Abstract
The accumulation of the expired vitamin B6 drugs is hazards for both our child's and environment, the present research aimed to reuse the expired water soluble drug in its pharmaceutical form as potential non-toxic corrosion inhibitor for steel alloys used in manufacturer of the petroleum pipe lines in 1.0 M HCl. Atomic absorption spectroscopy(AAS) and electrochemical techniques were used to evaluate the corrosion inhibition efficiency, effect of concentrations and temperature were studied, the data show that the inhibition efficiency was increased with concentrations and decreased with temperature. Potentiodynamic polarization data show that the expired vitamin B6 retard both anodic and cathodic potential meaning it is a mixed inhibitor. The electrochemical impedance spectroscopy EIS, techniques data shows that the expired drug help to increases the polarization resistance by adsorbing on metal/electrolyte interface. This kind of adsorption found to obeying Langmuir adsorption isotherm model. The data obtained from the used techniques exhibit good agreement between them with (+/- 1) to prove that the used expired vitaminB6 medicinal drugs act as eco-friendly corrosion inhibitor for the steel in acidic environment in its pharmaceutical from.