EP0663454B2 - Verfahren zur Unterdrückung der Zinkdampfbildung beim Schmelztauchbeschichten eines Stahlbandes - Google Patents
Verfahren zur Unterdrückung der Zinkdampfbildung beim Schmelztauchbeschichten eines Stahlbandes Download PDFInfo
- Publication number
- EP0663454B2 EP0663454B2 EP94112801A EP94112801A EP0663454B2 EP 0663454 B2 EP0663454 B2 EP 0663454B2 EP 94112801 A EP94112801 A EP 94112801A EP 94112801 A EP94112801 A EP 94112801A EP 0663454 B2 EP0663454 B2 EP 0663454B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- zinc
- steel strip
- suppressing
- dip coating
- gas atmosphere
- 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.)
- Expired - Lifetime
Links
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 15
- 239000010959 steel Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 11
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims description 24
- 239000011701 zinc Substances 0.000 title claims description 23
- 238000003618 dip coating Methods 0.000 title claims description 5
- 238000009834 vaporization Methods 0.000 title claims 2
- 239000007789 gas Substances 0.000 claims abstract description 24
- 230000001681 protective effect Effects 0.000 claims abstract description 13
- 239000011261 inert gas Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 3
- 229910001297 Zn alloy Inorganic materials 0.000 claims abstract 2
- 239000011248 coating agent Substances 0.000 claims abstract 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 23
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 12
- 239000001569 carbon dioxide Substances 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims 1
- 238000001704 evaporation Methods 0.000 abstract description 3
- 230000008020 evaporation Effects 0.000 abstract description 3
- 238000007654 immersion Methods 0.000 abstract 1
- 239000000155 melt Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000010494 dissociation reaction Methods 0.000 description 4
- 230000005593 dissociations Effects 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 2
- 241001474791 Proboscis Species 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000003197 gene knockdown Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000011144 upstream manufacturing 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
-
- 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
- C23C2/003—Apparatus
- C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
- C23C2/004—Snouts
Definitions
- the invention relates to a method for suppression the formation of zinc vapor during hot dip coating a steel belt.
- EP 0 172 681 then contains the teaching in more detail limited amount of water vapor in the protective gas atmosphere in the trunk above the zinc bath surface.
- the inert or nitrogen gas introduced 250 to 4500 ppm water vapor and 1 to 8 Vol .-% hydrogen injected.
- Zinc oxide formed, which covers the zinc bath surface and a further zinc evaporation as a barrier layer prevented. In practice, this is known
- methods according to EP 0 172 681 have disadvantages.
- the increased water vapor content in the trunk leads surface defects in a large number of steels on the line.
- the decay of water molecules creates atomic hydrogen in the steel strip surface diffused. When cooling the dip coated Steel strip arise in the area of inclusion lines, in which the atomic hydrogen accumulates, bulges on the steel surface. This affect the flatness and appearance of the coated Steel surface and are intolerable.
- the invention is based on the object without the disadvantages described in EP 0 172 681 known method from zinc evaporation to suppress the zinc dip bath, in particular should by the measure to be taken, the one to be coated Steel strip in its quality will not be affected.
- the invention relates to a method according to independent claim 1; preferred embodiments are the subject of the dependent claims 2 and 3.
- the invention suggested that the protective gas atmosphere in the trunk above the zinc bath surface Carbon dioxide and a reducing gas, such as Contains hydrogen and / or carbon monoxide.
- a reducing gas such as Contains hydrogen and / or carbon monoxide.
- the proportion of carbon dioxide in the Atmosphere of the probosc is at least 0.05 to about 8 % By volume, preferably 0.5 to 4% by volume.
- the amount of hydrogen can up to 20 vol .-% that of carbon monoxide up to 10 vol .-%.
- the ratio of reducing ones Gas to carbon dioxide in the protective gas atmosphere of the trunk is at least 1: 1 i.e. So, an excess of reducing should be preferred Gas be present.
- a gas mixture consisting of nitrogen or an inert gas mixture and of carbon dioxide and a reducing gas is introduced into the trunk above the zinc bath surface.
- the individual gases of the mixture are fed into the proboscis through a feed pipe via conventional mass flow controllers.
- Zinc reacts with the carbon dioxide on the bath surface according to the chemical formula Zn + CO2 ⁇ ZnO + CO.
- the protective gas atmosphere in the trunk area is a reducing one Gas such as hydrogen or Carbon monoxide, contained in excess as a regulatory. This prevents the dissociation of carbon dioxide produced with the Steel strip surface reacts with the formation of oxide.
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)
Description
Claims (3)
- Verfahren zur Unterdrückung der Zinkverdampfung beim Schmelztauchbeschichten eines Stahlbandes mit Zink oder Zinklegierungen,
dadurch gekennzeichnet, daß im Einlaufbereich der Zinkbeschichtungsanlage eine Schutzgasatmosphäre aus einem Gemisch eines Inertgases, mit Wasserstoff und/oder Kohlenmonoxid als reduzierenden Gasen und zusätzlich Kohlendioxid aufrechterhalten wird, wobei das Verhältnis von reduzierendem Gas zu Kohlendioxid in der Schutzgasatmosphäre mindestens 1:1 beträgt. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß der Schutzgasatmosphäre 0,05 bis 8 Vol.-%, bevorzugt 0,5 bis 4 Vol.-% CO2, zugemischt werden. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß der Schutzgasatmosphäre bis 20 % H2 und bis 10 % CO zugesetzt werden.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4400886 | 1994-01-14 | ||
| DE4400886A DE4400886C2 (de) | 1993-07-24 | 1994-01-14 | Verfahren zur Unterdrückung der Zinkdampfbildung beim Schmelztauchbeschichten eines Stahlbandes |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0663454A1 EP0663454A1 (de) | 1995-07-19 |
| EP0663454B1 EP0663454B1 (de) | 1998-04-15 |
| EP0663454B2 true EP0663454B2 (de) | 2002-01-02 |
Family
ID=6507895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94112801A Expired - Lifetime EP0663454B2 (de) | 1994-01-14 | 1994-08-17 | Verfahren zur Unterdrückung der Zinkdampfbildung beim Schmelztauchbeschichten eines Stahlbandes |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0663454B2 (de) |
| AT (1) | ATE165121T1 (de) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1319282A (en) * | 1970-06-10 | 1973-06-06 | Kuei Fan Yu | Hot dip galvanizing |
| US4466999A (en) * | 1983-10-28 | 1984-08-21 | United States Steel Corporation | Atmospheric gas practice for hot-dip coating of metals |
| JPS6230864A (ja) * | 1985-07-31 | 1987-02-09 | Sumitomo Metal Ind Ltd | 溶融金属めつき装置 |
| US5472740A (en) * | 1990-10-11 | 1995-12-05 | Totoku Electric Co., Ltd. | Process of producing a hot dipped wire from a base wire, with the absence of iron-based, iron oxide-based and iron hydroxide-based minute particles on surfaces of the base wire |
-
1994
- 1994-08-17 EP EP94112801A patent/EP0663454B2/de not_active Expired - Lifetime
- 1994-08-17 AT AT94112801T patent/ATE165121T1/de not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0663454A1 (de) | 1995-07-19 |
| ATE165121T1 (de) | 1998-05-15 |
| EP0663454B1 (de) | 1998-04-15 |
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