i) 2017 - 37 Documents
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Item Β-SITOSTEROL ISOLATED FROM RICE HULLS AS AN EFFICIENT CORROSION INHIBITOR FOR MILD STEEL IN ACIDIC ENVIRONMENTS(Royal Society of Chemistry, 2017-04-05) Mayakrishnan, Prabakaran; Seung-Hyun, Kim; Asokan, Sasireka; Venkatesan, Hemapriya; Ill-Min, Chungβ-Sitosterol has an inhibiting effect on the corrosion of mild steel. We investigated this effect in a H2SO4 solution using β-sitosterol-3-O-β-D-glucoside (β-sitosterol) isolated from rice hulls. Proton nuclear magnetic resonance, UV-visible spectroscopy, FT-IR spectroscopy, weight loss measurements, electrochemical studies, and atomic absorption spectroscopy were used to examine the inhibition of β-sitosterol on mild steel corrosion in a 1 M H2SO4 solution. The effect of temperature on the corrosion behavior of mild steel was examined in the range of 303–333 ± 1 K. The inhibition efficiency increased with increasing inhibitor concentration and decreased with increasing temperature. Electrochemical studies indicated that isolated β-sitosterol acted as a good corrosion inhibitor. The surface morphologies of the mild steel specimens were analyzed by scanning electron microscopy. The maximum inhibition efficiency of β-sitosterol (500 ppm) was 95%. The surface morphology was identified using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM-EDS), and atomic force microscopy (AFM).Item EXPERIMENTAL AND THEORETICAL STUDIES ON INHIBITION OF BENZOTHIAZINES AGAINST CORROSION OF MILD STEEL IN ACIDIC MEDIUM(Emerald Publishing Limited, 2017-05-02) Venkatesan, Hemapriya; Mayakrishnan, Prabakaran; Kandasamy, Parameswari; Subramaniyan, Chitra; Seung-Hyun, Kim; Ill-Min, ChungThe aim of this paper was to investigate the corrosion inhibition potential of two synthesized benzothiazines, namely, 3,4-dihydro-2-methoxycarbonylmethyl-3-oxo-2H-1,4-benzothiazine (1) and ethyl 3-oxo-3,4-dihydro-2H-1,4-benzothiazine-2-carboxylate (2) on mild steel corrosion in 1M H2SO4.Item ASTER KORAIENSIS AS NONTOXIC CORROSION INHIBITOR FOR MILD STEEL IN SULFURIC ACID(Elsevier, 2017-08-25) Mayakrishnan, Prabakaran; Seung-Hyun, Kim; Nithiyanandham, Mugila; Venkatesan, Hemapriya; Kandasamy, Parameswari; Subramanian, ChitraInhibition efficiency of Aster koraiensis leaf extract toward corrosion of mild steel in 1 M H2SO4 solution was investigated using weight loss, electrochemical, FT-IR, SEM, and EDX methods The individual phenolic compounds present in A. koraiensis extract were identified. Maximum efficiency of 90.53% was achieved at 2000 ppm of the extract. The corrosion kinetic parameters determined from the polarization curves indicated that the extract acted as a mixed-type inhibitor. Adsorption of the inhibitor on the mild steel surface obeyed the Langmuir isotherm. SEM investigations confirmed the formation of inhibition layer unto the metal surface by compounds present in the extract.