Abstract
The effect of seven amphiphilic compounds, on steel API 5L X52 corrosion in sulphuric acid 1 M solution was studied by potentiodynamic polarization curves, and electrochemical impedance spectroscopy (EIS). Potentiodynamic polarization curves indicated that these compounds acted mainly as cathodic type inhibitors. The EIS spectrums showed that the mechanism of corrosion inhibition is mainly a faradic process, the spectra were fitted with one electrical equivalent circuit (EEC) using a constant phase element (CPE). Double layer capacitance associated with CPE was also obtained. Langmuir, Temkin, and Henry adsorption isotherm described the experimental findings. This information suggested that organic molecules were adsorbed on active sites on metal surface avoiding contact of corrosive media with steel surface, having adsorbate molecules low molecular interaction between them even with the presence of more amphiphilic molecules on the steel surface as concentration got higher values.
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Abbreviations
- CI:
-
Corrosion inhibitor(s)
- MetTImBr:
-
1-Methyl-3-tetradecylimidazolium bromide
- MetHImBr:
-
1-Methyl-3-hexadecylimidazolium bromide
- TPyBr:
-
N,N-Tetradecylpyridinium bromide
- HPyBr:
-
N,N-hexadecylpyridinium bromide
- DMetEtBAmBr:
-
N,N-Dimethyl-N-ethylbenzylammonium bromide
- MetEtBAmLau:
-
N,N-Dimethyl-N-ethylbenzylammonium laurite
- DMetEtBAmAc:
-
N,N-Dimethyl-N-ethylbenzylammonium acetate
- Δ:
-
Conventional Heating
- MW:
-
Microwaves
- M.P.:
-
Melting Point
- Rp:
-
Polarization resistance
- MW:
-
Microwave
- η:
-
Overpotential
- j :
-
Current density
- j a :
-
Anodic current density
- j c :
-
Cathodic current density
- E corr :
-
Corrosion potential
- j corr :
-
Corrosion current density
- R :
-
Constant of Gases
- T :
-
Absolute Temperature
- bc, ba:
-
Tafel Constants
- C :
-
Concentration
- θ:
-
Coverage degree
- IE:
-
Corrosion inhibition efficiency
- rds:
-
Rate-determining step
- ΔG 0ads :
-
Adsorption free energy
- K ads :
-
Equilibrium constant
- f :
-
Molecular interaction constant
- ECC:
-
Electrical equivalent circuit
- CPE:
-
Constant phase element
- Rs:
-
Solution resistance
- Rct:
-
Charge transfer resistance
- C dl :
-
Capacitance of the double layer
- \( \phi \) :
-
Phase angle
- \( \phi_{\max } \) :
-
Maximum value of phase angle in Bode Plot
- ε0 :
-
Vacuum permittivity
- εr :
-
Relative permittivity of dielectric
- S:
-
Surface of dielectric media
- e:
-
Thickness of dielectric media
- CCPE :
-
Capacitance associated with the CPE
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Acknowledgements
J.-B. Pérez-Navarrete would like to thank Consejo Nacional de Ciencia y Tecnología (CONACYT) for the scholarship awarded to carry out postgraduate studies and to N.V. Likhanova for assistance to carry out experimental work.
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Pérez-Navarrete, JB., Olivares-Xometl, C.O. & Likhanova, N.V. Adsorption and corrosion inhibition of amphiphilic compounds on steel pipeline grade API 5L X52 in sulphuric acid 1 M. J Appl Electrochem 40, 1605–1617 (2010). https://doi.org/10.1007/s10800-010-0146-2
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DOI: https://doi.org/10.1007/s10800-010-0146-2