EP0419678A1 - Tole d'acier a deux couches, extremement resistante a la corrosion, avec une excellente aptitude au revetement, et ne presentant aucun cloquage lors du revetement electrolytique, ainsi que procede pour sa fabrication - Google Patents

Tole d'acier a deux couches, extremement resistante a la corrosion, avec une excellente aptitude au revetement, et ne presentant aucun cloquage lors du revetement electrolytique, ainsi que procede pour sa fabrication Download PDF

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Publication number
EP0419678A1
EP0419678A1 EP90905670A EP90905670A EP0419678A1 EP 0419678 A1 EP0419678 A1 EP 0419678A1 EP 90905670 A EP90905670 A EP 90905670A EP 90905670 A EP90905670 A EP 90905670A EP 0419678 A1 EP0419678 A1 EP 0419678A1
Authority
EP
European Patent Office
Prior art keywords
coating
alloys
steel sheet
coated
layer
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Withdrawn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
EP90905670A
Other languages
German (de)
English (en)
Other versions
EP0419678A4 (en
Inventor
Hiroshi Miwa
Masaru Sagiyama
Masahiro Shoji
Yasunori Osaki
Masayuki Kurata
Arata Fukada
Takeshi Bessho
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.)
JFE Engineering Corp
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
NKK Corp
Nippon Kokan 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
Priority claimed from JP8927189A external-priority patent/JPH02267251A/ja
Priority claimed from JP19252789A external-priority patent/JPH0361396A/ja
Application filed by Toyota Motor Corp, NKK Corp, Nippon Kokan Ltd filed Critical Toyota Motor Corp
Publication of EP0419678A1 publication Critical patent/EP0419678A1/fr
Publication of EP0419678A4 publication Critical patent/EP0419678A4/en
Withdrawn legal-status Critical Current

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    • 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
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc
    • 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
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
    • 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

