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.

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.

scholarly journals Synthesis of Bimannich Base with Thiazole and Its Corrosion Inhibition Effect on H2S and CO2 at High Temperature

2021 ◽  
Author(s):  
Zhuoke Li ◽  
Jun Cao ◽  
Ting Mao ◽  
Dan Ni
Keyword(s):  
Weight Loss ◽  
Free Energy ◽  
Corrosion Inhibition ◽  
Surface Coverage ◽  
Mannich Base ◽  
Synthesis Method ◽  
Langmuir Adsorption Isotherm ◽  
Liquid Environment ◽  
Inhibition Effect ◽  
Langmuir Adsorption

Abstract A bimannich base TZBM containing a thiazole structure was obtained by the mannich base synthesis method. TZBM can maintain a stable structure at 260°C, and has a good corrosion inhibition effect on carbon steel in a gas-liquid environment containing Cl−+H2S + CO2 at 180°C. Through the weight loss test of steel under different concentrations of TZBM, the degree of surface coverage of the adsorbed inhibitor is determined, and it was found that the results obey the Langmuir adsorption isotherm. And the negative Gibbs free energy indicates that the adsorption is spontaneous.

scholarly journals Inhibitive Effect of Costus afer Extracts on Mild Steel Corrosion in Acidic Medium

2016 ◽  
Vol 7 ◽  
pp. 60-67
Author(s):  
Lebe A. Nnanna ◽  
Wisdom O. John ◽  
Tochukwu E. Esihe ◽  
Kelechi C. Denkoro ◽  
Victor I. Okparaku ◽  
...  
Keyword(s):  
Mild Steel ◽  
Room Temperature ◽  
Inhibition Efficiency ◽  
Gravimetric Method ◽  
Steel Corrosion ◽  
Corrosion Process ◽  
Inhibition Effect ◽  
A Value ◽  
Mild Steel Corrosion ◽  
Costus Afer

Inhibition effect of Costusafer on mild steel in 0.5 M HCl was studied using gravimetric method at room temperature. It was found out that Costusafer inhibited the corrosion of mild steel in the acidic environment and that the efficiency of inhibition increased as the concentration of the inhibitor in the environment increased. The data was used to test different isotherms and it suited the Langmuir isotherm. A value of -15.995 kJmol-1 was gotten for the ∆Goads. This value showed that the extracts of Costusafer inhibited the corrosion process through physiosorption mechanism. The high value of inhibition efficiency of the extract as the concentration increased in rationalized in terms of the increase in herteroatoms, saponnins and tannins which are present in the extract.

scholarly journals A thermometric study on the kinetics of the acid dissolution of aluminium in the presence of Napoleonaea imperialis seeds extract and iodide ions

2018 ◽  
Vol 29 (2) ◽  
pp. 103-109 ◽  
Author(s):  
Habibat Faith Chahul ◽  
Gloria Ihuoma Ndukwe ◽  
David Ogwu Ogwu
Keyword(s):  
Free Energy ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Langmuir Adsorption Isotherm ◽  
Seed Extract ◽  
Considerable Extent ◽  
Acid Dissolution ◽  
Iodide Ions ◽  
Langmuir Adsorption ◽  
Kinetics Of

Abstract The dissolution of aluminum alloy AA 1060 in 0.5 M and 1.0 M HCl was investigated using thermometric measurements. The reaction number of the aluminum coupons varied linearly with the concentration of the acid. Addition of Napoleonaea imperialis seed extract to the dissolving aluminium coupons lowered the reaction number in both concentrations of HCl by inhibiting the dissolution process. The inhibition efficiency of Napoleonaea imperialis seed extract was enhanced to a considerable extent in the presence of iodide ions with the synergistic parameter S > 1. The adsorption of Napoleonaea imperialis extract on the aluminium surface best aligned with the Langmuir adsorption isotherm model. The values of the free energy, ΔGadsfor the adsorption process revealed the process to be spontaneous and physisorptive.

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

Adsorption Behavior and Corrosion Inhibition of EPP for Q235 Steel in H2SO4 Solution

2011 ◽  
Vol 287-290 ◽  
pp. 2923-2926 ◽  
Author(s):  
Li Ke Zou ◽  
Chuan Lai ◽  
Bin Xie ◽  
Xue Yang ◽  
Zhen Xiang ◽  
...  
Keyword(s):  
Immersion Time ◽  
Mixed Type ◽  
Langmuir Adsorption Isotherm ◽  
Weight Loss Measurement ◽  
Q235 Steel ◽  
Inhibition Effect ◽  
Langmuir Adsorption ◽  
Effects Of Temperature ◽  
Cathodic And Anodic Processes ◽  
Mixed Type Inhibitor

The inhibition effect of N,N-diethylammonium O,O'-di(2-phenylethyl)dithiophosphate (EPP, [NH2(Et)2][S2P(OCH2CH2Ph)2]2) against the corrosion of Q235 steel in H2SO4solution was studied by weight loss measurement, potentiodynamic polarization and SEM(scanning electron microscope) techniques. The results show that EPP acts as an excellent corrosion inhibitor in 5% H2SO4by suppressing simultaneously the cathodic and anodic processes via chemical adsorption on Q235 steel surface, which complies with the Langmuir adsorption isotherm. Polarization curves indicate EPP is a mixed-type inhibitor. The effects of temperature, acid concentration and immersion time were also studied.

scholarly journals A STUDY OF THE CORROSION INHIBITION OF CARBON STEEL IN AMMONIACAL MEDIA DILUTED BY N-CYCLOHEXYL BENZOTHIAZOLE SULPHEN AMIDE

2003 ◽  
Vol 11 (12) ◽  
pp. 13-20
Author(s):  
Mircea Preda ◽  
Adriana Samide ◽  
Olimpia Rusu ◽  
Paul Chirita ◽  
Nicoleta Cioatera
Keyword(s):  
Experimental Data ◽  
Free Energy ◽  
Carbon Steel ◽  
Adsorption Isotherm ◽  
Corrosion Inhibition ◽  
Chemical Structure ◽  
Type Equation ◽  
Ammoniacal Solution ◽  
Inhibition Effect ◽  
Free Energy Of Activation

The inhibition effect of N-cyclohexyl benzothiazole sulphen amide (NCBSA) was studied on the corrosion of carbon steel in diluted ammoniacal solution at temperatures of 25°C and 30°C. The effects of the inhibitor on the corrosion were investigated and determined by using electrochemical measurements (curves of intensity - voltage). The efficiency of NCBSA increased with an increase in concentration but decreased with an increase in temperature. The free energy of activation was determined from the Arrhenius type equation. Experimental data fitted on adsorption isotherm of Langmuir type, while the results Were correlated to the chemical structure of the inhibitor.

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.

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