Browsing by Author "Suvarna, A.S."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Adsorption and corrosion inhibition behaviour of Pterocarpus marsupium stem extract on mild steel in acid medium: experimental and statistical approach
    (Taylor and Francis Ltd., 2024) Lavanya, M.; Suvarna, A.S.; Kumari P, P.P.
    The undertaken work shows the efficacy of Pterocarpus marsupium stem extract (PMSE) as an eco-friendly green inhibitor to mitigate the deterioration of mild steel (MS) in various concentrations of hydrochloric acid (HCl) solution using an electrochemical technique. The experiments were conducted by considering acid concentration, inhibition concentration and temperature as the parameters to optimize the inhibition efficiency. The corrosion inhibition of PMSE predominantly owing to protective film formation on the metal surface and is confirmed by surface morphological and FTIR spectral studies. RSM studies using the Taguchi method revealed the highest inhibition efficiency to be predicted at minimum temperature and acid concentration and at the maximum inhibitor concentration as obtained in the experiments. The obtained experimental and statistical study proves PMSE as a potential green corrosion inhibitor for the corrosion inhibition of MS owing to their active constituents and eco-friendliness. © 2023 Canadian Institute of Mining, Metallurgy and Petroleum.
  • No Thumbnail Available
    Item
    New benzisoxazole derivative: A potential corrosion inhibitor for mild steel in 0.5 M hydrochloric acid medium -insights from electrochemical and density functional theory studies
    (Elsevier Ltd, 2023) Kumari P, P.P.; G, A.; Mishma, J.N.C.; Sinha, R.K.; Suvarna, A.S.; Gaonkar, S.L.
    6-fluoro-3-(4-piperidinyl)-1,2-benzisoxazole. HCl (FPBH), a substituted benzisoxazole derivative, was prepared from isonipecotic acid and characterized using various spectroscopic techniques. Using electrochemical examinations such as potentiodynamic polarisation (PDP) and electrochemical impedance spectroscopic (EIS) technique, the corrosion mitigation capabilities of this compound for mild steel (MS) in 0.5 M HCl medium were investigated. Theoretical studies were performed using quantum chemical calculations and density functional theory (DFT). PDP results exhibited the mixed-type behavior of FPBH and showed a maximum efficiency of 94.5 % at 1 × 10−3 M. The development of a protective adsorbed layer of FPBH decreases the corrosion current density (icorr) and corrosion rate (CR). The EIS technique revealed that the rise in the charge transfer resistance (Rct) values and reduction in the thickness of the double-layer capacitance (Cdl) reflected the drop in corrosion rate. The adsorption of FPBH took place through physisorption by conforming Langmuir's isotherm. The DFT method was performed on the optimized structure of FPBH to get additional evidence on the action mode of FPBH with the metal surface. © 2023