Fig. 3
The SEM micrographs for the Al x CrFe1.5MnNi0.5 alloys with different molar concentrations of Al, after the anodic polarisation exceeded the breakdown potential (>1.25 V SHE) in 0.5 M H2SO4 a x = 0, b x = 0.3 mol, c x = 0.5 mol, d a higher magnification image of the inset in micrograph c (a–d reprinted from ref. 27 with permission from Elsevier)
