Tinder
Scale refers to oxide layers on metal surfaces that are formed by thermal action during cutting, heating or forming processes.
The oxide layer affects subsequent processing and coating processes.
Formation of tinder
Scale forms when metal surfaces react with oxygen at high temperatures. This process creates oxide layers of varying thickness and adhesion on the surface or cut edges of sheet metal components.
Factors influencing scale formation
- Temperature load
- Oxygen input
- Material composition
- Separation process
- Process duration
Impact on subsequent processes
Remaining scale affects surface quality and can complicate stable subsequent processes. In particular, coating, welding, and bonding processes are sensitive to oxide residues on the component surface.
Typical effects
- reduced coating adhesion
- unequal surface conditions
- unstable subsequent processes
- increased post-processing effort
- Impairment of surface appearance
Scale in connection with oxide removal
In the oxide removal process step, oxide layers are mechanically removed to create metallically clean surfaces and reproducible starting conditions for subsequent processes.
Difference between scale and slag
Slag describes molten and resolidified material deposits at the cut edge. Scale, on the other hand, forms as an oxide reaction layer on the surface of the material.
Technical differences
- Slag: molten and solidified material
- Tinder: oxide surface layer
- Slag: predominantly at cut edges
- Tinder: flat on metal surfaces
FAQ
Why does scale need to be removed?
Remaining scale can impair the adhesion of coatings and lead to unstable subsequent processes.
In which processes is scale formed?
Scale is primarily formed during thermal machining processes involving high temperature stress and contact with oxygen.