Inhibition effects of a new syntheses pyrazole deri
vative on the corrosion of 
mild steel in sulfuric acid solution

S. EL Arouji
1; K. Alaoui Ismaili
1; A. Zerrouki
2; S. El Kadiri
2; Z. Rais
1; M. Filali  Baba
1; M. 
Taleb
1; Khadijah M. Emran
3; A. Zarrouk
2; A. Aouniti
2; B. Hammouti
2

Abstract

Inhibition effects of a new syntheses pyrazole deri vative on the corrosion of mild steel in sulfuric acid solution

Author(s): S. EL Arouji 1 , K. Alaoui Ismaili 1 , A. Zerrouki 2 , S. El Kadiri 2 , Z. Rais 1 , M. Filali Baba 1 , M. Taleb 1 , Khadijah M. Emran 3 , A. Zarrouk 2 , A. Aouniti 2 and B. Hammouti 2

The corrosion inhibition of mild steel in 0.5 M H 2 SO 4 in the presence of N 1 ,N 1 -bis(2-(bis((3,5-dimethyl-1H-pyrazol- 1-yl)methyl)amino)ethyl)-N 2 ,N 2 -bis((3,5-dimethyl-1H-pyrazol-1- yl)methyl)ethane-1 ,2-diamine (PAP) has been studied by electrochemical techniques (DC polarizat ion and AC impedance) and weight loss measurement. Result obtained reveal that this pyrazole derivative is go od inhibitor for mild steel in 0.5 M H 2 SO 4 . Tafel polarization studies clearly reveal the type of inhibitor. This pyrazole derivative acts on cathodic and anodic rea ctions and reduces corrosion current density. Changes in imped ance parameters (R ct and C dl ) are indicative of adsorption of the pyrazole derivative on the metal surface leadin g to formation of protective film which grows with increasing concentration and inhibition efficiency values incr ease. The effect of temperature on the corrosion be havior of mild steel with the addition of the pyrazole derivative was studied in the temperature range from 303 to 33 3 K. Thermodynamic parameters for adsorption and activat ion processes were determined. Adsorption of this i nhibitor follows the Langmuir adsorption isotherm.

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