Synthesis and characterization of an inorganic-organic nanomaterial for use as corrosion inhibitor for mild steel in HCl
Original scientific paper
DOI:
https://doi.org/10.5599/jese.3441Keywords:
Low-carbon steel corrosion, zinc acetate, omeprazole, nanocomposite, inhibition efficiencyAbstract
The study of corrosion inhibitors for mild steel in HCl is crucial for enhancing the service life of industrial infrastructure, especially in environments prone to rapid deterioration and high maintenance costs. In this work, a zinc acetate-omeprazole nanomaterial (ZO) was prepared and its corrosion inhibition performance on mild steel deterioration in 0.5 M HCl solution was investigated using electrochemical techniques. The particles of the nanomaterial (with sizes ranging from 2.70 to 6.37 nm) predominantly exhibited a spherical to near-spherical morphology, with relatively smooth, well-defined edges. The mean hydrodynamic diameter of particles (Z-average diameter) of 59.79 nm indicates that the particles are primarily in the nanoscale range. The X-ray diffraction pattern of ZO revealed distinct diffraction peaks superimposed on a broad background, indicating the coexistence of crystalline and amorphous phases. A decrease in corrosion current density from 1781 µA cm-2 in the uninhibited medium to 1315 µA cm-2 upon the introduction of 0.1 g L-1 of ZO was observed. A progressive decline in corrosion current density was observed as inhibitor concentration increased. The shifts in corrosion potential were relatively small, suggesting that the inhibitor exhibits a mixed-type inhibition mechanism rather than a purely anodic or cathodic one. The charge transfer resistance increased from 210.21 Ω cm² in the absence of ZO to 230 Ω cm² in its presence (0.1 g L-1). The electrochemical impedance spectroscopy results indicated that the highest inhibition efficiency achieved in this study was 77.6 % at 0.4 g L-1 ZO concentration. The inhibition efficiency increased with increasing inhibitor concentration. These findings indicate that the synthesized nanomaterial effectively mitigates corrosion of mild steel in 0.5 M HCl solution.
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