scholarly journals The Effect of Ionic Liquids on the Corrosion Inhibition of Copper in Acidic Chloride Solutions

2011 ◽  
Vol 2011 ◽  
pp. 1-13 ◽  
Author(s):  
M. Scendo ◽  
J. Uznanska
Keyword(s):  
Ionic Liquids ◽  
Corrosion Inhibition ◽  
Quartz Crystal ◽  
Inhibition Efficiency ◽  
Standard Free Energy ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Copper Surface ◽  
Free Energy Of Adsorption ◽  
Acidic Chloride ◽  
Mixed Type Inhibitor

The influence of the concentration of the 1-Butyl-3-methylimidazolium chloride (BMIMCl) and 1-Butyl-3-methylimidazolium bromide (BMIMBr) as ionic liquids (ILs) on the corrosion inhibition of copper in 1.0 M Cl−solutions of pH 1.0 was studied. The investigation involved electrochemical polarization methods as well as electrochemical quartz crystal microbalance (EQCM) technique and scanning electron microscopy (SEM). The inhibition efficiency increases with an increase in the concentration of BMIMCl and BMIMBr. Adherent layers of inhibitors were postulated to account for the protective effect. Both of the compounds act as a mixed-type inhibitor. The values of standard free energy of adsorption suggest the chemical adsorption BMIMCl and BMIMBr on the copper surface.

[Omim][Pro] Amino Acid Ionic Liquids as a Corrosion Inhibitor for Copper in 3.5 % NaCl Solution

2014 ◽  
Vol 496-500 ◽  
pp. 47-50
Author(s):  
Xue Dan Chen ◽  
Min Gong ◽  
Qing Shan Fu ◽  
Xing Wen Zheng ◽  
Xue Song Feng
Keyword(s):  
Ionic Liquids ◽  
Amino Acid ◽  
Corrosion Inhibition ◽  
Mixed Type ◽  
Inhibition Efficiency ◽  
Nacl Solution ◽  
Inhibition Effect ◽  
Inhibition Performance ◽  
Increasing Temperature ◽  
Mixed Type Inhibitor

The corrosion inhibition effect of the 1-alkyl-3-methylimidazolium proline ([Omi [Pro]) for copper in 3.5% NaCl solution was investigated by using electrochemical methods. The results indicated that: the inhibition efficiency of [Omi [Pro] was more than 90%, which showed the excellent corrosion inhibition performance. The inhibition efficiency increased with increasing concentration of [Omi [Pro], and decreased with increasing temperature, but it changed very little when the concentration arrived at 0.001 mol/L. [Omi [Pro] was a good mixed-type inhibitor which mainly inhibited anodic processes.

Experimental and theoretical studies of 4,6-diamino-2-mercaptopyrimidine as a copper inhibitor in 3.5 wt% NaCl solution

RSC Advances ◽  
2016 ◽  
Vol 6 (18) ◽  
pp. 15210-15219 ◽  
Author(s):  
Zhi Cheng ◽  
Shi Mo ◽  
Jing Jia ◽  
Ji Feng ◽  
Hong Qun Luo ◽  
...  
Keyword(s):  
Corrosion Inhibition ◽  
Inhibition Efficiency ◽  
Copper Surface ◽  
Theoretical Studies ◽  
Nacl Solution ◽  
High Corrosion ◽  
Corrosion Inhibition Efficiency ◽  
Experimental And Theoretical Studies

4,6-Diamino-2-mercaptopyrimidine can be adsorbed on copper surface and exhibits a high corrosion inhibition efficiency in 3.5 wt% NaCl solution.

scholarly journals Corrosion Inhibition Studies of Benzilic Acid-Tyrosine Ligand and their Metal Complexes

2021 ◽  
Vol 9 (VIII) ◽  
pp. 337-343
Author(s):  
N. P. Pranamya
Keyword(s):  
Amino Acid ◽  
Metal Complexes ◽  
Corrosion Inhibition ◽  
Inhibition Efficiency ◽  
Iron Complex ◽  
Maximum Efficiency ◽  
Free Energy Of Adsorption ◽  
Amino Acid Ligand ◽  
Benzilic Acid ◽  
Inhibition Studies

A novel amino acid ligand derived from Benzilic acid and Tyrosine and its Cr (II), Fe (III), Co (II) and Ni (II) transition metal complexes were synthesized. The structure elucidation of the ligand and its complexes were derived on the basis of various spectroscopic methods such as Infrared and electronic spectra along with the aid of CHN, magnetic and conductometric measurements1, 2, 3. The corrosion inhibition efficiency of newly synthesized amino acid-mixed ligand and their metal complexes were studied in 0.5M HCl solution. The results show that the inhibitors exhibits an inhibition efficiency of 40-67% at 200ppm.The ligand shows the maximum efficiency whereas on complexation the efficiency tend to decrease. When the concentration of the inhibitor increases, then the efficiency of the inhibitor will increase4. The adsorption studies reveal that iron complex with the mild steel is chemisorption and the thermodynamic parameters such as adsorption, equilibrium constant (K) and free energy of adsorption (∆Gads) were calculated. The curve of the adsorption fits well with Langmuir adsorption isotherm.

