CN1187480C - Method and apparatus for producing hot-rolled steel belt with electrolytic coating - Google Patents

Method and apparatus for producing hot-rolled steel belt with electrolytic coating Download PDF

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Publication number
CN1187480C
CN1187480C CNB991191099A CN99119109A CN1187480C CN 1187480 C CN1187480 C CN 1187480C CN B991191099 A CNB991191099 A CN B991191099A CN 99119109 A CN99119109 A CN 99119109A CN 1187480 C CN1187480 C CN 1187480C
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CN
China
Prior art keywords
pickling
plating
acid
steel band
agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB991191099A
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Chinese (zh)
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CN1251394A (en
Inventor
W·卡纳
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Andritz Patentverwaltungs GmbH
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Andritz Patentverwaltungs GmbH
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Publication of CN1251394A publication Critical patent/CN1251394A/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C23G1/081—Iron or steel solutions containing H2SO4
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

Hot-rolled strip in a single line is continuously fed into a chemical pickling section and then into a coating section provided with electrolytic cells. An Independent claim is also included for an installation which includes a chemical pickling section (2) joined in a single line to a coating section provided with electrolytic cells (10).

Description

Be used to make the method for the hot rolled strip of charged coating
The present invention relates to be used to make the method and apparatus of electroplating hot rolled strip.
In making the process of steel work, applying coating on finished product usually.Its main purpose is to make product anticorrosion.The coating that contains zinc or zinc alloy is most popular in the corrosion protection coating field, and still, (packing plate sector) also often uses the coating of stanniferous or chromium in the liner plate field.
In the continuous plating of steel band, two kinds of methods are very important:
Hot dip process; With
Electroplate.
In these two kinds of methods, used initial feed is a cold-rolled steel strip.This cold-rolled steel strip is processed in cold-rolling mill with thicker (being generally the 1.5-5 millimeter) hot-rolled steel sheet, wherein it is rolled to the final thickness of 0.3-2 millimeter.
Before cold rolling this hot-rolled steel sheet, need to remove the oxide skin of in course of hot rolling, separating out (oxide compound by various iron is formed, thickness is the upper layer of 5-20 micron).Normally in mineral acid such as sulfuric acid or hydrochloric acid, decompose this layer.This process is called pickling, and carries out in partial or continuous pickling installation.For example at AT399, a kind of such method is disclosed in 517.
Its objective is each independent processing step combination of will make in the steel band, to save equipment cost and to improve the quality of products.For example, the situation of prior art is that pickling and cold-rolling process are combined.
DE-PS 1 960 6305 C1 (Mannesmann) disclose the another kind of device that carries out hot rolling and pickling in an equipment.In described cold-rolled process, material hardens, and this effect must be eliminated (reversed) in annealing process subsequently.Annealing is carried out in batches in bell furnace or is carried out continuously in passing-type furnace.In galvanizing, will anneal and plating technic is combined in the tape handling equipment and carries out, wherein at first carry out annealing process, then in another step by immersing in the fused zinc with zinc layer coated steel strip.
With zinc and the other method of other metal deposition on steel band is to electroplate.In this case, with steel band, be generally that the annealed cold-rolled steel strip is pulled through the electrolyzer that contains the dissolved metal ion.This steel band connects with the negative pole (negative electrode) of rectifier by suitable manner, the metal anode and the opposed placement of this steel band that connect with rectifier anode simultaneously.By applying electric current at the two poles of the earth, metal ion is deposited on the steel band with the form of metal.This technology is for example disclosed in AT 373,922.Disclose another kind of different technology in EP 580,730 (SIKEL), this technology is particularly suitable for by chloride electrode deposition zinc alloy, because anode region is isolated by barrier film and cathodic area.
In in recent years, the manufacturing process of hot rolled strip has had remarkable development, and can directly make more and more thinner steel band in hot rolling technology.As a result, hot rolled strip can be used for a lot of application scenarios that before need be processed into cold-rolled steel strip.But, this also mean must be on hot rolled strip anticorrosive coating.Therefore JP 91258210 suggestions make the hot rolled strip scale removal in the dry type mode, then it are carried out hot dip process and handle.But this technology has some shortcoming, because dry type scale removal technology is expensive, and because no longer exists any binding site (this is an advantage for cold-rolled steel strip) of annealing and or immersion to need not hot rolled strip is annealed.
Therefore, the invention is characterized in hot rolled strip is infeeded the plating district that whole chemical acyls in a production line is washed district and assembling electrolyzer subsequently continuously.
A kind of favourable form of the present invention is characterised in that and makes steel band carry out rinsing in pickling with between electroplating.
