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Electrochemical and Theoretical Study of Pyrazole 4-(4,5dihydro- 1H-pyrazol-5-yl)-N,N-dimethylaniline (D) as a Corrosion Inhibitor for Mild Steel in 1 M HCl
- Source :
- Portugaliae Electrochimica Acta v.35 n.2 2017, Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos), Agência para a Sociedade do Conhecimento (UMIC)-FCT-Sociedade da Informação, instacron:RCAAP, Portugaliae Electrochimica Acta, Volume: 35, Issue: 2, Pages: 65-80, Published: MAR 2017
- Publication Year :
- 2017
- Publisher :
- Sociedade Portuguesa de Electroquímica, 2017.
-
Abstract
- This work is devoted to examine the effectiveness of pyrazoles 4-(4,5-dihydro-1Hpyrazol- 5-yl)-N,N-dimethylaniline (D) on corrosion of mild steel in a 1 M HCl solution, using weight loss measurement at concentration effects. The inhibitor (D) was synthesized in our laboratory. The formation of this pyrazole was carried out with hydrazine and α-unsaturated aldehydes, and the structure was checked by spectroscopic means, such as FT-IR, 1H NMR and 13C NMR. Polarization curves and electrochemical impedance spectroscopy (EIS) methods were used to assess both the corrosion rate and inhibition efficiency. Potentiodynamic polarization showed that D behaved as a mixed-type inhibitor. The Nyquist plots showed that, while D concentrations increased, charge-transfer resistance increased and double-layer capacitance decreased, involving increased inhibition efficiency. Adsorption of the inhibitor molecules corresponds to Langmuir adsorption isotherm. Quantum chemical calculations showed that the inhibitor was prone to be protonated in the acid, and the results were in full agreement with experimental observations.
- Subjects :
- 010405 organic chemistry
Metallurgy
Dimethylaniline
02 engineering and technology
electrochemical
Pyrazole
corrosion inhibition
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
hydrazine
NMR
mild steel
0104 chemical sciences
chemistry.chemical_compound
Corrosion inhibitor
chemistry
weight loss
DFT method
0210 nano-technology
Nuclear chemistry
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Portugaliae Electrochimica Acta v.35 n.2 2017, Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos), Agência para a Sociedade do Conhecimento (UMIC)-FCT-Sociedade da Informação, instacron:RCAAP, Portugaliae Electrochimica Acta, Volume: 35, Issue: 2, Pages: 65-80, Published: MAR 2017
- Accession number :
- edsair.doi.dedup.....679ad48fe91554eb803b0e294ee5e0e3