FLUX FORMING INSOLUBLE SOLDERING RESIDUE Russian patent published in 2014 - IPC B23K35/363 B23K103/10 

FIELD: chemistry.

SUBSTANCE: group of inventions can be applied in realisation of solid soldering of aluminium details, for example heat-exchangers. Flux, applied in aluminium soldering, contains basic flux, applied for solid soldering, which includes K₂AlF₅ or, K₂AlF₅-forming precursor, during soldering, and Li-salt in a quantity, which corresponds to a value from 80% to 120% of the quantity, which is stoichiometrically necessary for conversion of all K₂AlF₅ in K₂LiAlF₆ during soldering. Very suitable are lithium fluorides and especially lithium fluroaluminates. Flux and Li-salt can be dispersed in water or in a water composition separately.

EFFECT: addition of Li-compounds to basic flux in specified quantities makes it possible to increase stability against corrosion, conditioned by contact with immovable water or water compositions, such as refrigerating water.

18 cl, 11 ex