Selective and noncontaminated surface polishing of titanium alloy implants is crucial in the biomedical field. We employed a pulsed laser as a localized and selective heat source and dilute phosphoric acid as a corrosion solution for laser chemical polishing (LCP) of medical Ti-6Al-4V titanium alloy surface. The effect of laser fluence on the removal groove morphology of titanium alloy surfaces was systematically studied, and the characteristics and mechanisms of material removal were further discussed. The results show that the groove morphology of the workpiece surface at different laser fluences can be classified into three categories, depending on the two-dimensional removal profile. The removal mechanism of LCP is a combination of laser etching and chemical corrosion, and chemical etching can completely remove the residues and melts produced by laser ablation. Finally, selective polishing of medical Ti-6Al-4V titanium alloy was achieved by setting appropriate process parameters. Moreover, the energy-dispersive x-ray spectroscopy analysis showed that there was no detectable chemical impurity contamination on the polished surface.
In order to extend the service life of injection mold, the use of laser rust removal was used to repair the surface quality of mold steel in this paper. The surface corrosion of mold steel was removed by using the laser dry cleaning method, then the surface roughness was restored to the initial state to meet the performance requirements of manufacturing. By analyzing the experimental results, the influence of laser energy density, spot overlap rate and scanning times on improving the surface quality of corroded area was obtained. It was shown that when the laser energy density, spot overlap rate and scanning times is 26 J/cm2, 18% and 3 times respectively, the optimum surface roughness of Sa2.32μm can be obtained, which meets the production requirements. Compared with traditional rust removal methods, the laser rust removal of the mold surfaces deserves more extensive research and application due to its advantages of high efficiency, precision and environmentally friendly.
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