LU81756A1 - PROCESS FOR THE SURFACE TREATMENT OF STEEL SHEET - Google Patents
PROCESS FOR THE SURFACE TREATMENT OF STEEL SHEET Download PDFInfo
- Publication number
- LU81756A1 LU81756A1 LU81756A LU81756A LU81756A1 LU 81756 A1 LU81756 A1 LU 81756A1 LU 81756 A LU81756 A LU 81756A LU 81756 A LU81756 A LU 81756A LU 81756 A1 LU81756 A1 LU 81756A1
- Authority
- LU
- Luxembourg
- Prior art keywords
- fluxing
- treatment
- sheet
- pickling solution
- bath
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 19
- 238000004381 surface treatment Methods 0.000 title claims description 4
- 238000005554 pickling Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- 238000009835 boiling Methods 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 claims 1
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 3
- 238000005246 galvanizing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
-
- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Coating With Molten Metal (AREA)
Description
Λ C 1976/7910.Λ C 1976/7910.
i î t j; .i î t j; .
CENTRE DE RECHERCHES METALLURGIQUES -CENTRUM V00R RESEARCH IN DE METALLURGIE,METALLURGICAL RESEARCH CENTER -CENTRUM V00R RESEARCH IN DE METALLURGIE,
Association sans but lucratif - vereniging zonder winstoogmerk à BRUXELLES, (Belgique).Non-profit association - vereniging zonder winstoogmerk in BRUXELLES, (Belgium).
Procédé pour le traitement superficiel de tôles d'acier.Process for the surface treatment of steel sheets.
La présente invention concerne un procédé pour le traitement superficiel de tôles d'acier, en vue de leur conférer une meilleure aptitude à la galvanisation à chaud.The present invention relates to a method for the surface treatment of steel sheets, in order to give them a better suitability for hot-dip galvanizing.
On connaît depuis longtemps des procédés de galvanisation à chaud comportant, avant l'immersion des tôles dans le bain de zinc, un traitement thermique sous une atmosphère constituée de et N^, destiné à réduire l'oxyde présent à la surface des tôles. Ce traitement thermique était effectué à une température élevée, de l'ordre d'au moins 600°C, et pouvait/^/ m 2.- affecter les propriétés mécaniques de l'acier.Hot galvanizing processes have been known for a long time, comprising, before immersion of the sheets in the zinc bath, a heat treatment under an atmosphere consisting of and N 3, intended to reduce the oxide present on the surface of the sheets. This heat treatment was carried out at a high temperature, of the order of at least 600 ° C, and could / ^ / m 2.- affect the mechanical properties of the steel.
On connaît par ailleurs un procédé, développé par le même demandeur, permettant d'obtenir des tôles possédant d'excellentes propriétés mécaniques, au moyen d'une trempe dans un bain aqueux maintenu sensiblement à sa température d'ébullition. A la sortie de ce bain, les tôles portent cependant un film d'oxyde qu'il est nécessaire d'éliminer, en particulier lorsque ces tôles doivent recevoir ultérieurement un revêtement, par exemple par galvanisation. En outre, ces tôles subissent généralement, après le refroidissement, un traitement de survieillissement destiné à régler leurs propriétés mécaniques. Toutefois, les températures at- v teintes par ce traitement restent inférieures à celles que nécessite l'élimination de la couche d'oxyde superficielle par une-atmosphère réductrice.A process is also known, developed by the same applicant, making it possible to obtain sheets having excellent mechanical properties, by means of quenching in an aqueous bath maintained substantially at its boiling temperature. At the exit of this bath, the sheets however carry an oxide film which it is necessary to remove, in particular when these sheets must subsequently receive a coating, for example by galvanization. In addition, these sheets generally undergo, after cooling, an overaging treatment intended to regulate their mechanical properties. However, the temperatures reached by this treatment remain lower than those necessitated by the removal of the surface oxide layer by a reducing atmosphere.
Par son brevet belge N° 840.316, le demandeur a déjà proposé un procédé consistant à favoriser la formation d' une couche continue d'oxyde à la surface de la tôle, puis à éliminer cet oxyde par voie électrolytique. La tôle est ensuite portée, sous atmosphère protectrice, à la température requise pour son introduction dans le bain de métal de revêtement.By its Belgian patent N ° 840.316, the applicant has already proposed a process consisting in promoting the formation of a continuous layer of oxide on the surface of the sheet, then in eliminating this oxide by electrolytic means. The sheet is then brought, under a protective atmosphere, to the temperature required for its introduction into the coating metal bath.
