The inhibitive effect of some bis-N,S-bidentate Schiff bases on corrosion behaviour of 304 stainless steel in hydrochloric acid solution

The inhibition effect of four new Schiff bases on the corrosion of 304 stainless steel in 1 M HCl has been studied by polarization, electrochemical impedance spectroscopy (EIS) and weight loss measurements. Polarization curves indicated that all studied Schiff bases act as mixed type (cathodic/anodi...

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Bibliographic Details
Published in:Corrosion science 2009-05, Vol.51 (5), p.1073-1082
Main Authors: Behpour, M., Ghoreishi, S.M., Soltani, N., Salavati-Niasari, M.
Format: Article
Language:English
Subjects:
A. Stainless steel
Applied sciences
B. EIS
B. Polarization
C. Corrosion inhibition
C. Kinetic parameters
Corrosion
Corrosion environments
Corrosion prevention
Exact sciences and technology
Metals. Metallurgy
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Summary:The inhibition effect of four new Schiff bases on the corrosion of 304 stainless steel in 1 M HCl has been studied by polarization, electrochemical impedance spectroscopy (EIS) and weight loss measurements. Polarization curves indicated that all studied Schiff bases act as mixed type (cathodic/anodic) inhibitors. The adsorption of the inhibitors was well described by the Langmuir adsorption isotherm and the adsorption isotherm parameters ( K ads, Δ G ads) were determined at room temperature. Effect of temperature on the efficiency of the corrosion inhibition process was studied and the values of activation energy, pre-exponential factor ( λ), enthalpy of activation and entropy of activation were calculated to elaborate the mechanism of corrosion inhibition. Differences in inhibition efficiency between four tested inhibitors are correlated with their chemical structures.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2009.02.011