Definitions

  • the present invention relates to multi-layer coated steel sheets having high corrosion resistance excellent in paintability particularly coated steel sheets suitable to rust proof steel sheets for automobiles, and relates to a producing method thereof,
  • Automobile bodies are mainly composed of thin steel sheets. For keeping, therefore, body appearances and safety thereof due to maintenance of mechanical strength for a long term of time, it is indispensable to provide excellent corrosion resistance and paintability for the steel sheets themselves to be used.
  • alloy-electroplated steel sheet such as Zn-Fe, Zn-Ni and others have been conventionally developed.
  • paintability on the other hand, since crater shaped paint defects appear when zinc or zinc alloy coated steel sheets are subjected to cationic electrodeposition paint, arts for avoiding such defects are required.
  • two-layer coated steel sheets which have lower layers of zinc or zinc alloy coating and upper layers of Fe-Zn alloy coating having compositions containing not less than 50% Fe thereon, have been developed (Japanese Patent Publication No.58-15554, same No.57-28754, and Plating and Surface Finishing, 72 (1985) No.8, P52). Accordingly, by using said two-layer coated steel sheets, the high corrosion resistance and the excellent paintability may be made compatible.
  • the inventors made studies on the above mentioned paint defects, and consequently cleared up that the cause of the defect occurrence was a hydrogen absorbed in the multi-layer thick-coated steel sheets during producing processes, and found that said paint defects could be avoided by limiting an amount of the hydrogen absorption to be not more than 300 ml/m2.
  • the present invention is based upon such findings, and is charactrized by a multi-layer coated steel sheet having,
  • Such multi-layer coated steel plates have the excellent paintabilities and the high degree corrosion resistance, because of avoiding concurrently occurrences of the craters and the bubble-like paint defects caused by the electrodeposition paint.
  • the coated steel sheet is heated at a temperature of the steel surface between 100 and 400°C for not less than one second.
  • the coated steel plate in an open coil is heated in a non-oxidizing atmosphere to a temperature between 100 and 250°C.
  • Fig.1 is a magnifying microphotograph showing bubble-like defects occurring in a cationic electrodeposited paint film
  • Figs.2 and 3 show, with respect to an as-coated multi-layer steel sheets and the multi-layer steel sheets of multi-layers having removed the absorbed hydrogen by heating after coating, the results of the quantitative analysis of the concentrations of the absorbed hydrogen therein by an ion micro mass analyzer
  • Fig.4 shows the degrees of the relation between the amounts of the hydrogen absorption and the bubble-like ED paint defects
  • Fig.5 shows the relation between the releasing of the absorbed hydrogen and the temperature
  • Fig.6 shows, with respect to the as-coated multi-layer steel plate and the multi-layer steel plate having been heat-treated after coating, the results of the measurement of the hydrogen absorbed therein by a gas chromatography.
  • the multi-layer coated steel sheets of this invention have the inner layer plated coating, and the outer layer plated coating,
  • coated films based on Zn or Zn alloys as an inner layer coating, there are, for example, coated films of single layer or multi-layer structure composed of coatings based on Zn alloys or composite coatings based on Zn or Zn alloys,
  • the inner layer coating may be structured by mixing the coating based on Zn alloys or the composite coating based on Zn or Zn alloys, or the both, with Zn coating respectively. Also in this case, as the coating based on Zn alloys and the composite coating based on Zn or Zn alloys, the coatings of one or more than one kinds being different may be mixed.
  • the coatings based on Zn alloys are Zn-Fe, Zn-Ni, Zn-Mn, Zn-Co alloyed coatings, or said alloyed coatings thereof, each of which is contained with one or more than one kinds of elements as Ti, Cr, Mo, W, etc.
  • one or more than one kinds of Al2O3, Cr2O3, SiO2, BaCrO4, etc. are Co deposited in the Zn coating or the above mentioned coatings based on Zn alloys.
  • the coatings based on Fe alloys are coatings containing, in Fe, one or more than one kinds of, e.g., Zn, Ni, Co, Mn, Cr, Mo, W, P and B.
  • the total amount of the absorbed hydrogen in the coated film and in the steel sheet is limited to be not more than 300ml/m2 per one side of the steel sheet (which is the absorbed amount under the normal conditions of 1 atm and 25°C) in producing the above mentioned multi-layer coated structures.
  • the coated film based on Fe alloys or the Fe coated film is formed as the outer layer by means of the electro-plating, the hydrogen is generated on surface of the inner layer in great volume, and a part thereof is absorbed in the coated layers and the steel.
  • Figs.2 and 3 show the results of the quantitative analysis of the concentration of the absorbed hydrogen therein by an ion micro mass analyzer (IMA). If a comparison is made between the case having removed the absorbed hydrogen by heating and the case not having done, it is found that the hydrogen is considerably absorbed in as-coated steel sheets.
  • IMA ion micro mass analyzer
  • the hydrogen was released by heating in an Ar atmosphere the multi-layer coated steel plates as mentioned above, and the hydrogen amount was measured with a gas chromatograph method, and the amount of the absorbed hydrogen in the coated steel sheets was measured. Then the relation between the amount of the absorbed hydrogen and an occurring degree of bubble-like paint defects was obtained.