The advantageous characteristic feature of the present invention structure is hydrochloric acid as pickling agent, with chloride electrolyte as the plating agent, but sulfuric acid also can be used as pickling agent, the vitriol ionogen also can be used as the plating agent.
A favourable form more of the present invention is characterised in that the iron-containing liquor that forms is used as the plating agent in acid cleaning process.
The advantageous characteristic feature of the present invention's structure is that the solution of discharging is used as Acidwash solution at least in a step of acid cleaning process from electrolyzer.
The invention still further relates to the device that is used to make galvanized hot rolled strip.It is characterized in that chemical pickling district and the plating district of containing electrolyzer are combined in the production line, wherein the chemical pickling district can be separated with electrolyzer by the rinsing district.
The advantage of present method is that these two kinds of technologies can be carried out in the aqueous solution of 50-90 ℃ of lower temperature.As a result, need not whole steel bands are heated to 300-500 ℃, this is save energy significantly.Electroplating in the method for coated steel strip in the manufacturing of routine, need quick pickling steel band mainly be to guarantee that coating can stick on the base material preferably as pre-treatment in acid always.In addition, routine techniques needs degreasing, because need in the intermediate steps process the steel band oiling to prevent any possible corrosion.In the method for the invention, these processing steps also can omit, because pickling and plating are (may by rinsing distinguish from) who and then carries out.The result has saved chemical reagent and has reduced the amount of the ejecta that is produced.Ferric sulfate that in acid cleaning process, forms or ferric chloride Solution (in any case, in process as after the cleaning step described in the AT 400,042) can be partly with the electrolytical source of iron that acts on deposit alloy coating such as zinc-iron alloys coating.The technology of this coating of plating for example is disclosed in AT397 in chloride electrolyte, in 663.
Below based on description of drawings the present invention, this description of drawings equipment of the present invention.
Untreated hot rolled strip 1 is sent into the chemical pickling district 2 that for example comprises two pickling tanks 3 and 4.In the steel band exit new acid solution 5 is added in the pickling district 2.Acid cleaning process shown here uses a kind of pickling reagent, still, all can use different acid in each pickling tank 3 and 4.Spent acid 6 is discharged in the steel band ingress, and enters sour cleaning step 7.Can bring spent acid solution 8 into the acid regeneration device, thereby can be used as eo-acid and add in the acid tank again.After chemical pickling 2, steel band 9 is cleaned removing sticking acid thereon in the rinsing district, and send into immediately afterwards and carry out plating in the plating tank 10, afterwards, the steel band 11 of plating leaves this equipment and for example is rolled into and coils.
Ionogen 12 is provided by the electrolytical dissolve area 13 of preparation.Thioether iron that produces in acid cleaning process or ferric chloride Solution 14 can add in this use and with zinc 15 after peracid cleaning step 7.
Embodiment
At the experimental installation that is used for the plated metal band, mainly comprise array apparatus down:
Abrollhaspel, skimming unit, pickling installation, zinc bath, the rinsing district, drying machine is around the volume machine
Use hot rolled strip thin, descaling, 300 millimeters of width of steel band, 1 millimeter of thickness.Do not use skimming unit.
Test 1:
Is that 90 ℃ the 20% vitriolic sulphuric acid soln that contains is handled hot rolled strip in the pickling district with temperature.In end, pickling district, use the water rinse steel band.The plating tank of vertical arrangement is equipped with and scribbles IrO 2Insoluble titanium anode.Electrolyzer contains the zinc sulfate ionogen, and pH value is 1.5, and temperature is 55 ℃.Each of 4 anodes (2 tops that are positioned at steel band, 2 bottoms that are arranged in steel band) all feeds 3000A.
Under 30 meters/minute belt speed, apply about 2 microns zinc layer.After leaving electrolyzer, dry then with the water rinse steel band.This product obtains uniformly and the finish plate of silver color.
In test subsequently, show that coating adheres to from the teeth outwards well.
Test 2:
In this test, be the hydrochloric acid soln pickling steel band of 80 ℃ concentration 16% with temperature.Steel band promptly carries out electro-galvanizing without any rinsing.These plating tanks are equipped with the banded zinc anode of solubility.Ionogen is that pH value is 3 liquor zinci chloridi.Although have the iron level of about 5g/l, still deposit pure zinc layer.Surface even also brighter than the coating that forms by the vitriol ionogen.The adhesivity that detects this coating is fine.Metallographicobservation shows that also cleanup acid treatment is completely, does not detect remaining oxide skin.
Test 3:
In this test, the pickling district uses hydrochloric acid, and approximately contains 100g/lFe, 60g/lHCl, and total chloride 190g/l will pump into the dissolve area that contains mossy zinc from the solution in pickling district.
After dissolution process, remaining hydrochloric acid consumes in decomposing zinc.The solution that is provided has following ingredients: 100g/lFe, 54g/lZn, muriate 190g/l.This solution is used as ionogen at electroplating region.This electrolyzer is equipped with insoluble anode and barrier film.By applying electric current, the layer of deposition zinc and iron on steel band.The content that analysis draws iron in this layer is 11-13%.
In the later stage of test, the solution that will take from the plating tank infeeds the pickling district.This shows that the free acid that forms in the electro-galvanizing district can be used for the dissolved oxygen skin.

