Solving Electrochemical Corrosion: Why Bimetallic Terminals Can Reliably Connect Aluminum Conductors To Copper Busbars

In electrical engineering construction sites, it's common to encounter scenarios where aluminum core cables need to be connected to copper busbars. Simply stuffing the aluminum wire directly into the copper connector will inevitably cause major problems later.

The "Hidden Bomb" of Direct Aluminum-Copper Contact

Many people wonder why these two metals can't directly "shake hands." The answer lies in a physicochemical reaction. Aluminum and copper have a very large potential difference. If there's even a little moisture in the air, the contact surface becomes a miniature battery, causing electrochemical corrosion. This reaction produces a high-resistivity oxide layer, leading to overheating at the connection point and even burning out the equipment.

The original design concept of bimetallic lugs price was to act as a "coordinator". It uses friction welding to fuse copper and aluminum together at the atomic level, preventing any potential chemical reaction at the connection point.

Unveiling the secrets: The logic behind bimetallic lugs price list's reliable connection of aluminum conductors to copper busbars

This accessory is ingeniously constructed, typically consisting of an aluminum tube at one end to encase the aluminum cable and a copper plate at the other end to lock onto the copper busbar.

• Interface Fusion Process: During manufacturing, the high temperatures generated by mechanical friction create a strong bonding layer between the copper and aluminum materials at the interface. This bonding method offers high mechanical strength, stable electrical performance, and the ability to withstand long-term thermal cycling.

• Compatibility of Expansion Coefficients: Aluminum has a significantly higher coefficient of linear expansion than copper. Direct connection would lead to a loosening of the connection due to the different expansion rates during power-on heating. This terminal design uses a material transition to mitigate the mechanical stress caused by thermal expansion and contraction.

• Oxidation Resistance: The aluminum terminals are typically pre-filled with conductive paste. This protective film blocks oxygen, maintaining a long-term low impedance in the electrical circuit.

When using cable lug bimetal, construction workers only need to follow the standard crimping procedure to obtain a stable power transmission effect. This solution is simpler and more intuitive than earlier coating layers or transition plates.