| 摘要 |
The present flux is preferably used in electronics and electricity. The flux is characterized particularly in that welding waste are easily removed, without time-limit and without degradation (auto-oxidative) of the flux itself as it would be the case for example during the activation of the flux by aromatic carboxylic acids. The characteristics in relation to corrosion and surface resistance, as those required by testing conditions according to standards DIN 8516 and DIN 8527 applied to a halogen-free flux, according to DIN 8511, type F-SW 32, are guaranteed. The advantages of said flux are obtained by introducing mono-, di- or poly-carboxylic alicyclic acids presenting at least one carbon ring, or derivatives thereof using mono-, di- or poly- or ceto-carboxylic acids. The properties of the flux may be further improved by using in conjunction quaternary ammonium salts. The base composition disclosed hereabove enables to obtain soft soldering flux having various characteristics, thereby providing a flexibility to their use (for example flux applicable to flux welding processes, welding pastes, constituent envelopes of lead wires or lead cores). |
