KR920701528A - 프레스 성형성, 화성처리성 등에 뛰어난 아연계 도금강판 및 그 강판의 제조방법 - Google Patents

프레스 성형성, 화성처리성 등에 뛰어난 아연계 도금강판 및 그 강판의 제조방법

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KR920701528A
KR920701528A KR1019910700888A KR910700888A KR920701528A KR 920701528 A KR920701528 A KR 920701528A KR 1019910700888 A KR1019910700888 A KR 1019910700888A KR 910700888 A KR910700888 A KR 910700888A KR 920701528 A KR920701528 A KR 920701528A
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zinc
steel sheet
oxide
plated steel
inorganic
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KR1019910700888A
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KR940001032B1 (ko
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다쓰야 가나마루
쥰이찌 모리따
가쓰또시 아라이
신이찌 스즈끼
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야마모또 젠사꾸
신닛뽕세이데쓰 가부시끼가이샤
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Priority claimed from JP1320450A external-priority patent/JPH0635678B2/ja
Priority claimed from JP1328783A external-priority patent/JPH03191093A/ja
Priority claimed from JP1328781A external-priority patent/JPH03191091A/ja
Priority claimed from JP1328784A external-priority patent/JPH03191094A/ja
Priority claimed from JP1328782A external-priority patent/JPH03191092A/ja
Priority claimed from JP2048208A external-priority patent/JPH0696780B2/ja
Priority claimed from JP2048209A external-priority patent/JPH0713307B2/ja
Priority claimed from JP2048207A external-priority patent/JPH0696779B2/ja
Priority claimed from JP2088693A external-priority patent/JPH0696782B2/ja
Priority claimed from JP2088695A external-priority patent/JPH0696784B2/ja
Priority claimed from JP2088696A external-priority patent/JPH0696785B2/ja
Priority claimed from JP20285090A external-priority patent/JPH0711070B2/ja
Priority claimed from JP2204067A external-priority patent/JP2819427B2/ja
Priority claimed from JP2204068A external-priority patent/JP2819428B2/ja
Priority claimed from JP21540690A external-priority patent/JP2767650B2/ja
Priority claimed from JP2305581A external-priority patent/JP2826902B2/ja
Priority claimed from JP2305582A external-priority patent/JP2691797B2/ja
Application filed by 야마모또 젠사꾸, 신닛뽕세이데쓰 가부시끼가이샤 filed Critical 야마모또 젠사꾸
Publication of KR920701528A publication Critical patent/KR920701528A/ko
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Publication of KR940001032B1 publication Critical patent/KR940001032B1/ko

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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
    • C23C22/05—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 using aqueous solutions
    • C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/40—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
    • C23C22/42—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates containing also phosphates
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
    • 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
    • C23C22/05—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 using aqueous solutions
    • C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • 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
    • C23C22/05—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 using aqueous solutions
    • C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/53—Treatment of zinc or alloys based thereon
    • 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
    • C23C22/73—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 characterised by the process
    • 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
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/34—Anodisation of metals or alloys not provided for in groups C25D11/04 - C25D11/32
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/02—Electrophoretic coating characterised by the process with inorganic material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/04—Electrophoretic coating characterised by the process with organic material

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  • Chemical & Material Sciences (AREA)
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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Coating With Molten Metal (AREA)

Abstract

내용 없음

Description

프레스 성형성, 화성처리성 등에 뛰어난 아연계 도금강판 및 그 강판의 제조방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 전기아연도금 강판표면에 형성한 비정질 산화물에 피막의 결정구조를 나타낸 전자현미경사진, 제2도는 전기아연도금 강판표면에 비정질 산화물계피막을 형성한 표면의 전자프로우브 마이크로 아나라이저 선분석도, 제3도는 제1도의 강판을 드로우비이드 접동시험에 건 후의 표면의 결정구조를 나타낸 전자 현미경사진.

