Chromium plating is a commonly used metal surface treatment method. In the electronics industry, certain specific circuit boards require chromium plating to enhance their conductivity, wear resistance, corrosion resistance, and aesthetic appeal. Here are some circuit boards that require chromium plating:

Electronic Components and Circuit Boards: Chromium plating offers excellent conductivity and corrosion resistance, making it suitable for manufacturing electronic components and circuit boards. For instance, it can be used for surface treatment of electronic components such as connectors, sockets, relays, coil frames, and for outer layer plating of printed circuit boards (PCBs).

Automotive Parts: Chromium plating, due to its high hardness and corrosion resistance, is used in the manufacturing of automotive parts like valves, piston rings, exhaust pipes, among others. This plating enhances their wear resistance and overall lifespan.

Mechanical Parts: Chromium plating, known for its exceptional wear and corrosion resistance, finds applications in manufacturing mechanical parts like bearings, gears, pistons, etc. This treatment significantly improves the surface hardness and abrasion resistance of these parts, thereby prolonging their lifespan.

Optical Instruments and Jewelry: Chromium plating with its high reflectivity and aesthetic appearance is used in manufacturing optical instruments and jewelry. For instance, it can be applied to the optical surfaces of photographic lenses and microscopes to enhance their reflectivity and imaging quality. In jewelry, chromium plating improves aesthetics and corrosion resistance.

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It's important to note that chromium plating isn't a mandatory step for all circuit boards; it's chosen based on specific application scenarios and needs. Additionally, the thickness and hardness of chromium layers may vary based on materials, processes, and purposes. Therefore, when selecting circuit boards, considering various factors such as materials, processes, and applications is crucial to ensure the product meets required quality and performance standards.