Effect of pigeon pea seed (isoflavone) molecules on corrosion inhibition of mild steel in oilfield descaling solution: electro-kinetic, DFT modeling and optimization studies
| Autor: | Chidebe Chijoke Uwaleke, V.I. Chukwuike, N.A. Okafor, F. E. Abeng, Okechukwu Dominic Onukwuli, Lei Guo, Valentine Chikaodili Anadebe, Maduabuchi Arinze Chidiebere, P. C. Nnaji |
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| Rok vydání: | 2021 |
| Předmět: |
Tafel equation
Materials science 010405 organic chemistry technology industry and agriculture food and beverages Langmuir adsorption model General Chemistry 010402 general chemistry 01 natural sciences 0104 chemical sciences Corrosion Metal symbols.namesake Chemical engineering visual_art Mass transfer visual_art.visual_art_medium symbols Response surface methodology Fourier transform infrared spectroscopy Polarization (electrochemistry) |
| Zdroj: | Journal of the Iranian Chemical Society. 18:2983-3005 |
| ISSN: | 1735-2428 1735-207X |
| Popis: | The focus of recent research has been the development of organic films on the metal surface to achieve a desirable degree of metal protection. In this respect, more attention has been drawn to environmentally friendly compounds. Pigeon pea seed (PPS) extract is one of the natural and biodegradable compounds with a promising potency for corrosion inhibition. In this work, pigeon pea seed extract inhibited mild steel corrosion in strong acid electrolyte. To evaluate the efficiency and provide well-defined mass transfer operations, electro-kinetics, Tafel polarization, weight loss and molecular dynamics were applied. FTIR, SEM and AFM were employed to characterize the structure and nature of the organic film-based complexes formed on the steel plates. For the statistical analysis, particle swarm optimization (PSO) and response surface methodology (RSM) were used to evaluate the interactive effects between the independent variables and the expected responses. The result from electro-kinetics shows that pigeon pea seed extract is a practical protocol for the improvement of reliable steel corrosion resistance. Polarization measurement showed that due to the formation of the pigeon pea seed extract-based film on the mild steel, a successful corrosion inhibition of steel by a mixed-mode mechanism occurred. PPS exhibited good inhibition nature, and its inhibition efficiency can be as high as 94% when the concentration is 0.9 g/L−1 at temperature of 300 K. The adsorption kinetics adheres strictly to Langmuir model. The DFT studies complement with the experimental data. The MIMO model via RSM gave better prediction than PSO. Results from SEM/AFM photographs and FTIR confirmed that complexes based on the pigeon pea seed extract precipitated a protective film on the steel sample. |
| Databáze: | OpenAIRE |
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