Antibacterial inhibitor as an expired metoclopramide in 0.5M phosphoric acid

• Published in: Ai-Khawarizmi engineering journal Vol. 15; no. 1; pp. 71 - 81
• Main Authors: Kazim, Mustafa Muhammad, Nasir, Shayma Ala, Abd al-Majid, Majid Hamid, Anai, Rana Afif Majid, Ahmad, Umar Akram
• Format: Journal Article
• Language: English
• Published: Baghdad, Iraq University of Baghdad, al-Khwarizmi College of Engineering 01-03-2019; Al-Khwarizmi College of Engineering – University of Baghdad
• Subjects: Antibacterial test; Carbon steel; Expired Metoclopramide; Phosphoric acid; المثبطات; الميتوكلوبراميد; حمض الفوسفوريك
• ISSN: 1818-1171; 2312-0789
• DOI: 10.22153/kej.2019.08.002

Expired drug Metoclopramide was investigated as an antibacterial corrosion inhibitor for carbon steel in 0.5M H3PO4
solution using the electrochemical method at 30oC and 60oC. The results showed that this drug is an efficient inhibitor for
carbon steel and the efficiency reached to 82.244 % for 175 ppm at 30oC and 76.146% for 225 ppm at 60oC. The adsorption
of drug on carbon steel surface follows Langmuir adsorption isotherm with small values of adsorption-desorption constant.
The polarization plots revealed that Metoclopramide acts as mixed-type inhibitor. Some parameters of inhibition process
were calculated and discussed. The surface morphology of the carbon steel specimens was analyzed using scanning
electron microscope and energy dispersive X-ray analysis. Antibacterial activity of inhibitor was also tested. Fouriertransform
infrared (FTIR) spectroscopy confirmed the inhibitive role of Metoclopramide drug.