离焦状态对激光清洗CFRP表面涂层的影响及清洗机制OA

Carbon fiber-reinforced polymer(CFRP)composites are usually covered with paint in practical applications.To achieve the nondestructive removal of the surface paint on CFRP and improve the recycling rate of CFRP,we investigated the cleaning effect and mechanism of infrared high-repetition-rate pulsed lasers on the surface paint of CFRP under different defocus distances.First,when the defocus distance was 40 mm,the surface paint of CFRP was cleaned by adjusting the power and scanning speed,and the cleaning effect was observed to obtain relatively optimized process parameters.On this basis,the paint was treated by varying the defocus distance.Finally,the cleaned samples were characterized and analyzed in terms of sur-face morphology,elemental composition and contact angle,so as to obtain the cleaning effect,the contact angle variation law and the cleaning process under different defocus distances.The results show that with an increase in the defocus distance,the cleaning process transforms from vaporization to a heat accumulation ef-fect,and proper heat accumulation contributes to the complete removal of paint and resin.When the power,scanning speed and defocus distance are 25 W,720 mm/s and 40 mm respectively,the paint can be com-pletely removed without damaging the carbon fibers,while effectively improving the surface wettability of the substrate.