EP0769567B1 - Procédé pour revêtir une tôle - Google Patents
Procédé pour revêtir une tôle Download PDFInfo
- Publication number
- EP0769567B1 EP0769567B1 EP96402089A EP96402089A EP0769567B1 EP 0769567 B1 EP0769567 B1 EP 0769567B1 EP 96402089 A EP96402089 A EP 96402089A EP 96402089 A EP96402089 A EP 96402089A EP 0769567 B1 EP0769567 B1 EP 0769567B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- metal layer
- agglomerates
- layer
- sheet
- 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
- 238000000034 method Methods 0.000 title claims description 18
- 238000000576 coating method Methods 0.000 title abstract description 18
- 239000011248 coating agent Substances 0.000 title abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 71
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 34
- 238000000889 atomisation Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000010410 layer Substances 0.000 claims description 50
- 238000005507 spraying Methods 0.000 claims description 12
- 238000005246 galvanizing Methods 0.000 claims description 7
- 239000011247 coating layer Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 238000007598 dipping method Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000003618 dip coating Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000007970 homogeneous dispersion Substances 0.000 description 1
- 239000006193 liquid solution Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 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
- C23C2/26—After-treatment
- C23C2/265—After-treatment by applying solid particles to the molten coating
Definitions
- the invention relates to a method for treating a metal layer.
- sheet coating in which a powder is sprayed onto the layer metallic when it is, at least partially, in the liquid state
- This process is commonly used during galvanizing of sheets steel, for example to achieve an aspect with a large configuration number of small flowers, as described in document FR-A-2 236 013.
- the sheet is quenched in a bath of liquid metal, we extract the sheet from the bath to cause a layer of said liquid metal on the sheet, a powder is sprayed onto said liquid layer driven and then solidifies said layer.
- a variant of this galvanizing process consists in spraying the powder well after soaking: we heat the sheet to melt, at least partially, the coating layer, we spray the powder on the layer melted, then solidified.
- the powder is inserted into the layer metallic, i.e. generally dispersed or dissolved.
- the sheets coated according to this process exhibit, for example, better surface appearance (disappearance of flowering) or are easier to apply shape (better stampability).
- oxide powders can be used, or mixtures of metallic powders and oxide powders.
- the quality of such coatings depends, among other things, on the morphology of powder and spray conditions on the sheet; these two parameters indeed determine the homogeneity of the distribution of the material projected from a on the surface of the molten metal layer, on the other hand in the depth of this layer.
- patent JP 02 093053 proposes to use powders atomized.
- the projected material comprises several basic components
- the invention aims to treat a metal layer by spraying homogeneously in the depth, and, when the powder of treatment includes several basic components, spread them out one very evenly throughout the metal layer.
- the subject of the invention is a method of treating a metal layer sheet metal coating, especially in a sheet galvanizing line, in which a powder is sprayed onto said metal layer when it is, at least partially, in the liquid state, characterized in that the said preparation is prepared powder by atomization in a manner suitable for it to be present under form of atomization agglomerates gathering elementary grains to dispersing and / or dissolving in said metallic layer in the liquid state, to that the average size of said agglomerates is greater than the thickness of said metallic layer in the liquid state, and so that said agglomerates have a sufficiently weak cohesion to disappear under the impact of projection of the agglomerate on said metal layer, so as to ensure the dispersion of the elementary grains of the agglomerate in the part of the said metallic layer which is in the liquid state.
- the invention may also have the characteristic object of the claim 2 and also relates to the use, for implementing the method according to the invention, of a powder having one or more of Characteristics which are the subject of claims 3 to 5.
- an atomization installation is used of a known type and we proceed in a manner known in itself, from the or basic components of the material to be sprayed onto the sheet.
- the atomization installation is supplied from a composition of these basic powders, for example suspensions and / or liquid solutions of these basic powders.
- suspensions in particular colloidal, and / or solutions containing the basic components of the material to be sprayed.
- the feed composition is atomized to form a powder atomized, composed of agglomerates gathering elementary grains of basic powder, possibly of different natures and different morphologies.
- atomization can be used to preformulate a mixture, in the sense that one adapts in a manner known per se the atomization conditions to obtain, within each agglomerate of spray powder, a mixture of grains of the different components in said proportions.
- the conditions are determined in a manner known per se atomization to obtain, according to the invention, agglomerates having a average size greater than the thickness of the molten metal layer after spinning.
- the atomized powder because it consists of agglomerates of large size, can be handled with even less explosive or toxic risk.
- the agglomerates are made up of sufficiently fine elementary grains to ensure a homogeneous dispersion of the material to be sprayed in the layer metallic.