Claims (5)

1 is used to make the method for the hot rolled strip of charged coating, it is characterized in that the hot rolled strip that will have the oxidation cortex sends into all chemical pickling districts in a production line continuously, wherein this oxidation cortex is all removed, send into the plating district that directly has electrolyzer in the downstream then, wherein the iron-containing liquor that will form in acid cleaning process is as the plating agent.
2,, it is characterized in that steel band carries out rinsing in pickling with between electroplating according to the method for claim 1.
3, according to the method for claim 1, it is characterized in that hydrochloric acid is used as pickling agent, chloride electrolyte is as the plating agent.
4, according to the method for claim 1, it is characterized in that sulfuric acid is used as pickling agent, the vitriol ionogen is as the plating agent.
5,, it is characterized in that a step of acid cleaning process, being used as Acidwash solution at least from the solution that electrolyzer is discharged according to arbitrary method of claim 1-4.
CNB991191099A 1998-07-31 1999-07-30 Method and apparatus for producing hot-rolled steel belt with electrolytic coating Expired - Fee Related CN1187480C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0131998A AT406487B (en) 1998-07-31 1998-07-31 METHOD AND SYSTEM FOR PRODUCING AN ELECTROLYTICALLY COATED HOT RIBBON
ATA1319/1998 1998-07-31
ATA1319/98 1998-07-31

Publications (2)

Publication Number Publication Date
CN1251394A CN1251394A (en) 2000-04-26
CN1187480C true CN1187480C (en) 2005-02-02

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CNB991191099A Expired - Fee Related CN1187480C (en) 1998-07-31 1999-07-30 Method and apparatus for producing hot-rolled steel belt with electrolytic coating

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KR (1) KR20000011280A (en)
CN (1) CN1187480C (en)
AT (1) AT406487B (en)
BE (1) BE1012146A5 (en)
DE (1) DE19926102B9 (en)
FR (1) FR2781704B1 (en)
TW (1) TW585937B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103088354B (en) * 2011-10-31 2014-12-24 上海宝信软件股份有限公司 Control method for eliminating strip steel bending-crease defect
DE102016223743A1 (en) * 2016-05-25 2017-11-30 Sms Group Gmbh Process and installation for coating a scale hot strip
CN110831344B (en) * 2019-11-20 2021-07-13 江苏上达半导体有限公司 Use method of device universal for first tin melting and second tin melting

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55110796A (en) * 1979-02-15 1980-08-26 Sumitomo Metal Ind Ltd Continuous alloy electroplating method
JPS58181889A (en) * 1982-04-17 1983-10-24 Nippon Steel Corp Preparation of single surface zinc electroplated steel plate
ES8607426A1 (en) * 1984-11-28 1986-06-16 Kawasaki Steel Co High corrosion resistance composite plated steel strip and method for making.
JPS61147900A (en) * 1984-12-20 1986-07-05 Hitachi Ltd Method and installation for continuous electroplating of steel strip
JPS61190100A (en) * 1985-02-18 1986-08-23 Nippon Steel Corp Continuous electrolytic treatment installation for steel sheet
US4885215A (en) * 1986-10-01 1989-12-05 Kawasaki Steel Corp. Zn-coated stainless steel welded pipe
KR960012112B1 (en) * 1992-12-30 1996-09-12 박득표 Process for the preparation of ferrous chloride aqueous solution
JPH08325790A (en) * 1995-05-31 1996-12-10 Nippon Steel Corp Equipment for production of electrogalvanized hot rolled sheet having excellent lubricity
KR0151540B1 (en) * 1995-07-21 1998-11-16 윤철곤 Apparatus for zn-coating the thin and thick steel sheet simultaneously
JPH11106985A (en) * 1997-10-07 1999-04-20 Kawasaki Steel Corp Electric plating method of hot-rolled steel sheet with scale

Also Published As

Publication number Publication date
FR2781704B1 (en) 2000-10-13
DE19926102B9 (en) 2005-05-19
KR20000011280A (en) 2000-02-25
FR2781704A1 (en) 2000-02-04
BE1012146A5 (en) 2000-05-02
AT406487B (en) 2000-05-25
TW585937B (en) 2004-05-01
ATA131998A (en) 1999-10-15
CN1251394A (en) 2000-04-26
DE19926102A1 (en) 2000-02-03
DE19926102B4 (en) 2005-01-27

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