CORROSION INHIBITION EFFICACY OF DRUGS IN 1 M HCL MEDIUM ON CARBON AND MILD STEELS: EXPERIMENTAL AND THEORETICAL COMPARATIVE STUDY

Metals and alloys, despite their advantageous properties, can suffer from reduced corrosion resistance when exposed to certain environments, leading to high costs of repair or replacement. In reinforced concrete, the corrosion of steel reinforcements, particularly due to chloride ions, affects material durability. To mitigate the issue, this study evaluated the corrosion inhibition efficiency (EI%) of acetaminophen (A1) and acetylsalicylic acid (A2) on XC48 and mild steel in 1 M hydrochloric acid (HCl). Electrochemical and gravimetric methods showed that both inhibitors were effective, with a 5.10-3 M concentration yielding notable EI%. Adsorption followed the Langmuir model. Moreover, computational simulations based on Density Functional Theory (DFT) were also used in order to acquire a more in-depth and detailed understanding of how the inhibitor compounds form interactions with the metallic surface layers, with the aim of enhancing corrosion inhibition performance. The results highlight the importance of material management strategies and ongoing research to maximise the durability of metal structures, reduce environmental impacts and improve the efficiency of corrosion inhibition methods

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