Analysis Of Wire Drawing And Nickel Plating Technology in The Surface Treatment Process Of Bare Copper Busbars

In the production and manufacturing process of bare copper busbars throughout their life cycle, the surface treatment process is like a key link that gives the product a "second life". Among them, the surface wire drawing process and nickel plating technology are the two core treatment methods. From the microscopic to the macroscopic level, they shape the performance and service life of the Electrical Bus Bar in all aspects. Their importance is self-evident.

 

 

The surface wire drawing process is essentially a surface modification technology based on the principle of mechanical processing. Its core lies in constructing a regular microstructure on the surface of the Ground Bus Bar through specific physical effects. Specifically, the wire drawing equipment commonly used in production practice is mainly divided into roller wire drawing machines and sand belt wire drawing machines. The roller wire drawing machine uses carbide rollers with different patterns to generate relative motion with the copper busbar surface under the drive of the motor, and "replicates" the patterns on the roller surface to the copper busbar surface through pressure; the belt wire drawing machine relies on a high-speed running sand belt to cut the BusBar Electrical surface by the grinding effect of sand particles.

 

In actual operation, the operator needs to accurately adjust the various parameters of the wire drawing equipment according to the specifications, materials, and final application requirements of the BusBar for ABB. For example, for thinner copper busbars, a lower wire drawing speed (about 5-10m/min) and a smaller pressure (0.1-0.3MPa) are required to prevent the Electrical Copper BusBar from deforming; for thicker copper busbars, the speed and pressure can be appropriately increased, and the ideal surface effect can be gradually achieved through multiple wire drawing.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The advantages of this process present multi-dimensional characteristics:

1. Aesthetic value enhancement: After wire drawing, the parallel or cross patterns formed on the surface of the Copper Solid Bus Bar break the monotonous mirror effect of the original copper material, giving the product a unique industrial aesthetic. This textured surface not only improves the overall visual grade in distribution cabinets, switch cabinets, and other equipment but also makes it easier for installers to quickly identify busbars with different functions.

2. Optimized conductivity: The removal of surface oxide film and impurities significantly improves the atomic-level flatness of the copper busbar surface. Studies have shown that the surface roughness Ra value of the Power BusBar after fine wire drawing can be reduced from the original 3-5μm to 0.5-1μm, which makes the contact with the electrical connector closer and reduces the contact resistance by about 8%-12%. In high-power transmission scenarios, it can effectively reduce power loss and heat generation.

3. Strengthening surface protection: The microscopic texture formed by wire drawing increases the surface area to a certain extent. When subsequent protective treatments such as nickel plating are performed, the larger contact area can provide more binding sites, which increases the adhesion between the plating and the Bus Bar Electric by 30%-50%, effectively preventing the plating from peeling off during long-term use.

 

Nickel plating technology is an important means to build a functional metal layer on the surface of the bare copper busbar. Its principle is based on the electrochemical reaction or chemical reduction reaction of metal ions. According to different process principles, it is mainly divided into two methods: electroplating nickel and chemical nickel plating. Electroplating nickel is to make the nickel ions in the plating solution obtain electrons on the surface of the High Voltage BusBar under the action of the DC electric field, and deposit to form a metal nickel layer; chemical nickel plating is to uses a reducing agent (such as sodium hypophosphite) to reduce and deposit nickel ions on the surface of the copper busbar with catalytic activity without an external power supply. The two processes have their own characteristics.

 

Electroplating nickel has the advantages of fast deposition speed and strong controllability of the coating thickness, which is suitable for mass production; chemical nickel plating can form a uniform coating on the surface of complex shapes, especially suitable for the treatment of blind holes, deep grooves, and other parts.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The key role of nickel plating technology is reflected in many aspects:
1. Corrosion resistance leaps: Nickel can quickly form a dense oxide film (NiO) in the air. This oxide film is only a few nanometers thick, but has extremely high chemical stability and can effectively block oxygen, moisture, and corrosive gases from contacting the copper busbar. In an industrial atmosphere, bare copper busbars without nickel plating may show obvious rust within a few months, while busbars after nickel plating can maintain no obvious signs of corrosion on the surface for 3-5 years. In high salt fog environments such as coastal areas, the protective effect of the nickel plating layer is more prominent, which can extend the service life of the busbar to 8-10 years.

2. Synergistic enhancement of electrical and thermal conductivity: Although the electrical conductivity of nickel is slightly lower than that of copper, it remains at a high level (about 27% of copper), and its thermal conductivity is good. The metallurgical bond formed between the nickel-plating layer and the Nickel-Plated Bus Bar ensures that current and heat can be efficiently transmitted between the two metal interfaces. In high-frequency circuits, the nickel plating layer can effectively reduce the impact of the skin effect and improve the stability of signal transmission; in equipment with high heat dissipation requirements, the good thermal conductivity between the nickel plating layer and the heat sink helps to quickly dissipate the heat generated by the busbar during operation.

3. Significant improvement in welding performance: The copper oxide layer formed by the easy oxidation of the Nickel nickel-plated copper busbar surface in the air will seriously affect the welding quality, while the nickel plating layer can effectively isolate oxygen and keep the welding area clean. At the same time, nickel has good wettability with solder (such as tin-lead alloy, lead-free solder), which can reduce the welding temperature, reduce the welding time, make the solder joints fuller and firmer, and effectively reduce the incidence of welding defects such as cold soldering and desoldering.

 

In actual industrial production, the surface wire drawing process and nickel plating technology usually form a close synergistic relationship. First, the bare copper busbar is pretreated through the wire drawing process to remove surface impurities and form a suitable microscopic rough structure; then nickel plating is performed so that nickel ions can be filled into the lines formed by wire drawing to form a "mosaic" plating structure, which not only enhances the adhesion of the plating but also further improves the overall protection and electrical performance. With the continuous emergence of new materials and new technologies, the surface wire drawing process and nickel plating technology will develop in a more intelligent, green, and refined direction in the future, and continue to provide a strong impetus for the technical upgrading and product iteration of the bare copper busbar industry.