Fig. 8. SEM images of the coating morphology at the interface with the steel substrate before and after 60 days of salt spray corrosion testing. The coatings are identified as follows: (a) WEP, (b) PCNS@CMCS/WEP, (c) PCNS@8-HQ/WEP, and (d) WEP/PCNS@CMCS@8-HQ.