The influence of laser power on the effect of different paint layers on the surface of 2024 aluminum alloy with nanosecond pulse laser

Compared with traditional cleaning, laser cleaning has many advantages such as green, environmental protection and easy control, and it has a wide range of application prospects. In this work, the cleaning of single paint layer and composite paint layer on the surface of 2024 aluminum alloy was experimentally studied under different powers. By observing the surface morphology of aluminum alloy after paint removal, the cleaning thresholds of different paint layers are obtained, and the ideal cleaning thresholds of different paint layers under laser cleaning are compared. The results show that when the laser frequency is 120kHz, the pulse width is 200ns, the scanning speed is 4.5mm/s, and the laser power is 45W, the ideal cleaning threshold for the single paint layer is achieved. When the laser frequency is 120kHz, the pulse width is 200ns, the scanning speed is 4.5mm/s, and the laser power is 38W, the ideal cleaning threshold of the composite paint layer is achieved, and compared with the cleaning threshold of different paint layers, the cleaning threshold of the composite paint layer with thicker paint thickness is significantly lower than that of the single paint layer with thinner paint layer, and the reasons for this phenomenon are analyzed.