Each laser pulse removes a certain thickness of contamination layer. If the contamination layer is thick, multiple pulses need to be cleaned. The physical principle of laser rust removal depends on the degree of surface contamination.
The physical principle of laser rust removal is summarized as follows:
1. The laser beam is absorbed by the contamination layer on the material surface.
2. Large energy absorption forms a rapidly expanding plasma (highly ionized unstable gas), which generates shock waves.
3. Shock waves break contaminants into pieces and remove them.
4. The light pulse width must be short enough to avoid heat accumulation that may damage the treated surface.
5. The experimental results show that when there are oxides on the metal surface, the plasma occurs on the metal surface; The laser cleaning machine is mainly based on the fact that the pollutants on the object surface absorb the laser energy, or vaporize and volatilize, or expand instantaneously under heat to overcome the adsorption force of the surface to particles, so that it can be separated from the object surface, and then achieve the purpose of cleaning.
The above is the physical principle of laser rust removal. The laser beam irradiates the surface of the oxide coated material through laser vibration, high temperature expansion and peeling. This is laser derusting, simple, fast, practical and efficient. The whole laser cleaning process is completed without damaging the substrate. The cleaning of material surface is a technology to realize the cleaning of workpiece surface.
