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 Adsorption and Inhibitive Properties of Triazolo- pyrimidine Derivatives in Acid Corrosion of Mild Steel

2011 ◽  
Vol 8 (3) ◽  
pp. 1250-1257 ◽  
Author(s):  
K. Parameswari ◽  
S. Chitra ◽  
S. Kavitha ◽  
J. Rajpriya ◽  
A. Selvaraj
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Acid Corrosion ◽  
Langmuir Adsorption Isotherm ◽  
Adsorption Properties ◽  
Pyrimidine Derivatives ◽  
Langmuir Adsorption ◽  
As Adsorption

Inhibitive and adsorption properties of synthesized triazolo- pryimidine derivatives (P1, P2 & P3 ) for the corrosion of mild steel was investigated using weight loss and electrochemical methods. Inhibition efficiency increased as the concentration of the inhibitor increased but decreased with increase in temperature. The triazolopyrimidines were found to act as adsorption inhibitors for the corrosion of mild steel. The adsorption mechanism of the triazolopyrimidine was found to be physisorption, spontaneous and exothermic. Also the adsorption followed Langmuir adsorption isotherm. polarisation studies showed that the inhibitors behave as cathodic type.

scholarly journals INHIBITIVE EFFECT OF COCON NUCIFERA L. (COCONUT PULP) EXTRACT ON MILD STEEL ACID CORROSION

2017 ◽  
Vol 79 (5-3) ◽  
Author(s):  
S. Sobri ◽  
N. Rahim
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Acid Corrosion ◽  
Green Inhibitor ◽  
Industrial Sectors ◽  
Weight Loss Method ◽  
The Common ◽  
Loss Method ◽  
Waste Extract ◽  
Metal And Alloys

In recent years, industrial sectors are concerned with the corrosion of metal and alloys and they also received huge attention from researcher to overcome these problems. To decelerate the rate of corrosion or to stop the corrosion to occur, one of the common methods to deal with this problems is using green inhibitor. The use of local wastes which are organic in nature for the production of green corrosion inhibitor is no doubt the trend of the day. To arrive at an inexpensive non-toxic, eco-friendly inhibitor formulation, the present study on the use of coconut pulp waste extract of Cocon Nucifera L. has been carried out by the weight loss method. The aim of this project is to study the inhibitive effect in terms of time and concentration of the coconut pulp waste extract on the acid corrosion of mild steel in 1.0 M HCL solution. Result showed that the inhibition efficiency was found to increase with increasing inhibitor concentration up to maximum 94.52% for 10 %v/v at 48 hours immersion time. Examination on the extract by Fourier transform infrared spectroscopy (FTIR) confirms that the extract contains functional group of N-H, O-H, C-H, C≡C, C=O, C=C, C-F and C-O that good for corrosion inhibitor while scanning electron microscopy (SEM) studies showed that the deposition of coconut pulp extract on the metal surface. The results of all studies confirmed that the extract of coconut pulp has great potential to prevent the corrosion of mild steel in acidic environment with highest % IE is 94.52 % and the corrosion rate is 3.6919 x10-5.

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.

Hyperhydrophilic three-dimensional crosslinked beads as an effective drug carrier in acidic medium: adsorption isotherm and kinetics appraisal

2015 ◽  
Vol 39 (5) ◽  
pp. 3835-3844 ◽  
Author(s):  
Sachin Mane ◽  
Surendra Ponrathnam ◽  
Nayaku Chavan
Keyword(s):  
Adsorption Isotherm ◽  
Acidic Medium ◽  
Drug Carrier ◽  
Drug Loading ◽  
Three Dimensional ◽  
Langmuir Adsorption Isotherm ◽  
Effective Drug ◽  
Crosslinked Polymers ◽  
Langmuir Adsorption

Langmuir adsorption isotherm demonstrates monolayer drug loading with hyperhydrophilic three-dimensional crosslinked polymers. Furthermore, the pseudo order kinetics were also evaluated.

