BE1007964A6 - Process for coating a galvanised steel strip - Google Patents
Process for coating a galvanised steel strip Download PDFInfo
- Publication number
- BE1007964A6 BE1007964A6 BE9400086A BE9400086A BE1007964A6 BE 1007964 A6 BE1007964 A6 BE 1007964A6 BE 9400086 A BE9400086 A BE 9400086A BE 9400086 A BE9400086 A BE 9400086A BE 1007964 A6 BE1007964 A6 BE 1007964A6
- Authority
- BE
- Belgium
- Prior art keywords
- coating
- strip
- deposited
- zinc
- additional
- Prior art date
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 39
- 239000011248 coating agent Substances 0.000 title claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 6
- 239000010959 steel Substances 0.000 title claims abstract description 6
- 238000000034 method Methods 0.000 title claims description 17
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 22
- 239000011701 zinc Substances 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- 238000005244 galvannealing Methods 0.000 claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000006698 induction Effects 0.000 claims abstract description 3
- 238000007738 vacuum evaporation Methods 0.000 claims description 7
- 238000005246 galvanizing Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 5
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 4
- 238000007598 dipping method Methods 0.000 claims description 4
- 239000008397 galvanized steel Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims 1
- 238000003618 dip coating Methods 0.000 claims 1
- 230000008021 deposition Effects 0.000 abstract description 3
- 229940116024 aftera Drugs 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000000151 deposition Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical group [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/56—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks
- C23C14/562—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks for coating elongated substrates
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/02—Pretreatment of the material to be coated
- C23C14/024—Deposition of sublayers, e.g. to promote adhesion of the coating
- C23C14/025—Metallic sublayers
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
-
- 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
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
A coating of tempered zinc is deposited on a steel strip and subsequently,over at least one surface of the already coated strip, an additional metalcoating is deposited by vapour deposition. This additional metal coating maybe deposited directly onto the tempered zinc coating, after it hassolidified, but before it has finally cooled. It may also be deposited aftera galvannealing treatment of the zinc coating. The additional metal coatingis preferably constituted by aluminium with a thickness of less than 5microns. The vapour deposition, induction heated, device, may be placed in ahorizontal section of an existing galvanisation line.
Description
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Procédé de revêtement d'une bande d'acier galvanisée.
La présente invention concerne un procédé de revêtement d'une bande d'acier galvanisée.
On connaît depuis longtemps l'effet bénéfique du zinc pour la protection des bandes d'acier contre la corrosion, notamment la corrosion atmosphérique. Il existe de nombreux procédés pour déposer en continu un revêtement de zinc sur une bande défilant à travers un bain de zinc fondu ; les revêtements obtenus de la sorte assurent en général une protection satisfaisante.
La durée de la protection offerte par un revêtement de zinc dépend largement de l'épaisseur de ce revêtement. Il est possible d'accroître la durée de protection, c'est-à-dire en fait la résistance à la corrosion de la bande revêtue, en augmentant l'épaisseur du revêtement. Outre diverses difficultés techniques, cette solution entraîne une sérieuse augmentation du prix de la bande revêtue.
On connaît également la technique dite de"galvannealing", qui consiste en une diffusion à chaud du fer de la bande dans la couche de zinc, en vue d'améliorer la résistance à la corrosion. La composition de la couche d'alliage fer-zinc ainsi obtenue conditionne diverses autres propriétés de la bande revêtue, en particulier son aptitude à l'emboutissage, au soudage et à la peinture. A cet égard, la gamme optimale de composition moyenne du revêtement est comprise entre 7 % et 13 % de fer dans le zinc. Il se produit en effet un poudrage excessif à l'emboutissage si la teneur en fer dépasse 13 %, tandis que l'aptitude au soudage du produit n'est pas satisfaisante si la teneur en fer n'atteint pas 7 %.
De plus, cette technique ne s'avère intéressante que pour des revêtements de zinc de faible épaisseur, c'est-à-dire inférieure à 10 Mm environ. Au-delà de cette valeur le problème du poudrage devient prohibitif.
