Causes of copper wire blackening
The blackening of the coil copper wire is caused by many factors, and it is also related to many factors such as the state of the copper wire itself, the coil processing technology, the vulcanization process, the structure of the coil, the formula, and the coil production environment.
1. Technical reasons
In the past, most domestic manufacturers used universal copper rods with a copper content of up to 99.95%, but even so, there is still oxygen in the copper. Because copper itself is not oxygen-free copper, during processing, the surface of copper will inevitably be exposed to air and oxidize.
2. The material problem of the insulating layer
Insulating paint can be divided into five categories: impregnating paint, enameled wire paint, covering paint, silicon steel sheet paint, and anti-corona paint. Among them, the impregnating varnish is used to impregnate the coils of motors and electrical appliances. The impregnating varnish can fill the gaps and micropores in the insulation system, and form a continuous paint film on the surface of the impregnated object, so that the coil is bonded into a strong whole, which effectively improves the integrity, thermal conductivity and moisture resistance of the insulation system Performance, dielectric strength and mechanical strength.
3. The problem of use
In the process of using coil copper wire, we often encounter such problems: collision and friction; slow washing and large amounts of water contact with the coil; use of waste engine oil to lubricate, resulting in residues on the surface of the conductor and damage to the insulation layer; in the subsequent processing When the conductor is oxidized;
4. Copper wire annealing process
Copper wire annealing refers to a metal heat treatment method in which the copper wire is slowly heated to a certain high temperature, maintained for a period of time, and then cooled at a corresponding speed.
