Fig. 1. Micromorphologies of CoCrFeNi powder and CNTs before and after mechanical mixing. (a) CoCrFeNi raw powder; (b) CNT raw powder; (c) CoCrFeNi-CNTs powder; (d) local magnification of Fig. 1 (c)

Fig. 2. Laser cladding diagram for preparing CoCrFeNi-CNTs composite coating and physical image

Fig. 3. XRD patterns of CoCrFeNi raw powder and CoCrFeNi-CNTs composite coating

Fig. 4. Sectional metallographic morphologies of CoCrFeNi-CNTs composite coating. (a) Low magnification of metallographic morphology of coating cross section; (b) micro-morphology of region A; (c) micro-morphology of region B; (d) micro-morphology of C region

Fig. 5. TEM microstructure of CoCrFeNi-CNTs composite coating. (a) Intergranular carbide morphology; (b) enlarged morphology of D region

Fig. 6. SEM microstructure of unknown substances in CoCrFeNi-CNTs composite coating

Fig. 7. Comparison of microhardness distributions in CoCrFeNi-CNTs and CoCrFeNi coatings

Fig. 8. SEM microstructures of CoCrFeNi-CNTs composite coating under different salt spray corrosion time. (a) 36 h; (b) 168 h; (c) 269 h (imaging in secondary electron mode); (d) 269 h (imaging in backscatter mode); (e) distribution of C element in area E; (f) distribution of Si element in area E