| 摘要 |
PURPOSE:To decrease corrosiveness to base metals, etc. and to improve a joining effect by incorporating a chelate agent which forms a chelate compd. with the essential components of solder and contg. a specific weight % of 5-sulfosalicylic acid, etc. as an activating agent into a flux. CONSTITUTION:A chelate agent which dissolves in an org. solvent suchas alcohol or the like and forms selectively a ochelate compd. with the essential components of solder is incorporated as an activating agent into a flux. One kind of any among 0.2-20% 5-sulfosalicylic acid, 0.5-10% morin, 1-10% sodium diethyldithiocarbamic acid and 2-10% thiourea is incorporated as an activating agent into the chelate agent. The corrosiveness to the base metals to be joined is thereby considerably suppressed and the excellent flux effect is obtd. even at a low temp. the effect of joining is thus improved even in joining at a low heat resistant temp. |