Enfin, il a également déjà été proposé de déposer un revêtement métallique complémentaire sur une bande d'acier revêtue d'une couche de zinc, en
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particulier un revêtement d'aluminium, pour augmenter la résistance à la corrosion du produit revêtu.
La présente invention se situe dans le cadre de la technique du dépôt d'un revêtement complémentaire sur une bande galvanisée, le terme galvanisée englobant aussi les bandes ayant subi un traitement de galvannealing. Le procédé de l'invention permet de déposer un revêtement complémentaire ayant une épaisseur contrôlée, le dépôt étant effectué en continu dans la ligne même de galvanisation et le procédé ne nécessitant pas de transformation importante de l'installation de galvanisation.
Conformément à la présente invention, un procédé de revêtement d'une bande d'acier galvanisée, dans lequel on dépose un revêtement de zinc au trempé sur ladite bande, est caractérisé en ce que l'on dépose ultérieurement, sur au moins une face de la bande déjà revêtue, un revêtement métallique complémentaire par évaporation sous vide.
Selon une première mise en oeuvre, on dépose ledit revêtement complémentaire directement sur la couche de zinc, après solidification mais avant son refroidissement complet.
Dans cette première mise en oeuvre, la bande revêtue de zinc est essorée par des couteaux d'air à sa sortie du bain, selon la pratique usuelle, puis elle est partiellement refroidie, généralement jusqu'à une température comprise entre 3000C et 450 C, pour solidifier le revêtement et éviter le collage sur les rouleaux de renvoi.
Selon une autre mise en oeuvre intéressante, on applique à ladite bande galvanisée un traitement de galvannealing, par maintien de ladite bande à une température comprise entre 460 C et 600*C pendant une durée de 10 à 30 secondes, on refroidit partiellement la bande et on dépose ensuite ledit revêtement métallique complémentaire. Dans ce cas, il s'est avéré intéressant de réaliser le revêtement de zinc, d'une épaisseur ne dépassant pas 10 m, par trempage dans un bain de zinc à une température comprise entre 4400C et 500 C.
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Dans le cas de cette deuxième mise en oeuvre, les conditions de l'opération de galvannealing conduisent à l'obtention d'une teneur en fer comprise entre 7 % et 13 % dans le revêtement de zinc.
Ici aussi, selon la pratique habituelle, cette opération est réalisée après l'essorage du revêtement de zinc par des couteaux d'air, puis la bande est partiellement refroidie pour solidifier le revêtement et éviter le collage sur les rouleaux de renvoi.
Suivant une mise en oeuvre avantageuse de l'invention, le revêtement métallique complémentaire déposé sur la bande par évaporation sous vide est constitué d'aluminium, et son épaisseur est inférieure à 5 pm, et de préférence à 2 Mm.
Dans une installation classique de galvanisation au trempé, la bande revêtue de zinc sort verticalement du bain de zinc et elle monte à travers un dispositif d'essorage par des couteaux d'air jusqu'à un premier rouleau de renvoi supérieur. Celui-ci la dévie à l'horizontale jusqu'à un second rouleau de renvoi supérieur, qui la dévie à nouveau à la verticale vers le bas. Le dispositif de refroidissement, respectivement le four de galvannealing et le dispositif de refroidissement, sont installés sur le brin ascendant de la bande, entre les couteaux d'air et le premier rouleau de renvoi supérieur.
Pour la mise en oeuvre du procédé de l'invention, il est proposé d'installer un dispositif d'évaporation sous vide dans le tronçon horizontal de la bande entre les rouleaux de renvoi supérieurs. Ce dispositif d'évaporation peut être simple ou double, avec déviation appropriée de la bande, selon que l'on désire revêtir de cette manière une seule ou les deux faces de la bande.
L'évaporation du métal à déposer, par exemple l'aluminium, est de préférence réalisée par un chauffage par induction.
