scholarly journals Performance of Methanolic Extract of Artemisia herba alba as a Potential Green Inhibitor on Corrosion Behavior of Mild Steel in Hydrochloric Acid Solution

2021 ◽  
Vol 11 (6) ◽  
pp. 14751-14763
Keyword(s):  
Adsorption Isotherm ◽  
Mild Steel ◽  
Corrosion Behavior ◽  
Methanolic Extract ◽  
Electrochemical Impedance ◽  
Sem Analysis ◽  
Langmuir Adsorption Isotherm ◽  
Active Centers ◽  
Green Inhibitor ◽  
Langmuir Adsorption

The influence of the methanolic extract of Artemisia herba alba (MEAHA) as a potential green inhibitor on the corrosion behavior of mild steel in 1M HCl solution in the presence of different concentrations (200 to 500 ppm) was explored and investigated using weight loss (WL) method, potentiodynamic polarization (PDP) technique, electrochemical impedance spectroscopy (EIS) measurement, scanning electron microscope (SEM) analysis, energy dispersive spectroscopy (EDS), temperature effect, Langmuir adsorption isotherm, and kinetic thermodynamic parameters. Obtained results suggest that the increases in MEAHA concentration lead to increases in the anti-corrosive protection efficiencies, which are 91, 89, and 90% for WL, PDP, and EIS, respectively. SEM analysis resulting after soaking in the corrosion inhibitor solution, the surface of mild steel is still relatively smooth for 24 h. Adsorption of MEAHA obeyed Langmuir adsorption isotherm model. Also, MEAHA green inhibitor is very well adsorbed by the active centers on MS area.

scholarly journals Corrosion Inhibition of Mild Steel in Acid Solution by 3,4,5-Trimethoxyphenyl-2-imidazolines

2011 ◽  
Vol 8 (2) ◽  
pp. 671-679 ◽  
Author(s):  
D. Nalini ◽  
R. Rajalakshmi ◽  
S. Subhashini
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Mixed Mode ◽  
Anodic Polarization ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Langmuir Adsorption Isotherm ◽  
Sem Images ◽  
Acid Media ◽  
Langmuir Adsorption

A heterocyclic imidazoline, 3,4,5-trimethoxyphenyl-2-imidazolines (TMP2I) was tested for its corrosion inhibition in 0.5 M H2SO4and 1 M HCl using weight loss, Tafel polarisation and electrochemical impedance techniques. The results show that the inhibition efficiency increases with the increase in concentration of TMP2I and the higher efficiency of about 98% is obtained in both the acid media at 20 ppm. The adsorption of TMP2I obeys Langmuir adsorption isotherm and occurs spontaneously. Cathodic and anodic polarization curves of mild steel in the presence of different concentrations of TMP2I at 300C reveal that it is a mixed type of inhibitor. Electrochemical impedance studies reveal that the system follows mixed mode of inhibition. The surface morphology of the mild steel specimens was evaluated using SEM images

scholarly journals Performance Evaluation of Sargassum Polycystum C. Agardh Seaweed Extract as Green Inhibitor for Acid Corrosion of Mild Steel

2019 ◽  
Vol 35 (1) ◽  
pp. 241-254 ◽  
Author(s):  
R. Thilagavathi ◽  
A. Prithiba ◽  
R. Rajalakshmi
Keyword(s):  
Mild Steel ◽  
Acidic Medium ◽  
Acid Corrosion ◽  
Langmuir Adsorption Isotherm ◽  
Seaweed Extract ◽  
Electrochemical Technique ◽  
Green Inhibitor ◽  
Sargassum Polycystum ◽  
Langmuir Adsorption ◽  
Loss Method

The inhibition for the corrosion of mild steel in acid solution by the extract of Sargassum polycystum seaweed was studied using electrochemical technique and mass loss method. The results obtained show that the seaweed extract could serve as an effective inhibitor for the corrosion of mild steel in acidic medium. It was noticed that the inhibitor concentration, immersion time and temperature influenced the IE. The adsorption of the Sargassum polycystum extract molecules onto the metal surface obeyed Langmuir adsorption isotherm. Surface topography studies suggested the protection of MS surface from corrosion by the adsorption of inhibitor molecules onto the MS surface

scholarly journals COVID-19 Vaccine, Contraceptive, Viscosity and Safety Margin Change

