Fig. 7. SEM micrographs of X-scratched samples after 24 hours of making the scratch (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.