Causes of Copper Yellowing in Cables

There are usually several reasons for yellowing:

1, the tin furnace temperature is too high, fluidity, resulting in a large coating, copper and tin penetration;

2, tin layer is too thin, copper and tin penetration;

3, flux residue too much halogen, copper surface pickling is not thorough;

4, the packaging time is too fast, the heat is not scattered, too many impurities in the tin furnace;

5, the quality of copper material is off, too many impurities;

6, the level of temperature has an effect on the activity of copper atoms, hot days faster than the cold yellow.

These problems can be solved by the following methods:

1, mold diameter> line by +0.02mm (the purpose is very simple can not be too thin coating);

2, can be placed after production for about 2 hours before packaging (purpose: internal heat dissipation);

3, buy a good flux, with a good flux concentration, mainly the impact of tin flux quality;

4, choose a better oxygen-free copper wire.

In a sense, the wire and cable manufacturing industry is a material finishing and assembly industry. One is that the amount of materials is huge, and the cost of materials in wire and cable products accounts for 80-90% of the total manufacturing cost; the second is that the materials used are of many types and varieties, and the performance requirements are particularly high. For example, copper for conductors requires the purity of copper. Above 99.95%, some products use oxygen-free high-purity copper; Third, the choice of materials will have a decisive influence on the manufacturing process, product performance and service life.