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Natural corrosion inhibitors with calcium carbonate components have been a focus of research
in the corrosion prevention discipline due to their superior characteristics compared to other inhibitors.
Eggshells are a candidate as corrosion inhibitor for this purpose, because a very high concentration of
calcium carbonate is obtained from eggshells, therefore studying their effect on the corrosion behavior
of mild steel is important. The inhibitor properties were assessed by FTIR
and XRD. Corrosion performance was studied using a weight loss method in a 1.0 molar hydrochloric acid solution. Besides, the corrosion rate and inhibition efficiency evaluated were also calculated to determine what effect the concentration of eggshell has on mild steel. Eggshells increase the contents of CaCO3 on the surface, which lowers the rate of corrosion because it
absorbs the CaCO3 more effectively and it is therefore recognized as the metal surface protection. The
findings show that eggshells as natural corrosion abatement agents exhibited better protection
characteristics and pointed out the practical exploitation of eggshell waste to achieve low corrosion in
mild steel under acidic conditions.