- these elementary grains have an average size less than about half the thickness of the molten metal layer.
- the atomization conditions so that the ratio (average size of agglomerates) / (average size of elementary grains) is greater than approximately 4.
- polyvinyl alcohol can in particular be used.
- sufficient cohesion is meant a cohesion which is preserved in all powder handling operations located between atomization itself and the projection onto the sheet at the outlet of the coating bath.
- weak cohesion cohesion which disappears under the impact projection of the agglomerate on the sheet, to ensure the dispersion of the grains elements of the agglomerate in the metallic layer in the molten state.
- the porosity measurement i.e. the ratio (total pore volume) / (volume total of an agglomerate), is a known means of assessing the cohesion of agglomerates.
- the sheet to be coated is here a steel sheet.
- the metallic coating bath is here a zinc bath.
- the temperature of the metal layer is higher at least about 10 ° C to that of its melting temperature.
- the average size of the agglomerates of the atomized powder being greater than the thickness of the metal layer, it is easier than in art prior to spraying said powder with sufficient energy for the elementary grains are dispersed in the depth of the layer, at vicinity of the sheet metal substrate, which represents an essential advantage of the invention.
- the material to be sprayed contains several components and uses the atomization operation to preformulate a mixture of these components, the piloting constraints of the projection installation; indeed, the mixture being preformulated, one obtains much more easily than in the processes of the prior art a uniform and homogeneous distribution of the elementary grains of the material to project into the metallic layer.
- the elementary grains of heart are silica particles and the coating material consists of particles of metal of the same nature as that of the sheet dipping bath, here by example, zinc particles.
- the periphery of the agglomerates melts first, releasing the oxide particles it contains at heart to disperse them in the molten metal layer.
- the powder to be sprayed thanks to its method of preparation (atomization) and the size of its agglomerates, makes it possible to treat layers metallic (in the molten state) easily and very homogeneously.
- the purpose of this example is to illustrate the invention in the case of a treatment of a metallic layer of coating with a metallic zinc powder.
- this processing takes place in an operation of galvanization, where, after quenching, the metal layer to be treated has a thickness of about 10 ⁇ m.
- a suspension of this base powder is prepared and diluted with polyvinyl alcohol at about 3% by weight (relative to the weight of powder of based).
- This suspension (or feed composition) is atomized so to obtain batches of powder to be sprayed with large agglomerates average between 24 ⁇ m and 56 ⁇ m.
- the porosity of the powders obtained is approximately 33.8% and the porosity internal has an average diameter of 0.06 ⁇ m.
- the metal layer is treated still in the liquid state by spraying a batch of powder and then solidifying.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating By Spraying Or Casting (AREA)
- Coating With Molten Metal (AREA)
- Laminated Bodies (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Powder Metallurgy (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Description
Claims (5)
- Procédé de traitement d'une couche métallique de revêtement de tôle, notamment dans une ligne de galvanisation de tôle, dans lequel on projette une poudre sur ladite couche métallique lorsqu'elle est, au moins partiellement, à l'état liquide, caractérisé en ce que l'on prépare ladite poudre par atomisation d'une manière adaptée :pour qu'elle se présente sous forme d'agglomérats d'atomisation rassemblant des grains élémentaires à disperser et/ou à dissoudre dans ladite couche métallique à l'état liquide,pour que la taille moyenne desdits agglomérats soit supérieure à l'épaisseur de ladite couche métallique à l'état liquide,et pour que lesdits agglomérats présentent une cohésion suffisamment faible pour disparaítre sous l'impact de projection de l'agglomérat sur ladite couche métallique, de manière à assurer la dispersion des grains élémentaires de l'agglomérat dans la partie de ladite couche métallique qui est à l'état liquide.
- Procédé selon la revendication 1, caractérisé en ce que l'on prépare ladite poudre d'une manière adaptée pour que la taille moyenne desdits grains soit inférieure à environ la moitié de l'épaisseur de ladite couche.
- Utilisation d'une poudre atomisée pour mettre en oeuvre le procédé selon l'une quelconque des revendications 1 à 2, caractérisée en ce que sa porosité ouverte, correspondant à des pores de taille supérieure à 0,01 µm, est supérieure à 30%.
- Utilisation d'une poudre atomisée pour mettre en oeuvre le procédé selon l'une quelconque des revendications 1 à 2, caractérisée en ce que le ratio (taille moyenne des agglomérats)/(taille moyenne des grains) est supérieur à environ 4.
