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

• Autor(a) principal: Nagiub,A.M.
• Data de Publicação: 2013
• Outros Autores: Mahross,M.H., Khalil,H.F.Y., Mahran,B.N.A., Yehia,M.M., El-Sabbah,M.M.B.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042013000200005
• topic: azo dyes; mild steel; inhibitors; surface morphology

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.