Abstract

Mustafa Sabri Cheyad and Taghried Ali Salman

DOI : http://dx.doi.org/10.13005/ojc/330323

The present research focuses on the inhibition acting of green corrosion inhibitor of aqueous extract of pomegranate peel on α-brass alloy corrosion in 2M H₂SO₄ at temperature range (293-313)K. The pomegranate peel extract was characterized using Fourier infrared Spectroscopy (FTIR), Gas Chromatography Mass Spectroscopy (GC-MS) and Electrochemical polarization. The Tafel Plots revealed that the pomegranate peel extract acts as mixed-type inhibitor in sulfuric acid solution. Inhibition Efficiency (IE%) was increased significantly with increase the inhibitor concentration reaching up to (91.86%) at 500 ppm and decrease with increasing temperature. The corrosion products were investigated using X-ray Diffraction (XRD) analysis which confirmed the aggressivity of sulfate ions and formation of zinc sulfide (ZnS). Scanning Electron Microscope (SEM) examined the α-brass surface corrosion was prevented due to adsorption of inhibitor molecules on its surface. The adsorption of inhibitor molecules on brass obeys langmiur adsorption isotherm.

Corrosion; α-brass; Pomegranate; Polarization; GC-MS; H2SO4

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