BE897650A - Zinc-aluminium hot dip coating baths - contg. boron, titanium and/or zirconium for grain refining - Google Patents
Zinc-aluminium hot dip coating baths - contg. boron, titanium and/or zirconium for grain refining Download PDFInfo
- Publication number
- BE897650A BE897650A BE6047867A BE6047867A BE897650A BE 897650 A BE897650 A BE 897650A BE 6047867 A BE6047867 A BE 6047867A BE 6047867 A BE6047867 A BE 6047867A BE 897650 A BE897650 A BE 897650A
- Authority
- BE
- Belgium
- Prior art keywords
- zinc
- less
- titanium
- boron
- zirconium
- Prior art date
Links
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
- C23C2/12—Aluminium 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
- C23C2/04—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
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- 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
Hot dip coating baths, contg. zinc and 9-70 (pref. max. 40)% Al, additionally contain one or more of B, Ti and Zr, pref. in amt. less than 1%. - Pref. the baths comprise Zn, 3-7% Al and one or more of 0.005-0.050% B, 0.005-0.050% Ti and less than 0.5% Zr. When B and Ti are added together, the B:Ti ratio is pref. 1:5. - The baths are useful for hot dip galvanising of steel sheet e.g. for the automobile industry. The additive gives reduced spangling and a structure of good homogeneity, by grain refining the galvanised coating.(0/0)
Description
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CENTRE DE RECHERCHES METALLURGIQUESCENTRUM VOOR RESEARCH IN DE METALLURGIE, Association sans but lucratifVereniging zonder winstoogmerk à BRUXELLES, (Belgique). Bain pour revêtement à chaud. La présente invention a trait à un bain pour revêtement à chaud et plus particulièrement un bain tel qu'utilisé en galvanisation, lorsque l'on procède au dépôt de zinc ou d'alliages de zinc sur un substrat métallique tel que l'acier.
Il est connu depuis longtemps de recourir à la galvanisation pour protéger les tôles d'acier contre la corrosion. Au fil du temps, on a étendu les applications des tôles galvanisées, par exemple dans l'industrie automobile, et on a aussi diversifié
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les revêtements en créant des alliages à base de zinc plus ou moins complexes.
En général, les critères considérés sont les suivants : - l'aspect visuel de la surface ; - le poli du dépôt ; - l'aptitude à la peinture, - l'homogénéité de la structure du revêtement et de ses propriétés.
En ce qui concerne l'aspect de la surface,. un des problèmes majeurs a trait au fleurage, c'est-à-dire à l'apparition de dessins sur la surface du revêtement.
Une solution proposée afin de diminuer ce fleurage consiste en un refroidissement accéléré après passage dans le bain de galvanisation. On utilise à cet effet des systèmes dits de minimisation du fleurage qui projetent sur le revêtement de la vapeur d'eau chargée en inoculants, poussières de zinc, etc...
Toutefois, ces systèmes sont coûteux, difficiles dans leur mise en oeuvre et ils compliquent le travail d'une installation de galvanisation.
Le bain, objet de la présente invention, permet d'obtenir un revêtement dont le fleurage est très faible et qui de plus donne naissance à une structure dont l'homogénéité est très bonne.
Ce bain est issu d'un bain conventionnel pour revêtement à chaud auquel on a ajouté un ou plusieurs éléments choisis judicieusement pour leur action d'affinage du grain du revêtement obtenu.
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Le bain pour revêtement à chaud, objet de la présente invention, comportant du zinc, de 0 à 70 % d'aluminium et éventuellement d' autres éléments, est essentiellement caractérisé en ce qu'il contient aussi du bore et/ou du titane et/ou du zirconium ; ces trois éléments pouvant être seuls ou sous forme de toute combinaison possible entre eux ou avec d'autres éléments.
Suivant une première modalité de réalisation du bain de l'invention, il comporte principalement du zinc et au maximum 40 % d' aluminium.
Suivant une deuxième modalité de réalisation du bain de l'invention, il comporte entre 3 % et 7 % d'aluminium.
Suivant une autre modalité de réalisation du bain de l'invention, il comporte du mischmetall ; le terme mischmetall étant un terme générique pour désigner les alliages à base de lanthane et de cerium et d'autres terres rares.
Suivant encore une autre modalité de réalisation du bain de l'invention, il comporte du Pb, Sn, Ca, Cu, Mg, Co, Sb, Be en proportion inférieure à 1 % ; de préférence inférieure à 0,5 %.
Suivant une modalité préférentielle de l'invention, la teneur en bore est inférieure à 1 %, de préférence comprise entre 0,005 et 0,050 %.