Suivant une variante de ce procédé, l'oxyde n' est éliminé que sur une seule face de la tôle.According to a variant of this process, the oxide is removed only on one side of the sheet.
La présente invention a pour objet une variante de la méthode utilisée pour éliminer l'oxyde.The present invention relates to a variant of the method used to remove the oxide.
Le procédé qui fait l'objet de la présente invention, dans lequel on chauffe la tôle à une température comprise entre 400 et 950°C en vue de lui conférer les propriétés voulues et en applique à cette tôle un traitement comportant une immersion dans un bain aqueux maintenu à une température supérieure à 75°C, est essentiellement caractérisé en ce que l'on soumet au moins une des faces de la dite tôle à un traitement au moyen d'une solution/ à action fluxante et décapante. // Ί.The process which is the subject of the present invention, in which the sheet is heated to a temperature between 400 and 950 ° C. in order to give it the desired properties and applies to this sheet a treatment comprising immersion in a bath aqueous maintained at a temperature above 75 ° C, is essentially characterized in that at least one of the faces of said sheet is subjected to a treatment by means of a solution / with fluxing and pickling action. // Ί.
* « 3 . -* "3. -
Selon l'invention, le traitement de la tôle d' acier au moyen d'une solution à action fluxante et décapante i peut être effectué en différents endroits de la ligne de traite ment, en fonction notamment de la composition de l'acier et de | son utilisation ultérieure.According to the invention, the treatment of the steel sheet by means of a fluxing and pickling solution i can be carried out at different places on the processing line, depending in particular on the composition of the steel and | its subsequent use.
1 Selon un mode préférentiel de mise eh oeuvre du ! procédé de l'invention, la solution à action fluxante et décapante i I est introduite directement dans le bain aqueux de refroidissement * de la tôle.1 According to a preferential mode of implementation of! process of the invention, the fluxing and pickling solution i I is introduced directly into the aqueous cooling bath * of the sheet.
I Selon une autre modalité de mise en oeuvre du procédé de l'invention, le traitement par la solution à action fluxante et décapante est effectué dans un bain distinct du bain aqueux de refroidissement.I According to another embodiment of the process of the invention, the treatment with the fluxing and pickling solution is carried out in a bath separate from the aqueous cooling bath.
A la sortie du bain contenant la solution à action fluxante et décapante, les tôles ne portent plus d'oxyde superficiel et sont en outre pourvues d'un film qui, d'une part, les protège contre l'oxydation et d'autre part, permet de déposer aisément sur la tôle un revêtement constitué de métaux ou d'alliages à bas point de fusion, par exemple de zinc, de plomb, d' I étain ou de leurs alliages.Leaving the bath containing the fluxing and pickling solution, the sheets no longer carry surface oxide and are further provided with a film which, on the one hand, protects them against oxidation and on the other hand , allows to easily deposit on the sheet a coating consisting of metals or alloys with a low melting point, for example zinc, lead, tin or their alloys.
Parmi les solutions à action fluxante et décapante utilisables, il est particulièrement avantageux de choisir j 1 le NH^Cl - ZnC^ qui permet de déposer sur la tôle un film de protection conservant son efficacité jusqu'à la température du bain de métal de revêtement. Il en résulte que le film protecteur n'est pas altéré par le traitement éventuel de survieillissement appliqué à la tôle, et qu'il reste actif jusqu'à l'introduction de la tôle dans le bain de métal de revêtement.Among the fluxing and stripping solutions which can be used, it is particularly advantageous to choose j 1 NH ^ Cl - ZnC ^ which makes it possible to deposit on the sheet a protective film retaining its effectiveness up to the temperature of the coating metal bath . As a result, the protective film is not affected by the possible overaging treatment applied to the sheet, and it remains active until the sheet is introduced into the coating metal bath.
