Fig. 10. OCP diagram of (a) pristine nickel coating, (b) self-healing coating with 10 g L⁻¹ microcapsules, (c) self-healing coating with 20 g L⁻¹ microcapsules, (d) self-healing coating with 30 g L⁻¹ microcapsules, in the bath and (e) mild steel substrate without coating.