High flux environment-friendly tin wire and preparation method thereof

Abstract

The invention discloses a high flux environment-friendly tin wire and a preparation method thereof. The tin wire consists of a solder and a flux, wherein the content of the solder is 94.2-96.7 mass%, and the content of the flux is 3.3-5.8 mass%; the solder comprises the following alloy components in percentage by mass: 95.0-99.2% of tin, 0.1-3.0% of silver, 0.3-2.2% of copper and 0.01-0.1% of nickel; the flux comprises the following components in percentage by mass: 72-85% of rosin, 1.8-4.5% of solvent, 5-10% of synthetic resins, 0.7-1.2% of benzotriazole, 5-10% of activating agents and 1-5% of surface active agents; and the diameter of the tin wire is preferably 0.1-2 mm. The high flux environment-friendly tin wire is uniform and smooth in surface, is excellent in fluidity after melting, is excellent in wettability, is less in splash during welding, is free of corrosion in residues after welding, is green and environment-friendly, and is low in cost.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a high-flux environment-friendly tin wire and a preparation method thereof. Background technique [0002] Solder is an important raw material for connecting electronic components in the welding circuit, and is widely used in the electronics industry. Solder wire is the most convenient solder for soldering circuit boards. In the solder wire welding process, flux is an indispensable additive. With the strengthening of people's awareness of environmental protection, directives and requirements such as REACH and RoHS restrict flux halogens and substances of high concern, thus putting forward new requirements for solder wire products. At present, there are flux spatters in lead-free solder wires at home and abroad. Large, large amount of halides added, a lot of smoke, the flux contains halogens, the residual flux is prone to cracks, low insulation resistance, high corrosiveness a...

AI Technical Summary

Problems solved by technology

With the strengthening of people's awareness of environmental protection, directives and requirements such as REACH and RoHS restrict flux halogens and substances of high concern, thus putting forward new requirements for solder wire products. At present, there are flux spatters in lead-free solder wires at home and abroad. Large, a large amount of halides are added, there is a lot of smoke, the flux contains halogen, the residual flux is prone to cracks, the insulation resistance is low, and the corrosion is large, etc.

Based on the current development direction of the electronics industry towards green and environmental protection, the solder wire is bound to develop towards halogen-free. Now most companies use halogen-free or low-halogen fluxes, which still have large flux spatter, more smoke during welding, and post-welding residues. Pads are corrosive and polluted