Un tel dispositif d'évaporation sous vide peut être aisément intégré dans une installation de galvanisation existante, avec ou sans four de galvannealing. Il se place avantageusement dans une partie de la ligne générale-
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ment inoccupée. Il ne requiert qu'un faible coût d'investissement, car il n'impose pratiquement aucune modification de la ligne. Son coût de fonctionnement est faible, car il n'exige pas de chauffage supplémentaire ni de préparation de surface particulière de la bande.
Le procédé de l'invention, ainsi que le dispositif pour sa mise en oeuvre, permettent de fabriquer un produit revêtu qui présente une résistance nettement accrue à la corrosion, ainsi qu'une très bonne adhérence du revêtement et une aptitude élevée à la mise en forme à la presse. De plus, les faibles coûts d'investissement et de fonctionnement indiqués plus haut rendent ce produit particulièrement économique.
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Coating process for a galvanized steel strip.
The present invention relates to a method of coating a strip of galvanized steel.
The beneficial effect of zinc has long been known for the protection of steel strips against corrosion, in particular atmospheric corrosion. There are many methods for continuously depositing a zinc coating on a strip running through a bath of molten zinc; coatings obtained in this way generally provide satisfactory protection.
The duration of protection offered by a zinc coating depends largely on the thickness of this coating. It is possible to increase the duration of protection, that is to say in fact the corrosion resistance of the coated strip, by increasing the thickness of the coating. In addition to various technical difficulties, this solution leads to a serious increase in the price of the coated tape.
The so-called "galvannealing" technique is also known, which consists of hot diffusion of the iron from the strip into the zinc layer, in order to improve the corrosion resistance. The composition of the iron-zinc alloy layer thus obtained conditions various other properties of the coated strip, in particular its aptitude for stamping, welding and painting. In this regard, the optimal range of average coating composition is between 7% and 13% iron in zinc. Excessive dusting occurs when stamping if the iron content exceeds 13%, while the solderability of the product is not satisfactory if the iron content does not reach 7%.
In addition, this technique is only advantageous for thin zinc coatings, that is to say less than about 10 mm. Beyond this value the powdering problem becomes prohibitive.
Finally, it has also already been proposed to deposit an additional metallic coating on a steel strip coated with a layer of zinc, in
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especially an aluminum coating, to increase the corrosion resistance of the coated product.
The present invention is in the context of the technique of depositing an additional coating on a galvanized strip, the term galvanized also encompassing strips which have undergone a galvannealing treatment. The method of the invention makes it possible to deposit an additional coating having a controlled thickness, the deposition being carried out continuously in the same galvanizing line and the method not requiring significant transformation of the galvanizing installation.
According to the present invention, a method of coating a strip of galvanized steel, in which a zinc coating is deposited by dipping on said strip, is characterized in that it is subsequently deposited, on at least one face of the strip already coated, a complementary metal coating by vacuum evaporation.
According to a first implementation, said additional coating is deposited directly on the zinc layer, after solidification but before its complete cooling.
In this first implementation, the strip coated with zinc is wrung out by air knives as it leaves the bath, according to usual practice, then it is partially cooled, generally to a temperature of between 3000 ° C. and 450 ° C., to solidify the coating and avoid sticking to the deflection rollers.
According to another advantageous implementation, a galvannealing treatment is applied to said galvanized strip, by maintaining said strip at a temperature between 460 ° C. and 600 ° C. for a period of 10 to 30 seconds, the strip is partially cooled and said additional metallic coating is then deposited. In this case, it has proven to be advantageous to produce the zinc coating, of a thickness not exceeding 10 m, by dipping in a zinc bath at a temperature between 4400C and 500 C.
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In the case of this second implementation, the conditions of the galvannealing operation lead to obtaining an iron content of between 7% and 13% in the zinc coating.
Here too, according to usual practice, this operation is carried out after the zinc coating has been wrung by air knives, then the strip is partially cooled to solidify the coating and avoid sticking on the deflection rollers.
