Electrochemical Behavior of C6.9 Mild Steel Corrosion Inhibition in Phosphoric Acid Using Extracted Aqueous of Red Pomegranate Peels

Abstract

Corrosion inhibition of C6.9 mild steel alloy in 2M H3PO4 solution by extracted aqueous of red pomegranate peels (EARPP) as an green inhibitor have been investigated using Half – cell potentials measurments, electrochemical polarization technique measurments has been utilized to assess the corrosion parameters: Icorr., Ecorr., βc , βa and RP have been calculated using Extrapolation of cathodic and anodic Tafel plot and resistance of linear polarization technique. Experimental design of Taguchi procedure (EDTP) was applied for distribution of the polarization experiments conditions. The data obtained from the utilized two techniques are in great concurrence with each other. These investigations have demonstrated that EARPP is a very good "green", blended sort inhibitor. The inhibition procedure was ascribed to the formation of an adsorbed layer on the surface of metal that protects the metal against corrosive agents. The most important feature achieved was the polarization curves showed for a given temperature and exposure time, the corrosion potential Ecorr of inhibited curves were shifted towards the potential axis, leading to lower corrosion rates Icorr, as the inhibitor concentration increased. The protective film formation on metal surface is investigated by means of FTIR.