EP1325168A1 - Hot-dip galvanising alloy and process - Google Patents
Hot-dip galvanising alloy and processInfo
- Publication number
- EP1325168A1 EP1325168A1 EP01976184A EP01976184A EP1325168A1 EP 1325168 A1 EP1325168 A1 EP 1325168A1 EP 01976184 A EP01976184 A EP 01976184A EP 01976184 A EP01976184 A EP 01976184A EP 1325168 A1 EP1325168 A1 EP 1325168A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bath
- galvanising
- alloy
- hot
- zinc
- 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- Withdrawn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 12
- 229910045601 alloy Inorganic materials 0.000 title claims description 8
- 239000000956 alloy Substances 0.000 title claims description 8
- 238000000034 method Methods 0.000 title claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 12
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 11
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 7
- 239000011701 zinc Substances 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910001297 Zn alloy Inorganic materials 0.000 claims 2
- 238000007654 immersion Methods 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 8
- 239000011248 coating agent Substances 0.000 abstract description 7
- 230000009257 reactivity Effects 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
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 batch- wise galvanising steel articles.
- the aim of the present invention is therefore to provide a bath composition for hot-dip galvanising, which allows for the formation of a coating thickness of only 30 to 50 ⁇ m. Also, the thickness of the intermetallic layer is reduced to approximately 25 to 35 ⁇ m. This results in an increased resistance to stress induced cracks, 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.
- the coating thickness can be reduced by at least 10 %, and even by more than 60 % according to the type of steel used.
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
This invention relates to a bath for hot-dip galvanising consisting of alloyed zinc, that is particularly useful for batch-wise galvanising low reactivity steel articles. The aim of the invention is to provide a bath which results in a coating thickness of 30 to 50 νm. Such a relatively thin coating provides increased resistance to stress induced crack formation. The bath contains, by weight, 0.1 to less than 1 % Bi, 0.01 to 0.05 % A1, 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 % A1, 0.06 to 0.10 % Ni and up to 0.05 % Mn. A bath composition with 0.5 % Bi, 0.03 % A1 and 0.08 % Ni is especially preferred.
Description
Hot-dip galvanising alloy and process
The present invention relates to a bath for hot-dip galvanising consisting of alloyed zinc, that is particularly useful for batch- wise galvanising steel articles.
Conventional galvanisation practice results in a coating thickness of 70 to 120 urn. 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 allows for the formation of a coating thickness of only 30 to 50 μm. Also, the thickness of the intermetallic layer is reduced to approximately 25 to 35 μm. This results in an increased resistance to stress induced cracks, 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.
An illustration of the criticality of the nickel content in the bath is given in the following example: steel samples measuring 100 x 50 x 2.5 mm were immersed in a galvanising bath during 5 minutes, after being prepared in a traditional way by degreasing, pickling, fluxing and rinsing. The following bath compositions were used: - an alloy according to the invention containing 0.53 % Bi, 0.046 % Ni, 0.028 % Al, 0.021 % Mn, and
- a comparative alloy containing 0.51 % Bi, 0% Ni, 0.026 % Al, 0.003 % Mn.
After hot-dip coating, the coating thickness was determined with a
MiniTest 3100 (ElektroPhysik) .
The test was performed on different types of steel alloys:
- HE 320 DR low reactivity steel containing 0.011 % Si and 0.008 % P;
- HE 360 D low reactivity steel containing 0.005 % Si and 0.009 % P; and
- CS steel containing 0.22 % Si and 0.07 % P.
The results are summarised in the following table .
The results show that, by using the alloys according to the invention, the coating thickness can be reduced by at least 10 %, and even by more than 60 % according to the type of steel used.
Claims
1. 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
2. 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
3. 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
4. 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 (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01976184A EP1325168A1 (en) | 2000-09-12 | 2001-09-04 | Hot-dip galvanising alloy and process |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP00203141 | 2000-09-12 | ||
| 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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1325168A1 true EP1325168A1 (en) | 2003-07-09 |
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 Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00203141A Withdrawn EP1186679A1 (en) | 2000-09-12 | 2000-09-12 | 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) |
Families Citing this family (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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3498466B2 (en) * | 1996-01-25 | 2004-02-16 | Ｊｆｅスチール株式会社 | High workability alloyed hot-dip coated steel sheet and method for producing the same |
| ATE222610T1 (en) * | 1997-05-23 | 2002-09-15 | Umicore S A Nv | ALLOY AND METHOD 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
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0222907A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2001295536A1 (en) | 2002-03-26 |
| BR0113801A (en) | 2003-07-08 |
| WO2002022907A1 (en) | 2002-03-21 |
| EP1186679A1 (en) | 2002-03-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20030414 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: UMICORE ZINC ALLOYS BELGIUM |
|
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20100401 |