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 Inhibition Effect of Benzohydrazide Derivatives on Corrosion Behaviour of Mild Steel in 1 M HCl

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
P. Mohan ◽  
R. Usha ◽  
G. Paruthimal Kalaignan ◽  
V. S. Muralidharan
Keyword(s):  
Free Energy ◽  
Mild Steel ◽  
Corrosion Behaviour ◽  
Langmuir Adsorption Isotherm ◽  
Corrosion Process ◽  
Inhibition Effect ◽  
Langmuir Adsorption ◽  
Inhibitor Complex ◽  
Inhibiting Effect ◽  
Free Energy Of Activation

The inhibiting effect of N-benzylidenebenzohydrazide (BBH) andN′-(3-phenylallylidene) benzohydrazide (PABH) on the corrosion inhibition of mild steel in 1 M HCl solutions were determined by weight loss and electrochemical methods. These inhibitors were adsorbed on the surface according to Langmuir adsorption isotherm. Both BBH and PABH have offered inhibition efficiencies upto 97%. The free energy of activation for the corrosion process has suggested the participation of these molecules in the corrosion process. The adsorbed inhibitor complex has offered barrier protection and prevented the corrosion. The dissolution of iron was also retarded thereby they inhibited corrosion. The surface morphology analysis confirmed the presence of a film on the 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.

scholarly journals Electrochemical and Theoretical Studies of 2-Acetyl Pyridine and Acetophenone Derivatives as Corrosion Inhibitors for Mild Steel in HCl Solution

2020 ◽  
Vol 32 (12) ◽  
pp. 3097-3104
Author(s):  
Dharmendra Kumar Singh ◽  
Mantu Kr. Singh
Keyword(s):  
Mild Steel ◽  
Density Functional ◽  
Corrosion Inhibitors ◽  
Langmuir Adsorption Isotherm ◽  
Theoretical Studies ◽  
Dft Methods ◽  
Functional Theory ◽  
Langmuir Adsorption ◽  
Acetophenone Derivatives ◽  
Inhibition Ability

2-Acetyl pyridine nicotinic hydrazone and acetophenone nicotinic hydrazone have prepared and their corrosion inhibition properties for mild steel in 1 M HCl were studied using weight loss, electrochemical and density functional theory (DFT) methods. Both inhibitors showed good inhibition ability and their adsorption on mild obeyed Langmuir adsorption isotherm. Polarization measurements show that they can be classified as inhibitors of mixed type. The inhibition efficiencies of 2-acetyl pyridine nicotinic hydrazone and acetophenone nicotinic hydrazone at 2 mM optimum concentration are 96.5% and 87.7% respectively.

Effects of Alchornea cordifolia leaf extract on the mechanical properties of mild steel in acidic medium

2021 ◽  
Vol 19 (3) ◽  
pp. 55-62
Author(s):  
E. Oparaku ◽  
E. Osarolube
Keyword(s):  
Mechanical Properties ◽  
Mild Steel ◽  
Sulphuric Acid ◽  
Acidic Medium ◽  
Leaf Extract ◽  
Substantial Improvement ◽  
Sulphuric Acid Solution ◽  
The Third ◽  
Weight Loss Method ◽  
Loss Method

The effect of Alchornea Cordifolia leaf extract on the mechanical properties of mild steel in acidic medium was studied using weight loss method. The first sample was not introduced to any medium. It served as the control1 sample. The second sample was introduced to a medium containing 0.2M Sulphuric acid solution in the absence of the Alchornea Cordifolia leaves extract for 21 days, while the third sample was immersed in a vessel containing 0.2M sulphuric2 acid and 0.5g/L of Alchornea Cordifolia leaves extract as an inhibitor for 21 days. Results obtained showed a substantial improvement on the mechanical properties of mild steel exposed to the medium with the inhibitor. Keywords: Mechanical Properties, Corrosion, Inhibition, Alchornea Cordifolia, Sulphuric acid

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