Corrosion inhibition of type N80 carbon steel using eggshell powder in acidic and brine environments: a study based on weight loss testing, micro-indentation, and electrochemical modeling
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Abstract
Corrosion poses a critical challenge to the oil and gas industry, particularly in systems exposed to acidic and high-salinity environments. This study evaluates eggshell powder, a biowaste-derived material, as a green corrosion inhibitor for type N80 carbon steel under conditions representative of acidic and brine environments. Its performance was systematically assessed through weight loss testing, micro-indentation hardness measurements, and numerical electrochemical modeling. N80 steel coupons were exposed to 2 M hydrochloric acid (HCl) and 2 M sodium chloride (NaCl) solutions, with and without 6 g/L of eggshell powder, for 6 days. Corrosion rates determined from mass loss showed substantial protection in the acidic medium, decreasing from 18.8 to 2.1 mm/year and corresponding to an inhibition efficiency of 90 %. In brine, the effect was more moderate, with a 14 % reduction in the corrosion rate. Micro-indentation analysis confirmed that inhibitor-treated samples retained at least 85 % of the hardness of unexposed steel in acid, whereas untreated samples exhibited severe mechanical degradation. The results suggest that corrosion protection arises from a combined mechanism involving the formation of a calcium carbonate barrier, stabilization of the corrosion product layer, and possible scavenging of aggressive chloride ions. Overall, this study demonstrates the potential of eggshell powder as a viable and sustainable candidate for corrosion mitigation in harsh industrial environments.
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