Investigation on corrosion inhibition and adsorption mechanism of azomethine derivatives at mild steel/0.5 M H2SO4 solution interface: Gravimetric, electrochemical, SEM and EDX studies

2022 ◽  
pp. 100330
Author(s):  
Hanane Hamani ◽  
Djamel Daoud ◽  
Sonia Benabid ◽  
Tahar Douadi ◽  
Mousa Al-Noaimi
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Adsorption Mechanism ◽  
Solution Interface

CORROSION INHIBITION EFFICIENCY, ADSORPTION BEHAVIOR, KINETICS AND THERMODYNAMIC STUDIES OF LANNEA ACIDA ETHANOL LEAVES EXTRACT ON MILD STEEL IN HYDROCHLORIC ACID

2021 ◽  
Vol 5 (2) ◽  
pp. 621-634
Author(s):  
Abdulfatai A. Siaka ◽  
Sunday O. Owa ◽  
M. K. Gafar ◽  
J. O. Okunola
Keyword(s):  
Adsorption Isotherm ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Adsorption Mechanism ◽  
Physical Adsorption ◽  
Rate Determining Step ◽  
First Order Kinetics ◽  
Freundlich Adsorption Isotherm ◽  
Entropy Of Activation ◽  
Ft Ir

The corrosion inhibition potential of lannea acida (LA) ethanol leaves extract was investigated using mild steel in 1.0 M HCl solution. The leaves extract was characterized using FT- IR Spectroscopy. The surface analysis of the mild steel was also studied using scanning electron microscopy. The study was carried out at an ambient temperature and selected high temperatures. The LA leaves extract concentration ranges from 0.1- 0.9g/L. The data obtained from weight loss measurements show that the leaves extract repressed the corrosion rate of mild steel. The increase in temperature with a corresponding increase or decrease in the inhibitor efficiency of LA leaves extract shows that the adsorption mechanism obeyed comprehensive adsorption. The value of activation energies (Ea) obtained which ranged from 15.32 to 17.63 kJ mol-1 agrees with the physical adsorption mechanism. The values of enthalpy of activation (ΔH*) obtained were positive and ranged from 38.29 to 59.00 KJ mol-1 is an indication that the dissolution of the mild steel is an endothermic reaction and requires less energy in the presence of LA leaves extract. The values of entropy of activation (ΔS*) obtained which were negative indicate that the activated complex in the rate-determining step is associative rather than dissociative. The kinetics study shows the adsorption process follows first-order kinetics. The adsorption isotherm data fitted best into Freundlich adsorption isotherm

scholarly journals Corrosion Inhibition and Adsorption Characteristics of Tarivid on Mild Steel in H2SO4

2010 ◽  
Vol 7 (s1) ◽  
pp. S442-S448 ◽  
Author(s):  
N. O. Eddy ◽  
E. E. Ebenso
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Physical Adsorption ◽  
Free Energy Of Adsorption ◽  
Langmuir Adsorption ◽  
Adsorption Characteristics ◽  
Kinetic And Thermodynamic Parameters ◽  
Temperature Activation

The corrosion inhibition and adsorption characteristics of (+/-)-9-fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid (Tarivid) on the corrosion of mild steel has been studied using thermometric and gasometric methods. The study reveals that tarivid inhibits the corrosion of mild steel in H2SO4. The values of inhibition efficiency of tarivid were found to increase as its concentration increased but decreased with increase in temperature. Activation energies of the inhibited corrosion of mild steel ranged from 39.05 to 50.61 kJ/mol. Values of enthalpy change and free energy of adsorption were negative which indicated exothermic and spontaneous adsorption process. Physical adsorption mechanism is proposed from the obtained kinetic and thermodynamic parameters. Langmuir adsorption isotherm model is obeyed from the fit of the experimental data.

scholarly journals Corrosion Inhibition Effect of 4-Hydroxy-N′-[(E)-(1H-indole-2-ylmethylidene)] Benzohydrazide on Mild Steel in Hydrochloric Acid Solution

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Preethi Kumari ◽  
Prakash Shetty ◽  
Suma A. Rao
Keyword(s):  
Hydrochloric Acid ◽  
Acid Solution ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Hydrochloric Acid Solution ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Langmuir Adsorption ◽  
Solution Interface ◽  
Inhibition Performance

The inhibition performance and adsorption behaviour of 4-hydroxy-N′-[(E)-(1H-indole-2-ylmethylidene)] benzohydrazide (HIBH) on mild steel in 1 M HCl solution were tested by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The inhibition efficiency of HIBH increases with increase in inhibitor concentration in the temperature range 30–60°C. Polarisation curves indicate that HIBH is a mixed inhibitor, affecting both cathodic and anodic corrosion currents. The adsorption process of HIBH at the mild steel/hydrochloric acid solution interface obeyed Langmuir adsorption isotherm model and inhibition takes place by mixed adsorption, predominantly chemisorption. The activation and thermodynamic parameters for the corrosion inhibition process were calculated to elaborate the mechanism of corrosion inhibition.

Adsorption and corrosion inhibition characteristics of two medicinal molecules

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Hydrochloric Acid ◽  
Corrosion Rate ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Half Life ◽  
Thermodynamic Data ◽  
Inhibition Efficiency ◽  
Gravimetric Method ◽  
Corrosive Environment ◽  
Corrosion Inhibition Efficiency

The corrosion inhibition characteristics of two medicinal molecules phenylalanine and rutin on mild steel in 1.0M Hydrochloric acid were evaluated using gravimetric method. Corrosion inhibition efficiency of 83.78 and 90.40 % was obtained respectively after seven days. However, phenylalanine showed weak accumulative higher corrosion inhibition efficiency. The presence of both molecules in the corrosive environment reduced the corrosion rate constant and increased the material half-life. Thermodynamic data calculated suggests a spontaneous adsorption of the molecules on the mild steel’s surface.

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