What is the effect of rosin on electric soldering iron
I often see people asking why rosin needs to be added to soldering these days. Here, I have summarized it roughly. Rosin is the most commonly used flux, neutral. If it is a newly printed circuit board, a layer of loose perfume should be coated on the surface of the copper foil before welding. If it is a pre made circuit board, it can be directly soldered. In fact, the use of rosin depends on personal habits. Some people will soak the soldering iron tip on the rosin after welding each component. The use of rosin is also very simple. Open the rosin box and soak the powered soldering iron tip on it. If solid solder is used during welding, adding some rosin is necessary; If rosin solder wire is used, rosin can be omitted.
The role played by rosin in soldering. Rosin will have weak acidity at the temperature of an electric soldering iron, which can clean the oxide layer on the welding surface and allow the solder to infiltrate the welding surface. Nowadays, there is usually rosin in the middle of the solder used in the electronics industry. As long as there is a touch of rosin on the soldering iron, the solder wire can work directly on the soldering iron. The types of fluxes can generally be divided into three major series: organic, inorganic, and resin. Resin flux is usually extracted from the secretions of trees and is a natural product with little corrosiveness. Rosin is the representative of this type of flux, so it is also known as rosin type flux. Because flux is usually used in conjunction with solder, it can be divided into soft flux and hard flux corresponding to solder. The commonly used soft soldering fluxes in the assembly and maintenance of electronic products include rosin, rosin mixed flux, solder paste, and hydrochloric acid. In addition, different welding workpieces should be selected according to different situations. When using flux, it must be applied appropriately according to the area and surface condition of the soldered part. If the amount is too small, it will affect the welding quality. If the amount is too large, the flux residue will corrode the components or deteriorate the insulation performance of the circuit board.