  • Fig.4 shows the results.
  • a test sample used herein was the multi-layer coated steel sheet with the inner layer being the hot dipping alloyed zinc coating of the coating amount of 38 g/m2 and the outer layer being the 80% Fe-Zn alloyed electro-plated coating of the coating amount of 5 g/m2.
  • the amount of the absorbed hydrogen in the coated steel sheet was adjusted by a preheating treatment prior to the electro-painting. As seen from Fig .4, it is a necessary condition that the amount of the absorbed hydrogen is to be not more than 300 ml/m2 for preventing the occurrence of the bubble-like defects.
  • For controlling the amount of the absorbed hydrogen there are methods of (1) heating, after coating the outer layer, the coated steel sheet; (2) selecting conditions difficult to cause the hydrogen absorption, as the condition of coating the outer layer; (3) employing steel kinds which are low in the hydrogen absorption, or difficult to release the hydrogen if absorbing it, or methods of combining them.
  • the heating procedure is performed in a continuous line, aiming at a high productivity for not less than one second at said temperature (steel surface temperature). If the heating temperature is less than one second, it is diffuclt to avoid the bubble-like paint defects even at said temperature range.
  • a maximum heating time is not especially limited, as far as the inner layer coating and the steel sheet do not create an alloying reaction. Heating manners are a high frequency induction heating system, and electric heating system and others, not especially limiting.
  • a heating atmosphere is sufficient with the atmosphere containing no hydrogen or hydrogen of a degree actually not causing the hydrogen absorption, such as a nitrogen, or an air atmosphere, not yet especially limiting. If heating for a long period of time in the atmosphere, the outer layer coating is oxidized, and consequently a modifying treatment is hindered. Therefore, a time is limited to the heating in the atmosphere.
  • the heating treatment is carried out in the open coil heating.
  • the steel sheet is heated at the temperature between 100 and 250°C in the non-oxidizing atmosphere.
  • the lower limit thereof is as referred to above.
  • the upper limit of the heating temperature is set at 250°C.
  • the heating atmosphere is determined to be non-oxidizing for the following reasons.
  • the coating based on Fe or Fe alloys of the outer layer is oxidized on the surface during heating and cooling, and subsequently a phosphate film is not normally formed which is required as an undercoated treatment for painting.
  • the hydrogen concentration thereof should be made to an extent that the hydrogen is not absorbed in the coated layer and in the steel sheet while performing the heating.
  • the heating time is sufficient with not less than one second in total at the steel temperature of not less than 100°C. If the heating time is less than one second, it is not possible to prevent the occurrence of the bubble-like ED paint defects even in said temperature range.
  • the upper limit of the heating time in said temperature range is not especially limited, and is enough with about 30 minutes, taking the productivity into consideration.
  • the cold rolled coils of the compositions of Table 1 were successively subjected, as blank coils, to the hot dipping zinc plating in the continuous plating line of the non-oxidizing furnace system, the alloying treatment, the temper rolling, and Fe-Zn electric plating, whereby the multi-layer coated steel sheets were produced.
  • the hydrogen absorption amounts were adjusted by changing the Fe-Zn coating amounts, continuously heat-treating the multi-layer coated steel sheets at the temperature of not less than 100°C in the induction heating system, or heat-treating the open coils.
  • the Fe-Zn electric platings for the outer layers were practised under following conditions:-
  • the cold rolled coils of the compositions of Table 1 were successively subjected, as blank coils, to the hot dipping zinc plating in the continuous plating line of the non-oxidizing furnace system, the alloying treatment, the temper rolling, and Fe-Zn electroplating, and were successively subjected to the heating treatment under the atmospheric conditions via the induction heating system.
  • Table 4 the shows results of the evaluation of the outer appearances of the coated films and the corrosion resistances after the electro-deposition paint and the coating adhesion together with the producing conditions. According to the above table, the multi-layer coated steel sheets heat-treated at the temperature from 100 to 400°C are superior in all properties.
  • the multi-layer coated steel plates were produced from the cold rolled coils shown in the Table 1 which have passed the annealings and temper rollings, by alkaline degreasing, sulfuric acid picklings, Zn-Fe alloying electroplating and Fe-Zn alloying electroplatings, and were successively subjected to the heating treatmetns under the nitrogen atmosphere via the induction heating system.
  • Table 5 shows the results of the evaluation of the outer appearances of the coated films and the corrosion resistances after the electro-deposition paint and the coating adhesion together with the producing conditions. It is seen from the same that the multi-layer coated steel sheets which have been heat-treated at the temperature between 100 and 400°C, are superior in all properties.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Thermal Sciences (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Laminated Bodies (AREA)