2021 ◽  
Vol 11 (2) ◽  
pp. 3509-3512
Keyword(s):  
Adsorption Isotherm ◽  
Mild Steel ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Safety Margin ◽  
Steel Corrosion ◽  
Langmuir Adsorption Isotherm ◽  
Langmuir Adsorption ◽  
Mild Steel Corrosion ◽  
Hcl Solution

The temperature effect of 4-ethyl-1-(4-oxo-4-phenylbutanoyl)thiosemicarbazide (EOPT) on the mild steel corrosion in 1 M HCl solution was studied by gravimetric techniques at temperatures varying from 303 to 333 K. The investigated inhibitor concentrations were started from 100 ppm and ended with 500 ppm. The inhibition efficiency increased with the increase of the concentration of the inhibitor and reached 96.1% with the concentration of 500 ppm at 303 K and decreased to 66.3% at 333 K. Moreover, the inhibition efficiencies decreased with the temperature increase for both acids. Using the Langmuir adsorption isotherm for the adsorption of this inhibitor on the mild steel surface was determined. EOPT was found to be an efficient corrosion inhibitor due to its structural molecules, which contain sulfur, nitrogen, and oxygen, hetero atoms an addition to the aromatic ring.

Adsorption and Inhibitive Properties of 1-phenylaminomethyl-benzimidazole on Corrosion of Mild Steel in Hydrochloric Acid

2014 ◽  
Vol 989-994 ◽  
pp. 536-539 ◽  
Author(s):  
Tie Jun Su ◽  
Ke Hua Li
Keyword(s):  
Hydrochloric Acid ◽  
Adsorption Isotherm ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Potentiodynamic Polarization ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Langmuir Adsorption Isotherm ◽  
Mild Steel Surface ◽  
Langmuir Adsorption

The corrosion inhibition of mild steel in 5.0 M HCl by 1–phenylaminomethyl-benzimidazo -le (PMB) was studied by gravimetric and potentiodynamic polarization methods. Inhibition efficiency of PMB increased with increase in the concentration of inhibitor and decreased with the increase in temperature. PMB acts as anodic-type inhibitor for mild steel. The adsorption of PMB on mild steel surface obeys the Langmuir adsorption isotherm.

OAT EXTRACT AS A NATURAL CORROSION INHIBITOR FOR MILD STEEL IN 3% NaCl SOLUTION

2021 ◽  
pp. 2150084
Author(s):  
A. ZAABAR ◽  
R. AITOUT ◽  
D. AMOURA ◽  
R. MAIZIA ◽  
D. AIT ABDESSELAM ◽  
...  
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Surface Condition ◽  
Sem Analysis ◽  
Environmental Legislation ◽  
Polarization Data ◽  
Langmuir Adsorption ◽  
Natural Corrosion

In this work, we have tested a new inhibitor formulation that is effective, economically efficient and in accordance with environmental legislation. The inhibitor tested is the crude extract of the oat plant (denoted as OE) obtained by the reflux method in the water. This extract is then used as a corrosion inhibitor of mild steel in 3% NaCl. This study was carried out by using electrochemical polarizations, Electrochemical Impedance Spectroscopy and gravimetric techniques. The results obtained showed that this extract satisfactorily inhibits the dissolution rate of mild steel. The inhibition efficiency increases with inhibitor concentration and reaches 72% at 5[Formula: see text]g[Formula: see text][Formula: see text][Formula: see text]L[Formula: see text] of oat extract. Polarization data indicate that the extract acted as mixed type. The adsorption of the inhibitor on the mild steel surface in 3% NaCl follows the Langmuir adsorption isotherm. SEM analysis of the electrode surface condition confirms the results obtained.

scholarly journals Diffusion of calcium ions in retinal rods. A theoretical calculation.

