EP1186679A1 - Hot-dip galvanising alloy and process - Google Patents
Hot-dip galvanising alloy and process Download PDFInfo
- Publication number
- EP1186679A1 EP1186679A1 EP00203141A EP00203141A EP1186679A1 EP 1186679 A1 EP1186679 A1 EP 1186679A1 EP 00203141 A EP00203141 A EP 00203141A EP 00203141 A EP00203141 A EP 00203141A EP 1186679 A1 EP1186679 A1 EP 1186679A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy
- zinc
- hot
- galvanising
- weight
- 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- Withdrawn
Links
- 238000005246 galvanizing Methods 0.000 title claims abstract description 9
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 5
- 239000000956 alloy Substances 0.000 title claims abstract description 5
- 238000000034 method Methods 0.000 title claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 6
- 239000011701 zinc Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910001297 Zn alloy Inorganic materials 0.000 claims abstract 3
- 238000007654 immersion Methods 0.000 claims abstract 2
- 238000000576 coating method Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
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
- 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
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
Definitions
- the present invention relates to a bath for hot-dip galvanising consisting of alloyed zinc, that is particularly useful for batchwise galvanising steel articles.
- the aim of the present invention is therefore to provide a bath composition for hot-dip galvanising, which results in a coating thickness of 30 to 50 ⁇ m. Also, the thickness of the intermetallic layer is reduced to approximately 30 to 35 ⁇ m. This induces an increased resistance to stress induced crack formation as required e.g. for critical parts in the automotive industry.
- the bath contains, by weight, 0.1 to less than 1 % Bi, 0.01 to 0.05 % Al, 0.04 to 0.12 % Ni, up to 0.05 % Mn, the rest being zinc and unavoidable impurities.
- the bath contains 0.3 to 0.8 % Bi, 0.02 to 0.04 % Al, 0.06 to 0.10 % Ni and up to 0.05 % Mn.
- a bath composition with 0.5 % Bi, 0.03 % Al and 0.08 % Ni is especially preferred.
- the galvanising process using the alloy of the invention is particularly suitable for coating low reactivity steel.
- low reactivity steel is meant steel comprising, by weight, Si and P in such amounts that Si ⁇ 0.03 % and % Si + 2.5 x % P ⁇ 0.09.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Abstract
Alloy and process for galvanising steel by immersion in a zinc alloy
containing bath comprising by weight 0.1 to less than 1% Bi, 0.01 to
0.05% Al, 0.04 to 0.12% Ni up to 0.05% Mn, the rest being zinc and
unavoidable impurities.
Description
- The present invention relates to a bath for hot-dip galvanising consisting of alloyed zinc, that is particularly useful for batchwise galvanising steel articles.
- Conventional galvanisation practice results in a coating thickness of 70 to 120 µm. A drawback of such thick coatings is the reduced resistance to stress induced crack formation.
- The aim of the present invention is therefore to provide a bath composition for hot-dip galvanising, which results in a coating thickness of 30 to 50 µm. Also, the thickness of the intermetallic layer is reduced to approximately 30 to 35 µm. This induces an increased resistance to stress induced crack formation as required e.g. for critical parts in the automotive industry.
- According to the invention the bath contains, by weight, 0.1 to less than 1 % Bi, 0.01 to 0.05 % Al, 0.04 to 0.12 % Ni, up to 0.05 % Mn, the rest being zinc and unavoidable impurities. Preferably, the bath contains 0.3 to 0.8 % Bi, 0.02 to 0.04 % Al, 0.06 to 0.10 % Ni and up to 0.05 % Mn. A bath composition with 0.5 % Bi, 0.03 % Al and 0.08 % Ni is especially preferred.
- The galvanising process using the alloy of the invention is particularly suitable for coating low reactivity steel. By low reactivity steel is meant steel comprising, by weight, Si and P in such amounts that Si < 0.03 % and % Si + 2.5 x % P < 0.09.
Claims (4)
- An alloy for hot-dip galvanising steel comprising, by weight, 0.1 to less than 1 % Bi, 0.01 to 0.05 % Al, 0.04 to 0.12 % Ni, up to 0.05 % Mn, the rest being zinc and unavoidable impurities.
- An alloy according to claim 1, comprising, by weight, 0.3 to 0.8 % Bi, 0.02 to 0.04 % Al, 0.06 to 0.10 % Ni, up to 0.05 % Mn, the rest being zinc and unavoidable impurities.