Suivant une sixième modalité de réalisation de l'invention, la teneur en titane est inférieure à 1 %, de préférence comprise entre 0,005 et 0,050 %.
Suivant une septième modalité de réalisation de l'invention, la teneur en zirconium est inférieure à 1%, de préférence inférieure à 0,5 %.
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Suivant une autre modalité de réalisation de l'invention, le rapport entre les teneurs en bore et en titane est voisin de 1 : 5.
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CENTRUM FOR METALLURGICAL RESEARCHCENTRUM VOOR RESEARCH IN DE METALLURGIE, Non-profit associationVereniging zonder winstoogmerk in BRUXELLES, (Belgium). Bath for hot coating. The present invention relates to a bath for hot coating and more particularly a bath as used in galvanizing, when one proceeds to the deposition of zinc or zinc alloys on a metallic substrate such as steel.
It has long been known to use galvanization to protect steel sheets from corrosion. Over time, we have expanded the applications of galvanized sheets, for example in the automotive industry, and we have also diversified
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coatings by creating more or less complex zinc-based alloys.
In general, the criteria considered are as follows: - the visual appearance of the surface; - the polish of the deposit; - the ability to paint, - the homogeneity of the structure of the coating and its properties.
Regarding the appearance of the surface. one of the major problems relates to flowering, that is to say the appearance of patterns on the surface of the coating.
One solution proposed to reduce this flowering consists of accelerated cooling after passage through the galvanizing bath. For this purpose, so-called flowering minimization systems are used which spray water vapor loaded with inoculants, zinc dust, etc. onto the coating.
However, these systems are expensive, difficult in their implementation and they complicate the work of a galvanizing installation.
The bath, object of the present invention, makes it possible to obtain a coating whose flowering is very weak and which also gives rise to a structure whose homogeneity is very good.
This bath comes from a conventional bath for hot coating to which one or more elements have been added chosen judiciously for their action of refining the grain of the coating obtained.
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The bath for hot coating, object of the present invention, comprising zinc, from 0 to 70% aluminum and possibly other elements, is essentially characterized in that it also contains boron and / or titanium and / or zirconium; these three elements can be alone or in the form of any possible combination between them or with other elements.
According to a first embodiment of the bath of the invention, it mainly comprises zinc and at most 40% aluminum.
According to a second embodiment of the bath of the invention, it comprises between 3% and 7% of aluminum.
According to another embodiment of the bath of the invention, it comprises mischmetall; the term mischmetall being a generic term to designate alloys based on lanthanum and cerium and other rare earths.
According to yet another embodiment of the bath of the invention, it comprises Pb, Sn, Ca, Cu, Mg, Co, Sb, Be in proportion less than 1%; preferably less than 0.5%.
According to a preferred embodiment of the invention, the boron content is less than 1%, preferably between 0.005 and 0.050%.
According to a sixth embodiment of the invention, the titanium content is less than 1%, preferably between 0.005 and 0.050%.
According to a seventh embodiment of the invention, the zirconium content is less than 1%, preferably less than 0.5%.
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According to another embodiment of the invention, the ratio between the boron and titanium contents is close to 1: 5.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE6047867A BE897650A (en) | 1983-08-31 | 1983-08-31 | Zinc-aluminium hot dip coating baths - contg. boron, titanium and/or zirconium for grain refining |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE897650 | 1983-08-31 | ||
BE6047867A BE897650A (en) | 1983-08-31 | 1983-08-31 | Zinc-aluminium hot dip coating baths - contg. boron, titanium and/or zirconium for grain refining |
Publications (1)
Publication Number | Publication Date |
---|---|
BE897650A true BE897650A (en) | 1984-02-29 |
Family
ID=25660354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE6047867A BE897650A (en) | 1983-08-31 | 1983-08-31 | Zinc-aluminium hot dip coating baths - contg. boron, titanium and/or zirconium for grain refining |
Country Status (1)
Country | Link |
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BE (1) | BE897650A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103498122A (en) * | 2013-09-11 | 2014-01-08 | 常州大学 | Zn-Al-Zr-B alloy for hot dipping and preparation method thereof |
-
1983
- 1983-08-31 BE BE6047867A patent/BE897650A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103498122A (en) * | 2013-09-11 | 2014-01-08 | 常州大学 | Zn-Al-Zr-B alloy for hot dipping and preparation method thereof |
CN103498122B (en) * | 2013-09-11 | 2016-01-27 | 常州大学 | A kind of preparation method of Zn-Al-Zr-B alloy used for hot dip galvanizing |
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