Copper ions are the main cause of pitting corrosion in aluminum

In the wire and cable industry, cable products are used in other fields such as communication, signal, power, etc., or in other special fields. As long as there are shielding requirements, metal shielding tape is an essential structural material. The traditional technical requirements and the metal shielding tape currently used in the mainstream are pure copper tape.

Copper is a scarce resource. As copper prices continue to rise in recent years, the proportion of metal shielded copper strips in unit length cables continues to increase.

In order to reduce costs, cable manufacturers usually use control thickness and width to lower the line and even reduce the thickness and width. If a wrapping process is used, a method of increasing the pitch size on the line and reducing the overlap is also used. However, these measures quickly brought the risk of structural quality, and the quality problems that came out were everywhere.

In order to ensure the size of the metal shielding tape structure, and to achieve a breakthrough in cost reduction, the research on the bimetal composite material by reducing the unit size density is also involved in the field of metal shielding tape, copper-coated iron-based, copper-clad aluminum-based shielding. Strip samples began to appear.

It is well known that the three main indicators of electrical conductivity, tensile strength and elongation of metal shielding tape play a major role in the performance and structural quality of the shielding layer in the cable. After the cable is laid, the environmental corrosion resistance is also a great test for the quality and life of the metal shielding tape. Copper-coated iron-based materials have poor electrical conductivity, elongation, and environmental corrosion resistance; copper-clad aluminum-based materials have low tensile strength and environmental corrosion resistance, especially copper ions are the main cause of pitting corrosion in aluminum. one. These imperfect indicators make it impossible to make trade-offs between quality and cost.

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