EP0249206A2 - Procédé pour obtenir des couches de chromates - Google Patents

Procédé pour obtenir des couches de chromates Download PDF

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Publication number
EP0249206A2
EP0249206A2 EP87108362A EP87108362A EP0249206A2 EP 0249206 A2 EP0249206 A2 EP 0249206A2 EP 87108362 A EP87108362 A EP 87108362A EP 87108362 A EP87108362 A EP 87108362A EP 0249206 A2 EP0249206 A2 EP 0249206A2
Authority
EP
European Patent Office
Prior art keywords
drying
contact
hydrazine
brought
steel
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Withdrawn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
EP87108362A
Other languages
German (de)
English (en)
Other versions
EP0249206A3 (fr
Inventor
Kenshi Saeki
Noriaki Yoshitake
Takayuki Aoki
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.)
Nihon Parkerizing Co Ltd
Original Assignee
Nihon Parkerizing Co Ltd
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 Nihon Parkerizing Co Ltd filed Critical Nihon Parkerizing Co Ltd
Publication of EP0249206A2 publication Critical patent/EP0249206A2/fr
Publication of EP0249206A3 publication Critical patent/EP0249206A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment

Definitions

  • the invention relates to a process for the production of chromate coatings on metal surfaces by application of solutions or dispersions containing chromium VI compounds and subsequent drying of the liquid film and its application to the treatment of steel, aluminum and / or zinc or zinc alloy plated steel surfaces.
  • chromate coatings by means of solutions containing chromic acid and / or chromate, which are optionally dried, in particular on surfaces of steel, aluminum and clad steel sheet. This improves, for example, the corrosion resistance, irrespective of whether or not painting is subsequently carried out.
  • Such sheets are commercially available, for example under the name Zincrometal or DuraSteel. They are manufactured using the process of chromating sheet steel, applying a zinc-rich lacquer ( Z incrometal) or chromating sheet steel, applying a resin containing organic and inorganic constituents (DuraSteel).
  • drying processes which are particularly common in strip treatment, are used, the process is usually unwinding of the sheet metal strip from the coil, application of the chromating solution, squeezing off excess solution, drying of the liquid film at an object temperature of around 50 to 100 ° C Winding up to the coil.
  • the chromate coating produced on the metal surfaces generally has a layer weight of 5 to 200 m g / m 2 .
  • drying In the case of drying processes, painting can follow as a further process step, a coating layer of about 0.1 to 3 g / m being formed.
  • drying generally takes place at an object temperature of 50 to 100 ° C. If the temperature exceeds 80 ° C, cooling is usually carried out in a subsequent stage.
  • the chromate-coated sheet as described above, is often further processed by being deformed, cleaned and painted. Problems arise here in that components are removed from the chromate coating of the workpiece in the cleaning stage, so that the coating quality is impaired. In addition, the extracted substance, which consists mainly of hexavalent chromium, gets into the cleaning solution, which creates wastewater and environmental problems.
  • the object of the invention is to provide a process for the production of chromate coatings which, in principle, uses conventional technology, leads to high-quality coatings, but is not associated with the disadvantages of considerable layer detachment or energy or apparatus expenditure.
  • the object is achieved by designing the method of the type mentioned at the outset in accordance with the invention in such a way that the coating obtained by drying is brought into contact with a solution containing reducing agents.
  • Another advantage of the invention is that the required contact time between the chromate coating and the reducing agent-containing solution can be kept very short if, according to a preferred embodiment of the invention, the coating obtained by drying is brought into contact with a solution containing a strong reducing agent. This preference works in particular in strip treatment plants where generally only a short contact time is available.
  • the coating obtained by drying is brought into contact with a solution which contains reducing agents containing nitrogen atoms, such as hydrazine, hydroxylamine, hydrazine phosphate, etc.
  • chromating solutions or dispersions suitable for drying processes can be used in the process according to the invention. These can be chromating solutions containing only chromium VI ions, but also those which additionally contain chromium III ions and / or phosphate ions and / or resin. If the chromating liquid contains resin, curing can take place with ultraviolet or electron beams.
  • the V erfaren is particularly suitable for the treatment of steel, aluminum and / or plated steel surfaces.
  • zinc or zinc alloys such as Zn-A1, Zn-Ni, Zn-Fe, Z n-Mn alloys are particularly important.
  • the layer detachment in% (calculated as Cr) was determined in step 5 in the treatment with hydrazine solution and in step 8 in the treatment with the cleaning solution.
  • the layer detachment in stage 5 is shown graphically in FIG. 1, that in stage 8 in FIG. 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
EP87108362A 1986-06-13 1987-06-10 Procédé pour obtenir des couches de chromates Withdrawn EP0249206A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP61136030A JPS62294184A (ja) 1986-06-13 1986-06-13 クロメ−ト皮膜の溶出抑制方法
JP136030/86 1986-06-13

