Components coated with an aluminum-silicon alloy
AssigneeSolvay Pharmaceuticals GmbH
InventorsUlrich Seseke-Koyro, Joachim Frehse, Andreas Becker
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Abstract
Components composed of aluminum or an aluminum alloy with a coating comprising an aluminum-silicon alloy deposited thereon by applying an alkali metal fluorosilicate and heating the resulting treated material. The alloy layer is effectively protected against re-oxidation by a non-corrosive, alkali metal fluoroaluminate layer (e.g. a potassium fluoroaluminate layer) which forms simultaneously.
Claims24
A process for producing a component of aluminum or an aluminum alloy with a coating comprising alkali metal hexafluorosilicate, said process comprising applying a flux consisting essentially of alkali metal hexafluorosilicate to the component by a dry fluxing process or a wet fluxing process wherein a slurry or a paste in an organic solvent is used.
A process for producing a component of aluminum or an aluminum alloy with a coating that comprises an aluminum-silicon alloy, said process comprising applying a flux consisting essentially of alkali metal hexafluorosilicate to the component, wherein a slurry or a paste in an organic solvent is used, and heating the component until the aluminum-silicon alloy is formed.
A process for joining components of aluminum or aluminum alloys, said process comprising coating the components by applying a flux consisting essentially of an alkali metal hexafluorosilicate wherein a slurry or a paste in an organic solvent is used, placing the components in contact, and brazing the components together.
A composition of matter consisting essentially of a mixture of at least one alkali metal fluoro silicate and at least one alkali metal fluoroaluminate, wherein the alkali metal fluoroaluminate is present in an amount of up to 5 wt % of the alkali metal fluorosilicate.
Dependencies are inferred from the claim text.