Oxide layer
Oxide layers are reaction layers on metal surfaces that are formed by the action of oxygen during thermal processing.
They influence surface quality as well as subsequent coating and processing processes.
Formation of oxide layers
Oxide layers form when metal surfaces react with oxygen during thermal processes. Layer formation depends on factors such as temperature, process duration, material, and the cutting gas used.
Factors influencing oxide formation
- thermal stress
- Oxygen input
- Material composition
- Cutting process
- process parameters
Impact on subsequent processes
Remaining oxide layers affect surface quality and can complicate stable subsequent processes. Coating, bonding, and welding processes, in particular, are sensitive to oxide residues.
Possible effects
- reduced coating adhesion
- unequal surface conditions
- unstable subsequent processes
- increased post-processing effort
- Impairment of surface appearance
Oxide removal as a process step
In the oxide removal process step, oxide residues are mechanically removed to create metallically clean surfaces and reproducible starting conditions for subsequent processes.
The goal is a uniform surface quality to ensure stable coating and further processing.
Oxide layers in thermal cutting processes
The formation of oxide layers varies depending on the cutting method used. Oxygen cutting processes, in particular, often result in thicker oxide reaction layers at the cut edge.
Typical differences
- Oxygen cut: more frequent, stronger oxide layer formation
- Laser cutting: Different oxide formation occurs depending on the cutting gas.
- Nitrogen cut: Reduced oxide formation at the cut edge
FAQ
Why do oxide layers need to be removed?
Oxide layers can negatively affect the coating capability, adhesion and process stability of subsequent processing steps.
How do oxide layers form?
Oxide layers are formed by the reaction of metal surfaces with oxygen during thermal processing.