Exploration of DHNPMHC Complex as an Efficient Corrosion Inhibitor for Copper in Acidic Medium
Keywords:
Corrosion, DHNPMHC, Schiff base, Copper, Inhibitor, Weight loss method, SEMAbstract
The present investigation evaluates the corrosion inhibition performance of a thiourea-based Schiff base, 2-[(3,4-dihydroxy-5-nitrophenyl)methylidene]hydrazine-1-carbothioamide (DHNPMHC), and its metal complex for copper dissolution in hydrochloric acid medium. DHNPMHC was synthesized via condensation of 3,4-dihydroxy-5-nitrobenzaldehyde with thiosemicarbazide and subsequently complexed with metal ions to enhance its surface activity. Structural characterization was carried out using UV–Visible spectroscopy, FT-IR spectroscopy, and elemental analysis. Corrosion inhibition efficiency was evaluated using the weight loss method, adsorption isotherm analysis, and surface morphology studies.
The results demonstrate that DHNPMHC exhibits strong adsorption on the copper surface, leading to a significant reduction in corrosion rate. Inhibition efficiency increases with increasing inhibitor concentration and decreases with prolonged immersion time. Adsorption of the inhibitor follows the Langmuir adsorption isotherm, indicating monolayer formation on the metal surface. SEM analysis confirms the formation of a smooth and protective film in the presence of the inhibitor. The findings suggest that the DHNPMHC complex can serve as an efficient and environmentally benign corrosion inhibitor for copper in acidic industrial environments.
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