What is the difference between nickel-plated and tin-plated copper? Why is nickel-plated copper more suitable for large current applications?

In high-current and high-voltage applications, copper strips serve as critical electrical connection components, with their surface treatment having a profound impact on product performance. Traditionally, tin-coated copper strips have been widely used due to their low cost and superior welding performance. However, as the demand for high current and high-power applications increases, defects in tin coating gradually become apparent. As a professional PCB current-carrying copper strip manufacturer, Bozhong New Material recommends nickel-coated copper strips. The following is an analysis of the advantages and disadvantages of nickel coating and tin coating.

**Advantages of Nickel-Coated Copper Strips**

1. **Excellent Corrosion Resistance**

The nickel layer on the surface of nickel-coated copper strips provides strong anti-corrosion capability, effectively preventing oxidation. This is particularly beneficial in high-humidity and salt-fume environments. In contrast, tin-coated copper strips are prone to oxidation on their surface, especially after prolonged exposure, which can affect their electrical performance. This leads to increased contact resistance, resulting in poor contact and affecting overall electrical performance.

2. **Improved Mechanical Strength and Wear Resistance**

Nickel-coated copper strips possess high hardness and wear resistance, making them ideal for applications requiring frequent