Browsing by Author "Noyel Victoria, S.N."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Azadirachta indica leaves extract as inhibitor for microbial corrosion of copper by Arthrobacter sulfureus in neutral pH conditions-A remedy to blue green water problem
    (Taiwan Institute of Chemical Engineers, 2016) Swaroop, B.S.; Noyel Victoria, S.N.; Ramachandran, R.
    Copper corrosion by the action of aerobic A. sulfureus in neutral medium was investigated. The bacteria form biofilm and colonize on the copper metal surface resulting in corrosion leading to blue green colour water. A. indica (neem) leaf extract was found to be effective in inhibiting the growth of the bacteria and thus help in preventing the corrosion. The copper coupons immersed for different durations in media with and without neem leaf extract were tested for their weight loss to study the corrosion rate. The copper biocorrosion was also investigated using electrochemical impedance spectroscopy and potentiodynamic polarization studies. The morphology of the films formed on the metal surface in different media at different immersion times were studied using scanning electron microscopy. © 2016 Taiwan Institute of Chemical Engineers.
  • No Thumbnail Available
    Item
    Studies on corrosion inhibitory action of ocimum sanctum (Tulsi) leaves extract in mild steel corrosion induced by desulfovibrio desulfuricans
    (National Institute of Science Communication and Information Resources (NISCAIR) ijact.editor@gmail.com Dr. K. S. Krishnan Marg (Near Pusa Gate) New Delhi 110-012, 2018) Chaithra, S.; Gupta, A.; Ramachandran, R.; Noyel Victoria, S.N.
    Studies on the effect of Ocimum sanctum (Tulsi) leaves extract as corrosion inhibitor for mild steel corrosion caused by Desulfovibrio desulfuricans has been carried out. The extract provides 74% inhibition efficiency and is effective up to two weeks. Potentiodynamic polarization studies show the occurrence of pitting corrosion. The electrochemical impedance spectroscopy studies reveal that the nature of the biofilm formed changes continuously. The scanning electron microscopy studies on samples immersed for different durations indicate two layers of different morphologies formed at the end of third and fourth weeks in the uninhibited sample. Energy dispersive x-ray diffraction studies show an increase in sulfide content in uninhibited sample indicating formation of corrosion products. © 2019, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.