Lead-free solder environmental-protection scaling powder used for soldering capacitor with film adhered on surface

Abstract

The invention discloses a lead-free solder environmental-protection scaling powder used for soldering a capacitor with a film adhered on a surface, which contains 4-17 percent of rosin and derivates thereof, 3-9 percent of organic acid activating agent, 1.5-3.5 percent of diethylamine hydrochloride and / or cyclohexylamine hydrochloride, 0.3-0.7 percent of surface active agent and 70-90 percent of dissolvant. Firstly, the rosin and the derivate thereof, the organic acid activating agent and the diethylamine hydrochloride and / or the cyclohexylamine hydrochloride are added to the dissolvant to bestirred evenly; then the surface active agent is added to be continuously stirred evenly; and finally, the solution is filtered by gauze so as to remove solid impurities, and finally, light yellow clear and transparent liquid is obtained. The solder has the advantages of strong wetting power and superior solderability and can improve the soldering performance of the lead-free solder; the solderedsoldering tin has even spreading, bright and smooth surface, high surface insulation resistance and superior electrical property and meets the environmental protection requirements.

Description

technical field [0001] The invention relates to a flux, in particular to a lead-free solder environment-friendly flux used for welding surface-mounted film capacitors. Background technique [0002] Flux is usually a mixture of rosin as the main component, which is an auxiliary material to ensure the smooth progress of the soldering process. Welding is the main process in electronic assembly. Flux is an auxiliary material used in welding. Flux can assist heat conduction, remove oxides, reduce the surface tension of the material to be welded, remove oil on the surface of the material to be welded, increase the welding area, and prevent re-occurrence. Oxidation and other aspects of the role, through the use of flux, so that the metal surface to achieve the necessary cleanliness, it prevents re-oxidation of the surface during soldering, reduces the surface tension of the solder, and improves soldering performance. The quality of flux performance directly affects the quality of ...

AI Technical Summary

Problems solved by technology

However, the existing lead-free solder flux still has the following deficiencies in the use of surface-mounted film capacitors: one is that there are many residues; the other is that the effect of tinning is poor; the third is that the solderability is poor; the fourth is that Electrical performance declines after tinning