EP0235595A2 - Procédé, installation et dispositif de dégraissage et de nettoyage en continu de bandes de métaux, en particulier de bandes d'acier laminées à froid - Google Patents

Procédé, installation et dispositif de dégraissage et de nettoyage en continu de bandes de métaux, en particulier de bandes d'acier laminées à froid Download PDF

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Publication number
EP0235595A2
EP0235595A2 EP87101407A EP87101407A EP0235595A2 EP 0235595 A2 EP0235595 A2 EP 0235595A2 EP 87101407 A EP87101407 A EP 87101407A EP 87101407 A EP87101407 A EP 87101407A EP 0235595 A2 EP0235595 A2 EP 0235595A2
Authority
EP
European Patent Office
Prior art keywords
cleaning
electrolysis
mechanical
unit
electrolytic
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.)
Withdrawn
Application number
EP87101407A
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German (de)
English (en)
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EP0235595A3 (fr
Inventor
Horst Gollnick
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoesch Stahl AG
Original Assignee
Hoesch Stahl AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hoesch Stahl AG filed Critical Hoesch Stahl AG
Publication of EP0235595A2 publication Critical patent/EP0235595A2/fr
Publication of EP0235595A3 publication Critical patent/EP0235595A3/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating

Definitions

  • the invention relates to a method for the continuous degreasing and cleaning of the surface of metal strips, in particular cold-rolled steel strip by means of an electrolytic and mechanical treatment, and to a system and device for carrying out the method.
  • a clean metallic surface on the finished belt is a prerequisite for perfectly adhering metallic or non-metallic coatings, such as are used, for example, to improve corrosion resistance in the form of thin zinc or tin coatings.
  • metallic or non-metallic coatings such as are used, for example, to improve corrosion resistance in the form of thin zinc or tin coatings.
  • the surface is not cleaned before annealing, so that carbon or carbon-containing residues and iron abrasion are still present after the annealing treatment.
  • belt processing can be carried out during processing.
  • the palm fat residues and the iron abrasion must be removed before the annealing treatment so that the strip surface has the surface properties required for the subsequent treatment. If palm fat remains on the belt during the annealing process, crack products would form which would then not be sufficiently removed.
  • the effective belt speeds which used to be in the order of 5 to 30 m / min, were increased to speeds in the order of 100 to 800 m / min, depending on the thickness of the belt.
  • the current supplied to an electrolysis plant is expressed by the current density in A / dm 2 and the amount of current in A s / dm 2 or also C / dm 2 . Both terms are connected by the equation:
  • the strips which are delivered dirty from the cold rolling mill in rings, to first undergo an alkaline spray and dip degreasing and then to be brushed. This step removes most of the residues on the surface of the strip, while the fat layer should be torn open to increase the effect of the subsequent electrolysis process.
  • this mechanical cleaning by means of machine brushing or the high-pressure flushing which acts in a similar manner to the first electrolysis treatment is to be omitted.
  • the polarity of the electrodes is changed in each electrolysis cell in such a way that the direction of the current perpendicular to the strip surface changes several times when passing through an electrolysis cell.
  • each point on the strip surface is flowed through several times in an alternating current direction.
  • each electrolysis cell there is no change in polarity in each electrolysis cell, so that all electrodes within a cleaning cell have the same polarity.
  • all points on the tape surface regardless of which side of the tape they are on, have the same polarity. If the electrodes are all switched positive, the surface of the strip acts as a negative pole - or vice versa.
  • Another embodiment according to the invention can consist in that in an electrolysis cell all electrodes on one side of the strip are positive and all electrodes arranged on the opposite side are switched negative - or vice versa.
  • This rule according to the invention also applies to pre-degreasing, in which the first electrolysis is carried out without changing the polarity - and then.
  • according to the teaching mentioned under a) and b) can also be equipped with a rotating brush device, if necessary, in the same electrolytic cell.
  • the current density can be increased by applying a higher DC voltage between the electrode and the strip surface.
  • the amount of electricity supplied to each surface unit in As / dm 2 or Coulomb (abbreviated C) is just as important for the cleaning success as for the cleaning costs; it results from the relationship
  • Electrolysis time (s) accumulated length of all electrodes passed in the direction of the strip (1) strip speed m / s
  • the current density is also reduced from the current values to low values of 0.8 to 4 C / dm 2, even in the case of fast-running metal strips, that is to say with electrolysis times in the range of seconds.
  • the relative amount of current is limited to values of 0.8-4 C / dm 2 , depending on the type and adhesive strength of the contaminants.
  • the invention accordingly significantly reduces the power consumption and, as a result, the cost of the degreasing required as the relative amount of electricity is reduced and the surface cleanliness of the belt is improved.
  • Another advantageous method and device variant consists in the spatial assignment of the electrodes arranged in the electrolysis bath to the brushing machines.
