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 A Comparative Study of the Corrosion Inhibitive Properties of Pyrimidine Derivatives for Mild Steel

2009 ◽  
Vol 6 (s1) ◽  
pp. S65-S74 ◽  
Author(s):  
P. Sathya ◽  
K. Parameswari ◽  
S. Chitra ◽  
A. Selvaraj
Keyword(s):  
Weight Loss ◽  
Mild Steel ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Electrochemical Techniques ◽  
Pyrimidine Derivatives ◽  
Langmuir Adsorption ◽  
Increase With Increase ◽  
Inhibition Concentration ◽  
Efficiency Increase

The influence of pyrimidine derivatives on the corrosion inhibition of mild steel in 1 M H2SO4was studied using weight loss and electrochemical techniques. These compounds act as good corrosion inhibitors even at low concentration and the inhibition efficiency increased with the increase in inhibition concentration. The corrosion rates have been determined at various temperatures (303-333K) by weight loss measurements. The Rtvalues obtained from EIS method increased with increase in inhibitor concentration. The potentiostatic polarization results clearly revealed that the inhibitors behave as a mixed type but slightly anodic in nature. The adsorption process was found to obey the Langmuir adsorption isotherm. The synergistic effect of halide ion on the inhibition efficiency increase with increase concentration.

INVESTIGATION OF ADSORPTION AND INHIBITIVE EFFECT OF CALIXARENE DERIVATIVE NEWLY SYNTHESIZED TOWARDS C38 STEEL IN MOLAR HCl

2009 ◽  
Vol 16 (03) ◽  
pp. 401-406 ◽  
Author(s):  
R. SOUANE ◽  
M. KADDOURI ◽  
M. BOUKLAH ◽  
N. CHERIAA ◽  
B. HAMMOUTI ◽  
...  
Keyword(s):  
Weight Loss ◽  
Inhibition Efficiency ◽  
Langmuir Adsorption Isotherm ◽  
Enthalpy Of Adsorption ◽  
Langmuir Adsorption ◽  
Corrosion Phenomenon ◽  
Calixarene Derivative ◽  
Current Densities ◽  
C38 Steel ◽  
Mixed Type Inhibitor

The focus of this study is to synthesize a new calixarene derivative namely calix[6]arene (C21) and to test its performance as corrosion inhibitor of C38 steel in molar HCl at 308 K. Polarization and weight loss measurements were used. Weight loss tests show that C21 retards until to stop corrosion phenomenon at 5 × 10-5 M . C21 is an excellent inhibitor and its inhibition efficiency increases with its concentration to reach 100% since 5 × 10-5 M . Polarization curves revealed that C21 affects both cathodic and anodic domains by decreasing current densities and then it may be classified as a mixed type inhibitor. The calixarene tested is adsorbed on the surface according to the Langmuir adsorption isotherm. Free enthalpy of adsorption reveals that C21 acts from chemisorption onto the steel surface.

scholarly journals Surface Protection of Steel by Adsorption of Milletia Pinnata Extract

2016 ◽  
Vol 13 (2) ◽  
pp. 101-105
Author(s):  
Monikandon Sukumaran ◽  
Kesavan Devarayan
Keyword(s):  
Weight Loss ◽  
Steel Surface ◽  
Inhibition Efficiency ◽  
Physical Adsorption ◽  
Ethanolic Extract ◽  
Steel Corrosion ◽  
Langmuir Adsorption Isotherm ◽  
Surface Protection ◽  
Langmuir Adsorption ◽  
Thermochemical Parameters

Steel corrosion inhibition in acidic and alkaline medium by ethanolic extract of Milletia pinnata is described in this study. The inhibitive behavior of the inhibitor is evaluated by weight loss measurements, adsorption isotherms, and thermochemical parameters. The inhibitor exhibited a maximum of 87% and 90.5% inhibition efficiency against steel corrosion in 0.5 M NaOH and 1.0 M H2SO4, respectively. The weight loss linearly fit to Langmuir adsorption isotherm with correlation coefficient value close to unity. The thermochemical parameters indicated for predominant physical adsorption of the inhibitor molecules on the steel surface.

