Abstract

Neha Parekh^*, Divya Ladha, Poonam Wadhwani, Suresh Kumar and Nisha Shah

DOI : http://dx.doi.org/10.13005/ojc/320422

In this study, the improvement in the corrosion inhibition efficiency of a natural inhibitor (coriander seed extract) incorporated with zinc oxide nanoparticles (np-natural inhibitor) was investigated using the gravimetric method and electrochemical methods. The weight loss method indicated that a 25.7% and 57.1% inhibition efficiency (I%) were found when using 0.66 g/L of natural inhibitor and np-natural inhibitor, respectively. Moreover, as the temperature increases, the I% also increases for both inhibitors, suggesting a chemisorption mechanism. EIS revealed that the polarization resistance value (R_p) of np-natural inhibitor is greater than that of the natural inhibitor, indicated that np-natural inhibitor was more resistive. The Temkin adsorption isotherm gave the best fit for both the inhibitors. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) showed the surface morphology of the zinc metal in the absence and presence of both the inhibitors.

Chemisorption; Natural inhibitor; EIS; Surface analysis; nanoparticles

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