1981 ◽  
Vol 77 (4) ◽  
pp. 475-487 ◽  
Author(s):  
S McLaughlin ◽  
J Brown
Keyword(s):  
Diffusion Coefficient ◽  
Adsorption Isotherm ◽  
Calcium Ions ◽  
Outer Segment ◽  
Effective Diffusion ◽  
Langmuir Adsorption Isotherm ◽  
Diffuse Double Layer ◽  
Langmuir Adsorption ◽  
Retinal Rods ◽  
Disk Membrane

The Fick diffusion equation is combined with the Langmuir adsorption isotherm and the relevant equations from the Gouy-Chapman theory of the electrical diffuse double layer to demonstrate that the effective diffusion coefficient of calcium ions, both in the cytoplasm of the rod outer segment and within the aqueous space bounded by the disk membrane, should be reduced by a factor of 10-100 because these ions adsorb to phospholipids present in the disk membrane.

A further note on the measurement of the affinity of a dye (Azure A) for histological substrates

1965 ◽  
Vol s3-106 (76) ◽  
pp. 299-306
Author(s):  
D. J. GOLDSTEIN
Keyword(s):  
Adsorption Isotherm ◽  
Goblet Cell ◽  
Binding Sites ◽  
Langmuir Isotherm ◽  
Langmuir Adsorption Isotherm ◽  
Intestinal Epithelial ◽  
Langmuir Adsorption ◽  
Azure A ◽  
First Approximation ◽  
The Ideal

If two histological sections, of thickness nµ and 2nµ, and having the same apparent intensity of staining, are at equilibrium with dyebaths of concentration B1 and B2 respectively, the affinity of the histological substrate for the dye is, under denned conditions, given by the expression ΔF° = - RT In I/B, where B is either (i) B2 if the thinner section is stained to saturation, or (ii) B1 if B1 = 3B2. The affinity tends to be greater when measured in a weaker dyebath, as implied in method (ii). Evidence is presented suggesting that the uptake of the basic dye Azure A by pancreatic basal chromidial substance, goblet cell mucin and intestinal epithelial cytoplasm follows a Langmuir adsorption isotherm to a first approximation, in that, at low dyebath concentrations, the uptake of dye is proportional to the concentration of dyebath with which the substrate is in equilibrium, while in strong dyebaths the uptake approaches a plateau. A deviation from the ideal Langmuir isotherm in dyebaths of moderate concentration, observed in epithelial cytoplasm and to a lesser extent in pancreatic basal chromidial substance, may have been due to interaction between neighbouring dye-binding sites, or to the presence in a single area of sites with different affinities for the dye.

scholarly journals Newly Synthesized N-Substituted Thiosemicarbazone as a Potential Corrosion Inhibitor for Mild Steel in 1 M HCl

2019 ◽  
Vol 7 (4.14) ◽  
pp. 168
Author(s):  
N Z. Nor Hashim ◽  
K Kassim ◽  
F H. Zaidon
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Potentiodynamic Polarization ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Langmuir Adsorption ◽  
Before And After ◽  
Ft Ir ◽  
L1 And L2

Two N-substituted thiosemicarbazone derivatives namely as 2-(4-chlorobenzylidene)-N-phenylhydrazinecarbothioamide and 2-benzylidene-N-phenylhydrazinecarbothioamide (L1 and L2, respectively) have been tested as corrosion inhibitors on mild steel in 1 M HCl. The ligands were synthesized and investigated using potentiodynamic polarization (PD) and electrochemical impedance spectroscopy (EIS).  The obtained results indicated that inhibition efficiency, (IE, %) L1 increased with increasing inhibitor concentrations which behaved as a good corrosion inhibitor compared to L2. The synthesized ligands were successfully characterized by melting point, elemental analysis (C, H, N, and S), Fourier-transform infrared spectroscopy (FT-IR) and NMR (1H and 13C) spectroscopy. The excellent inhibition effectiveness for both compounds on mild steel before and after immersion in 1 M HCl solution containing 40 ppm of L1 and L2 were also verified by scanning electron microscope (SEM). Based on potentiodynamic polarization results, it can be concluded that all investigated compounds are mixed-type inhibitors and obey the Langmuir adsorption isotherm. 

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