test to 5 big coil of strips of raw material of same quality, wherein the steel band 7 of preceding half volume (five little reel numbers of finished product of the correspondence of being produced are 1A to 5A) of each volume is processed promptly by the inventive method and is processed by step shown in Figure 1, the steel band 7 of the later half volume of each volume (five little reel numbers of the correspondence of being produced are 1B to 5B) wherein processed promptly by the prior art method process by step shown in Figure 6, advance the unified salt-fog test of carrying out then, the time of record generation 5% area white rust is reviewed index as effect, and concrete result is by shown in the following table.
As can be seen from the above table, adopt grinding technics and do not adopt grinding technics to compare, can make average salt-fog resistant time bring up to 104.4 hours by 84 hours, increase rate is 24.3%.So method provided by the present invention is practical, the used device of method is an ideal.
Claims (7)
1. the working method of a continuous hot-dipping galvanizing steel strip, comprise pre-wash step and galvanizing step, the operation that pre-wash step comprises is: the alkali lye spray, alkali lye is scrubbed, electrolytic degreasing, clear water is scrubbed and the clear water rinsing, it is characterized in that: scrub between operation and the described clear water rinsing process at described clear water and have additional the ground and cleaned operation, described ground and cleaned operation adopts as lower device, this device comprises that being installed in clear water scrubs and join paired at least one group first each other on the groove (1), the second ground and cleaned roller (2,3), the first ground and cleaned roller (2) connects with first driving mechanism (4) transmission, the second ground and cleaned roller (3) connects with second driving mechanism (5) transmission, wherein: be combined with first abrasive particle (21) that is used for the surfacing of steel band by showing to reach on the roll body of the first ground and cleaned roller (2) interiorly, and similarly be combined with second abrasive particle (31) that is used for the surfacing of steel band on the roll body of the second ground and cleaned roller (3), the described first ground and cleaned roller (2) is located at described clear water by a pair of adjustment mechanism (6) and scrubs on the groove (1), a pair of adjustment mechanism (6) respectively comprises movable axle bed arm (61), Accommodation cylinder (62) and permanent seat (63), one end of movable axle bed arm (61) is hinged on permanent seat (63), permanent seat (63) is fixed on clear water and scrubs on the groove (1), the other end of movable axle bed arm (61) constitutes free end and connects with the acting cylinder post (621) of Accommodation cylinder (62), Accommodation cylinder (62) with plumbness be fixed on clear water and scrub on the groove (1), the middle part that adjustment groove (11) back of being offered on the groove (1) is supported on the bottom of movable axle bed arm (61) rotationally by clutch shaft bearing seat (221) and occupy movable axle bed arm (61) is scrubbed passing clear water in the end of the roll shaft (22) of the described first ground and cleaned roller (2), the material of the roll body of the described first ground and cleaned roller (2) is for to mix the polyurethane material that first abrasive particle (21) are arranged, and the material of the roll body of the described second ground and cleaned roller (3) is similarly and mixes the polyurethane material that second abrasive particle (31) are arranged.
2. the working method of continuous hot-dipping galvanizing steel strip according to claim 1, the size that it is characterized in that described first, second abrasive particle is 20-60 μ m.
3. the working method of continuous hot-dipping galvanizing steel strip according to claim 2, the size that it is characterized in that described first, second abrasive particle is 30-50 μ m.
4. according to the working method of claim 1 or 2 or 3 described continuous hot-dipping galvanizing steel strips, the material that it is characterized in that described first, second abrasive particle is an aluminium sesquioxide.
5. the working method of continuous hot-dipping galvanizing steel strip according to claim 1 is characterized in that described Accommodation cylinder (62) is oil cylinder or cylinder.
6. the working method of continuous hot-dipping galvanizing steel strip according to claim 1, it is characterized in that described first driving mechanism (4) is installed in clear water and scrubs groove (1) or be installed in and be disposed at clear water and scrub on the support of groove (1) sidepiece, this first driving mechanism (4) comprises first motor (41) and first transmission shaft (42), one client link of first motor (41) and first transmission shaft (42), the roll shaft (22) of the other end of first transmission shaft (42) and the first ground and cleaned roller (2) connects.
7. the working method of continuous hot-dipping galvanizing steel strip according to claim 1, it is characterized in that described second driving mechanism (5) is installed in clear water and scrubs groove (1) or be installed in and be disposed at clear water and scrub on the support of groove (1) sidepiece, this second driving mechanism (5) comprises second motor (51) and second transmission shaft (52), one client link of second motor (51) and second transmission shaft (52), and the roll shaft (32) of the other end of second transmission shaft (52) and the second ground and cleaned roller (3) connects.
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| CN200810244362XA CN101429638B (en) | 2008-11-28 | 2008-11-28 | Processing method for continuous hot-dipping galvanizing steel strip and apparatus used in the method |
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| CN102776460B (en) * | 2012-03-19 | 2013-12-04 | 江苏大力神科技股份有限公司 | Production method of thin steel strip hot galvanizing |
| CN104018088B (en) * | 2014-05-12 | 2016-05-11 | 盐城市鑫洋电热材料有限公司 | A kind of high-strength hot-dip galvanizing sheet steel and preparation method thereof |
| CN104404612A (en) * | 2014-11-26 | 2015-03-11 | 成都川硬合金材料有限责任公司 | Electrolytic cleaning process suitable for magnalium surface |
| CN105714366B (en) * | 2016-02-26 | 2017-12-05 | 安徽同益彩钢薄板科技有限公司 | A kind of efficient degreasing system of color steel surface |
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| TR202016190A2 (en) * | 2020-10-12 | 2021-01-21 | Borcelik Celik San Tic A S | PROCESS FOR COATING GALVANIZED SURFACES |
| CN112376008A (en) * | 2020-10-30 | 2021-02-19 | 姚天成 | Hot-rolled strip steel continuous hot galvanizing equipment |
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| CN114395746A (en) * | 2021-12-24 | 2022-04-26 | 安徽鑫科铜业有限公司 | High-quality surface treatment method for hot-dipped tin copper strip and hot-dipped tin copper strip |
| CN116103596B (en) * | 2023-04-04 | 2023-07-07 | 天津市宇润德金属制品有限公司 | Production process for coating steel coil |
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Application publication date: 20090513 Assignee: Jiangsu Cold-Rolled Technology Co., Ltd. Assignor: Changshu Huaye Plate Co., Ltd. Contract record no.: 2013320010138 Denomination of invention: Processing method for continuous hot-dipping galvanizing steel strip and apparatus used in the method Granted publication date: 20100901 License type: Exclusive License Record date: 20130813 |
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