Abstract: A prefluxed, flux retaining aluminum-based component is provided comprising a solidified coating layer having flux particles embedded into the coating layer. A method for producing such components comprises steps of applying a molten metallic coating to an aluminum-based component, maintaining the coating in a molten state, driving flux particles against the coating, and cooling the component to solidify the coating and thereby fix the particles firmly in the solidified coating.

Abstract: An improved process is provided for forming a zinc-base alloy coating on an aluminum alloy profile, such as a tube or microtube used in the assembling and brazing of a heat exchanger which is suitable for automotive applications. The process of the present invention is a continuous, high speed coating technique which can utilize aluminum alloy profiles on which an aluminum oxide layer is present. Accordingly, the present invention encompasses an operation by which the aluminum oxide layer is removed so as to enable the zinc-base alloy to metallurgically adhere to the surface of the aluminum alloy profile. The process of this invention also is capable of closely controlling the thickness of the zinc-base alloy coating, such that a sufficient but minimal amount of coating is present to furnish corrosion protection as well as provide sufficient filler metal for a subsequent soldering or low temperature brazing operation.

Abstract: A method of joining Al-members, includes providing at least one member with a thin coating layer of zinc/zinc alloy metal. Interface alloys of Al and Zn are melted and progressively formed from the Al-members with increasing temperature thereof in a brazing furnace.

Abstract: An apparatus for measuring the thickness of a coating of, for example, paint or other electrically non-conductive material on a metallic base comprises a sensor head housing an electrical measuring coil and supported above the coating on a cushion of air. The air is supplied at a constant predetermined pressure to nozzles carried by the sensor head, and a constant force urging the sensor head towards the surface of the material is yieldably applied to the sensor head through a spring.