Abstract
In this work, the laser cleaning process of the surface coating for the Ti-6Al-4V titanium alloy was investigated using a pulsed laser, including cleaning time, laser power, and scanning speed. Meanwhile, the corresponding mechanism of laser cleaning was analyzed using the surface morphology, element content change, coating fracture cross section, and phase change. Results demonstrated that the quality of the coating removed by laser cleaning increased first and then decreased with the increase in the three key process parameters of laser cleaning time, laser power, and scanning speed, respectively. The superior laser cleaning efficiency was achieved when the laser power was 15 W, the cleaning time was 8, and the scanning speed was 400 mm/s. It is concluded that the removal of the titanium alloy surface coating is the result of the coupling of the cleaning mechanisms such as ablation and thermal expansion.
Highlights
Delamination, cracking, and other damages will occur for the surface coatings of the equipment in the industrial manufacturing field to be employed for a long time
The results showed that by reasonably controlling the process parameters of the nanosecond pulsed laser (NPL), the best cleaning quality was obtained without damaging the substrate
The effect of cleaning times, laser power, and scanning speed on cleaning quality was studied in detail
Summary
Delamination, cracking, and other damages will occur for the surface coatings of the equipment in the industrial manufacturing field to be employed for a long time. Jia et al. obtained the process parameters of removing the coatings on the surface of resin-based composites through a method of calculation and experiment for infrared pulsed lasers, through which the substrate was not damaged. The results indicated that the oxide film on the surface of the 5083 aluminum alloy could be completely peeled off with the following combination of laser cleaning parameters: a power of 42 W, a frequency of 250 kHz, a scanning speed of 4725 mm/s, and a pulse width of 100 ns. In response to the important requirements for cleaning the surface protective coatings of aircraft engines, this study employed NPL to conduct laser cleaning on Ti-6Al-4V surface resinbased coatings and explored the effects of cleaning times, laser power, and scanning speed on coating removal. The surface element compositions and phase change of the surface coatings were characterized using SEM and XRD, respectively, and the mechanism of cleaning the coatings using laser was discussed in detail
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