Browsing by Author "Kiruthika, Ayyasamy"

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    ADSORPTION CHARACTERISTICS OF IOTA-CARRAGEENAN AND INULIN BIOPOLYMERS AS POTENTIAL CORROSION INHIBITORS AT MILD STEEL/SULPHURIC ACID INTERFACE
    (Elsevier, 2017-04) Nirmala Devi, Gowraraju; Saranya, Jagadeesan; Kiruthika, Ayyasamy; Lukman O, Olasunkanmi; Eno E, Ebenso; Chitra, Subramani
    The corrosion inhibition efficiency performance of biopolymers Iota-carrageenan (IC) and Inulin (INU) on mild steel in 0.5 M H2SO4 solution was evaluated using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The inhibition efficiency of the inhibitors increased with increase in concentration. Thermodynamic parameters (ΔGads) and activation parameters (Ea, ΔHo, ΔSo) were calculated to investigate the mechanism of inhibition. Polarization studies revealed that the studied inhibitors are mixed type. Scanning electron microscope (SEM), energy dispersive X-ray spectroscopic (EDX) and atomic force microscopy (AFM) studies were used to characterize the surface morphology of inhibited and uninhibited mild steel.
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    POLYESTER-BENTONITE CLAY COMPOSITE: SYNTHESIS, CHARACTERIZATION AND APPLICATION AS ANTICORROSIVE AGENT
    (Oriental Journal of Chemistry, 2015-08-20) Subramanian, Chitra; Sounthari, Palanisamy; Kiruthika, Ayyasamy; Parameswari, Kandasamy
    New polyester-bentonite clay composite was prepared and characterized by FTIR, TGA, SEM& XRD. The XRD and SEM studies are quite supportive of well dispersed polymer clay composite formation. The thermal stability of the polymer was significantly improved as indicated by TGA. The composite was evaluated for its inhibition performance for mild steel corrosion in 1M H2 SO4 by weight loss, polarization and electrochemical impedance techniques. The studies reveal that the clay composite was an excellent adsorption type inhibitor and obeys Langmuir adsorption isotherm. Electrochemical studies showed that the polymer composite was a mixed inhibitor retarding both anodic metal dissolution and cathodic hydrogen evolution