Azo Dye Compounds as Corrosion Inhibitors for Dissolution of Mild Steel in Hydrochloric Acid Solution

The effect of some mono-, bis- and tris-azo dyes compounds on the dissolution of mild steel in 1.0 M HCl solution was studied using weight loss and potentiodynamic polarization measurements. The inhibition efficiency was found to increase with increasing concentration of the inhibitors and with decreasing temperature. The adsorption of different azo dyes on the mild steel surface obeys the Langmuir adsorption isotherm. Polarization studies indicate that the compounds used are mixed type inhibitors. The thermodynamic functions of adsorption processes were calculated from weight loss at different temperatures data and were used to analyze the inhibitor mechanism. The surface morphology of the mild steel specimens was evaluated using SEM and EDAX analysis. To provide an evidence for the formation of the complex, UV-VIS spectra of solutions were investigated. From previous results (I.E.%, ΔGads, SEM, EDAX and UV-VIS spectra) are likely to get into the possiblity of configure the complex on the mild steel surface.

Bibliographic Details

Main Authors:	Nagiub,A.M., Mahross,M.H., Khalil,H.F.Y., Mahran,B.N.A., Yehia,M.M., El-Sabbah,M.M.B.
Format:	Digital revista
Language:	English
Published:	Sociedade Portuguesa de Electroquímica 2013
Online Access:	http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042013000200005
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