Newly synthesized salicylidene-4,4′-dimorpholine (SDM) assembled on nickel oxide nanoparticles (NiONPs) and its inhibitive effect on mild steel in 2N hydrochloric acid

•Nanoparticles with inhibitor were found to be better corrosion inhibitor than only organic compound.•A strong binding mechanism was confirmed by FTIR, PXRD.•Inhibition efficiency increases drastically for SDM assembled on NiONPs as compared to SDM.•The adsorption model obeys Langmuir adsorption iso...

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Bibliographic Details
Published in:Applied surface science 2015-03, Vol.331, p.373-387
Main Authors: Wadhwani, Poonam M., Panchal, Vikram K., Shah, Nisha K.
Format: Article
Language:English
Subjects:
Adsorption
Atomic force microscopy (AFM)
Carbon steels
Corrosion
Corrosion inhibitors
Electrochemical impedance spectroscopy
Hydrochloric acid
Inhibition
Mild steel
Nanoparticles
Nickel oxides
Polarization
Surface chemistry
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Summary:•Nanoparticles with inhibitor were found to be better corrosion inhibitor than only organic compound.•A strong binding mechanism was confirmed by FTIR, PXRD.•Inhibition efficiency increases drastically for SDM assembled on NiONPs as compared to SDM.•The adsorption model obeys Langmuir adsorption isotherm.•The protective layer over the surface of mild steel has been confirmed by AFM analysis. Corrosion inhibition of mild steel in hydrochloric acid solution by salicylidene-4,4′-dimorpholine (SDM) and SDM assembled on nickel oxide nanoparticles (NiONPs) has been studied with gravimetric, electrochemical impedance spectroscopy (EIS) and polarization techniques. Inhibition was found to increase with increasing concentration of the inhibitors. While studying the temperature effect on corrosion behaviour of SDM and SDM assembled on NiONPs, the inhibition efficiency decreases for SDM only but increases for SDM assembled on NiONPs. The adsorption of both the inhibitors on the mild steel surface obeys the Langmuir adsorption isotherm. The activation energy as well as other thermodynamic parameters (ΔH* and ΔS*) for the inhibition process was calculated. EIS analysis results showed that the capacitive loops for SDM assembled on NiONPs were far away from blank when compared with SDM only. Polarization curve shows that the inhibitors are of mixed type. Further, the protective layer formation was confirmed from atomic force microscopy (AFM) results. Various methods such as EIS-MS, 1H NMR, XRD, FTIR, and DLS were performed for the confirmation of the structure, interaction of SDM with NiONPs and size of NiONPs.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2015.01.105