Rosin is an insulator. Why is rosin used as a soldering flux in industry? Doesn't that lead to electricity in the wire? When the teacher taught me, he always coated the wires with a layer of rosin, coated with a tin of solder, and soldered the wires to the circuit board with solder. In this way, the rosin on the head does not conduct electricity, will it not affect the circuit?
As the metal surface and air contact, it will produce a layer of oxide film, the higher the temperature, the thicker the oxide layer. This film to prevent liquid solder on the metal infiltration like glass coated with oil will make water cannot infiltration glass flux is a kind of special material to remove the oxide film also called flux rosin in solder wettability. The metal can remove the oxide film on the surface... Now there are special solder paste, rosin less used.
Rosin, also known as pine gum and resin, its formula is C20H30O2, is a weak organic acid, its acid value is about 160. It is non corrosive, non hygroscopic, and has good insulation, more important is it has five basic functions: 1 flux? Can remove oil, sweat, dust and other resistance welding; 2? To prevent welding when heated oxidation; 3? Can enhance the liquidity of solder; 4? After the completion of welding, can protect the cleaning of uniform cooling; 5 easy to clean?.The active component of rosin is mainly rosin acid, which accounts for about 80% to 90% of the total rosin content. At normal temperature, rosin is solid and its activity is almost no action. The melting point of rosin is between 172 and 173 degrees centigrade. When heated to the melting rosin rosin temperature, and then it can play a role of the soldering flux. When the temperature reaches or exceeds 300 degrees, it begins to decompose and carbonization. After cooling, it can be solidified again and lose its activity again. After welding, the residue is evenly distributed, non corrosive, and has good stability and insulation.In the mass production of printed circuit boards, the boards are easy to be contaminated and are usually cleaned thoroughly. 1, three, 1, 1 are usually used as cleaning agents, three dichloroethane, trichloroethylene, and three chlorine.In the amateur conditions, generally can not be cleaned, such as obvious pollution, alcohol can be cleaned, the area can be used cotton swab dipped in alcohol several times; when the area is large, you can use a brush dipped in alcohol scrub. Note that the alcohol should be clean every time.
Rosin is used as flux because rosin contains organic acids such as rosin and acid, but rosin melts and floats on the surface of the metal and does not cause insulation.Rosin flux removing the oxide layer, which is the first reaction of rosin, the main ingredients of rosin acid (Abietic Acid) and heterogeneous diterpene acid (Isomeric diterpene acids), when the heating flux after reaction with copper oxide, copper abiet (Copper abiet), is a green transparent material, easy to dissolve the unreacted rosin. Together with rosin is removed, even if there is residual, no corrosion of metal surfaces.In addition to removing the oxide, the rosin also prevents metal oxidation. After melting, the utility model floats on the surface of the solder to form an isolation layer, thereby preventing the oxidation of the welding surface, reducing the surface tension and increasing the fluidity of the solder.
