Fig. 1. Cleaning decontrol workstation

Fig. 2. Corroded sample

Fig. 3. Laser waveform

Fig. 4. Macroscopic morphology of the sample after decontamination

Fig. 5. Surface micro-morphology of the sample before and after decontamination. (a) Substrate; (b) Dry ice decontamination; (c) Laser decontamination; (d) Laser composite decontamination

Fig. 6. Surface composition distribution of the sample before and after decontamination. (a) Substrate; (b) Dry ice decontamination; (c) Laser decontamination; (d) Laser composite decontamination

Fig. 7. Cross-section metallographic structure of the sample before and after decontamination. (a) Substrate; (b) Dry ice decontamination; (c) Laser decontamination; (d) Laser composite decontamination

Fig. 8. Cross-section composition distribution of the sample before and after decontamination. (a) Substrate; (b) Dry ice decontamination; (c) Laser decontamination; (d) Laser composite decontamination

Fig. 9. 3D surface morphology and contour curve of the sample before and after decontamination. (a) Substrate; (b) Dry ice decontamination; (c) Laser decontamination; (d) Laser composite decontamination

Fig. 10. Surface roughness of the sample before and after decontamination

Fig. 11. Hardness measurement point setting diagram

Fig. 12. Microhardness of the near surface layer of sample

Fig. 13. Hardness distribution in the depth direction of the sample

Fig. 14. Schematic diagram of dry ice decontamination

Fig. 15. Schematic diagram of laser decontamination

Fig. 16. Schematic diagram of laser composite decontamination

Fig. 17. Clean decontrol motor impeller