Study of the Behavior of Sodium Diclofenac Expired Drug as an Corrosion Inhibitor of Iron in Sulfuric Acid Using UV-VIS Spectrophotometry

Abstract

The effect of Sodium Diclofenac (SD) as an inhibitor of pure iron corrosion in a 1.0 N of sulfuric acid was studied spectrally using a UV-VIS at different temperatures of 343.15, 323.15, 303.15 K. The concentration of dissolved iron was determined spectrally using phenanthroline method. The absorbance of each solution was measured at different times, and the data obtained were used to calculate the corrosion rate, which was found to be a zero-order reaction in the presence and absence of the SD inhibitor. The absorbance was decreased with an increase in inhibitor concentration and an increase in temperature. However, the inhibition efficiency was increased with inhibitor concentration an increase. The inhibitor is adsorbed on the surface of the iron particles according to the Langmuir and Kinetic-thermodynamic model of adsorption isotherm. The results indicated that the reaction is endothermic and unspontaneous. Quantum chemical parameters such as the highest & lowest occupied molecular orbital energy (EHOMO) & (ELUMO), energy gap (ΔE), were calculated and correlated to the experimental data.

Corrosion Inhibition of Mild Steel in Acidic Media by Expired Carbimazole Drug

“…Thus, expired drugs which are of no use can be investigated as corrosion inhibition. So drugs represent a promising class of inhibitors [11][12][13]. In light of the above observation, we aimed to investigate the inhibition characteristics of expired drug namely JOPAS Vol.20 No.…”