Investigation of the Corrosion Inhibition Properties of Nanoparticle on Milled Steel Synthesized Using Green Method by Gravimetric Analysis

Abstract

In the present study, Zinc oxide nanoparticles were synthesized by green method using zinc acetate, Zinc nitrate, Zinc Chloride and Zinc Sulphate as Salt Precursors while Guava, Jatropha and Cassia leaves extracts serve as stabilizing and capping agents. 1M sodium hydroxide was added in drop to adjust the PH to 11.6 with distilled (DW) water as solvent. The structure and morphology of prepared zinc oxide nanoparticles was studied using X-ray diffraction (XRD) Spectroscopy and Scanning Electron Microscopy (SEM). UV visible spectrum shows the transparency of nanoparticles over entire visible range. In the UV visible spectrometer (UV–Vis) absorption peaks were observed between 372 to 400 nm, and energy band gap between 3.11 – 3.34 eV. The average sizes of the nanoparticles were estimated to range from 15.40 nm to 24.22 nm, while compositions of oxides of different element in the nanoparticles, shows 78.32% and 12.78% for Zinc and Oxygen, respectively. Scanning Electron Microscope (SEM) reveals the presence of Zinc oxide nanoparticles in its agglomerated form. Twelve (12) nanoparticles were selected for the corrosion inhibition to cover all the sizes obtained via the XRD analysis. When the nanoparticles are applied for corrosion inhibition of milled steel in acidic medium the smallest size have the highest relative inhibition efficiency  while the largest size have the lowest relative inhibition efficiency compared to the milled steel exposed to bare acids.