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Some environmentally friendly formulations as inhibitors for mild steel corrosion in sulfuric acid solution

Some environmentally friendly formulations as inhibitors for mild steel corrosion in sulfuric... The corrosion resistance of mild steel in 1 M H2SO4 solution was evaluated after addition of Sn2+ and Zn2+, N-acetylcystein (ACC) and S-benzylcystein (BzC) as a function of concentration (5–1000 μM) and solution temperature (35–50°C). Eight blends were also investigated. Both polarization resistance (R p) and electrochemical impedance spectroscopy (EIS) were employed. For single additives, Zn2+ ions acted as accelerator for mild steel corrosion while the other additives showed good performance. The most effective additive was Sn2+. Adsorption of Sn2+, ACC and BzC obeyed the Temkin adsorption isotherm and had a very high negative value of free energy of adsorption (−ΔG°ads). All blends provided good inhibition which increased with rise in temperature. Corrosion kinetic parameters such as activation energy (E a) and the pre-exponential factor (λ) were calculated and discussed. EIS revealed that the interface of the uninhibited and inhibited systems can be represented by the simple equivalent circuit R e(R ct Q dl). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Electrochemistry Springer Journals

Some environmentally friendly formulations as inhibitors for mild steel corrosion in sulfuric acid solution

Journal of Applied Electrochemistry , Volume 37 (6) – Apr 7, 2007

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References (37)

Publisher
Springer Journals
Copyright
Copyright © 2007 by Springer Science+Business Media, Inc.
Subject
Chemistry; Industrial Chemistry/Chemical Engineering; Physical Chemistry ; Electrochemistry
ISSN
0021-891X
eISSN
1572-8838
DOI
10.1007/s10800-007-9297-1
Publisher site
See Article on Publisher Site

Abstract

The corrosion resistance of mild steel in 1 M H2SO4 solution was evaluated after addition of Sn2+ and Zn2+, N-acetylcystein (ACC) and S-benzylcystein (BzC) as a function of concentration (5–1000 μM) and solution temperature (35–50°C). Eight blends were also investigated. Both polarization resistance (R p) and electrochemical impedance spectroscopy (EIS) were employed. For single additives, Zn2+ ions acted as accelerator for mild steel corrosion while the other additives showed good performance. The most effective additive was Sn2+. Adsorption of Sn2+, ACC and BzC obeyed the Temkin adsorption isotherm and had a very high negative value of free energy of adsorption (−ΔG°ads). All blends provided good inhibition which increased with rise in temperature. Corrosion kinetic parameters such as activation energy (E a) and the pre-exponential factor (λ) were calculated and discussed. EIS revealed that the interface of the uninhibited and inhibited systems can be represented by the simple equivalent circuit R e(R ct Q dl).

Journal

Journal of Applied ElectrochemistrySpringer Journals

Published: Apr 7, 2007

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