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Materials 2014, 7(2), 787-804; doi:10.3390/ma7020787
Article

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

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Received: 21 October 2013; in revised form: 22 November 2013 / Accepted: 2 January 2014 / Published: 28 January 2014
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Abstract: 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).
Keywords: electrochemical measurements; SEM; corrosion inhibitor electrochemical measurements; SEM; corrosion inhibitor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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.

AMA Style

Al-Amiery AA, Kadhum AAH, Kadihum A, Mohamad AB, How CK, Junaedi S. Inhibition of Mild Steel Corrosion in Sulfuric Acid Solution by New Schiff Base. Materials. 2014; 7(2):787-804.

Chicago/Turabian Style

Al-Amiery, Ahmed A.; Kadhum, Abdul A.H.; Kadihum, Abdulhadi; Mohamad, Abu B.; How, Chong K.; Junaedi, Sutiana. 2014. "Inhibition of Mild Steel Corrosion in Sulfuric Acid Solution by New Schiff Base." Materials 7, no. 2: 787-804.


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