Pyridine–pyrazole compound as inhibitor for steel in 1 M HCl

The influence of 3,5-dimethyl-1 H-pyrazole (P1), pyridine (P2) and 2-(3-methyl-1 H-pyrazol-5-yl) pyridine (P3) on the corrosion inhibition of steel in molar hydrochloric acid solution is studied using weight-loss, potentiodynamic and EIS measurements. Results obtained shows that P3 is the best inhib...

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Bibliographic Details
Published in:Applied surface science 2005-02, Vol.240 (1), p.341-348
Main Authors: Bouklah, M., Attayibat, A., Hammouti, B., Ramdani, A., Radi, S., Benkaddour, M.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion prevention
Exact sciences and technology
Hydrochloric acid
Inhibition
Metals. Metallurgy
Pyridine–pyrazole
Steel
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Summary:The influence of 3,5-dimethyl-1 H-pyrazole (P1), pyridine (P2) and 2-(3-methyl-1 H-pyrazol-5-yl) pyridine (P3) on the corrosion inhibition of steel in molar hydrochloric acid solution is studied using weight-loss, potentiodynamic and EIS measurements. Results obtained shows that P3 is the best inhibitor and its inhibition efficiency increases with the increase of concentration to attain 89% since 10 −3 M. Potentiodynamic polarisation studies clearly reveal that it acts essentially as a cathodic inhibitor. The inhibitor studied reduces the corrosion rates. E (%) values obtained from various methods used are in good agreement. Adsorption of P3 on steel surface has an S-shaped adsorption isotherm.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2004.07.001