Abstract

Une tôle d'acier à deux couches possède un revêtement à base de zinc renfermant au moins un revêtement d'alliage de zinc ou un revêtement composite au zinc et présentant un poids de revêtement de 25g/m2 ou plus, formé sur une tôle d'acier, ainsi qu'un revêtement à base de fer contenant au moins un revêtement en fer ou un revêtement d'alliage de fer d'une teneur en fer de 50 % ou plus et présentant un poid de 1 à 10 g/m2, formé sur le revêtement à base de zinc, l'occlusion totale d'hydrogène du revêtement et de l'acier étant limitée à 300 ml/m2 maximum (par face de tôle). L'excellente aptitude au revêtement de cette tôle empêche sa cratérisation et son cloquage lors du revêtement électrolytique et la rend particulièrement appropriée comme tôle d'acier antirouille pour automobiles. Cette tôle d'acier est produite par application du double revêtement précité et traitement thermique de la tôle revêtue à une température comprise entre 100 et 400 °C.
EP19900905670 1989-04-07 1990-04-06 Highly corrosion-resistant, double-coated steel sheet excellent in coatability and prevented from blistering in elecrodeposition coating and process for producing the same Withdrawn EP0419678A4 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP89271/89 1989-04-07
JP8927189A JPH02267251A (ja) 1989-04-07 1989-04-07 気泡状電着塗膜欠陥発生を防止可能とした塗装適合性に優れた高耐食性複層めっき鋼板
JP19252789A JPH0361396A (ja) 1989-07-27 1989-07-27 気泡状電着塗膜欠陥発生を防止可能とした電着塗装性に優れた複層めっき鋼板の製造方法
JP192527/89 1989-07-27

Publications (2)

Publication Number Publication Date
EP0419678A1 true EP0419678A1 (fr) 1991-04-03
EP0419678A4 EP0419678A4 (en) 1993-12-01

Family

ID=26430700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900905670 Withdrawn EP0419678A4 (en) 1989-04-07 1990-04-06 Highly corrosion-resistant, double-coated steel sheet excellent in coatability and prevented from blistering in elecrodeposition coating and process for producing the same

Country Status (4)

Country Link
EP (1) EP0419678A4 (fr)
KR (1) KR920700310A (fr)
CA (1) CA2030812A1 (fr)
WO (1) WO1990012128A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2327805A1 (fr) * 2009-11-14 2011-06-01 Bayerische Motoren Werke Aktiengesellschaft Procédé et installation de fabrication destinés à fabriquer une pièce usinée en tôle dotée d'un revêtement de protection contre la corrosion
US9895863B2 (en) 2013-08-26 2018-02-20 Jfe Steel Corporation High-strength galvanized steel sheet and method of manufacturing the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2324273B1 (es) 2008-02-01 2010-05-24 Clear Glass Curtains, S.L. Sistema de cerramiento de espacios.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0047987A1 (fr) * 1980-09-12 1982-03-24 Nippon Steel Corporation Matériau enacier revêtu par électrodéposition cationique
EP0293476A1 (fr) * 1986-12-06 1988-12-07 Nisshin Steel Co., Ltd. Tole d'acier a double galvanisation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5573888A (en) * 1978-11-22 1980-06-03 Nippon Kokan Kk <Nkk> High corrosion resistant zinc-electroplated steel sheet with coating and non-coating
JPS5923893A (ja) * 1982-07-29 1984-02-07 Sumitomo Metal Ind Ltd 耐食性に優れたメツキ鋼板及びその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0047987A1 (fr) * 1980-09-12 1982-03-24 Nippon Steel Corporation Matériau enacier revêtu par électrodéposition cationique
EP0293476A1 (fr) * 1986-12-06 1988-12-07 Nisshin Steel Co., Ltd. Tole d'acier a double galvanisation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9012128A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2327805A1 (fr) * 2009-11-14 2011-06-01 Bayerische Motoren Werke Aktiengesellschaft Procédé et installation de fabrication destinés à fabriquer une pièce usinée en tôle dotée d'un revêtement de protection contre la corrosion
US9895863B2 (en) 2013-08-26 2018-02-20 Jfe Steel Corporation High-strength galvanized steel sheet and method of manufacturing the same

Also Published As

Publication number Publication date
CA2030812A1 (fr) 1990-10-08
WO1990012128A1 (fr) 1990-10-18
EP0419678A4 (en) 1993-12-01
KR920700310A (ko) 1992-02-19

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