Fluoroaluminate fluxes

Barium chloride flux, magnesium refining Cobalt chloride (ous) flux, metal refining/remelting Sodium fluoroaluminate flux, metallurgical... 

Sodium fluoroaluminate flux, purifying sugar Ammonium phosphate, dibasic flux, silver solders Potassium bifluoride flux, smelting Sodium borate flux, soldering... 

As manufactured, potassium fluoroaluminate fluxes typically contain a mixture of KAIF4 and K2ALF5, where the K2ALF5 may or may not be hydrated. During the brazing... 

A potassium fluoroaluminate flux must coutaiu more than just the pure phases - and it must contain these phases in an extremely precise ratio - in order to work effectively and to meet the conditions for eutectic formation which controls the melting point. 

In Composite Deposition technology (CD process) [96], the filler metal for joint formation is derived from a composite powder, a compound consisting of potassium fluoroaluminate flux and Al-Si alloy. The CD powder is deposited selectively and accurately on heat-exchanger components prior to assembly and brazing. 

Controlled atmosphere brazing using non-corrosive potassium fluoroaluminate flux is the dominant process for making all aluminium heat exchangers. 

Of the fluoroaluminates known, cryoflte, ie, sodium hexafluoroaluminate [15096-52-2], Na AlF, has been an integral part of the process for production of aluminum. Recently, the mixtures of potassium tetrafluoroaluminate [14484-69-6], KAIF, and potassium hexafluoroaluminate [13575-52-5], K AlFg, have been employed as bra2ing fluxes in the manufacture of aluminum parts. 

Alcan Recovered Cryolite. [Alcan] Sodium fluoroaluminate (87-90%), aluminum oxide (2%), sodium sulfate (4%), sodium carbonate (1-1.5%) source of fluorine as ceramic flux and opacifler aid in the prod, of vitreous enamels, glass, glazes, abrasives metallurgical flux in refining of aluminum and its alloys. 

Potassium fluorometalates and in particular fluorozincate and fluorosilicate have applications in the field of aluminium brazing as so-called reactive fluxes. The nomination reactive stands for the redox reaction that takes place between the flux (KZnp3 or K2SiF6) and the aluminium surface to be brazed. These reactions give rise to formation of elemental Zn or Si and potassium fluoroaluminate, which acts as the actual flux. The elements formed in this way combine and alloy with aluminium, diffusing through the... 

Apart from its use as a flux component for welding and soldering (see below), potassium fluoroaluminate (Fp. 580 °C solubility in water 2 g/1) has been reported as active filler in abrasives in order to stabilize the polymeric matrix against coloiu change due to the heat produced by the mechanical action [70]. 

This technology offers the benefits of a flux for successful o9xide removal, working at atmospheric pressure while avoiding the disadvantages of postbraze treatments and corrosion susceptibility. The nonhygroscopic and noncorrosive potassium fluoroaluminates are used as fluxes [76]. 

P. Garcia and H.-W. Swidersky, Study on the hydrolysis of fluoroaluminates in post-braze flux residues, A.F.C. Holcroft International Invitational Aluminum Brazing Seminar, Novi, October 2008, conference proceedings. 

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