Browsing by Author "M A, Quraishi"

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    CORROSION INHIBITION OF N80 STEEL IN 15% HCL BY PYRAZOLONE DERIVATIVES: ELECTROCHEMICAL, SURFACE AND QUANTUM CHEMICAL STUDIES
    (Royal Society of Chemistry, RSC advances, 2016-02-04) K R, Ansari; M A, Quraishi; A, Singh; Ramkumar, Sowmya; I B, Obote
    The corrosion protection of N80 steel in 15% HCl by two pyrazolone derivatives namely 2-(3-amino-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)(p-tolyl)methyl)malononitrile (PZ-1) and 2-((3-amino-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)(phenyl)methyl)malononitrile (PZ-2) has been investigated by using gravimetric, electrochemical and quantum chemical studies. The observed results reveal that PZ-1 is a better inhibitor than PZ-2. Tafel polarization showed that PZs are mixed type inhibitors but dominantly affect the cathodic reaction. Both inhibitors were found to obey the Langmuir adsorption isotherm. Scanning electron microscopy (SEM) and scanning electrochemical microscopy (SECM) images support the protection of the N80 steel in the presence of the PZs. Quantum chemical study reveals that both inhibitors have a tendency to get protonated and this result supports the experimental observations.
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    STUDIES ON ADSORPTION AND CORROSION INHIBITIVE PROPERTIES OF QUINOLINE DERIVATIVES ON N80 STEEL IN 15% HYDROCHLORIC ACID
    (Taylor & Francis Group, 2016-01-25) Ramkumar, Sowmya; D, Nalini; M A, Quraishi
    This paper deals with the N80 steel corrosion protection study in 15% HClwhich was carried by three quinoline derivatives namely 3-acetyl-1-(4-methylbenzylideneamino)quinolin-2-one (AQ-1), 3-acetyl-1-(4 hydroxybenzylideneamino)quinolin-2-one (AQ-2), 3-acetyl-1-(3-nitrobenzylideneamino) quinolin-2(1H)-one(AQ-3) using gravimetric, electrochemical, and quantum chemical studies. Tafel polarizationshowed that AQs are mixed type inhibitors but dominantly affect cathodicreaction more. The observed results reveal that AQ-1 is the best inhibitor. All thethree inhibitors were found to obey the Langmuir adsorption isotherm. Scanningelectron microscopy (SEM) micrographs supports the protection of the N80 steel byAQs. Quantum chemical study reveals that the inhibitors have a tendency to getprotonated and this protonated form has greater tendency to get adsorbed onto theN80 steel surface.