According to an advantageous implementation of the invention, the additional metal coating deposited on the strip by vacuum evaporation consists of aluminum, and its thickness is less than 5 μm, and preferably 2 mm.
In a conventional dip galvanizing installation, the zinc-coated strip emerges vertically from the zinc bath and rises through a wringing device with air knives to a first upper deflection roller. The latter deflects it horizontally to a second upper deflection roller, which deflects it again vertically downwards. The cooling device, respectively the galvannealing oven and the cooling device, are installed on the upward strand of the strip, between the air knives and the first upper deflection roller.
For the implementation of the method of the invention, it is proposed to install a vacuum evaporation device in the horizontal section of the strip between the upper deflection rollers. This evaporation device can be single or double, with appropriate deviation of the strip, depending on whether one wishes to coat in this way only one or both sides of the strip.
Evaporation of the metal to be deposited, for example aluminum, is preferably carried out by induction heating.
Such a vacuum evaporation device can be easily integrated into an existing galvanizing installation, with or without a galvannealing oven. It is advantageously placed in a part of the general line-
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unoccupied. It only requires a low investment cost, since it requires practically no modification of the line. Its operating cost is low, because it does not require additional heating or special surface preparation of the strip.
The process of the invention, as well as the device for its implementation, makes it possible to manufacture a coated product which has a markedly increased resistance to corrosion, as well as a very good adhesion of the coating and a high aptitude for application. press training. In addition, the low investment and operating costs indicated above make this product particularly economical.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE9400086A BE1007964A6 (en) | 1994-01-25 | 1994-01-25 | Process for coating a galvanised steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE9400086A BE1007964A6 (en) | 1994-01-25 | 1994-01-25 | Process for coating a galvanised steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE1007964A6 true BE1007964A6 (en) | 1995-11-28 |
Family
ID=3887914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE9400086A BE1007964A6 (en) | 1994-01-25 | 1994-01-25 | Process for coating a galvanised steel strip |
Country Status (1)
| Country | Link |
|---|---|
| BE (1) | BE1007964A6 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0881309A2 (en) * | 1997-04-18 | 1998-12-02 | CENTRO SVILUPPO MATERIALI S.p.A. | Process for continuous physical vapour deposition |
| FR2843130A1 (en) * | 2002-08-05 | 2004-02-06 | Usinor | Coating of a metal material with a crystallographic structure to confer a three-dimensional surface effect, by the application of two coating of a metal or metal alloy |
| AT411692B (en) * | 2002-08-02 | 2004-04-26 | Heinz Ing Altendorfer | Device for cooling a steel strip used in hot dip coating installations comprises groups each containing two blowing boxes that can be moved horizontally |
-
1994
- 1994-01-25 BE BE9400086A patent/BE1007964A6/en not_active IP Right Cessation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0881309A2 (en) * | 1997-04-18 | 1998-12-02 | CENTRO SVILUPPO MATERIALI S.p.A. | Process for continuous physical vapour deposition |
| EP0881309A3 (en) * | 1997-04-18 | 2000-12-20 | CENTRO SVILUPPO MATERIALI S.p.A. | Process for continuous physical vapour deposition |
| AT411692B (en) * | 2002-08-02 | 2004-04-26 | Heinz Ing Altendorfer | Device for cooling a steel strip used in hot dip coating installations comprises groups each containing two blowing boxes that can be moved horizontally |
| FR2843130A1 (en) * | 2002-08-05 | 2004-02-06 | Usinor | Coating of a metal material with a crystallographic structure to confer a three-dimensional surface effect, by the application of two coating of a metal or metal alloy |
| WO2004015169A2 (en) * | 2002-08-05 | 2004-02-19 | Usinor | Method for coating the surface of metallic material, device for carrying out said method |
| WO2004015169A3 (en) * | 2002-08-05 | 2004-05-13 | Usinor | Method for coating the surface of metallic material, device for carrying out said method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| RE20 | Patent expired |
Owner name: CENTRE DE RECHERCHES METALLURGIQUES - CENTRUM VOO Effective date: 20000125 |