Abstract
<p indent=0mm>Laser cleaning is a noncontact cleaning method that uses a short-pulse high power density laser to irradiate an object. The pollutants are removed by the complex physical and chemical interactions between the laser and the object to be cleaned. The mechanism of laser cleaning is very complex, including photodegradation, photodetachment, and photovibration, which are closely related to the temperature distribution in the laser-cleaning process. In this study, the finite element simulation model of laser cleaning of TA15 titanium alloy oxide film is established by using Comsol Multiphysics commercial simulation software. The influence of spot shape, laser energy, loading mode, and pulse width on the titanium alloy oxide film temperature field is analyzed. The results showed that the substrate was severely damaged by a millisecond pulse laser. The shorter the pulse width, the smaller the surface thermal diffusion. The square flat-top spot was more evenly heated than the Gaussian spot, and the rectangular pulse was less damaged than the Gaussian spot. The laser-cleaning effect of titanium alloy oxide film was the best when the square flat-top laser was loaded in a rectangular pulse.
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