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Article

The Influence of REE β-Diketone Complexes on the Corrosion Behaviour of Mild Steel and 304 SS in 3.5% NaCl Solution

1
School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private Bag X3, Johannesburg 2050, South Africa
2
Department of Natural Science, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester M1 5GD, UK
3
Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag X3, Johannesburg 2050, South Africa
*
Author to whom correspondence should be addressed.
Academic Editor: Kenneth N. Han
Minerals 2022, 12(4), 416; https://doi.org/10.3390/min12040416
Received: 4 March 2022 / Revised: 23 March 2022 / Accepted: 23 March 2022 / Published: 29 March 2022
(This article belongs to the Special Issue Rare Earth Metals and PGM: Beneficiation, Recovery and Quantification)
In the present investigation, four REE β-diketone complexes, namely cerium acetylacetone, cerium hexafluoroacetylacetone, lanthanum acetylacetone, and lanthanum hexafluoroacetylacetone, were investigated as potential corrosion inhibitors for mild steel and 304 stainless steel in 3.5% NaCl solution. The corrosion-inhibition effects of the REE β-diketone complexes were investigated using weight-loss measurements and potentiodynamic polarisation scans. Surface analyses using optical microscopy and scanning electron microscopy (SEM) were used to investigate the morphology of the mild steel and 304 stainless steel after the weight-loss and potentiodynamic tests in 3.5% NaCl solution containing 0.5% mass per volume (m/v) concentration of the tested inhibitor. Fourier transform infrared spectroscopy and Raman spectroscopy were further used to probe the type of corrosion product film that forms on the surface of the tested samples. The obtained results revealed that the four REE β-diketone complexes are very effective inhibitors against corrosion of mild steel and 304 stainless steel in a 3.5% NaCl in a temperature range of 20–60 °C. View Full-Text
Keywords: REE β-diketone complexes; corrosion inhibitors; potentiodynamic polarisation; Raman spectroscopy REE β-diketone complexes; corrosion inhibitors; potentiodynamic polarisation; Raman spectroscopy
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MDPI and ACS Style

Lawal, O.J.; Potgieter, J.H.; Billing, C.; Whitefield, D.J. The Influence of REE β-Diketone Complexes on the Corrosion Behaviour of Mild Steel and 304 SS in 3.5% NaCl Solution. Minerals 2022, 12, 416. https://doi.org/10.3390/min12040416

AMA Style

Lawal OJ, Potgieter JH, Billing C, Whitefield DJ. The Influence of REE β-Diketone Complexes on the Corrosion Behaviour of Mild Steel and 304 SS in 3.5% NaCl Solution. Minerals. 2022; 12(4):416. https://doi.org/10.3390/min12040416

Chicago/Turabian Style

Lawal, Olatunde J., Johannes H. Potgieter, Caren Billing, and David J. Whitefield. 2022. "The Influence of REE β-Diketone Complexes on the Corrosion Behaviour of Mild Steel and 304 SS in 3.5% NaCl Solution" Minerals 12, no. 4: 416. https://doi.org/10.3390/min12040416

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