Experimental and Theoretical Study to Understand the Adsorption Process of p‐Anisidine and 4‐Nitroaniline for the Dissolution of C38 Carbon Steel in 1M HCl

2022 ◽  
Vol 7 (2) ◽  
Author(s):  
Mohamed Damej ◽  
Abdu Molhi ◽  
Kawtar Tassaoui ◽  
Brahim El Ibrahimi ◽  
Zahra Akounach ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Adsorption Process ◽  
Theoretical Study

scholarly journals Inhibitory action of Vernonia amygdalina extract (VAE) on the corrosion of carbon steel in acidic medium

2017 ◽  
Vol 7 (3) ◽  
pp. 145 ◽  
Author(s):  
Olamide Olawale ◽  
Adesoji Adeolu Adediran ◽  
Segun Isaac Talabi ◽  
Geraldine Chika Nwokocha ◽  
Alewo Opuada Ameh
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Acidic Medium ◽  
Inhibitory Action ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Vernonia Amygdalina ◽  
Protective Oxide ◽  
Mild Carbon Steel ◽  
Stem Extract

<p class="PaperTitle"><span lang="EN-GB">This study investigates the inhibition potential of Vernonia amygdalina stem extract (VAE) on the corrosion of mild carbon steel immersed in 1 M HCl solution containing various concentrations of the inhibitor. The corrosion rate and inhibition efficiency were evaluated using mass loss and adsorption techniques. The results revealed that VAE efficiently inhibits the corrosion rate of mild carbon steel immersed in the acidic medium. The concentration of 0.6 g/L provides the highest inhibition efficiency of 78.1 %. The adsorption process was consistent with the physisorption mechanism and obeyed the Langmuir isotherm. The functional groups responsible for inhibition were identified using Fourier Transform Infrared (FTIR) spectra. The surface morphology of the corroded samples examined with Scanning Electron Microscope (SEM) revealed the presence of protective oxide layer. Inhibition efficiency was found depended on the presence of oxalate, phytate, tannins, saponins and flavonoids in the VAE. It has been concluded that VAE is safe, cheap and efficient corrosion inhibitor for mild carbon steel.</span></p>

scholarly journals GREEN INHIBITORS FOR CORROSION PROTECTION OF N80 CARBON STEEL IN 1M HCl AQUEOUS SOLUTIONS

2012 ◽  
Vol 20 (20) ◽  
pp. 77-98
Author(s):  
A. H. EL-ASKALANY ◽  
S. I. MOSTAFA ◽  
A. M. EID
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Potentiodynamic Polarization ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Electrochemical Impedance ◽  
Physical Adsorption ◽  
Polarization Studies ◽  
Inhibitive Action ◽  
Good Agreement

The inhibitive action of Saponinic extract of both Zygophylium album and Zygophylium Egyptian leaves which could serve as eco-friendly materials was investigated on the corrosion of N80 carbon steel in 1 M HCl solution. The techniques employed for the study were weight loss measurements. potentiodynamic polarization, electrochemical frequency modulation (EFM), and electrochemical impedance spectroscopy (EIS). The results obtained show that these extracts could serve as an effective inhibitor for N80 carbon steel. The percentage inhibition increases with increasing concentration of the inhibitor at 25 °C The percentage inhibitor efficiency above 90% was obtained at a concentration of 700 ppm for both extracts. The corrosion rates of steel and inhibitive efficiencies obtained from impedance and polarization measurements were in good agreement with those obtained from weight loss measurements. Potentiodynamic polarization studies clearly reveal that both extracts act as mixed-type inhibitors The study shows that the inhibition efficiency decreased with the temperature rise of the medium. Heat of adsorption and thermodynamic parameters and indicated that the adsorption process is mainly controlled by the physical adsorption process.

scholarly journals Carbon Nitride Nanotube as a Chemical Sensor for Melamine: A Theoretical Study

2017 ◽  
Vol 60 (4) ◽  
Author(s):  
Reza Moradi ◽  
Javad Hosseini Hosseini
Keyword(s):  
Density Functional ◽  
Carbon Nitride ◽  
Adsorption Process ◽  
Chemical Sensor ◽  
Theoretical Study ◽  
Tube Wall ◽  
High Sensitivity ◽  
Tube Surface ◽  
Promising Candidate ◽  
Short Recovery Time

The interaction of a melamine molecule with a carbon nitride nanotube (CNNT) was explored by means of dispersion-corrected density functional calculations. It was found that melamine prefers to be adsorbed on the porous site of the tube wall with the adsorption energy of -21.9 kcal/mol. This adsorption process significantly shifts the HOMO of the tube to higher energies, thereby reducing the gap of the tube from 3.97 to 2.65 eV. Moreover, the work function is slightly decreased which can facilitate the field electron emission from the tube surface. It is expected that CNNT can be a promising candidate for sensor devices in detecting the melamine molecule with short recovery time and high sensitivity.

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