Comparative study of paint removal processes for aluminum alloy skin surface
In order to compare the effects of different processes to remove the paint film on the surface of aluminum alloy skin and the effects on the substrate material,the paint layer on the surface of alumi-num alloy skin was removed by mechanical sanding,sandblasting and laser paint removal methods,re-spectively.Scanning electron microscope,laser confocal microscope and Raman spectrometer were used to characterize the paint removal effect.The results show that the SiC abrasive particles used in me-chanical sanding not only embedded in the paint removal surface,but also damaged the chemical struc-ture of the paint layer polymer,resulting in a significant increase in the content of Si,N-H,and-CH,which could not avoid the substrate damage.After the sandblasting pressure of sandblast paint removal method was increased from 0.1 MPa to 0.3 MPa and 0.5 MPa,the diameter of the impact crater on the sur-face of the paint removal increased and the surface roughness increased from 7.89 μm to 14.27 μm and 13.29 μm respectively,which resulted in a large error that could not guarantee the process quality of the repainting.The laser paint removal method could finely control the paint removal process,and when the heat input was controlled to be 50.4 J/cm2,the surface paint layer was almost completely removed and there was no obvious damage to the surface of the substrate.This study proves that laser paint remov-al as an emerging paint removal process has the advantages of high efficiency,controllable parameters,real-time monitoring,etc.,and has certain application value and development potential in the industrial field.
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