Corrosion Behaviour of Mild Steel in the Presence of Ceiba pentandra Extract in Acidic Solution: Adsorption and Mechanism doi.org/10.26538/tjnpr/v6i4.23
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Abstract
Despite the sustained interest in applying plant extracts as inhibitors of metal corrosion, deducing the detailed mechanisms of the inhibition process continues to pose some experimental challenges. To assign the inhibitive effect to the adsorption of any particular constituent is difficult due to the complex chemical compositions of the extracts. Ceiba Pentandra extract (CP) was evaluated as a green and renewable corrosion inhibitor for mild steel corrosion in a 1.0mol/L HCl solution. The inhibition behavior was studied using weight loss, otentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) measurements. In this study, the plant material was separated into various fractions and named the acidic fraction (AF), the basic fraction (BF), the neutral fraction (NF), and the crude fraction (CF). The basic fraction (BF), which yielded over 90% inhibition efficiency at the 500 mg/L dosage level, is considered the most promising fraction. PDP results suggest the BF was more a cathodicinhibitor while the rest were mixed-type inhibitors. Adsorption of the plant material on the mild steel surface obeyed the Langmuir adsorption isotherm. The basic fraction was further analyzed using Gas chromatography-mass spectrometry (GC-MS). The GC-MS result shows that CP extract possesses polar functional groups such as hydroxyl, carbonyl, and hetero-aromatic rings. The inhibition mechanism is closely related to these polar groups.
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