PCB boards have lead tin and lead-free tin even have such a difference!
- Release on :2019-01-10
PCB boards have lead tin and lead-free tin even have such a difference! The specific difference is reflected in four aspects, let's take a closer look below!
1. From the surface of tin, there is a brighter lead and tin, and lead-free tin is dim. Lead-free wettability is a little worse than lead.
2. Lead in lead is harmful to the human body, but not lead. The lead eutectic temperature is lower than that of lead-free. How much depends on the composition of lead-free alloys.(Flex printed circuit board supplier)
The eutectic like SNAGCU is 217 degrees and the soldering temperature is eutectic temperature plus 30 to 50 degrees. It depends on the actual adjustment. The lead eutectic is 183 degrees. Lead in mechanical strength, brightness, etc. is better than lead-free.
3. The lead content of lead-free tin does not exceed 0.5, and the lead content reaches 37.
4, lead will improve the activity of the tin wire in the welding process, lead wire is relatively better than the lead-free tin wire, but lead is toxic, long-term use is not good for the human body, and lead-free tin will have a higher melting point than lead-tin. This way the solder joint is much stronger.