  • the distance from the last electrode of an electrolysis bath to the axis of the rotating cleaning brush (as seen in the direction of belt travel) should be max. 1.5 s, preferably 0.3 s + 0.2 s. Based on a belt speed of 240 m / min, i.e. 4 m / s, this results in distances of max. 6 m, preferably 2 to 0.4 m, between the last electrode and the axis of the rotating cleaning brush.
  • the number and size of the electrolysis cells depends on the degree and type of contamination and on the desired throughput speed or output of the system. Most of the surfaces Soiling is usually removed by brushing in the first cleaning cell after the first electrolytic activation. If there are several successive electrolysis cells, it is advisable to separate the containers and the liquid circuits.
  • the degreasing device contains a rinsing container, preferably a cascade rinsing.
  • a rinsing container preferably a cascade rinsing.
  • the electrolyte still adhering to the surface is washed off with rinsing liquid, preferably with hot water, with the help of rotating brushes.
  • squeezing rollers can greatly reduce the entrainment of liquid (electrolyte) in a known manner.
  • a hot air dryer can also be connected to the washing tank, depending on the further treatment or use of the belt, which has now been optimally cleaned.
  • FIG. 1 An example of the prior art is shown in FIG. 1 'and an example of the method according to the invention is shown in FIG. 2. 3 shows the reduction in surface residues achieved according to the invention.
  • the steel strip 11 to be degreased and cleaned is guided into a cleaning unit 12 according to the prior art and is sprayed between spray bars 14 which are fed with electrolyte solution.
  • the steel strip 11 is then brushed between rotating brushes 15 within the cleaning unit 12.
  • the steel strip 11 then passes into another
  • Cleaning unit 13 namely an electrolysis cell with electrodes 18 arranged parallel to both surfaces of the steel strip 11, which are fed by the rectifier 17. After the electrolytic cleaning between the electrodes 18, the steel strip 11 is brushed again between rotating brushes 16. Following the cleaning unit 13, a further rinsing container, not shown, is provided for rinsing the steel strip 11 with hot water.
  • the steel strip 21 is introduced into a first cleaning unit 22, in which it is also first sprayed with electrolyte solution between spray bars 24 and then immediately subjected to the electrolysis between electrodes 29 without a brushing process.
  • the steel strip 21 is then brushed by means of rotating brushes 25, which are arranged within the cleaning unit 22, and then passes into a second cleaning unit 23, in which electrodes 28 and rotating brushes 26 are again provided.
  • a washing container (not shown) with hot water is also provided in accordance with Example 1. Both the electrodes 29 in the cleaning unit 22 and the electrodes 28 in the cleaning unit 23 are fed by the rectifier 27.
  • the temperature of the electrolytes in the cleaning units 12, 13, 22, and 23 is 80 ° C.
  • the current is supplied to the electrodes 18 via the rectifier 17.
  • the current density was 20 A / dm 2 band surface at a voltage of 17 V.
  • due to the dimensions of the electrodes installed there is a response time of 0.8 s, regardless of whether the electrodes are connected anodically or cathodically.
  • the above data resulted in a power consumption of 8.0 C / dm 2 surface.
  • the steel strip 21 - with the same amount of impurities as the strip 11 - was also passed through the installation according to FIG. 2. If the power of the rectifier 27 is significantly reduced, the electrodes 29, 28 are supplied with current. The current density applied is 2 A / dm 2 strip surface at a voltage of 4 V. In the system and due to the dimensions of the built-in electrodes 29, 28, there is a time of 0.8 seconds in which the electrolysis onto the steel strip 21 acts, so that there is a power consumption of only 0.8 C / dm 2 for this system. The residual amount of impurities remaining on the steel strip 21 is shown in FIG. 3, namely 18% of the original iron content and 1% of the carbon content. In addition to reducing the power consumption from 8.0 to 0.8 C / dm 2 , the remaining amounts of impurities are also significantly reduced.
  • FIG. 4 shows a cleaning and degreasing system similar to that shown in FIG. 2.
  • the steel strip to be degreased or cleaned passes from a decoiler 1 into a welding machine, by means of which two successive strips are welded together to form an endless strip, a so-called loop tower 2 being provided as a buffer.
  • the belt is transferred from the loop tower 2 into a cell 3, where it is heated; this can be done by spraying, dipping or under electrolysis current.
  • the strip subsequently arrives in an electrolysis cell 4, where it is guided and cleaned between electrodes arranged parallel to one another. After brushing in a brushing machine 5, further cleaning takes place in a further electrolysis cell 6 and a brushing machine 7, behind which a washing tank 8 is arranged.
  • Cells 3, 4 and 6 are supplied with power by means of rectifiers 9 and 10.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
EP87101407A 1986-03-01 1987-02-03 Procédé, installation et dispositif de dégraissage et de nettoyage en continu de bandes de métaux, en particulier de bandes d'acier laminées à froid Withdrawn EP0235595A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3606750 1986-03-01
DE19863606750 DE3606750A1 (de) 1986-03-01 1986-03-01 Verfahren, anlage und vorrichtung zum kontinuierlichen entfetten und reinigen der oberflaeche von metallbaendern, insbesondere kaltgewalztem bandstahl

Publications (2)

