![]() It can also provide good surface protection to a slightly higher temperature (up to about 925☌/1700☏) and for a longer time than the white flux. Powdered boron is a very black talcum-like powder, which, when added to the white flux, not only turns the flux to a black color but also increases the flux's ability to absorb more oxygen than white flux. White fluxes are suitable for use when brazing many ferrous and nonferrous metals such as carbon steels, copper and copper alloys.īlack Flux is similar to white flux except that it has additional powdered boron added to its chemistry. Its general characteristics are controlled by a number of industry specifications, including Aerospace Material Specification (AMS) 3410. White Flux offers protection over a temperature range of approximately 320-870☌ (600-1600☏). ![]() The presence of fluorides and borates in the flux enables the flux to be very effective at absorbing oxygen and thus preventing the formation of oxides on the metal surfaces onto which they are painted. There are certain additives, though, that each has in common, namely fluorides and some form of potassium borates. There are a number of manufacturers of these brazing fluxes, and each of their formulas is proprietary as well as being somewhat different from the others. They are both quite suitable for use on a wide variety of base metals when using a silver-based brazing filler metal (BFM). Both of these paste fluxes are water-based and contain fluoride and potassium compounds (making them somewhat acidic). There are two types of paste flux that are commonly available for brazing, differentiated by their color: white flux and black flux. They can be readily thinned down with pure water to achieve this if necessary. Paste fluxes should have a creamy consistency with a viscosity like that of house paint. The most convenient form of flux to use when brazing with a torch or by induction is paste. These fluxes are manufactured in a variety of forms – powder, paste or liquid (for spraying). Brazing fluxes are compounds that are designed to be put onto metal surfaces in order to protect those metal surfaces from oxidation during a brazing process that is being conducted in open air.
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