Cadmium Alloys

Cadmium alloys are typically formed by combining cadmium (Cd) with various base metals to modify physical or chemical properties like corrosion resistance, strength, or fusibility. Common Cadmium Alloys: 1. Cadmium-Copper (Cd-Cu) - Cadmium: 0.5–1% - Copper: Balance - Improves conductivity and wear resistance 2. Cadmium-Zinc (Cd-Zn) - Cadmium: Varies (10–30%) - Zinc: Balance - Used in low-melting-point soldering applications 3. Cadmium-Nickel (Cd-Ni) - Used in rechargeable batteries (e.g., Ni-Cd batteries) 4. Cadmium-Silver (Cd-Ag) - Silver: 90–95% - Cadmium: 5–10% - Used in electrical contacts due to excellent conductivity and arc resistance

Electrical Contacts Cd-Ag alloy resists arcing and wear, ideal for switches and relays. Batteries Cadmium-nickel alloys are core materials in Ni-Cd rechargeable batteries. Solder & Brazing Alloys Cd-Zn and Cd-containing solders melt at low temperatures, ideal for electronics and glass-to-metal seals. Coatings and Plating Some Cd alloys are used for corrosion-resistant plating in aerospace and marine parts. Bearings and Bushings Cd-Cu improves fatigue resistance and wear properties in rotating equipment.

Excellent Electrical Conductivity: Particularly in Cd-Ag and Cd-Cu alloys. Low Melting Points: Ideal for precision soldering and bonding. Great Arc Resistance: Used in high-performance switchgear. Stable Battery Chemistry: Still used in Ni-Cd battery systems. Improved Wear Resistance: Enhances performance in mechanical systems like bushings.

1. Why is cadmium used in electrical contacts? Cadmium-silver alloys provide excellent arc resistance and durability, making them ideal for high-reliability switching components. 2. What are the benefits of cadmium in copper alloys? Adding small amounts of cadmium to copper increases wear resistance and hardness without significantly reducing electrical conductivity. 3. Is cadmium used in battery applications? Yes. Cadmium-nickel (Ni-Cd) batteries are known for their long cycle life, reliability, and performance in extreme temperatures. 4. How does cadmium affect soldering performance? Cadmium alloys lower the melting point of solders, making them suitable for precision electronics and glass-to-metal sealing. 5. What makes cadmium-zinc alloys unique? They offer low melting points and good fluidity, making them suitable for die casting, soldering, and specific precision applications.