BORIC ACID-FREE FLUX FOR BRAZING METAL MATERIALS

摘要

The invention relates to flux containing no boric acid made from inorganic boron compounds for brazing metallic materials in connection with silver-, copper- or nickel-based solders and which leads to a good wetting of the workpieces for connection, characterised by residues of low corrosivity. According to the invention, the boron compounds include potassium pentaborate and potassium metaborate and the weight proportion of potassium pentaborate and potassium metaborate lies in the range between 4 and 10.The flux preferably contains no fluoro compounds no chloro compounds and no borax.