Method of bonding thermally sprayed coating to a...

C - Chemistry – Metallurgy – 23 – C

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C23C 4/02 (2006.01)

Patent

CA 2208386

A method of bonding a thermally sprayed coating to a non-roughened light metal (i.e. cast aluminum-based) surface. The method comprises the steps of (a) depositing a flux material (i.e. potassium aluminum's fluoride containing up to 50 molar % other fluoride salts) onto such cast surface which has been cleansed to be substantially free of grease and oils, such deposition providing a dry flux coated surface, the flux being capable of removing oxide on the cast surface and having a melting temperature below that of the cast surface; (b) thermally activating the flux in the flux coated surface to melt and dissolve any oxide residing on the cast surface; and (c) concurrently therewith or subsequent to step (b) thermally spraying metallic droplets or particles onto the flux coated surface to form a metallic coating that is metallurgically bonded to the cast surface.

L'invention porte sur une méthode permettant de lier un revêtement, réalisé par pulvérisation thermique, à une surface non rugueuse d'un métal léger (fonte d'aluminium). La méthode comprend les étapes suivantes: (a) dépôt d'un fondant (fluorure de potassium et d'aluminium contenant jusqu'à 50 % (pourcentage molaire) d'autres fluorures) sur ladite surface ayant subi un nettoyage la rendant essentiellement exempte de graisses et d'huiles, ledit dépôt constituant une surface revêtue d'un fondant sec, ce fondant étant capable de débarrasser la surface des oxydes qui s'y trouvent et possédant une température de fusion inférieure à celle de la surface d'aluminium; (b) activation thermique du fondant dans la surface revêtue d'un fondant en vue de fondre et de dissoudre tout oxyde se trouvant sur la surface d'aluminium; et (c) simultanément ou ultérieurement à l'étape (b) pulvérisation thermique de gouttelettes ou de particules métalliques sur la surface revêtue d'un fondant, en vue de réaliser un revêtement métallique métallurgiquement lié à la surface de fonte d'aluminium.

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