Open AccessStudy of the Behavior of Sodium Diclofenac Expired Drug as an Corrosion Inhibitor of Iron in Sulfuric Acid Using UV-VIS Spectrophotometry
Author(s) -
Aisha A. Al-Abbassi,
Gehan Taher,
Emdallah Matrood,
Abdulrahman Dnkm,
Akram Sallh,
Raga Izrik,
Muath Suliman
Publication year - 2020
Publication title -
international journal of scientific research in science, engineering and technology
Language(s) - English
Resource type - Journals
eISSN - 2395-1990
pISSN - 2394-4099
DOI - 10.32628/ijsrset207248
Subject(s) - chemistry , sulfuric acid , corrosion inhibitor , endothermic process , absorbance , diclofenac sodium , adsorption , inorganic chemistry , langmuir adsorption model , corrosion , nuclear chemistry , chromatography , organic chemistry
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.