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

Materials

Ahmed A. Al-Amiery²  Abdul Amir H. Kadhum²  Abdulhadi Kadihum¹  Abu Bakar Mohamad²  Chong K. How² 

[1] Applied Science Department, University of Technology (UOT), Baghdad 10001, Iraq; E-Mail:;Department of Chemical & Process Engineering, University Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia; E-Mails:

关键词: electrochemical measurements;    SEM;    corrosion inhibitor;   

DOI  :  10.3390/ma7020787

来源: mdpi

【 摘 要 】

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).

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland