BE450875A

BE450875A -

Info

Publication number: BE450875A
Authority: BE

Description

       

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 procédé pour le placage des objets en fer ou en acier. 



   La présente invention a pour objet un procédé de placage convenant pour les objets en fer ou en acier, et consiste en ce que la surface des objets à plaquer, ainsi que, le cas échéant, le côté intérieur à souder à la matière de base, des plaques de couverture sont revêtus préalablement, soit par   immersion,   soit par vaporisation ou par jet, d'une mince couche d'un matériau qui reste exempt d'oxydation au moins jusqu'à sa température de soudure, et qu'à la suite de cette opération, les plaques de couverture sont réunies aux objets par une opération de laminage effectuée à la dite température de soudure. L'expérience démontre qu'une légère pression de laminage est suffisante pour donner une adhérence parfaite.

   Comme matériau des minces couches intermédiaires à appliquer sui- 

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 vaut l'invention, on prend de préférence l'aluminium ou un quelconque de ses alliages. Il est avantageux de produire ces coucnes intermédiaires par jet; en vue de réaliser une adherence plus forte, on peut, avant de procéder au laminage des plaques de couverture sur les objets, laminer les dites couches   intermédiaires,   et ce, de préférence à la température de   soudu@e   du matériau dont elles sont composées. :si les plaques de couverture elles-mêmes sont en aluminium ou en alliage d'aluminium, il n'est pas nécessaire de les revêtir d'une couche intermédiaire de ce métal.

   De telles couches sont,   @u   contraire, toujours à employer, lorsque les plaqués de couverture et les couches   intermédiaires   sont de matériaux difrérents, p.exemple,lorsque les plaques de couverture sont en acier résistant aux températures élevées ou en acier inoxydable, alors que les   conçues   intermédiaires sont en aluminium . 



  Il est également possible d'augmenter encore l'adhérence par un recuit de diffusion executé après le laminage des plaques sur les objets. 



   Le procède suivant l'invention est propre à fournir des métaux multiples, en partant des métaux d'alliage les plus divers, et en particulier à fournir du métal compound, ainsi que des placages inoxydables et résistant aux températures élevées. Le procédé peut, en outre, être employé avantageusement pour la fabrication de bimétaux thermiques, p.exemple, de ceux composés de fer et d'aluminium.



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 process for plating iron or steel objects.



   The present invention relates to a plating process suitable for iron or steel objects, and consists in that the surface of the objects to be plated, as well as, where appropriate, the inner side to be welded to the base material, cover plates are coated beforehand, either by immersion, or by vaporization or by jet, with a thin layer of a material which remains free from oxidation at least up to its welding temperature, and that subsequently from this operation, the cover plates are joined to the objects by a rolling operation carried out at said welding temperature. Experience shows that a light rolling pressure is sufficient to give perfect adhesion.

   As a material for thin intermediate layers to be applied following

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 is worth the invention, preferably aluminum or any of its alloys. It is advantageous to produce these intermediate layers by jet; in order to achieve a stronger adhesion, it is possible, before proceeding with the rolling of the cover plates on the objects, to laminate said intermediate layers, and this, preferably at the weld temperature of the material of which they are composed. : If the cover plates themselves are made of aluminum or an aluminum alloy, it is not necessary to cover them with an intermediate layer of this metal.

   Such layers are, on the contrary, always to be employed, when the cover plates and the intermediate layers are of different materials, for example, when the cover plates are made of steel resistant to high temperatures or stainless steel, while the intermediate designs are in aluminum.



  It is also possible to further increase the adhesion by diffusion annealing carried out after the plates have been laminated to the objects.



   The process according to the invention is suitable for providing multiple metals, starting from the most diverse alloying metals, and in particular for providing compound metal, as well as stainless and high temperature resistant plating. The process can further be advantageously employed for the manufacture of thermal bimetals, eg, those composed of iron and aluminum.

Claims

R E V E N D I C A T I O N S.

1. A plating process suitable for iron or steel objects, characterized in that the surface of the objects to be plated, as well as, where appropriate, the inner side of the cover plates are first coated, either by dipping or vaporization, or especially by jet, of a thin layer of a material which remains free from oxidation at least up to its soldering temperature, and in that, following this operffll <Desc / Clms Page number 3> tion, the cover plates are joined to the objects by a rolling operation performed at said welding temperature.

3. Method according to claim 1, characterized in that the material used for the thin coatings to be applied is aluminum or any of its alloys.

3. Method according to claims 1 and 2, characterized in that the cover plates are made of aluminum or one of its alloys, of steel resistant to high temperatures or of stainless steel.

4. A method according to claims 1 to 3 characterized in that, before the final rolling, to unite the cover plate to the object, the objects to be plated, as well as the cover slips themselves, provided with all the two of their intermediate layers, are rolled at the solder temperature of the material of the intermediate layers.

5: Process according to claims 1 to 4, characterized in that the actual plating of the objects being completed, the assembly is subjected to diffusion annealing.

6. Application 'of the process according to claims 1 to 5 to the manufacture of thermal bimetals, particularly those composed of iron and aluminum.

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