EP0866147B1 - Herstellungsverfahren eines Gegenstandes aus Stahlblech, der direkt-Emailliert wird - Google Patents

Herstellungsverfahren eines Gegenstandes aus Stahlblech, der direkt-Emailliert wird Download PDF

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Publication number
EP0866147B1
EP0866147B1 EP98400466A EP98400466A EP0866147B1 EP 0866147 B1 EP0866147 B1 EP 0866147B1 EP 98400466 A EP98400466 A EP 98400466A EP 98400466 A EP98400466 A EP 98400466A EP 0866147 B1 EP0866147 B1 EP 0866147B1
Authority
EP
European Patent Office
Prior art keywords
surface treatment
pickling
pickled
sheet
process according
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 - Lifetime
Application number
EP98400466A
Other languages
English (en)
French (fr)
Other versions
EP0866147A1 (de
Inventor
Vincent Cholet
Daniel Vonner
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0866147A1 publication Critical patent/EP0866147A1/de
Application granted granted Critical
Publication of EP0866147B1 publication Critical patent/EP0866147B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D3/00—Chemical treatment of the metal surfaces prior to coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating
    • Y10T29/49986—Subsequent to metal working

Definitions

  • the invention relates to a method for preparing a sheet metal object. enamelled.
  • the mass enamel layer serves as a bonding layer to the sheet.
  • the cover layer is the top layer.
  • the metal surface to be glazed is prepared in order to obtain, in particular, good adhesion of the enamel layer to the sheet.
  • a lubricating agent for example a layer of oil and after this operation it then degrease the sheet (just before pickling).
  • the sheet used for shaping is generally already processed for temporary corrosion protection (under the conditions of transport and storage); this protective surface treatment, applied to the outcome of the production of sheet metal strips, can also have a function lubricating.
  • Stripping and surface treatment are generally carried out by immersion or by sprinkling.
  • This pickling is necessary to create micro-roughness on the surface facilitating the adhesion of the enamel.
  • This deep pickling is a drawback insofar as it generates very large volumes of sludge to be treated.
  • the invention aims to overcome this handicap by shifting the operation of pickling before shaping, at the producer of sheet metal strips himself, which has efficient and economical facilities for sludge treatment suitable for mass production and also dedicated to the treatment of effluents from other operations, such as rolling of steel strips.
  • the invention also aims to apply, in a single treatment, a layer, easily degreasable, temporary protection against corrosion and pre-lubrication.
  • the invention while stripping is carried out directly on the sheet metal strip, the surface, pickled and then treated in one operation at a time for temporary corrosion protection and for pre-lubrication, however retains sufficient reactivity, after shaping and degreasing, to make the nickel-plating treatment effective.
  • This new order of manufacturing operations makes it possible to supply sheets already pickled, suitable for direct enameling after possible shaping and a simple degreasing and nickel plating treatment; the enameller no longer has needs stripping facilities and is freed from sludge treatment pickling.
  • the strip of sheet metal is stripped and then, in one single operation, a first surface treatment called "temporary protection” against corrosion ”and“ pre-lubrication ”.
  • composition of the pickling bath and the pickling conditions are known in themselves; for example sulfuric acid baths are used and we pickle under suitable conditions to remove about 25 g / m2 on each side of sheet metal strip.
  • the surface density of said layer is less than or equal to 0.5 g / m2 / side.
  • pickling and this first surface treatment are performed online after work hardening, at high speed, for example at speed of 30 m / min. or beyond; pickling time can be significantly reduced compared to the stripping times of art preparation processes anterior: for example 2 to 25 seconds compared to commonly more than five minutes in the prior art.
  • the pickling sludge is treated economically here in effluent treatment facilities provided elsewhere to treat effluents from rolling and work hardening.
  • the pickled and treated sheet (first treatment) in a single operation can then be considered as an intermediate commercial product, primed to direct enameling.
  • This sheet is in fact generally wound and sent to the enamellers.
  • this sheet metal resists corrosion during transport and storage periods, which generally exceed one day, and can reach one to three months.
  • the enamellers then proceed to the following operations in order next: shaping followed by degreasing, second surface treatment called “nickel plating” and direct enamelling itself.
  • It is shaped with or without additional lubrication of the pre-lubrication, usually by stamping, and the part is degreased formed, for example in an alkaline solution.
  • the coefficient of friction of the sheet metal against the forming tools is weaker than with a sheet which would not have been treated according to the criteria mentioned above, which facilitates the shaping operation.
  • This treatment is of a conventional type of nickel plating with a solution containing nickel cations, known in itself for preparing a metallic surface with direct enameling.
  • the solution contains, for example, sulphate or phosphite anions.
  • the nickel-plating conditions are adapted in a way known in itself to obtain a deposit of 0.5 to 2.5 g / m2 on the surface of the object to be glazed.
  • the nickel-plating effluents are those usually found in upstream of the prior art direct enameling installations and do not pose no special treatment problems.
  • the object is therefore coated with a single layer of covered enamel which it is cooked in a manner known in itself.
  • stripping can then be performed continuously on the sheet metal strip directly downstream of the rolling, on large capacity industrial facilities that benefit from facilities widely dimensioned for effluent and sludge treatment.
  • the surface treatment products used during the first treatment are generally easily removed during degreasing, just after shaping, which is necessary to provide good surface reactivity in the following process steps; degreasing effluents are in general easy to deal with.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Detergent Compositions (AREA)