Dans certains cas, la tôle peut devoir être stockée pendant un certain temps avant d'être revêtue. Elle / “ ».—- —- - -y 4.- II est alors avantageux, toujours selon l'invention, d'appliquer le traitement à l'aide de la solution fluxante et décapante en fin de ligne, après survieillissement éventuel.In some cases, the sheet may need to be stored for some time before being coated. It / “” .—- —- - -y 4.- It is then advantageous, still according to the invention, to apply the treatment using the fluxing and stripping solution at the end of the line, after possible overaging.
Dans ce cas, la tôle quittant le four de survieillissement traverse un bain contenant la solution à action fluxante et décapante, est séchée puis bobinée.Avant de procéder au revêtement, il suffira de la réchauffer à la température appropriée.In this case, the sheet leaving the aging furnace passes through a bath containing the fluxing and pickling solution, is dried and then wound. Before coating, it will suffice to reheat it to the appropriate temperature.
La solution à action fluxante et décapante peut également, suivant l'invention, être appliquée par d'autres moyens, en particulier par des moyens mécaniques, tels que/> / dispositifs de projection, brosses, tampons, etc... / //According to the invention, the solution with fluxing and stripping action can also be applied by other means, in particular by mechanical means, such as /> / projection devices, brushes, pads, etc ... / //
TT
00
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU81756A LU81756A1 (en) | 1979-10-04 | 1979-10-04 | PROCESS FOR THE SURFACE TREATMENT OF STEEL SHEET |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU81756 | 1979-10-04 | ||
| LU81756A LU81756A1 (en) | 1979-10-04 | 1979-10-04 | PROCESS FOR THE SURFACE TREATMENT OF STEEL SHEET |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU81756A1 true LU81756A1 (en) | 1981-06-04 |
Family
ID=19729258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU81756A LU81756A1 (en) | 1979-10-04 | 1979-10-04 | PROCESS FOR THE SURFACE TREATMENT OF STEEL SHEET |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU81756A1 (en) |
-
1979
- 1979-10-04 LU LU81756A patent/LU81756A1/en unknown
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1013785B2 (en) | Process for manufacturing of a part from a hot-rolled sheet | |
| WO2009118466A1 (en) | Method for coating a metal strip and equipment for implementing said method | |
| LU81756A1 (en) | PROCESS FOR THE SURFACE TREATMENT OF STEEL SHEET | |
| FR2844281A1 (en) | VERY HIGH MECHANICAL STRENGTH STEEL AND METHOD FOR MANUFACTURING A SHEET OF SUCH A ZINC COATED STEEL OR A ZINC ALLOY | |
| BE468546A (en) | Improvements in manufacturing processes for objects protected by a metal | |
| EP0235067B1 (en) | Method for the protective coating of metallurgical products | |
| CA1215889A (en) | Process and installation for the manufacture of overaged steel strip with zn, a1, alloy coating | |
| BE1000432A6 (en) | Method for improving the corrosion resistance of steel rebar and self-quenching income. | |
| US2007221A (en) | Coating process | |
| EP0496678A1 (en) | Process for continuous galvanizing at high temperature | |
| JPH11189857A (en) | Method for hot-dip galvanizing steel material in two stages plating | |
| BE394649A (en) | ||
| EP0111039A1 (en) | Process for the high speed continuous galvanizing and annealing of a metallic wire | |
| RU2628182C2 (en) | Treatment method for moving ferroalloy sheet and continuous production line for its implementation | |
| CH627382A5 (en) | PROCESS FOR SPINNING AND HARDENING HIGH RESISTANCE ALUMINUM ALLOYS. | |
| Hershman et al. | A note on the peeling of the zinc layer in galvanised coatings | |
| LU86247A1 (en) | AQUEOUS FLOW FOR A HOT GALVANIZATION PROCESS OF A FERROUS PRODUCT | |
| BE508170A (en) | ||
| JP3363361B2 (en) | Wire drawing method of aluminum alloy containing magnesium | |
| BE1011315A6 (en) | Method for forming a zinc-aluminium coating on a steel component and a component coated in this way | |
| CH171386A (en) | Process for the manufacture of a metallic article with a covering layer of aluminum or of an aluminum alloy, installation for implementing this process and article obtained according to the latter. | |
| BE411983A (en) | ||
| BE347973A (en) | ||
| JPH04176852A (en) | Aluminum-zinc alloy hot-dipping method | |
| BE514783A (en) |