scholarly journals Acid Corrosion Inhibition and Adsorption Behaviour of Ethyl Hydroxyethyl Cellulose on Mild Steel Corrosion

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
I. O. Arukalam ◽  
I. O. Madu ◽  
N. T. Ijomah ◽  
C. M. Ewulonu ◽  
G. N. Onyeagoro
Keyword(s):  
Mild Steel ◽  
Molecular Orbital ◽  
Corrosion Inhibition ◽  
Density Functional ◽  
Inhibition Efficiency ◽  
Acid Corrosion ◽  
Hydroxyethyl Cellulose ◽  
Chemical Calculation ◽  
Free Energy Of Adsorption ◽  
Ethyl Hydroxyethyl Cellulose

The corrosion inhibition of mild steel in 1.0 M H2SO4 solution by ethyl hydroxyethyl cellulose has been studied in relation to the concentration of the additive using weight loss measurement, EIS, polarization, and quantum chemical calculation techniques. The results indicate that EHEC inhibited corrosion reaction in the acid medium and inhibition efficiency increased with EHEC concentration. Further increase in inhibition efficiency is observed in the presence of iodide ions, due to synergistic effect. Impedance results reveal that EHEC is adsorbed on the corroding metal surface. Adsorption followed a modified Langmuir isotherm, with very high negative values of the free energy of adsorption (ΔGads). The polarization data indicate that the inhibitor was of mixed type, with predominant effect on the cathodic partial reaction. The frontier molecular orbitals, HOMO (the highest occupied molecular orbital) and LUMO (the lowest unoccupied molecular orbital) as well as local reactivity of the EHEC molecule, were analyzed theoretically using the density functional theory to explain the adsorption characteristics at a molecular level. The theoretical predictions showed good agreement with experimental results.

scholarly journals An Ecofriendly Initiative for the Corrosion Inhibition of Mild Steel in 1 M HCl Using Tecoma capensis Flower Extract

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
A. Prithiba ◽  
R. Rajalakshmi
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Immersion Time ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Electrochemical Impedance ◽  
Analytical Techniques ◽  
Electrochemical Studies ◽  
Flower Extract ◽  
Mixed Type Inhibitor

Corrosion inhibition of mild steel in 1 M HCl in the presence of Tecoma capensis flower extract was carried out by means of mass loss, potentiodynamic polarisation, and electrochemical impedance techniques. The inhibition efficiency varied with concentration of the inhibitor, immersion time, and temperature. The adsorption of the inhibitor on mild steel surface obeys Langmuir’s adsorption isotherm. Thermodynamic parameters reveal that the adsorption process is spontaneous. Electrochemical studies reflect that the inhibitor acts as a mixed-type inhibitor. Surface analytical techniques ascertain the inhibitive nature of the studied inhibitor.

THE INFLUENCE OF GRAIN SIZE OF PURE IRON METAL ON CORROSION INHIBITION IN PRESENCE OF SODIUM NITRITE

2012 ◽  
Vol 05 ◽  
pp. 793-800 ◽  
Author(s):  
VAHID AFSHARI ◽  
CHANGIZ DEHGHANIAN
Keyword(s):  
Grain Size ◽  
Aqueous Solutions ◽  
Corrosion Inhibition ◽  
Sodium Nitrite ◽  
Active Sites ◽  
Electrochemical Impedance ◽  
Standard Free Energy ◽  
Charge Transfer Resistance ◽  
Free Energy Of Adsorption ◽  
Transfer Resistance

The effects of grain size reduction on the corrosion inhibition of sodium nitrite were investigated using polarization curves and electrochemical impedance spectroscopy (EIS). Nanocrystalline iron (~ 45 nm) was produced by pulse electrodeposition using citric acid bath. The grain size of a nanocrystalline surface was analyzed by X-ray diffractometry (XRD) and field emission scanning electron microscopy (FESEM). The most intensive first-order peak (211) of the XRD patterns was taken for detailed analysis using a Gaussian fitting curve. The tests were carried out in 25 mg / l NaCl + 57 mg / l Na 2 SO 4 with different concentration of sodium nitrite aqueous solutions. The results revealed that due to the adsorption process which leads to the formation of a protective layer with a greater charge transfer resistance the inhibition effect and corrosion protection of sodium nitrite inhibitor in near-neutral aqueous solutions increased as the grain size decreased from microcrystalline to nanocrystalline. The standard free energy of adsorption ( ΔGads ) revealed a strong interaction between inhibitor and nanocrystalline surface. This was attributed to the increased number of the active sites caused by nanocrystalline surface.

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