Ni-Al polyvanadate layered double hydroxide with nanoceria decoration for enhanced corrosion protection of aluminium alloy

The present study introduces a modified layered double hydroxide (LDH) based system for corrosion inhibition on dual actions by both active and passive mechanisms. Nickel aluminium LDH (NiAl LDH) intercalated with vanadate ion was further decorated with ceria nanoparticles. The modifications of LDH...

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Bibliographic Details
Published in:Applied clay science 2021-09, Vol.211, p.106199, Article 106199
Main Authors: Pancrecious, Jerin K., Vineetha, S.V., Bill, Ulaeto Sarah, Gowd, E. Bhoje, Rajan, T.P.D.
Format: Article
Language:English
Subjects:
Ceria
Composite coating
Corrosion inhibition
Layered double hydroxide
Polyvanadate
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Summary:The present study introduces a modified layered double hydroxide (LDH) based system for corrosion inhibition on dual actions by both active and passive mechanisms. Nickel aluminium LDH (NiAl LDH) intercalated with vanadate ion was further decorated with ceria nanoparticles. The modifications of LDH were confirmed by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, infrared and Raman spectroscopy. We have investigated the effect of nanoceria decoration on NiAl LDH for the corrosion inhibition efficiency with and without intercalation of vanadate species on A356 aluminium alloy by electrochemical analysis and immersion test. The bare metallic substrates in 3.5 wt% sodium chloride solution containing inhibitor loaded LDH were tested to understand the inhibition mechanism. The presence of stable ceria nanoparticles layer can be an effective cathode, which passively protects the metal from corrosive anions and water molecules. The release of vanadate species during anion exchange of LDH with chloride ion in the corrosive environment and formation of polymeric vanadate on the surface actively protects the metal from further corrosion. The modified LDH loaded epoxy composite coatings were also made on A356 alloy to study the corrosion resistance in the real applications. [Display omitted] •CeO2 nanoparticles were decorated on NiAl polyvanadate LDH.•The influence of CeO2 as well as VOx on corrosion inhibition was investigated.•Higher anti-corrosion performance was observed in both inhibitors modified LDH.•Modified-LDH-Epoxy coating on A356 alloy enhanced its corrosion resistance.
ISSN:0169-1317
1872-9053
DOI:10.1016/j.clay.2021.106199