How Does Precision Surface Treatment Define The Connection Reliability Of Bimetallic Terminals?
In the connector industry, the quality of the terminal contact surface often determines the long-term performance of the entire electrical system. As a key component connecting the aluminum conductor and the copper busbar, the processing of the contact interface of the bimetallic lugs terminal directly affects the stability and durability of current transmission. To address this technical requirement, the contact surface of bi metal cable lug can be polished to provide ideal substrate conditions for subsequent coatings.
Polishing Process: The Foundation of Contact Performance Pretreatment
From an engineering perspective, the polishing process of bi metal lugs connectors is not merely surface decoration, but a crucial step in systematically improving the contact interface. In continuous electroplating processes, chemical or electrochemical polishing after degreasing and pickling removes microscopic defects and contaminant layers from the substrate surface. This process activates the metal surface, creating uniform and dense deposition conditions for subsequent processes such as nickel or gold plating. The surface roughness of the polished terminal is significantly reduced, and the refined grain structure helps improve plating adhesion and wear resistance.
Contact Interface: From Microscopic Smoothness to Macroscopic Reliability
The polished bi metallic cable lugs terminals exhibit a higher degree of smoothness and cleanliness in their contact surfaces. In subsequent plating processes, whether it's cobalt-containing acid gold plating or nickel sulfamate plating, a uniformly thick and finely grained metal film can be formed on the polished substrate. This structured surface treatment maximizes the actual contact area at the interface, providing a physical basis for reducing contact resistance. The friction welding process integrates the aluminum cylinder and the copper palm rest, while polishing ensures a smooth transition between the welded area and the plating, reducing micro-stress concentration at the interfaces between different metals.