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.

scholarly journals The Inhibition Effect of Potassium Iodide on the Corrosion of Pure Iron in Sulphuric Acid

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Tarik Attar ◽  
Lahcène Larabi ◽  
Yahia Harek
Keyword(s):  
Activation Energy ◽  
Weight Loss ◽  
Organic Compounds ◽  
Potassium Iodide ◽  
Pure Iron ◽  
Inhibition Efficiency ◽  
Langmuir Adsorption Isotherm ◽  
Inhibitor Concentration ◽  
Inhibition Effect ◽  
Langmuir Adsorption

The use of inorganic inhibitors as an alternative to organic compounds is based on the possibility of degradation of organic compounds with time and temperature. The inhibition effect of potassium iodide on the corrosion of pure iron in 0.5 M H2SO4 has been studied by weight loss. It has been observed from the results that the inhibition efficiency (IE%) of KI increases from 82.17% to 97.51% with the increase in inhibitor concentration from 1·10−4 to 2·10−3 M. The apparent activation energy (Ea) and the equilibrium constant of adsorption (Kads) were calculated. The adsorption of the inhibitor on the pure iron surface is in agreement with Langmuir adsorption isotherm.

scholarly journals Corrosion and Inhibitor on Material: Experimental and Computational Calculations

2020 ◽  
Vol 9 (4) ◽  
pp. 1373-1383
Keyword(s):  
Corrosion Rate ◽  
Mild Steel ◽  
Steel Surface ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Protonated Form ◽  
Mild Steel Surface ◽  
Langmuir Adsorption ◽  
Computational Calculations ◽  
Comprehensive Study

In this paper, we provide a comprehensive study of corrosion inhibition of mild steel in 1 M HCl solution at 313, 323, and 333 K using 4,4-Dimethyl oxazolidine-2-thione (DMOT) and its protonated form (DMOTH+ ) as inhibitors. Our results show that the corrosion rate of mild steel in 1 M HCl increases as the temperature increases while it decreases as the DMOT concentration increases. In contrast to the corrosion rate, the DMOT inhibition efficiency decreases with temperature and increases with increasing DMOT concentration. Both experimental and quantum chemical computational results reveal that the adsorption of DMOT and DMOTH+ on the mild steel surface is a mixed-type process having both physisorption and chemisorption. Moreover, the inhibitor adsorption on the mild steel surface was found to obey the Langmuir adsorption isotherm and the value of Gibbs energy of adsorption at the three studied temperatures is associated with an adsorption mechanism involving both physisorption and chemisorption processes. Heavy corrosion, cavities, and pitting of surfaces were observed in the absence of DMOT inhibitor, while much less corrosion was consistently observed in the presence of DMOT inhibitor

SELECTED BIS-THIADIAZOLE: SYNTHESIS AND CORROSION INHIBITION STUDIES ON MILD STEEL IN HCL ENVIRONMENT

2020 ◽  
Vol 27 (12) ◽  
pp. 2050014
Author(s):  
ABBAS Z. SALMAN ◽  
QUSAY A. JAWAD ◽  
KHALID S. RIDAH ◽  
LINA M. SHAKER ◽  
AHMED A. AL-AMIERY
Keyword(s):  
Mild Steel ◽  
Immersion Time ◽  
Inhibition Efficiency ◽  
Langmuir Adsorption Isotherm ◽  
Inhibitor Concentration ◽  
Conjugation System ◽  
Inhibition Effect ◽  
Langmuir Adsorption ◽  
Acid Environment ◽  
Inhibition Studies

The inhibition effect of synthesized corrosion inhibitor namely 5,5′-(1,4-phenylene)bis([Formula: see text]-phenyl-1,3,4-thiadiazol-2-amine) (PBPA) on the corrosion of mild steel in 1-M hydrochloric acid environment are examined by gravimetric techniques at various temperature (303–343 K). The synthesized inhibitor concentrations are 0.1–0.5[Formula: see text]mM. The inhibition efficiency increased with the increase of the inhibitor concentration. The inhibition efficiency reached 94% at the highest studied concentration of 0.5[Formula: see text]mM for 5[Formula: see text]h of immersion time and 303[Formula: see text]K. Moreover, the inhibition efficiency decreased with the temperature increase. The adsorption of tested inhibitor molecules on the surface of mild steel follows the Langmuir adsorption isotherm. The studied inhibitor molecules showed excellent inhibition since PBPA molecules have nitrogen and sulfur atoms in addition to phenyl and thiadiazol rings which were linked together in conjugation system.

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.

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