Novel Corrosion Inhibitor for Mild Steel in HCl

Ahmed A Al-Amiery; Abdul Amir H Kadhum; Abdul Hameed M Alobaidy; Abu Bakar Mohamad; Pua Soh Hoon

doi:10.3390/ma7020662

Novel Corrosion Inhibitor for Mild Steel in HCl

Materials (Basel). 2014 Jan 27;7(2):662-672. doi: 10.3390/ma7020662.

Authors

Ahmed A Al-Amiery^{1

2}, Abdul Amir H Kadhum³, Abdul Hameed M Alobaidy⁴, Abu Bakar Mohamad⁵, Pua Soh Hoon⁶

Affiliations

¹ Department of Chemical and Process Engineering, Universiti Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia. dr.ahmed1975@gmail.com.
² Environmental Research Center, University of Technology (UOT), Baghdad 10001, Iraq. dr.ahmed1975@gmail.com.
³ Department of Chemical and Process Engineering, Universiti Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia. amir@eng.ukm.my.
⁴ Environmental Research Center, University of Technology (UOT), Baghdad 10001, Iraq. abdulhameedalobaidy@gmail.com.
⁵ Department of Chemical and Process Engineering, Universiti Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia. drab@eng.ukm.my.
⁶ Department of Chemical and Process Engineering, Universiti Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia. hoon1024psh@gmail.com.

Abstract

Corrosion inhibitory effects of new synthesized compound namely 5,5'- ((1Z,1'Z)-(1,4-phenylenebis(methanylylidene))bis(azanylylidene))bis(1,3,4-thiadiazole-2-thiol) (PBB) on mild steel in 1.0 M HCl was investigated at different temperatures using open circuit potential (OCP), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). Results showed that PBB inhibited mild steel corrosion in acid solution and indicated that the inhibition efficiencies increased with the concentration of inhibitor, but decreased proportionally with temperature. Changes in impedance parameters suggested the adsorption of PBB on the mild steel surface, leading to the formation of protective films.

Keywords: EIS; OCP; corrosion inhibition; mild steel; thiadiazole.