Inhibition of Mild Steel Corrosion in Hydrochloric Acid Solution by New Coumarin

Materials

Abdul Amir H. Kadhum²  Abu Bakar Mohamad²  Leiqaa A. Hammed¹  Ahmed A. Al-Amiery²  Ng Hooi San² 

[1] Environmental Research Center, University of Technology, Baghdad 10066, Iraq; E-Mail:;Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia; E-Mails:

关键词: corrosion inhibitor;    coumarin;    potentiodynamic;    terephthalaldehyde;   

DOI  :  10.3390/ma7064335

来源: mdpi

【 摘 要 】

A new coumarin derivative, N,N′-((2E,2′E)-2,2′-(1,4-phenylenebis(methanylylidene))bis(hydrazinecarbonothioyl))bis(2-oxo-2H-chromene-3-carboxamide) PMBH, was synthesized and its chemical structure was elucidated and confirmed using spectroscopic techniques (Infrared spectroscopy IR, Proton nuclear magnetic resonance, ¹H-NMR and carbon-13 nuclear magnetic resonance ¹³C-NMR). The corrosion inhibition effect of PMBH on mild steel in 1.0 M HCl was investigated using corrosion potential (E_CORR), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation (EFM) measurements. The obtained results indicated that PMBH has promising inhibitive effects on the corrosion of mild steel in 1.0 M HCl across all of the conditions examined. Scanning electron microscopy (SEM) was used to investigate the morphology of the mild steel before and after immersion in 1.0 M HCl solution containing 0.5 mM of PMBH. Surface analysis revealed improvement of corrosion resistance in presence of PMBH.

【 授权许可】

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