Claims (17)

  1. 아연계 도금강판의 아연계 도금표면에 무기 산화물 적어도 1종을 1~500㎎/㎡(무기원소의 중량으로서)함유하는 피막을 형성시킨 프레스 성형성, 화성 처리성이 뛰어난 아연계 도금강판.
  2. 제1항에 있어서, 무기 산화물이 Mn, Mo, Co, Ni, Ca 및 P의 산화물로서된 군에서 선택된 1종의 산화물인 아연계 도금강판.
  3. 제2항에 있어서, 무기 산화물이 Mm산화물인 아연계 도금강판.
  4. 제3항에 있어서, 인산 및/또는 붕산, 소망에 따라 Mo산화물, W산화물 및 V산화물에서 선택된 적어도 1종의 산화물을 1000㎎/㎡(2종 이상의 경우는 그 합계량)이하로 추가로 함유한 아연계 도금강판.
  5. 제2항에 있어서, 무기산화물이 P산화물인 아연계 도금강판.
  6. 제5항에 있어서, 붕산 1~500㎎/㎡(B로서)및/또는 기타의 무기 산화물을 추가로 함유한 아연계 도금강판.
  7. 아연계 도금강판의 아연계 도금표면에 무기 산화물 및/또는 그 수산화물의 적어도 1종을 1~500㎎/㎡(무기원소환산 중량으로서)와 산소산 및/또는 무기 산화물 콜로이드의 적어도 1종을 1~500㎎/㎡(무기원소환산중량으로서)로서 이루어진 무기계 피복층을 형성시킨 웅착방지와 구름윤활기능을 합쳐 갖는 프레스 형성성, 화성 처리성이 뛰어난 아연계 도금강판.
  8. 제7항에 있어서, 응착방지기능을 도금층과의 계면에 강하게, 구름윤활기능을 피복층 표면에 강하게, 경사 피복시킨 아연계 도금강판.
  9. 제7항에 있어서, 무기 산화물 및/또는 그 수산화물이 Mn, Mo, Co, Ni, Ca, Cr, V, W, Ti, Al및 Zn로서 된 금속원소의 산화물 또는 수산화물인 아연계 도금강판.
  10. 제1항에 있어서, 상기 아연도금표면과 상기 피막과의 사이에 상기 표면에 직접 제공된 Zn산화물로서 된 피막을 추가로 갖는 아연계 도금강판.
  11. 제10항에 있어서, 상기 피막을 형성하는 무기산화물이 Mn의 산화물이며, 상기 Zn산화물의 양이 3~500㎎/㎡(Zn 환산)인 아연계 도금강판.
  12. 제10항에 있어서, 상기 피막이 붕상 및/또는 인산화물을 더 함유하고 있는 것이 아연계 도금강판.
  13. 제10항에 있어서, 상기 Zn산화물로서 피막이 Zn산화물로서 30~3000㎎/㎡를 함유한 것이 아연계 도금강판.
  14. 제13항에 있어서, 상기 Zn산화물로서 된 피막의 위에 Mn, Mo, Co, Ni, Ca, W, V, 및 B의 산화물군에서 선택된 적어도 1종의 산화물을 1000㎎/㎡이하 함유한 피막을 추가로 형성시킨 아연계 도금강판.
  15. 제13항에 있어서, Zn산화물로서 된 상기 피막상에 P산화물과 Zn산화물을 각각 1~500㎎/㎡를 함유한 피막을 추가로 형성시킨 아연계 도금강판.
  16. 도금층 표면에, 프레스 성형적 도금층 표면에 밀착하고, 그 변형에 뒤따라서 피복을 유지하는 응착방지기능과, 금형과 도금층간의 구름윤활기능을 합쳐 갖는 무기계 피복층 2~2000㎎/㎡(금속으로서)를 형성시킬때에, 아연계 도금강판을 Mn, Mo, Co, Ni, Ca, Cr, V, W, Ti, Al및 Zn의 1종 또는 2종 이상의 금속이온을 함유하고, 또한 P, B 의 1종 또는 2종의 산소산를 함유한 pH5 이하의 자성 수용액에 접촉 또는 그 액중에서 음극전해처리함으로서 이루어지는 프레스 성형성, 화성 처리성이 뛰어난 아연계 도금강판의 제조방법.
  17. 아연계 도금강판의 표면에 아연 산화물을, (a)아연계 도금강판을 산성 산화제 수용액에 접촉시킨다, (b)아연계 도금강판을 아연이온과 산화제 함유 수용액 중에서 음극전해처리한다, (c)300~600℃의 아연계 도금 강판표면에 기수 혼합체를 불어 붙인다.
    상기 (a),(b),(c)의 어느 하나의 방법에 의해 생성하고 이어서 그 상층에 Mn, Mo, Co, Ni, Ca, Cr, V, W, Ti 및 Al을 함유한 금속이온 및 P,B를 함유한 산소산의 적어도 1종을 함유한 pH5 이하의 산성 수용액에 접촉 또는 그 수용액 중에서 음극전해처리함으로서 이루어지는 프레스 성형성, 화상 처리성이 뛰어난 아연계 도금강판의 제조방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019910700888A 1989-12-12 1990-12-11 프레스 성형성, 화성처리성 등에 뛰어난 아연계 도금강판 및 그 강판의 제조방법 KR940001032B1 (ko)

