Investigation of anticorrosive properties of some ionic liquids on selected metals

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dc.contributor.advisor Legodi, M. A.
dc.contributor.advisor Murulana, L. C.
dc.contributor.advisor Kirui, J. K.
dc.contributor.author Nkuna, Anitah
dc.date 2018
dc.date.accessioned 2018-06-05T16:22:56Z
dc.date.available 2018-06-05T16:22:56Z
dc.date.issued 2018-05-18
dc.identifier.uri http://hdl.handle.net/11602/1120
dc.description MSc (Chemistry)
dc.description Department of Chemistry
dc.description.abstract The corrosion potential of three ionic liquids (ILs) namely, 5-(Trifluoromethyl)dibenzothiophenium tetrafluoroborate (TDTB), 5-(Trifluoromethyl)dibenzothiophenium trifluoromethanesulfonate (TDTM) and 1-Ethyl-3-methylimidazolium ethyl sulfate [EMIM][ESO4] was studied for mild steel and zinc corrosion in 1.0 M hydrochloric acid using electrochemical, spectroscopic and gravimetric techniques. The studied ILs showed appreciable inhibition efficiencies at the considered concentration range. The highest inhibition efficiencies were observed at 30°C when inhibitor concentration was 8.0 × 10-2 M. The gravimetric data revealed that inhibition efficiencies decreased with an increase in temperature, the lowest inhibition efficiencies for mild steel and zinc were observed at 50°C. The potentiodynamic polarization results indicated that all three inhibitors are mixed-type inhibitors, with TDTM being a predominantly anodic inhibitor. The orders of inhibition efficiency at 8.0 × 10-2 M were TDTM > TDTB > [EMIM][ESO4] and TDTB > TDTM > [EMIM]ESO4] for mild steel and zinc, respectively. All inhibitors showed superior performance in mild steel than in zinc. The adsorption of the studied ILs on mild steel and zinc obeyed the Langmuir adsorption isotherm. The Gibbs free energy of adsorption (ΔG°ads) indicated that the adsorption process was spontaneous, and that corrosion inhibition occurred by a physical adsorption process. Surface morphology analysis through scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) revealed a great improvement in the surface morphologies of mild steel and zinc specimens in the inhibited systems. The Fourier transform infrared spectroscopy studies confirmed the chemical interactions between the metal surface and the ILs. This is observed by means of the disappearance of characteristic absorption bands in the adsorption film FTIR spectra. en_US
dc.description.sponsorship NRF en_US
dc.format.extent 1 online resource (xi, 115 leaves : illustrations (some color)
dc.language.iso en en_US
dc.rights University of Venda
dc.subject Corrosion en_US
dc.subject Anticorrosive properties en_US
dc.subject Ionic liquids en_US
dc.subject Trifluoromethyl dibezothoophenium tetrafluoroborate (TDTB) en_US
dc.subject.ddc 541.372
dc.subject.lcsh Ionic solutions
dc.subject.lcsh Surface
dc.subject.lcsh Ionization
dc.subject.lcsh Ions
dc.subject.lcsh Metal ions
dc.subject.lcsh Physics
dc.title Investigation of anticorrosive properties of some ionic liquids on selected metals en_US
dc.type Dissertation en_US

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