Browsing by Author "Kadapparambil, S."

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Electrochemical investigation of the corrosion inhibition mechanism of Tectona grandis leaf extract for SS304 stainless steel in hydrochloric acid
(2017) Kadapparambil, S.; Yadav, K.; Ramachandran, M.; Victoria, Selvam, N.
The use of Tectona grandis leaf extract as a green corrosion inhibitor for stainless steel 304 (SS304) in 2 m hydrochloric acid was investigated using electrochemical techniques. Potentiodynamic polarization studies with different inhibitor concentrations showed that the inhibitor is of mixed type, which works by affecting both cathodic and anodic reactions. Adsorption analysis using the potentiodynamic polarization and electrochemical impedance spectroscopy runs result in standard free energy of adsorption values between -20 kJ mol-1 and -40 kJ mol-1, indicating a comprehensive adsorption, which is a mixture of both physisorption and chemisorptions processes. Fourier transform infrared spectroscopy studies show the appearance of new peaks and shift in peak positions at some locations with the use of an inhibitor, which indicates the interaction between the inhibitor molecules and metal surface. Contact angle analysis indicates the formation of hydrophobic film on the metal surface. 2017 Walter de Gruyter GmbH, Berlin/Boston.
Electrochemical investigation of the corrosion inhibition mechanism of Tectona grandis leaf extract for SS304 stainless steel in hydrochloric acid
(Walter de Gruyter GmbH info@degruyter.com, 2017) Kadapparambil, S.; Yadav, K.; Ramachandran, M.; Noyel Victoria, N.V.
The use of Tectona grandis leaf extract as a green corrosion inhibitor for stainless steel 304 (SS304) in 2 m hydrochloric acid was investigated using electrochemical techniques. Potentiodynamic polarization studies with different inhibitor concentrations showed that the inhibitor is of mixed type, which works by affecting both cathodic and anodic reactions. Adsorption analysis using the potentiodynamic polarization and electrochemical impedance spectroscopy runs result in standard free energy of adsorption values between -20 kJ mol-1 and -40 kJ mol-1, indicating a comprehensive adsorption, which is a mixture of both physisorption and chemisorptions processes. Fourier transform infrared spectroscopy studies show the appearance of new peaks and shift in peak positions at some locations with the use of an inhibitor, which indicates the interaction between the inhibitor molecules and metal surface. Contact angle analysis indicates the formation of hydrophobic film on the metal surface. © 2017 Walter de Gruyter GmbH, Berlin/Boston.
Tectona grandis leaf extract as environmental friendly corrosion inhibitor for SS304 stainless steel in hydrochloric acid
(2018) Kadapparambil, S.; Yadav, K.; Ramachandran, M.; Selvam, N.V.
The corrosion inhibitory effects of Tectona grandis (teak) leaves extract, for stainless steel 304 (SS304) in 2 M hydrochloric acid was investigated using gravimetric technique and scanning electron microscopy (SEM). The gravimetric results showed that the corrosion rate decreases with increase in inhibitor concentration. The maximum inhibition efficiency of 65% for teak leaves was obtained at 1000 ppm extract concentration. It was found that the inhibition efficiency increased with temperature. The studies revealed that the teak leaf extract acts as a mixed type inhibitor. Adsorption of the inhibitor molecules on the surface of stainless steel followed comprehensive adsorption. National Rehabilitation Association. All rights reserved.
Tectona grandis leaf extract as environmental friendly corrosion inhibitor for SS304 stainless steel in hydrochloric acid
(Scientific Publishers, 2018) Kadapparambil, S.; Yadav, K.; Ramachandran, M.; Noyel Victoria, N.V.
The corrosion inhibitory effects of Tectona grandis (teak) leaves extract, for stainless steel 304 (SS304) in 2 M hydrochloric acid was investigated using gravimetric technique and scanning electron microscopy (SEM). The gravimetric results showed that the corrosion rate decreases with increase in inhibitor concentration. The maximum inhibition efficiency of 65% for teak leaves was obtained at 1000 ppm extract concentration. It was found that the inhibition efficiency increased with temperature. The studies revealed that the teak leaf extract acts as a mixed type inhibitor. Adsorption of the inhibitor molecules on the surface of stainless steel followed comprehensive adsorption. © National Rehabilitation Association. All rights reserved.