Fig. 2: Optical micrographs of the Cr-coated Zr tube oxidized at different conditions.
From: Oxidation behavior of Cr-coated zirconium alloy cladding in high-temperature steam above 1200 °C

a 1200 oC/0.5 h, b 1200 oC/1 h, c 1200 oC/2 h, d 1200 oC/4 h, e 1300 oC/0.5 h, f 1300 oC/1 h.