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  Nano-sized cerium vanadium oxide as corrosion inhibitor: A microstructural and release study

Govindaraj, Y., Venkatachalam, D., Prabhakar, J. M., Manikandanath, N. T., Balaraju, J. N., Rohwerder, M., et al. (2022). Nano-sized cerium vanadium oxide as corrosion inhibitor: A microstructural and release study. Electrochimica Acta, 425: 140696. doi:10.1016/j.electacta.2022.140696.

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Govindaraj, Yoganandan1, Author
Venkatachalam, Durgambika1, Author
Prabhakar, J. Manoj2, Author           
Manikandanath, Natarajan Thayee3, Author
Balaraju, Jayam Nagabushan3, Author
Rohwerder, Michael2, Author           
Neelakantan, Lakshman1, 4, Author
Affiliations:
1Corrosion Engineering and Materials Electrochemistry Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India, ou_persistent22              
2Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2074315              
3CSIR National Aerospace Laboratories, Post Bag No. 1779, HAL Airport Road, Bangalore 560017, India, ou_persistent22              
4Ceramic Technologies Group - Centre of Excellence in Materials and Manufacturing for Futuristic Mobility, Indian Institute of Technology Madras, Chennai 600036, India, ou_persistent22              

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 Abstract: The synthesized, nano-sized cerium vanadate is proposed as a self-healing corrosion inhibitor for ferrous alloys (e.g., automotive high strength steel (HSS) and mild steel (MS)). Cerium vanadate prepared at two different pH conditions (neutral and basic) showed similar corn-like morphology with nanorod structure. UV-Vis spectroscopy studies revealed that the release rate of cerium vanadate-B (basic condition) was higher than cerium vanadate-N (neutral condition) in 0.1 M NaCl solution. The specimen exposed to 0.1 M NaCl containing a supersaturated solution of cerium vanadate-B (1000 ppm) revealed 8 times and 6 times lower corrosion current density values for HSS and MS respectively than that of the one without corrosion inhibitor. There was a gradual increase in the film resistance (R-film) on both HSS and MS observed as a function of exposure time in corrosive medium containing cerium vanadate-B inhibitor. An order higher impedance values were observed for both HSS and MS immersed for 168 h, highlighting the self-healing effect of the cerium vanadate compound. The X-ray photoelectron spectroscopy results showed the presence of multivalent oxidation states of both cerium and vanadium species. The inhibiting action is attributed to the high solubility of cerium vanadate in the corrosive medium to form a film on the metal surface. The dissolution/solubility of the corrosion inhibitor was more favorable in neutral to alkaline conditions than in acidic conditions.

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Language(s): eng - English
 Dates: 20222022-09-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.electacta.2022.140696
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Title: Electrochimica Acta
  Abbreviation : Electrochim. Acta
Source Genre: Journal
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Publ. Info: Oxford, UK : Pergamon-Elsevier Science Ltd
Pages: - Volume / Issue: 425 Sequence Number: 140696 Start / End Page: - Identifier: ISSN: 0013-4686
CoNE: https://pure.mpg.de/cone/journals/resource/954925396434