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Method of bonding thermally sprayed coating to non-roughened aluminum surfaces
Method of bonding thermally sprayed coating to non-roughened aluminum surfaces
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机译:将热喷涂涂层粘合到不粗糙的铝表面的方法
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摘要
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.
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