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Basha Nusrath Unnisa, Chan,Nirmala Devi, Gowraraju,Hemapriya, Venkatesan,Chitra, Subramanian,Chung, Ill-Min,Kim, Seung-Hyun,Prabakaran, Mayakrishnan Elsevier 2018 Construction & building materials Vol.165 No.-
<P><B>Abstract</B></P> <P>As a motto of framing the strategies to minimise the deterioration in steel reinforced concrete structures as well as the fact that the work carried out with polymers are rare and scanty, polyesters namely Poly (Glycerol azealate) (PGAZ) and 4-(1-(4-methoxy phenyl) cyclo hexyl)phenyl 9-oxodecanoate (MPOD) were synthesised and evaluated for rebar corrosion in simulated concrete pore solution (SCP) for the first time at selected concentrations of 10, 100, 1000 ppm levels with an aid of electrochemical impedance and potentiodynamic polarisation techniques. Nyquist plots favoured increased R<SUB>ct</SUB> values suggesting the formation of barrier. Tafel plots represented cathodic inhibition. The experimental datas were best fitted with Langmuir adsorption isotherm facilitating monolayer adsorption. Both the methods employed were in good agreement with each other favouring maximum inhibition efficiency of 71.81% for MPOD and minimum of 57.64% for PGAZ primarily due the difference in aromatic sites as revealed in mechanism.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effect of polymers at minimum concentrations were evaluated. </LI> <LI> Regression co-efficient close to unity intended best fit with Langmuir adsorption. </LI> <LI> Cathodic inhibition was projected from polarisation technique. </LI> <LI> Increase in R<SUB>ct</SUB> values increased inhibition efficiency. </LI> <LI> Proposed mechanism favoured higher inhibition for aromatic than aliphatic moieties. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Floxacins: as Mediators in Enhancing the Corrosion Inhibition Efficiency of Natural Polymer Dextrin
Gowraraju Nirmala Devi,Chan Basha Nusrath Unnisa,Selvaraj Mohana Roopan,Venkatesan Hemapriya,Subramanian Chitra,정일민,김승현,Mayakrishnan Prabakaran 한국고분자학회 2020 Macromolecular Research Vol.28 No.6
Three different floxacins (Ciprofloxacin, Levofloxacin, and Norfloxacin) were used to enhance the inhibition property of Dextrin (Dex) against the dissolution of mild steel in acid medium. Substantial increase in the inhibition property was observed against mild steel dissolution by the addition of floxacins than with pure Dex. Weights loss experiments proved the potential of Fluoroquinolones (FQs) in enhaning the corrosion inhibition property of Dex on metal by proving its best ability at lower concentrations. Adsorption of Dex and floxacins on metal surface was observed to accept with Langmuir adsorption isotherm. The results from EIS studies add to the enhancing property of floxacins on Dex. While the mixed type behavior of inhibitors were confirmed by polarization studies, images from SEM, EDS and AFM gathers strength to propose the formation of protective layer.