Analysis of inhibitory properties of neodymium tartrate and comparison with neodymium chloride for mild steel in neutral sodium chloride solution
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 5 October 2023
Issue publication date: 20 November 2023
Abstract
Purpose
This paper aims to investigate the eco-friendly neodymium tartrate (NdTar) inhibitor for mild steel in sodium chloride (NaCl) solution.
Design/methodology/approach
The mild steel 1010 coupon was considered for the current study. Weight loss and the electrochemical methods were used to evaluate the inhibitory effects of neodymium chloride (NdCl3) and NdTar on mild steel in NaCl solution. Scanning electron microscopy, energy-dispersive X-ray analysis and attenuated total reflectance-Fourier transform infrared spectroscopy measurements were carried out to study the morphology and composition of the film, nature of deposits and corrosion products formed in test media on the corroded steel, with the objective of further analyzing the observed behavior of the two inhibitors.
Findings
Of the two, NdTar performs better than NdCl3 because it shields mild steel surfaces for longer. According to the results, when NdCl3 is present in a corrosive solution, the protective film only comprises Nd/Fe oxide/hydroxide/carbonate. However, when neodymium is coupled with the tartrate group (an organic group) and then added to the NaCl solution, the inhibitor film comprises both bimetallic complexes (Fe-Tar-Nd) and metal oxide/hydroxide/carbonate, which results in a more compact film and has higher inhibition efficiency.
Originality/value
This study evaluated the combined effects of inorganic and organic inhibitors with those of an inorganic inhibitor used alone for mild steel in NaCl solution.
Keywords
Acknowledgements
The authors would like to express their appreciation to the Indian Institute of Technology Roorkee (IIT Roorkee), India, for providing a characterization facility. Minakshi Koundal would like to thank the funding agency University Grants Commission (UGC), Government of India, for giving a fellowship and other financial assistance for her PhD thesis study.
Citation
Koundal, M., Singh, A.K. and Sharma, C. (2023), "Analysis of inhibitory properties of neodymium tartrate and comparison with neodymium chloride for mild steel in neutral sodium chloride solution", Anti-Corrosion Methods and Materials, Vol. 70 No. 6, pp. 341-349. https://doi.org/10.1108/ACMM-05-2023-2799
Publisher
:Emerald Publishing Limited
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