Publications (2)

Publication Number Publication Date
EP0249206A2 true EP0249206A2 (fr) 1987-12-16
EP0249206A3 EP0249206A3 (fr) 1989-03-15

Family

ID=15165539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87108362A Withdrawn EP0249206A3 (fr) 1986-06-13 1987-06-10 Procédé pour obtenir des couches de chromates

Country Status (6)

Country Link
US (1) US4956027A (fr)
EP (1) EP0249206A3 (fr)
JP (1) JPS62294184A (fr)
AU (1) AU595331B2 (fr)
CA (1) CA1295214C (fr)
DE (1) DE3719312A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991005078A1 (fr) * 1989-09-27 1991-04-18 Henkel Corporation Composition et procede de chromatage d'acier galvanise et de materiau analogue
WO2009007208A1 (fr) * 2007-07-12 2009-01-15 International Business Machines Corporation Procédés de réduction du chrome hexavalent dans les revêtements de conversion à base de chromate trivalent
KR101221841B1 (ko) * 2012-08-16 2013-01-22 (주)현대산기 판재 절단장치

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0730457B2 (ja) * 1988-02-18 1995-04-05 新日本製鐵株式会社 クロメート処理メッキ鋼板とその製造方法
DE4135524C2 (de) * 1991-10-28 1995-01-26 Gc Galvano Consult Gmbh Verfahren und Mittel zum Chromatieren von Oberflächen aus Zink oder Cadmium oder Legierungen davon
US6190464B1 (en) * 1998-09-24 2001-02-20 Nisshin Steel Co., Ltd. Chromating solution and chromated metal sheet
EP1984536B1 (fr) * 2006-02-14 2012-03-28 Henkel AG & Co. KGaA Composition et procedes d'un revetement resistant a la corrosion a base de chrome trivalent par voie seche destine a une utilisation sur des surfaces metalliques
WO2007134152A1 (fr) * 2006-05-10 2007-11-22 Henkel Ag & Co. Kgaa. Composition améliorée comprenant du chrome trivalent s'utilisant pour former des couches anti-corrosion sur des surfaces métalliques
DE102007060185A1 (de) * 2007-12-14 2009-06-18 Siemens Ag Verfahren zum Beschichten einer metallischen Oberfläche sowie Beschichtungssystem
US10156016B2 (en) 2013-03-15 2018-12-18 Henkel Ag & Co. Kgaa Trivalent chromium-containing composition for aluminum and aluminum alloys

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2768104A (en) * 1952-03-25 1956-10-23 Heintz Mfg Co Method for coating iron
US2777785A (en) * 1953-07-30 1957-01-15 Heintz Mfg Co Composition for and method of treating metals as well as the treated product
US2976193A (en) * 1959-08-03 1961-03-21 Purex Corp Ltd Process and compositions for producing aluminum surface conversion coatings
US3493441A (en) * 1967-08-25 1970-02-03 Hooker Chemical Corp Detoxification of hexavalent chromium containing coating on a metal surface
US3535168A (en) * 1967-10-13 1970-10-20 Hooker Chemical Corp Metal treating process
US3620777A (en) * 1968-07-24 1971-11-16 Hooker Chemical Corp Chromate chemical coating solution for zinc alloy
US3762949A (en) * 1971-08-31 1973-10-02 Inland Steel Co Method for removing chromate stain from galvanized metal
US3935035A (en) * 1973-06-05 1976-01-27 Nippon Steel Corporation Aqueous solution and method for surface treatment of metals
US3932198A (en) * 1974-05-24 1976-01-13 Amchem Products, Inc. Coating solution having trivalent chromium and manganese for coating metal surfaces
GB1532230A (en) * 1975-11-24 1978-11-15 Imasa Ltd Treatment of chromated metal surfaces with sulphur-compounds

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991005078A1 (fr) * 1989-09-27 1991-04-18 Henkel Corporation Composition et procede de chromatage d'acier galvanise et de materiau analogue
US5091023A (en) * 1989-09-27 1992-02-25 Henkel Corporation Composition and process for chromating galvanized steel and like materials
WO2009007208A1 (fr) * 2007-07-12 2009-01-15 International Business Machines Corporation Procédés de réduction du chrome hexavalent dans les revêtements de conversion à base de chromate trivalent
KR101221841B1 (ko) * 2012-08-16 2013-01-22 (주)현대산기 판재 절단장치

Also Published As

Publication number Publication date
EP0249206A3 (fr) 1989-03-15
DE3719312A1 (de) 1987-12-17
CA1295214C (fr) 1992-02-04
AU595331B2 (en) 1990-03-29
AU7416887A (en) 1987-12-17
US4956027A (en) 1990-09-11
JPS62294184A (ja) 1987-12-21
JPS6341985B2 (fr) 1988-08-19

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