Key Points For Laser Cleaning of Oil Stains on Stainless Steel Surfaces
By selecting the right equipment, adjusting the appropriate parameters, and following a reasonable process, oil stains on stainless steel surfaces can be perfectly removed without damaging the substrate. The equipment must be a pulsed fiber laser cleaning machine, and the laser spot must be a flat-top beam. Higher power results in higher cleaning efficiency. Generally, the laser power required for cleaning oil stains is very low; a 200-watt pulsed laser cleaning machine is sufficient.
Laser Rust Removal Principle
Understanding the principle of laser cleaning is key to choosing the right equipment and adjusting parameters. Oil, as a non-metallic contaminant, has a relatively low absorption rate to pulsed fiber lasers. However, pulsed lasers, in addition to thermal effects, also have optical vibration effects. Simply put, beams of laser light strike the metal surface, generating high-frequency vibrations. Under the combined effect of optical vibration and thermal expansion, oil contamination on stainless steel surfaces is effectively removed.
Parameter Adjustment
Parameter adjustment of laser cleaning equipment is also crucial. Pulsed laser cleaning equipment allows for the adjustment of many parameters, including laser power, spot shape, pulse width, laser frequency, scanning speed, and overlap rate. Although there are many parameters, changes to all of them ultimately affect one value—laser energy density. This parameter is the most important value in laser cleaning; it is the combined effect of various parameters. Laser energy density = laser energy / area. Changes in all parameters ultimately affect the magnitude of the laser energy density, which determines the effectiveness of laser cleaning. Only at a suitable laser energy density can contaminants be removed effectively without damaging the substrate. Too low a laser energy density will fail to remove oil stains, while too high a density will damage the substrate. To achieve the desired effect of removing oil stains without damaging the stainless steel substrate, precise adjustment of the laser energy density is crucial. Generally, the energy density should be gradually increased from a low level until a suitable parameter is found. For a specific cleaning material, the appropriate laser energy density value is almost constant.
Operating Points and Precautions
Pre-treatment: Before laser cleaning, the stainless steel surface should be preliminarily inspected to remove large foreign objects and heavy dirt, reducing the burden on the laser cleaning process and improving cleaning efficiency.
Safety Protection: During laser cleaning, professional protective glasses and clothing should be worn to avoid direct laser exposure to the eyes and skin. Ensure good ventilation in the work area to prevent the accumulation of harmful gases.
Real-time Monitoring: During the cleaning process, the cleaning effect should be monitored in real time, and laser parameters should be adjusted based on feedback to ensure cleaning quality. Simultaneously, observe changes in the stainless steel substrate to prevent damage caused by improper parameter settings.
Post-treatment: After cleaning, necessary post-treatments, such as drying and rust prevention, should be performed on the stainless steel surface to extend its service life and maintain good appearance quality.
Laser cleaning technology is a highly efficient and environmentally friendly method for cleaning oil stains on stainless steel surfaces. By selecting appropriate equipment, accurately setting parameters, and following the correct operating procedures, efficient and non-destructive cleaning of oil stains on stainless steel surfaces can be achieved.