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

Abdul Amir H Kadhum; Abu Bakar Mohamad; Leiqaa A Hammed; Ahmed A Al-Amiery; Ng Hooi San; Ahmed Y Musa

doi:10.3390/ma7064335

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

Materials (Basel). 2014 Jun 5;7(6):4335-4348. doi: 10.3390/ma7064335.

Authors

Abdul Amir H Kadhum¹, Abu Bakar Mohamad², Leiqaa A Hammed³, Ahmed A Al-Amiery^{4

5}, Ng Hooi San⁶, Ahmed Y Musa⁷

Affiliations

¹ Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia. amir@eng.ukm.my.
² Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia. drab@eng.ukm.my.
³ Environmental Research Center, University of Technology, Baghdad 10066, Iraq. leiqaa.technology@gmail.com.
⁴ Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia. dr.ahmed@eng.ukm.my.
⁵ Environmental Research Center, University of Technology, Baghdad 10066, Iraq. dr.ahmed@eng.ukm.my.
⁶ Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia. hooisan_ng@hotmail.com.
⁷ Department of Chemistry, Western University, London, ON N6A 5B7, Canada. amusa6@uwo.ca.

Abstract

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.

Keywords: corrosion inhibitor; coumarin; potentiodynamic; terephthalaldehyde.