Soldering Flux (redirected from Flux (metallurgy))

soldering flux [′säd·ə·riŋ ‚fləks]

(metallurgy)

A chemical substance which aids the flow of solder and serves to remove and prevent the formation of oxides on the pieces to be united.

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flux

1. A fusible substance used in oxygen cutting, welding, brazing, or soldering operations; assists in the fusion of metals and the prevention of surface oxidation.

2. A bituminous material, generally liquid, used for softening other bituminous materials.

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Soldering Flux 

a nonmetallic substance used to remove oxide film from solder and the surface of the material being soldered; this prevents the formation of oxide during soldering and also reduces the surface tension of the solder. Fluxes may be powders, pastes, or water, alcohol, or glycerine solutions. Their effect appears only within a certain temperature range. Some fluxes can be used successfully in soldering a variety of materials, whereas others have highly specialized purposes. The most universal fluxes for the high-temperature soldering of steels and copper alloys are those based on Na₂B₄O₇ and H₃BO₃; for low-temperature soldering, the most universal flux is based on ZnCl₂. A flux that is widely used in soldering aluminum alloys contains 8 percent ZnCl₂, 10 percent NaF, 32 percent LiCl, and 50 percent KC1.

REFERENCE

Petrunin, I. E. Fiziko-khmicheskie protsessy pri paike. Moscow, 1972.