Synergistic effect p-phenylenediamine and n,n diphenylthiourea on the electrochemical corrosion behaviour of mild steel in dilute acid media

Abstract

Electrochemical studies of the synergistic effect of p-phenylenediamine and n,n diphenylthiourea (TPD) as corrosion inhibitor of mild steel in dilute sulphuric and hydrochloric acid through weight loss and potentiodynamic polarization at ambient temperature were performed. Experimental results showed the excellent performance of TPD with an optimal inhibition efficiency of 88.18 and 93.88 % in sulphuric and 87.42 and 87.15 % in hydrochloric acid from both tests at all concentration studied. Polarization studies show the compound to be a mixed-type inhibitor. Adsorption of deanol on the steel surface was observed to obey the Langmuir and Frumkin isotherm models. X-ray diffractometry confirmed the absence of corrosion products and complexes. Optical microscopy confirmed the selective inhibition property of TPD to be through chemical adsorption on the steel surface.

Electrochemical analysis of the corrosion inhibition effect of trypsin complex on the pitting corrosion of 420 martensitic stainless steel in 2M H2SO4 solution

“…The highest Δ G o ads value is -22.20KJmol -1 at the lowest TC concentration; while the lowest Δ G o ads value is -20.76KJmol -1 at the highest TC concentration on 420SS surface due to the effect of lateral repulsion among LTC molecules at higher TC concentration. The Δ G o ads values shows physisorption adsorption mechanisms on 420SS surface, confirming earlier assumption that the inhibition mode is through surface coverage [ 18 , 19 ].…”

Adsorption and Inhibitory Properties of Buchholzia coriacea Seed Extracts on Mild Steel Corrosion in Acidic Media

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However, due to increasing awareness of the toxic properties of most organic corrosion inhibitor compounds in current use, and the accompanying ecological and health risks, researchers are moving towards exploring more environmentally friendly inhibitor sources. [2][3][4][5][6] Available data, points towards plant extracts as the most acceptable candidate in this transition. Plants extracts are not only environmentally safe and available; they are equally effective under a wide range of corrosion environments having similar chemical composition with conventional corrosion inhibitors.

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