Effects of Laser Cleaning on Coating Removal and Secondary Coating Adhesion Performance of Aircraft Skin
摘要
Laser cleaning is characterized by high efficiency, environmental friendliness, and effectiveness in removing paint layers from aircraft skin. Process experiments were conducted by varying the energy density, and the removal effects of the paint layer and changes in the substrate surface morphology were analyzed using a super depth of field microscope, scanning electron microscope (SEM), and energy-dispersive spectrometer (EDS). Existing theoretical models were used to calculate the paint layer temperature, and process parameters were verified. An adhesion tester measured the secondary coating adhesion for different surface morphologies, and a contact angle tester measured the static contact angle of the specimen surface to analyze its influence on surface adhesion. The results showed that at an energy density of 2.06 J/cm2 and a scanning speed of 4000 mm/s, the static contact angle of the cleaned specimen surface decreased, resulting in improved secondary coating performance. The adhesion of the paint layer on the specimen surface increased. Furthermore, x-ray photoelectron spectroscopy (XPS) analysis indicated that pollutants on the substrate surface could be removed after laser cleaning. However, when the energy density was too high, the substrate surface experienced significant oxidation.