Passivation Enhancement
Passivation promotion improves corrosion resistance by alloying elements like chromium that create a dense oxide layer.
Physical-Chemical Mechanism of Action
Alloying elements like chromium react with oxygen and form a dense, stabilized oxide layer on the metal surface. This layer prevents further corrosion by isolating the metal from oxygen and water molecules.
Metallurgical Relevance & Welding Risks
Promoting passivation increases the service life and reliability of components in corrosive environments. However, missing or insufficient passivation elements can lead to accelerated corrosion, which can cause cracks and scrap in the weld pool.
Shop Practice & Instructions
Use metals with passivating chromium content in corrosive environments. Make sure that the weld forms a dense oxide layer by maintaining the correct welding temperature and time. After welding, inspect the surface for corrosion damage.