- A process for galvanising steel by immersion in a zinc alloy galvanising bath comprising the step of immersing the steel articles in a molten bath of a zinc alloy comprising, by weight, 0.1 to less than 1 % Bi, 0.01 to 0.05 % Al, 0.04 to 0.12 % Ni, up to 0.05 % Mn, the rest being zinc and unavoidable impurities.
- A process according to claim 3, characterised in that the steel articles comprise, by weight, Si and P in such amounts that Si < 0.03 % and % Si + 2.5 x % P < 0.09.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP00203141A EP1186679A1 (en) | 2000-09-12 | 2000-09-12 | Hot-dip galvanising alloy and process |
| PCT/EP2001/010155 WO2002022907A1 (en) | 2000-09-12 | 2001-09-04 | Hot-dip galvanising alloy and process |
| EP01976184A EP1325168A1 (en) | 2000-09-12 | 2001-09-04 | Hot-dip galvanising alloy and process |
| BR0113801-4A BR0113801A (en) | 2000-09-12 | 2001-09-04 | Alloy for hot dip galvanizing steel, and process for dip galvanizing steel in a zinc alloy galvanizing bath |
| AU2001295536A AU2001295536A1 (en) | 2000-09-12 | 2001-09-04 | Hot-dip galvanising alloy and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP00203141A EP1186679A1 (en) | 2000-09-12 | 2000-09-12 | Hot-dip galvanising alloy and process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1186679A1 true EP1186679A1 (en) | 2002-03-13 |
Family
ID=8172008
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00203141A Withdrawn EP1186679A1 (en) | 2000-09-12 | 2000-09-12 | Hot-dip galvanising alloy and process |
| EP01976184A Withdrawn EP1325168A1 (en) | 2000-09-12 | 2001-09-04 | Hot-dip galvanising alloy and process |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01976184A Withdrawn EP1325168A1 (en) | 2000-09-12 | 2001-09-04 | Hot-dip galvanising alloy and process |
Country Status (4)
| Country | Link |
|---|---|
| EP (2) | EP1186679A1 (en) |
| AU (1) | AU2001295536A1 (en) |
| BR (1) | BR0113801A (en) |
| WO (1) | WO2002022907A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004079032A1 (en) * | 2003-03-07 | 2004-09-16 | N.V. Bekaert S.A. | Zinc-nickel coating layer |
| CN107699836A (en) * | 2017-10-16 | 2018-02-16 | 宜兴大平杆塔制造有限公司 | A kind of galvanized method of power transmission line column |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09202952A (en) * | 1996-01-25 | 1997-08-05 | Kawasaki Steel Corp | Highly workable galvannealed steel sheet and method for producing the same |
| WO1998053109A1 (en) * | 1997-05-23 | 1998-11-26 | N.V. Union Miniere S.A. | Alloy and process for galvanizing steel |
-
2000
- 2000-09-12 EP EP00203141A patent/EP1186679A1/en not_active Withdrawn
-
2001
- 2001-09-04 BR BR0113801-4A patent/BR0113801A/en not_active Application Discontinuation
- 2001-09-04 EP EP01976184A patent/EP1325168A1/en not_active Withdrawn
- 2001-09-04 WO PCT/EP2001/010155 patent/WO2002022907A1/en not_active Ceased
- 2001-09-04 AU AU2001295536A patent/AU2001295536A1/en not_active Abandoned
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09202952A (en) * | 1996-01-25 | 1997-08-05 | Kawasaki Steel Corp | Highly workable galvannealed steel sheet and method for producing the same |
| WO1998053109A1 (en) * | 1997-05-23 | 1998-11-26 | N.V. Union Miniere S.A. | Alloy and process for galvanizing steel |
Non-Patent Citations (1)
| Title |
|---|
| DATABASE WPI Section Ch Week 199741, Derwent World Patents Index; Class M13, AN 1997-444209, XP002159784 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004079032A1 (en) * | 2003-03-07 | 2004-09-16 | N.V. Bekaert S.A. | Zinc-nickel coating layer |
| CN107699836A (en) * | 2017-10-16 | 2018-02-16 | 宜兴大平杆塔制造有限公司 | A kind of galvanized method of power transmission line column |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2001295536A1 (en) | 2002-03-26 |
| BR0113801A (en) | 2003-07-08 |
| EP1325168A1 (en) | 2003-07-09 |
| WO2002022907A1 (en) | 2002-03-21 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 18D | Application deemed to be withdrawn |
Effective date: 20020914 |