Which type of filler metal is best avoided when brazing in environments prone to corrosion?

Cadmium-containing filler metals are best avoided in environments prone to corrosion because cadmium itself has toxic properties and can contribute to corrosion in certain conditions. When exposed to moisture or corrosive chemicals, cadmium may lead to degradation of the joint and potentially harmful effects on the surrounding materials.

Conversely, BCuP filler metals, which contain copper and phosphorus, are generally more resistant to corrosion and suitable for various applications, including those where corrosion is a concern. Silver filler metals also offer excellent corrosion resistance and are commonly used for brazing, providing strong and durable joints. Aluminum filler metals are often used for brazing aluminum components and tend to perform well in terms of corrosion resistance.

In environments where corrosion is likely, choosing non-cadmium filler options is advisable, as they offer better long-term performance and safety for the joint integrity.