The Influence Of Plating Process On The Contact Performance Of Bimetallic Terminals
In connector manufacturing, the contact interface design of the bimetal cable lug pin directly affects signal transmission stability and product lifespan. The industry typically uses electroplating to create a functional surface layer in the contact area of bimetal terminal lug to adapt to different application environment requirements.
Mechanism of Nickel Underlayer Plating
A nickel plating layer is often deposited as the underlayer on a copper alloy substrate. This dense nickel layer acts as multiple physical barriers. The nickel underlayer prevents the diffusion and migration of copper substrate elements to the surface noble metal, avoiding oxidation and enrichment of substrate elements at the contact surface. The nickel plating significantly improves the overall mechanical strength of bimetallic lugs price. It also provides a smooth and well-bonded deposition substrate for the top metal layer.
Key points for process control of nickel underlayer
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Thickness uniformity: In continuous electroplating processes, the thickness distribution of the nickel layer must be precisely controlled to ensure that it does not crack at the bending points of the bimetallic lugs price list terminals.
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Surface Activation: Post-nickel plating rinsing and activation treatment are crucial; residues can affect the adhesion of subsequent plating layers.
Functional Selection of Surface Plating
On top of the nickel base layer, different surface platings are selected based on the application scenario of the cable lug bimetal terminal. For applications requiring extremely low contact resistance and high insertion/removal cycles, hard gold plating is often chosen, as the cobalt element in the gold plating increases surface hardness. For connections with high solderability requirements, tin or tin-lead alloy plating provides excellent solderability. Silver plating is commonly used in high-current transmission scenarios. These surface platings directly participate in contact mating, and their crystal morphology and purity directly determine the long-term stability of contact resistance.
