Copper belongs to the transition metal with an atomic number of 29, a density of 8.92 g/cm3 and a melting point of 1083.4. It has good thermal and electrical conductivity, so it is widely used as a conductor. However, in humid air, the surface of copper chemically reacts with oxygen to form Cu 2 (OH) 2CO3, ie, copper green. Usually, the copper oxidation in cable factory is black on the surface, which is the surface oxidation phenomenon of copper conductor that troubles many cable enterprises and users. However, in addition to the production process, there are various factors leading to the black wire and cable in the use process, but consumers can not think of the reason behind, next, xiaobian will share some of the most easily ignored wire and cable oxidation reasons ~
1
Improper handling of the cable connector
The cable joint seal is not packaged and the air enters the copper conductor to turn black, and most of the packaging of the cable head will directly seal the insulation tape directly. In fact, the insulation tape is not waterproof and there is a layer of glue above, which will make the cable black.
2
Insulation damp
This situation is also very common, generally occurs in the directly buried or drainage pipe in the cable joint. If the cable joint is not qualified and made in wet climate conditions, the joint will be fed with water or mixed with water vapor, and the cable will be black after a long time. This phenomenon is more common in the hot summer months, when the humidity in the air is relatively high, and the temperature accelerates the oxidation of copper conductors.
3
Construction installation
Some users do not install cables, which can easily cause mechanical damage; civil construction on directly buried cables is also easy to damage the cables in operation. If the cable copper conductor local damage place in the underground moisture or exposed surface will produce oxidation black.
360：Copper is a transition metal with atomic number 29, density 8.92 g/cm3 and melting point 1083.4. It has good thermal and electrical conductivity, so it is widely used as a conductor. In moist air, however, the surface of copper reacts with oxygen to form CU2(OH)2CO3, or patina. Usually the copper oxide of cable factory is black on the surface, which is the copper conductor surface oxidation phenomenon that perplexes many cable enterprises and users. However, in addition to the production process, there are various factors that cause cables and wires to turn black during use, but consumers can not think of the reason behind it. Next, some of the most overlooked causes of wire and cable oxidation ~ 1 improper handling of cable joints, cable joints are not properly sealed and lead to air intrusion copper conductor blackening, most of the cable head packaging master will use insulation tape directly sealed, in fact, insulation tape is not waterproof and there is a layer of glue above, a long time will make the cable black. 2 insulation wet, this situation is also very common, usually occurs in directly buried or in the drain cable joints. If the cable joint made unqualified and do joint in humid climate conditions, will make the joint into water or mixed with water vapor, time for a long time the cable will be black. This phenomenon is more common in the hot summer, because the summer air humidity is greater, and temperature will accelerate the copper conductor oxidation reaction. 3 construction installation, some users in the laying of installation cable construction is not standardized, easy to cause mechanical damage;. If the copper conductor of the cable local damage place long-term in the underground damp or bare surface will produce oxidation blackening.
