الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 191 |  |  |
| | | from | 191 | | |
Abstract
The present work is assigned to study the corrosion behaviour of steel in 1 M hydrochloric acid solution and the inhibiting effect of some pharmaceutical compounds. The obtained results showed that the inhibition efficiency of these compounds increased by increasing their concentration, so that the adsorption of these compounds is physical and the adsorption of the organic compounds on steel surface in 1 M hydrochloric acid follows Langmuir adsorption isotherm. Potentiodynamic polarization technique was used as a second method to study the inhibiting effect of the used extracts. from these results it was found that these extracts act as mixed type inhibitors. Also, impedance spectroscopy measurements and electrochemical frequency modulation measurements were used. Some thermodynamic parameters are computed and discussed. Also, electrochemical frequency modulation measurements. The obtained results of all methods are in good agreement.