Sacrificial Layer

Physical-Chemical Mechanism of Action

The sacrificial layer forms through an electrochemical reaction where the coated material (anode) can corrode instead of the underlying material (cathode). This prevents corrosion of the core material.

Metallurgical Relevance & Risks in Welding

When welding, the sacrificial layer can be damaged, reducing its protective function. There’s also a risk that the underlying material can corrode if the protective layer isn’t complete or strong enough.

Shop Practice & Instructions

Before welding a coated material, check the coating layer. If needed, apply an additional coating. Pay attention to proper welding technique and parameters to keep the sacrificial layer intact.