Fig. 4.

The yield (YS), ultimate (US) strength and elongation values of (a) as-cast and (b) as-rolled Fe and Fe-X (X = Mn, Co, Al, W, Sn, B, C and S) alloys. Adapted from Ref. [36], copyright 2011, Elsevier. (c) The potentio-dynamic polarization curves and SEM images after static immersion tests of 24 h for Fe, Fe₈₇Mg₉Zn₄, Fe₇₄Mg₁₉Zn₇ and Fe₆₀Mg₃₀Zn₁₀ alloys. Adapted from Ref. [61] copyright 2022, Elsevier. (d) 3D height image representing the surface topography of laser-textured and polished Fe–Mn sample before and after 3 days of immersion. Adapted from Ref. [47] copyright 2018, Elsevier. (e) Polarization curve for Fe and Fe/CNTs alloys (0.3–0.9 wt% CNTs contents). (f) Corrosion rate from 28 days' immersion tests for Fe/CNTs samples and (g) SEM image for Fe/1.2CNTs sample after immersion test. Adapted from Ref. [62], copyright 2019, Elsevier.