Applications Claiming Priority (37)

Application Number Priority Date Filing Date Title
JP01-320450 1989-12-12
JP1320450A JPH0635678B2 (ja) 1989-12-12 1989-12-12 プレス性，化成処理性に優れた亜鉛系めっき鋼板
JP1328783A JPH03191093A (ja) 1989-12-19 1989-12-19 プレス性、化成処理性に優れた亜鉛系めっき鋼板
JP1328782A JPH03191092A (ja) 1989-12-19 1989-12-19 プレス性、化成処理性に優れた亜鉛系めっき鋼板
JP1328784A JPH03191094A (ja) 1989-12-19 1989-12-19 プレス性、化成処理性に優れた亜鉛系めっき鋼板
JP01-328781 1989-12-19
JP01-328783 1989-12-19
JP01-328784 1989-12-19
JP01-328782 1989-12-19
JP1328781A JPH03191091A (ja) 1989-12-19 1989-12-19 プレス性、化成処理性に優れた亜鉛系めっき鋼板
JP02-048209 1990-02-28
JP02-048208 1990-02-28
JP02-048207 1990-02-28
JP2048209A JPH0713307B2 (ja) 1990-02-28 1990-02-28 プレス成形性、化成処理性に優れた亜鉛系めっき鋼板
JP2048208A JPH0696780B2 (ja) 1990-02-28 1990-02-28 プレス成形性、化成処理性に優れた亜鉛系めっき鋼板
JP2048207A JPH0696779B2 (ja) 1990-02-28 1990-02-28 プレス成形性、化成処理性に優れた亜鉛系めっき鋼板
JP2088693A JPH0696782B2 (ja) 1990-04-03 1990-04-03 プレス成形性、化成処理性、溶接性に優れた亜鉛系めっき鋼板
JP02-088696 1990-04-03
JP02-088695 1990-04-03
JP2088695A JPH0696784B2 (ja) 1990-04-03 1990-04-03 プレス成形性、化成処理性、溶接性に優れた亜鉛系めっき鋼板
JP02-088693 1990-04-03
JP2088696A JPH0696785B2 (ja) 1990-04-03 1990-04-03 プレス成形性、化成処理性、溶接性に優れた亜鉛系めっき鋼板
JP02-202850 1990-07-31
JP20285090A JPH0711070B2 (ja) 1990-07-31 1990-07-31 溶接性、プレス性、化成処理性に優れた亜鉛系めっき鋼板
JP2204067A JP2819427B2 (ja) 1990-08-01 1990-08-01 プレス成形性、化成処理性に優れた亜鉛系めっき鋼板
JP02-204068 1990-08-01
JP02-204067 1990-08-01
JP2204068A JP2819428B2 (ja) 1990-08-01 1990-08-01 プレス成形性、化成処理性に優れた亜鉛系めっき鋼板
JP02-215406 1990-08-14
JP21540690A JP2767650B2 (ja) 1990-08-14 1990-08-14 溶接性、プレス性、化成処理性に優れた亜鉛系めっき鋼板
JP02-305581 1990-11-10
JP2305581A JP2826902B2 (ja) 1990-11-10 1990-11-10 プレス成形性、化成処理性に優れた亜鉛系めっき鋼板の製造方法
JP02-305583 1990-11-10
JP2305582A JP2691797B2 (ja) 1990-11-10 1990-11-10 プレス成形性、化成処理性に優れた亜鉛系めっき鋼板
JP02-305582 1990-11-10
JP30558390 1990-11-10
PCT/JP1990/001615 WO1991009152A1 (en) 1989-12-12 1990-12-11 Galvanized steel plate having excellent capability of press working, chemical conversion and the like, and production of said plate