- Utilisation d'une poudre atomisée pour mettre en oeuvre le procédé selon l'une quelconque des revendications 1 à 2, caractérisée en ce qu'elle contient des composants de différentes natures et/ou de différentes morphologies.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9512273 | 1995-10-19 | ||
FR9512273A FR2740145B1 (fr) | 1995-10-19 | 1995-10-19 | Procede de revetement de tole |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0769567A1 EP0769567A1 (fr) | 1997-04-23 |
EP0769567B1 true EP0769567B1 (fr) | 2000-01-12 |
Family
ID=9483686
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96402089A Expired - Lifetime EP0769567B1 (fr) | 1995-10-19 | 1996-10-01 | Procédé pour revêtir une tôle |
Country Status (8)
Country | Link |
---|---|
US (1) | US5711990A (fr) |
EP (1) | EP0769567B1 (fr) |
JP (1) | JP3875325B2 (fr) |
AT (1) | ATE188748T1 (fr) |
CA (1) | CA2187860C (fr) |
DE (1) | DE69606132T2 (fr) |
ES (1) | ES2142556T3 (fr) |
FR (1) | FR2740145B1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7413769B2 (en) * | 2005-07-01 | 2008-08-19 | Mcdevitt Erin T | Process for applying a metallic coating, an intermediate coated product, and a finish coated product |
EP2103706A1 (fr) * | 2008-03-17 | 2009-09-23 | CENTRE DE RECHERCHES METALLURGIQUES a.s.b.l., CENTRUM VOOR RESEARCH IN DE METALLURGIE v.z.w. | Alliage de revêtement obtenu par projection de poudre |
US20090252988A1 (en) * | 2008-04-04 | 2009-10-08 | Honeywell International Inc. | Coated components for use in high temperature environments and methods of forming a coating on the component |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3017689A (en) * | 1958-03-27 | 1962-01-23 | United States Steel Corp | Anti-skid tread plate |
JPS4937693B1 (fr) * | 1968-04-25 | 1974-10-11 | ||
BE757252A (fr) * | 1969-10-09 | 1971-03-16 | British Steel Corp | Procédé pour produire un substrat ferreux revetu. |
FR2236013A1 (en) * | 1973-07-06 | 1975-01-31 | Heurtey Metallurgie | Treating galvanised coatings on sheet metal - to give semi- brilliant appearance by seeding molten coating with powdered material |
US4111154A (en) * | 1977-04-11 | 1978-09-05 | Heurtey Metallurgie | Apparatus for the surface treatment of galvanized sheet-iron |
US4568569A (en) * | 1983-02-28 | 1986-02-04 | Stein Heurtey | Method and apparatus for providing composite metallic coatings on metallic strips |
JPS62224699A (ja) * | 1986-03-26 | 1987-10-02 | Nippon Steel Corp | 溶接性に優れたZn系分散めつき鋼板 |
US4873153A (en) * | 1987-06-25 | 1989-10-10 | Occidental Chemical Corporation | Hot-dip galvanized coating for steel |
JPH0293053A (ja) * | 1988-09-29 | 1990-04-03 | Kobe Steel Ltd | 高耐蝕性溶融Zn−Mg系合金めっき鋼板の製造方法 |
-
1995
- 1995-10-19 FR FR9512273A patent/FR2740145B1/fr not_active Expired - Fee Related
-
1996
- 1996-10-01 AT AT96402089T patent/ATE188748T1/de active
- 1996-10-01 ES ES96402089T patent/ES2142556T3/es not_active Expired - Lifetime
- 1996-10-01 EP EP96402089A patent/EP0769567B1/fr not_active Expired - Lifetime
- 1996-10-01 DE DE69606132T patent/DE69606132T2/de not_active Expired - Lifetime
- 1996-10-15 CA CA002187860A patent/CA2187860C/fr not_active Expired - Fee Related
- 1996-10-16 US US08/733,071 patent/US5711990A/en not_active Expired - Lifetime
- 1996-10-18 JP JP29758396A patent/JP3875325B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH09111468A (ja) | 1997-04-28 |
CA2187860A1 (fr) | 1997-04-20 |
FR2740145B1 (fr) | 1997-11-14 |
FR2740145A1 (fr) | 1997-04-25 |
EP0769567A1 (fr) | 1997-04-23 |
JP3875325B2 (ja) | 2007-01-31 |
ES2142556T3 (es) | 2000-04-16 |
DE69606132T2 (de) | 2000-09-28 |
CA2187860C (fr) | 2003-08-05 |
DE69606132D1 (de) | 2000-02-17 |
ATE188748T1 (de) | 2000-01-15 |
US5711990A (en) | 1998-01-27 |
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