Publication Number Publication Date
EP0235595A2 true EP0235595A2 (fr) 1987-09-09
EP0235595A3 EP0235595A3 (fr) 1989-03-29

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Family Applications (1)

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EP87101407A Withdrawn EP0235595A3 (fr) 1986-03-01 1987-02-03 Procédé, installation et dispositif de dégraissage et de nettoyage en continu de bandes de métaux, en particulier de bandes d'acier laminées à froid

Country Status (2)

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EP (1) EP0235595A3 (fr)
DE (1) DE3606750A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303035A1 (fr) * 1987-08-10 1989-02-15 HILLE & MÜLLER Feuillard laminé à froid revêtu d'une couche en nickel à forte pénétration de diffusion par voie électrolytique et procédé pour la fabrication de ce feuillard laminé à froid
EP0518850A1 (fr) * 1991-06-10 1992-12-16 Andritz-Patentverwaltungs-Gesellschaft m.b.H. Procédé et dispositif de décapage électrolytique d'objets conducteurs électriques transportés en continu
DE4425854C1 (de) * 1994-07-07 1995-11-09 Mannesmann Ag Elektrolytisches Oberflächenbehandlungsverfahren und Anlage zur Durchführung des Verfahrens
EP0763609A1 (fr) * 1995-09-15 1997-03-19 MANNESMANN Aktiengesellschaft Procédé et dispositif pour le traitement de produits sous forme de bande en acier inoxydable
EP0870854A1 (fr) * 1997-04-10 1998-10-14 Hotani Co., Ltd. Procédé et dispositif pour le nettoyage de bandes
EP1059369A1 (fr) * 1999-06-09 2000-12-13 Kawasaki Steel Corporation Procédé et appareillage pour le dégraissage de bandes en acier
EP1051545B1 (fr) * 1998-02-02 2006-06-21 Outokumpu Stainless AB Procede de traitement d'un produit metallique
CN110592656B (zh) * 2019-09-17 2021-05-18 陈烁 五金件的除铁锈装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3007854A (en) * 1957-06-14 1961-11-07 Nat Steel Corp Method of electrodepositing aluminum on a metal base

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3007854A (en) * 1957-06-14 1961-11-07 Nat Steel Corp Method of electrodepositing aluminum on a metal base

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Band 85, Nr. 4, 26. Juni 1976, Seite 352, Zusammenfassung Nr. 26719w, Columbus, Ohio, US; D. SALM et al.: "High-speed continuous plating of steel strip", & ELECTROPLAT. MET. FINISH. 1976, 29(1), 9-11 *
STAHL UND EISEN, Band 105, Nr. 21, 21. Oktober 1985, Seiten 55-60; A. STEIDL: "Firmenportr{t: RASSELSTEIN AG" *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303035A1 (fr) * 1987-08-10 1989-02-15 HILLE & MÜLLER Feuillard laminé à froid revêtu d'une couche en nickel à forte pénétration de diffusion par voie électrolytique et procédé pour la fabrication de ce feuillard laminé à froid
EP0518850A1 (fr) * 1991-06-10 1992-12-16 Andritz-Patentverwaltungs-Gesellschaft m.b.H. Procédé et dispositif de décapage électrolytique d'objets conducteurs électriques transportés en continu
DE4425854C1 (de) * 1994-07-07 1995-11-09 Mannesmann Ag Elektrolytisches Oberflächenbehandlungsverfahren und Anlage zur Durchführung des Verfahrens
EP0695818A1 (fr) 1994-07-07 1996-02-07 MANNESMANN Aktiengesellschaft Procédé et dispositif pour traitement de surface électrolytique
EP0763609A1 (fr) * 1995-09-15 1997-03-19 MANNESMANN Aktiengesellschaft Procédé et dispositif pour le traitement de produits sous forme de bande en acier inoxydable
US5804056A (en) * 1995-09-15 1998-09-08 Mannesmann Aktiengesellschaft Process and apparatus for producing strip products from stainless steel
EP0870854A1 (fr) * 1997-04-10 1998-10-14 Hotani Co., Ltd. Procédé et dispositif pour le nettoyage de bandes
US6216304B1 (en) 1997-04-10 2001-04-17 Hotani Co., Ltd. Apparatus for cleaning strips
EP1051545B1 (fr) * 1998-02-02 2006-06-21 Outokumpu Stainless AB Procede de traitement d'un produit metallique
EP1059369A1 (fr) * 1999-06-09 2000-12-13 Kawasaki Steel Corporation Procédé et appareillage pour le dégraissage de bandes en acier
US6547886B1 (en) 1999-06-09 2003-04-15 Kawasaki Steel Corporation Method and apparatus for degreasing steel strip
CN110592656B (zh) * 2019-09-17 2021-05-18 陈烁 五金件的除铁锈装置
CN110592656B8 (zh) * 2019-09-17 2021-06-11 义乌市择木工业产品设计有限公司 五金件的除铁锈装置

Also Published As

Publication number Publication date
DE3606750A1 (de) 1987-09-03
EP0235595A3 (fr) 1989-03-29
DE3606750C2 (fr) 1987-11-26

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