Fig. 1. (a) Corrosion sample；(b) Micro diagram of sample corrosion thickness

Fig. 2. Schematic diagram of laser derusting experimental platform

Fig. 3. (a) Macroscopic morphology of the substrate surface after laser irradiation with 30% average power percentage；(b) Macroscopic morphology of the substrate surface after laser irradiation with 90% average power percentage

Fig. 4. Macroscopic morphology of substrate surface after laser derusting with different average power percentages

Fig. 5. Micromorphology of substrate surface after laser derusting with different average power percentages

Fig. 6. Changes of surface elements after laser derusting with different average power percentages

Fig. 7. Comparison of surface cleaning quality. (a) GB/T 8923.1—2011 Sa2.5 surface cleanliness; (b) Surface quality of materials after laser derusting

Fig. 8. 3-D morphology and surface roughness of substrate surface with different rust removal methods. (a) Pre-cleaning sample (5.18 μm); (b) Mechanical grinding sample (16.78 μm); (c) Laser derusting sample (5.5 μm)

Fig. 9. Comparison of hardness test results

Fig. 10. Sectional microstructure near the cleaning layer of typical laser derusting sample. (a) Substrate center; (b) Cleaning area near the layer with 60% laser power percentage; (c) Cleaning area near the layer with 70% laser power percentage