**5.11. Cathodic Plasma Electrolytic Deposition (CPED) method**

Inconel alloys (IN738) have a wide range of applications in industries as high temperature structural materials. Further, different surface treatments and coatings have been developed for the improvement of the properties of Inconel alloys. Bahadori et al. [41] deposited Al2O3 ceramic coating on MCrAlY bond-coated Ni-based superalloy using the CPED method in an ethanol solution of Al (NO3)3.9H2O (18 g/l). Several samples were prepared under different deposition conditions and characterized by XRD, SEM, and energy dispersive X-ray spec‐ trometer (EDS). The XRD analysis confirmed the presence of Al2O3 and Ni3Al phases. The results were in good agreement with the composition of the MCrAlY bond coat based on the thermal expansion data. SEM micrograph showed changes in the microstructure of the specimen by varying the pH of the solution [41].