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KR940001032B1 KR940001032B1 (ko) 1994-02-08

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CA2175105C (en) * 1995-05-23 1999-09-21 C. Ramadeva Shastry Process for improving the formability and weldability properties of zinc coated steel sheet
WO2002033141A1 (fr) * 2000-10-19 2002-04-25 Nkk Corporation Tole d"acier plaque de zinc et procede de preparation de cette tole, et procede de fabrication d"un article forme par usinage a la presse
KR100605354B1 (ko) * 2000-12-04 2006-07-28 제이에프이 스틸 가부시키가이샤 아연계 도금강판 및 그 제조방법
EP1439240B2 (en) † 2001-10-23 2018-10-03 Nippon Steel & Sumitomo Metal Corporation Method for hot-press forming a plated steel product
WO2004094683A1 (ja) * 2003-04-18 2004-11-04 Jfe Steel Corporation プレス成形性に優れた溶融亜鉛めっき鋼板とその製造方法
JP4970632B2 (ja) * 2010-07-09 2012-07-11 新日本製鐵株式会社 溶融亜鉛系めっき鋼板
KR101500049B1 (ko) * 2012-12-27 2015-03-06 주식회사 포스코 아연 또는 아연계합금도금 강판용 인산염 용액 및 이를 이용한 아연 또는 아연계합금도금 강판

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US2417133A (en) * 1940-11-23 1947-03-11 Du Pont Electrodepositing and heat-treating molybdenum-oxygen deposits
JPS57500248A (ko) * 1980-02-06 1982-02-12
FR2569203B1 (fr) * 1984-08-16 1989-12-22 Produits Ind Cie Fse Procede de traitement par conversion chimique de substrats en zinc ou en l'un de ses alliages, concentre et bain utilises pour la mise en oeuvre de ce procede
JPS61133399A (ja) * 1984-12-03 1986-06-20 Nippon Steel Corp 鋼板の燐酸塩処理方法
US4861441A (en) * 1986-08-18 1989-08-29 Nippon Steel Corporation Method of making a black surface treated steel sheet
JPS63186883A (ja) * 1987-01-28 1988-08-02 Nippon Steel Corp スポツト溶接性に優れた亜鉛系めつき鋼板

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WO1991009152A1 (en) 1991-06-27
CA2046288C (en) 2001-02-06
EP0456834A1 (en) 1991-11-21
DE69027428T2 (de) 1997-02-13
AU6888991A (en) 1991-07-18
EP0456834A4 (en) 1992-07-08
EP0456834B1 (en) 1996-06-12
DE69027428D1 (de) 1996-07-18
AU629724B2 (en) 1992-10-08
CA2046288A1 (en) 1991-06-13

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