Adsorption and inhibitive properties of sildenafil (Viagra) for zinc in hydrochloric acid solution
Abstract
Sildenafil (Viagra) was investigated as corrosion inhibitor for Zn in 1 M HCl solution using chemical and electrochemical methods at 25 °C. Electrochemical results showed that this drug is efficient inhibitor for Zn in HCl and the inhibition efficiency (IE) reached to 91% at 300 ppm. The IE increases with the drug concentration and decreases with increasing temperature. The adsorption of this drug on Zn surface follows Langmuir adsorption isotherm. The polarization plots revealed that Sildenafil acts as a mixed-type inhibitor. The thermodynamic parameters of activation and adsorption were calculated and discussed. The surface morphology of the Zn specimens was evaluated using scanning electron microscope (SEM), energy dispersive X-ray (EDX), atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR) techniques.
- Publication:
-
Results in Physics
- Pub Date:
- 2017
- DOI:
- 10.1016/j.rinp.2017.08.012
- Bibcode:
- 2017ResPh...7.3408F
- Keywords:
-
- Zn;
- Corrosion inhibition;
- HCl;
- SEM;
- EDX;
- AFM;
- FTIR;
- Sildenafil drug