Cyclic Voltammetric and Afm Study of Corrosion Inhibition and Adsorption Behavior of Sodium Dodecyl SULPHATE-ZN2+ on Carbon Steel in Aqueous Medium (original) (raw)
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Anti-Corrosion Methods and Materials, 2005
Purpose -The aim of the present work was to study the synergistic effect of HEDP and zinc on inhibition of the corrosion of carbon steel in neutral oxygen-containing chloride solutions, and to investigate the effect of zinc-HEDP molar ratio on the effectiveness of the zinc-HEDP inhibitive mixtures. Design/methodology/approach -The inhibition of the corrosion of carbon steel by zinc-HEDP mixtures in neutral oxygen-containing solutions was investigated in the presence of 0.003 M (106 ppm) chloride. Findings -It was shown that the inhibition by these mixtures depended not only on the zinc/HEDP molar ratio but also on the concentration of both zinc and HEDP. HEDP concentration appeared to be crucial where good inhibition was not achieved at low concentrations and aggressive nature is observed at high HEDP levels. The effectiveness of the zinc-HEDP mixtures enhanced inhibition by increasing the zinc content of the mixture, but the mechanism was only effective to a certain level, above which the inhibition effect declined. The predominant corrosion control mechanism of the zinc-HEDP mixture was on the anodic (metal dissolution) reaction, but it also affected the rate and mechanism of the oxygen reduction reaction. Originality/value -Demonstrates how the effectiveness of the zinc-HEDP mixtures can enhance inhibition by increasing the zinc content of the mixture.
Materials and Corrosion, 2008
This work aims to analyze, through weight loss and X-ray photoelectron spectroscopy (XPS) methods, the inhibitive films of 1-hydroxyethane-1,1-diphosphonic acid (1-hydroxyethylidene-1,1-diphosphonic acid, HEDP) and zinc(II) ions formed on AISI 1020 carbon steel when immersed in solutions containing 30 ppm of chloride ions, 50 ppm of HEDP, and three different concentrations of zinc(II) ions (14, 20, and 30 ppm). Moreover, the results of the experimental surface analyses were compared to molecular modeling studies of the proposed HEDP-Fe(III)/Zn(OH) 2 /HEDP-Zn(II) protective film. The film presented dissimilar structures responsible for the different levels of metallic protection for each particular zinc(II) concentration. In general, the increase in Zn(II) concentration leads to more compact and adherent film formation, with decreased corrosion rates of carbon steel.
Inhibition of Corrosion of Carbon Steel in Sea Water by Sodium Molybdate – ZN2+ System
European Chemical Bulletin, 2009
The inhibition efficiency of sodium gluconate (SG)–Zn 2+ system in controlling corrosion of carbon steel in sea water has been evaluated by weight-loss method. The formulation consisting of 250 ppm of SG and 75 ppm of Zn 2+ has 98% IE. Influence of duration of immersion on the IE of SG-Zn 2+ has been evaluated. The mechanistic aspects of corrosion inhibition have been investigated by polarization study and AC impedance spectra. The protective film has been analysed by FTIR and luminescence spectra. The surface morphology and the roughness of the metal surface have been analysed by atomic force microscopy. The protective film consists of Fe 2+ - SG complex and Zn(OH) 2. It is found to be UV – fluorescent.