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Materials 2013, 6(4), 1420-1431; doi:10.3390/ma6041420

A Novel Hydrazinecarbothioamide as a Potential Corrosion Inhibitor for Mild Steel in HCl

Department of Chemical & Process Engineering, Universiti of Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia
Applied Chemistry Division, Applied Science Department, University of Technology (UOT), Baghdad 10001, Iraq
Author to whom correspondence should be addressed.
Received: 6 January 2013 / Revised: 15 February 2013 / Accepted: 1 March 2013 / Published: 2 April 2013
(This article belongs to the Special Issue Corrosion Monitoring and Control)
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2-(1-methyl-4-((E)-(2-methylbenzylidene)amino)-2-phenyl-1H-pyrazol-3(2H)-ylidene)-hydrazineecarbothioamide (HCB) was synthesized as a corrosion inhibitor from the reaction of 4-aminoantipyrine, thiosemicarbazide and 2-methylbenzaldehyde. The corrosion inhibitory effects of HCB on mild steel in 1.0 M HCl were investigated using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). The results showed that HCB inhibited mild steel corrosion in acidic solution and inhibition efficiency increased with an increase in the concentration of the inhibitor. The inhibition efficiency was up to 96.5% at 5.0 mM. Changes in the impedance parameters suggested that HCB adsorbed on the surface of mild steel, leading to the formation of a protective film. The novel corrosion inhibitor synthesized in the present study was characterized using Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) spectral data.
Keywords: mild steel; thiosemicarbazide; EIS; HCB; corrosion inhibition mild steel; thiosemicarbazide; EIS; HCB; corrosion inhibition
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Al-Amiery, A.A.; Kadhum, A.A.H.; Mohamad, A.B.; Junaedi, S. A Novel Hydrazinecarbothioamide as a Potential Corrosion Inhibitor for Mild Steel in HCl. Materials 2013, 6, 1420-1431.

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