Corrosion inhibition adsorption behaviour and thermodynamic properties of N-cinnamalidene palmitohydrazide on mild steel in hydrochloric acid solution

Nor Azowa Ibrahim, . and Yeong Shoot Kian, . and Chan Chung Hung, . and Tang Sook Wah, . and Noor Khairin Mohd, . and Lim Wen Huei, . and Siti Mariam Mohd Nor, . and Zainab Idris, . Corrosion inhibition adsorption behaviour and thermodynamic properties of N-cinnamalidene palmitohydrazide on mild steel in hydrochloric acid solution. pp. 124-138. ISSN 1511-2780

The corrosion inhibitory efficiency of N-cinnamalidene palmitohydrazide (CPH) on mild steel in 1 M hydrochloric acid solution was studied using Tafel polarisation electrochemical impedance spectroscopy and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX). Tafel polarisation analysis showed that the maximum inhibition efficiency (·Tafel) approached 95 in the presence of 200 mg litre- of CPH at 328K. The percentage inhibition efficiency increased with increasing inhibitor concentration and temperature of the test medium. Tafel polarisation study clearly revealed that CPH functions as a mixed-type inhibitor with a predominant anodic control. The adsorption of CPH on mild steel surface obeyed the Langmuirs adsorption isotherm. The evaluation of the thermodynamic and activation parameters indicated that the adsorption of CPH on the mild steel surface took place spontaneously through both physisorption and chemisorption with Gibbs free energy of adsorption (”Gads) values from -34.33 kJ mol- to -41.38 kJ mol-1. Impedance spectroscopy analysis showed that corrosion of mild steel in 1 M hydrochloric acid solution was mainly controlled by a charge transfer process and CPH formed a protective film on the metal-solution interface. The protective film was further confirmed by SEM images and the elemental analysis that measured by EDX analysis.

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Abstract

The corrosion inhibitory efficiency of N-cinnamalidene palmitohydrazide (CPH) on mild steel in 1 M hydrochloric acid solution was studied using Tafel polarisation electrochemical impedance spectroscopy and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX). Tafel polarisation analysis showed that the maximum inhibition efficiency (·Tafel) approached 95 in the presence of 200 mg litre- of CPH at 328K. The percentage inhibition efficiency increased with increasing inhibitor concentration and temperature of the test medium. Tafel polarisation study clearly revealed that CPH functions as a mixed-type inhibitor with a predominant anodic control. The adsorption of CPH on mild steel surface obeyed the Langmuirs adsorption isotherm. The evaluation of the thermodynamic and activation parameters indicated that the adsorption of CPH on the mild steel surface took place spontaneously through both physisorption and chemisorption with Gibbs free energy of adsorption (”Gads) values from -34.33 kJ mol- to -41.38 kJ mol-1. Impedance spectroscopy analysis showed that corrosion of mild steel in 1 M hydrochloric acid solution was mainly controlled by a charge transfer process and CPH formed a protective film on the metal-solution interface. The protective film was further confirmed by SEM images and the elemental analysis that measured by EDX analysis.

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Item Type:	Article
AGROVOC Term:	Steel
AGROVOC Term:	Construction materials
AGROVOC Term:	Corrosion
AGROVOC Term:	Chemical analysis (results)
AGROVOC Term:	Spectroscopy
AGROVOC Term:	Hydrazides
AGROVOC Term:	Hydrochloric acid
AGROVOC Term:	Inhibition
AGROVOC Term:	Adsorption
AGROVOC Term:	Polarization
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8953

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