Fig. 1. Structural diagram of laser cleaning equipment

Fig. 2. Morphology and composition analysis of rusting layer. (a) Macro morphology; (b) SEM image; (c) X-ray diffraction peak

Fig. 3. Diagram of light spot lapping

Fig. 4. High-speed photography photos at different time under both of two laser cleaning methods. (a)-(c) Dry laser cleaning; (d)-(f) liquid film-assisted laser cleaning

Fig. 5. Surface morphologies of laser derusting samples at different process parameters. (a)(d) 100 W; (b)(e) 300 W; (c)(f) 400 W

Fig. 6. Surface SEM morphologies of dry laser cleaning samples under different powers. (a) 100 W; (b) 300 W; (c) 400 W

Fig. 7. Surface SEM morphologies of liquid film-assisted laser cleaning samples under different powers. (a) 100 W; (b) 300 W; (c) 400 W

Fig. 8. Surface roughness of sample before and after different laser cleaning methods

Fig. 9. Oxygen content of sample surface after laser cleaning

Fig. 10. X-ray diffraction peak contrast of rusting layer and laser derusting sample