WATER SOLUBLE FLUX FOR SOLDERING Russian patent published in 2019 - IPC B23K35/363 

FIELD: chemistry.

SUBSTANCE: invention relates to compositions of fluxes for low-temperature soldering with high heat resistance. Water-soluble flux contains components in the following ratio, wt%: glycerol 60–62, sorbitol 27–28, alkali 8–9, inhibitor in form of sodium tetraborate or boric acid 2–4. Introduction of flux inhibitor reduces fluxing oxidation of glycerin and sorbitol with alkali.

EFFECT: flux ensures soldering at temperatures of up to 350 °C due to its high heat-resistance to oxidation while preserving fluxing activity, and also provides complete washing of flux residues with water after soldering.

1 cl, 2 tbl, 1 ex