How does solder paste blanch after soldering?!
There is a problem with the solder paste, and you need to consult the manufacturer of solder paste.
The solder paste in this paste is not reasonable, the pH is not balanced, the flux carrier moisture absorption led to white
Because the flux in the solder paste melts at high temperature and volatilize. When the solder paste reaches a certain temperature, the solder paste will melt and become liquid, and the flux will break down and diffuse on the surface and periphery of the tin bath. When the temperature drops, the tin liquid solidifies into tin, and the flux does not decompose and volatilize, and remains. The residue is usually yellow or white.
