Electrochemical and theoretical investigation on the corrosion of aluminium in acidic solution containing some Schiff bases
APPLIED SURFACE SCIENCE, vol.253, no.2, pp.919-925, 2006 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 253 Issue: 2
- Publication Date: 2006
- Doi Number: 10.1016/j.apsusc.2006.01.026
- Journal Name: APPLIED SURFACE SCIENCE
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.919-925
- Keywords: corrosion, aluminium, Schiff base, hydrochloric acid, quantum chemical calculations, MILD-STEEL, INHIBITION, DERIVATIVES, CHLORIDE
- Anadolu University Affiliated: No
Abstract
The effect of newly synthesised three Schiff bases-2-[2-aza-2-(5-methyl(2-pyridly))vinyl]phenol, 2-[2-aza-2-(5-methyl(2-pyridly))vinyl]-4-bromophenol, 2-[2-aza-2-(5-methyl(2-pyridly))vinyl]-4-chlorophenol-on the corrosion behaviour of aluminium in 0.1 M HCl were investigated using potentiodynamic polarisation, electrochemical impedance spectroscopy and linear polarisation methods. Polarisation curves indicate that all studied Schiff bases were acting as mixed type inhibitors. All measurements show that inhibition efficiencies increase with increase in inhibitor concentration. This reveals that inhibitive actions of inhibitors were mainly due to adsorption on aluminium surface. Adsorption of these inhibitors follows Langmuir adsorption isotherm. Thermodynamic parameters of adsorption (K-ads,K-Delta G(ads)) of studied Schiff bases were calculated using Langmuir adsorption isotherm. The variation in inhibition efficiency values depends on the type of functional groups substituted on benzene ring. It was found that the presence of bromine and chlorine atoms in the molecular structure of studied Schiff bases facilitate the adsorption of molecule on aluminium surface.