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Inhibition of Mild Steel Corrosion in Sulfuric Acid Solution by New Schiff Base

Department of Chemical & Process Engineering, University Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia
Applied Science Department, University of Technology (UOT), Baghdad 10001, Iraq
Author to whom correspondence should be addressed.
Materials 2014, 7(2), 787-804;
Received: 21 October 2013 / Revised: 22 November 2013 / Accepted: 2 January 2014 / Published: 28 January 2014
PDF [1607 KB, uploaded 28 January 2014]


The efficiency of Schiff base derived from 4-aminoantipyrine, namely 2-(1,5-dimethyl-4-(2-methylbenzylidene)amino)-2-phenyl-1H-pyrazol-3(2H)-ylidene) hydrazinecarbothioamide as a corrosion inhibitor on mild steel in 1.0 M H2SO4 was investigated using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PD) and electrochemical frequently modulation (EFM) in addition to the adsorption isotherm, corrosion kinetic parameters and scanning electron microscopy (SEM). The results showed that this inhibitor behaved as a good corrosion inhibitor, even at low concentration, with a mean efficiency of 93% and, also, a reduction of the inhibition efficiency as the solution temperature increases. A polarization technique and EIS were tested for different concentrations and different temperatures to reveal that this compound is adsorbed on the mild steel, therefore blocking the active sites, and the adsorption follows the Langmuir adsorption isotherm model. The excellent inhibition effectiveness of 2-(1,5-dimethyl-4-(2-methylbenzylidene)amino)-2-phenyl-1H-pyrazol-3(2H)-ylidene)hydrazinecarbothioamide was also verified by scanning electron microscope (SEM). View Full-Text
Keywords: electrochemical measurements; SEM; corrosion inhibitor electrochemical measurements; SEM; corrosion inhibitor
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Al-Amiery, A.A.; Kadhum, A.A.H.; Kadihum, A.; Mohamad, A.B.; How, C.K.; Junaedi, S. Inhibition of Mild Steel Corrosion in Sulfuric Acid Solution by New Schiff Base. Materials 2014, 7, 787-804.

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