*2.5. Surface Characterization*

The autoclave corrosion samples were analyzed by SEM, EDS, and XRD before removing the corrosion products. In the XRD analysis, the 2*θ* was 20–80◦ and the scanning rate was 1 ◦/min. The morphology of the corrosion products was observed using SEM with energy-dispersive spectroscopy (EDS). Using an optical digital microscope (OLYM-PUS DSX500, Olympus Optical Industry Co., Ltd., Tokyo, Japan) in the bright field, at 200× magnification, to collect samples after removing corrosion products showed the morphology.
