Dezincification
Dezincification is a form of corrosion in brass where zinc is leached out, leaving behind spongy copper. This weakens the strength and leads to leaks.
Physical-Chemical Mechanism of Action
In dezincification, the less noble metal zinc reacts with oxygen or other corrosive substances in the environment. This dissolves the zinc out and leaves copper behind, resulting in a spongy, fine copper structure.
Metallurgical Relevance & Risks in Welding
Dezincification can occur during welding if the environment is corrosive or if the brass is in contact with oxygen. This significantly weakens the component's strength and leads to leaks and cracks. The biggest risk is the reduction of toughness and mechanical properties of the material.
Workshop Practice & Instructions
To avoid dezincification, brass alloys should be stored in a corrosion-free environment before welding. Use a suitable protective coating or corrosion Corrosion Inhibitor. Ensure proper cooling and removal of residual products after welding.