Claims (7)

  1. Verfahren zur Vorbereitung eines im Direktmodus emaillierten Stahlblechs, dadurch gekennzeichnet ist, dass es die nachfolgenden Behandlungsschritte in der angegebenen Reihenfolge aufweist:
    einen Schritt des Beizens, dem unmittelbar ein einziger Schritt der Behandlung der Oberfläche folgt zum zeitweiligen Schutz gegen Korrosion und zur Vorschmierung,
    einen Schritt der Formgebung gefolgt von einer Entfettung,
    einen Schritt der Behandlung der Oberfläche in Form einer Vernickelung,
    einen Schritt der direkten Emaillierung
    und dadurch gekennzeichnet, dass die Behandlung der Oberfläche zum zeitweiligen Schutz gegen Korrosion und zur Vorschmierung derart gewählt wird, dass sie die drei folgenden Kriterien erfüllt, wenn die Behandlung durchgeführt wird nach dem Beizen eines unbeschichteten Stahlblechs mit einer Dicke von 1 mm der Sorte DC 03 ED oder DC 04 ED entsprechend der Norm EN 10209:
    1/ Kriterium der Korrosionsfestigkeit: dieses erfordert, dass nach 10 Zyklen eines feuchtwarmen Versuches nach der Norm DIN 50017 die gebeizte und anschliessend behandelte Oberfläche keine Spur an Rotrost aufweist;
    2/ Kriterium der Schmierung: dieses erfordert, dass nach dem formgebenden Tiefziehvorgang eines Zuschnitts aus gebeiztem und behandeltem Stahlblech mit einem Durchmesser von 90 mm zu einem Topf mit flachem Boden, wobei der Tiefziehvorgang ohne weitere Zufuhr eines Schmiermittels mittels eines Stempels mit einem Durchmesser von 50 mm über eine Höhe von 25 mm und mit einer Geschwindigkeit von 1,6 mm/sec durchgeführt wird, kein Riss im Zuschnitt feststellbar ist, wenn die Klemmkraft für die Ränder des Zuschnitts kleiner oder gleich 65 kN ist;
    3/ Kriterium der Entfettung: dieses erfordert, dass unter den folgenden Bedingungen keine erheblichen Behandlungsspuren nach der Entfettung der gebeizten und danach behandelten Oberfläche feststellbar sind: zuerst eintauchen während 3 Minuten in ein Bad mit einer Temperatur von ungefähr 60° C, das 35 g/l an Natriummetasilikat, 16 g/l an Trinatriumphosphat und 2 g/l an Nitriloessigsäure enthält, danach spülen mit Leitungswasser bei der Umgebungstemperatur durch eintauchen während 1 Minute mit anschliessendem besprühen mit dem gleichen Wasser während 0,5 Minuten.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Behandlung der Oberfläche zum zeitweiligen Schutz gegen Korrosion und zur Vorschmierung erfolgt durch Aufbringung einer gleichförmigen Ölschicht.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Behandlung der Oberfläche zum zeitweiligen Schutz gegen Korrosion und zur Vorschmierung erfolgt durch Aufbringung einer gleichförmigen Schicht einer wässrigen Ölemulsion.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Oberflächendichte nach der Trocknung kleiner oder gleich 0,5 g/m2/Seite ist.
  5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Behandlung der Oberfläche zum Schutz gegen Korrosion und zur Vorschmierung erfolgt durch Aufbringung einer wässrigen Lösung, die ein gelöstes Ethoxylat eines Fettalkohols und einen Korrosionshemmer enthält.
  6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Bedingungen für die Vernickelung derart festgelegt werden, dass eine Abscheidung zwischen 0,5 und 2,5 g/m2/Seite auf der zu emaillierenden Oberfläche erhalten wird.
  7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Zeitraum, der den Schritt des Beizens und der Behandlung der Oberfläche von der Formgebung trennt grösser als ein Tag ist.
EP98400466A 1997-03-21 1998-02-27 Herstellungsverfahren eines Gegenstandes aus Stahlblech, der direkt-Emailliert wird Expired - Lifetime EP0866147B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9703452A FR2761082B1 (fr) 1997-03-21 1997-03-21 Procede de preparation d'un objet en tole d'acier emaille en mode direct
FR9703452 1997-03-21

