Why are the tin dots tarnished after soldering

Why are the tin dots tarnished after the solder wire is soldered? The following is introduced by the editor of the Shenzhen solder wire manufacturer:

After the solder wire is soldered, there are several reasons for the tin spots to be dark.

 
First, the tin content of the solder wire is low. Solder wire with a tin content of more than 50% will have a shiny joint, and the soldering effect will be significantly different than that with a lower tin content.

Second, the residue of the flux stays on the surface of the solder joint without cleaning, and its acid substances corrode the solder joint, which will also cause the solder joint to be dull and dull;

Third, the temperature of the soldering iron has not been reached, and the incomplete melting of the solder can also lead to the darkening of the tin spots.

Methods to solve the problem that soldering tin occupies a dull and dull appearance:

First, according to their own products, select regular manufacturers to buy solder wires with high tin content and original tin as much as possible.

2. Disposable solder wire can be selected. Disposable solder wire is formulated with special agents, which will not produce too much adhesion, less smoke from welding, and will not corrode the soldering iron tip. The residue after the soldering of the disposable solder wire is very Less, almost no need to clean.

Third, it is to choose a constant temperature soldering iron or adjust the temperature of the soldering iron to completely melt it according to the melting point of the soldering wire during the soldering operation, so as to achieve the effect of beautiful solder point after soldering.

Shenzhen Xinghongtai Tin Industry Co., Ltd. is a professional solder wire manufacturer. It has specialized in the development and production of solder wires for 12 years. It provides solder wires, lead-free solder wires, lead solder wires, solder wires, solder bars and solder wires of different specifications.