Incubation Period
Incubation time is the time during which corrosion damage starts to form but is not yet visible. In this phase, the passive layer breaks down locally or critical stresses accumulate.
Physicochemical mechanism of action
Incubation time begins when a corrosive environment (e.g., air with moisture) contacts a metallic surface area. Here, the chemical reactions leading to corrosion start, but it takes a long time before macroscopic damage becomes visible.
Metallurgical relevance & risks during welding
During welding, incubation time can be an issue, especially if the passive layer is interrupted. This can lead to local corrosion initiation that becomes visible later and affects the material. It is important to keep the environment dry and clean before welding.
Workshop practice & instructions
To minimize incubation time, thoroughly clean and dry the metal surface before welding. If necessary, use passivation agents to create a dense passive layer. Ensure the environment remains dry during welding to prevent corrosion damage.