Journal
CORROSION SCIENCE
Volume 78, Issue -, Pages 260-268Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2013.10.007
Keywords
Mild steel; Polarization; EIS; Acid corrosion
Funding
- Scientific Innovation Research of College Graduate in Jiangsu Province [CXLX12-0453]
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The inhibition effect of two Schiffs base derivatives on the corrosion of mild steel in 1.0 M HCl solution was studied by electrochemical techniques, SEM and theoretical calculation methods. The experimental results show that the inhibition efficiency of 2-pyridinecarboxaldehyde thiosemicarbazone (2-PCT) is higher than that of 4-pyridinecarboxaldehyde thiosemicarbazone (4-PCT), and both the two compounds are good inhibitors for mild steel in 1.0 M HCl. Potentiodynamic polarization curves show that the two inhibitors act as mixed type inhibitors. The adsorption of inhibitors obeys the Langmuir adsorption isotherm, and the thermodynamic parameters (E-a, K-ads, Delta G(ads)(0)) were calculated and discussed. The mechanism of inhibition was determined by PZC measurements and theoretical calculation methods. (C) 2013 Elsevier Ltd. All rights reserved.
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