Publications (2)

Publication Number Publication Date
EP0866147A1 EP0866147A1 (de) 1998-09-23
EP0866147B1 true EP0866147B1 (de) 2002-04-10

Family

ID=9505039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98400466A Expired - Lifetime EP0866147B1 (de) 1997-03-21 1998-02-27 Herstellungsverfahren eines Gegenstandes aus Stahlblech, der direkt-Emailliert wird

Country Status (9)

Country Link
US (1) US6199263B1 (de)
EP (1) EP0866147B1 (de)
AT (1) ATE216000T1 (de)
CA (1) CA2234433A1 (de)
DE (1) DE69804705T2 (de)
DK (1) DK0866147T3 (de)
ES (1) ES2173555T3 (de)
FR (1) FR2761082B1 (de)
PT (1) PT866147E (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2805277B1 (fr) * 2000-02-18 2002-04-19 Usinor Procede de fabrication d'une piece metallique emaillee sans operation de degraissage

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2569453A (en) 1949-09-14 1951-10-02 Poor & Co Vitreous enamel base stock, vitreous enameled articles and method
US2809907A (en) 1953-04-17 1957-10-15 Parker Rust Proof Co Vitreous enameling
US2983634A (en) 1958-05-13 1961-05-09 Gen Am Transport Chemical nickel plating of magnesium and its alloys
GB886361A (en) 1958-10-20 1962-01-03 Pfizer & Co C Metal treatment
DE1802182C3 (de) 1968-10-10 1979-05-31 Bayer Ag, 5090 Leverkusen Verfahren zur Vorbehandlung von Stahlblechen für Emaillierungen
US3927460A (en) * 1972-08-07 1975-12-23 Kawasaki Steel Co Pretreating process for vitreous enamelling
FR2739396B1 (fr) * 1995-09-28 1997-10-24 Lorraine Laminage Procede de preparation de la surface metallique d'un objet, notamment en tole d'acier, pour emaillage en mode direct

Also Published As

Publication number Publication date
EP0866147A1 (de) 1998-09-23
DE69804705D1 (de) 2002-05-16
ES2173555T3 (es) 2002-10-16
CA2234433A1 (fr) 1998-09-21
FR2761082A1 (fr) 1998-09-25
PT866147E (pt) 2002-08-30
FR2761082B1 (fr) 1999-04-30
ATE216000T1 (de) 2002-04-15
US6199263B1 (en) 2001-03-13
DE69804705T2 (de) 2002-10-17
DK0866147T3 (da) 2002-07-29

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