Study On Properties Of Composite Coatings On 2A12 Aluminum Alloy Surface Cleaned By Nanosecond Pulsed Laser

In this paper,the theoretical and experimental research of acrylic resin composite coating on the surface of 2A12 aluminum alloy is carried out by nanosecond laser cleaning,and the influence of different laser parameters and galvanometer parameters on the surface roughness and micromorphology of aluminum alloy during nanosecond laser cleaning process is explored,and the temperature change process of coating and aluminum alloy during cleaning process is explored.In terms of theoretical research,based on the adhesion theory of 2A12 aluminum alloy substrate and acrylic resin coating layer and the thermal vibration effect in the process of nanosecond pulsed laser cleaning,the ablative effect model and thermal stress cleaning theoretical model of the 2A12 aluminum alloy surface composite coating process are established,and the relationship between different laser parameters and galvanometer parameters and stress and temperature changes in the laser cleaning process is studied.In terms of simulation research,based on the basis of theoretical research,a simulation model of nanosecond pulsed laser cleaning composite coatings was established,and a simulation research on nanosecond pulsed laser cleaning of aluminum alloy surface composite coatings was carried out.Simulate thermal stress distribution and temperature rise changes between substrate and coating.Through the analysis of the simulation results,the influence of different energy density,lap rate and scanning speed on the temperature field and stress field is obtained.In terms of experimental research,a whole-process experimental test system for cleaning the surface coating of aluminum alloy plate with 1064 nm nanosecond pulsed laser was established.Finally,the temperature change law of the substrate surface coating when it reacts with the laser and the influence of various parameters on improving the cleaning effect without damaging the substrate are obtained.