RHIZOPHORA APICULATA AS ECO-FRIENDLY INHIBITOR AGAINST MILD STEEL CORROSION IN 1 M HCL

Mohammad Ali Asaad, Mohammad Ismail, Pandian Bothi Raja and Nur Hafizah A. Khalid
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Mohammad Ali Asaad: Department of Civil Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
Mohammad Ismail: Department of Civil Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
Pandian Bothi Raja: #x2020;Center for Corrosion Research, Universiti Teknologi Petronas, Seri Iskandar 32610 Tronoh, Perak, Malaysia
Nur Hafizah A. Khalid: Department of Civil Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia

Surface Review and Letters (SRL), 2017, vol. 24, issue Supp01, 1-11

Abstract: The inhibitive characteristics of aqueous extracts from mangrove (Rhizophora apiculata) bark and leaf on the corrosion of mild steel (MS) coupon in 1 M HCl were examined by means of the gravimetric measurement (weight loss), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The MS surface morphologie were investigated using field emission scanning electron microscopy (FESEM) with Energy Dispersive X-Ray Analysis (EDX) at 120h in the presence and absence of green inhibitors in corrosive medium. Respective inhibition efficiencies of 68.1% and 59.0% were obtained when exposed to 10% v/v Rhizophora apiculata solution for 72h. Examination of the adsorption behavior of the solutions indicated the Langmuir isotherm model as being the most likely relevant adsorption mechanism. In addition, polarization measurements showed that both bark and leaves extract inhibitors act via mixed type inhibition.

Keywords: Rhizophora apiculata; mild steel; corrosion inhibition; plant extract; weight loss; adsorption (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X18500130

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