Inhibition of three kinds of expired nitroimidazole antibiotics
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 4 July 2018
Issue publication date: 24 July 2018
Abstract
Purpose
This paper aims to evaluate the efficiency and mechanism of three kinds of expired nitroimidazole antibiotics as corrosion inhibitor for mild steel in 1M HCl.
Design/methodology/approach
Evaluation was carried out by weight loss and electrochemical techniques. The surface morphology and the composition of the elements of adsorption layer are studied by scanning electron microscopy and energy dispersive spectrometer.
Findings
The experimental results reveal that the maximum value of inhibition efficiency appear at an extreme point of concentration with the increase of concentration of the inhibitors. Ornidazole has better corrosion inhibition than metronidazole but not as tinidazole. The inhibitors all act as cathodic type corrosion inhibitor. The adsorption of ornidazole, metronidazole and tinidazole on mild steel obeys Langmuir adsorption isotherm and belongs to chemisorption of electron donating. Combined with the molecular structure of the corrosion inhibitor and the experimental structure, the authors propose a detailed mechanism analysis.
Originality/value
The expired nitroimidazole antibiotics as corrosion inhibitor for mild steel in hydrochloric acid solution is first studied. It provides a way to deal with expired drugs, thereby reducing environmental pollution. The study explored the inhibition mechanism affecting by comparison different structure of three kinds of expired nitroimidazole antibiotics molecular, providing theoretical support for the preparation of the new inhibitor.
Keywords
Citation
Shi, Y., Bai, W., Guo, J., Gao, L., Chen, Y., Wu, Y. and Liang, L. (2018), "Inhibition of three kinds of expired nitroimidazole antibiotics", Anti-Corrosion Methods and Materials, Vol. 65 No. 4, pp. 398-407. https://doi.org/10.1108/ACMM-02-2018-1897
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited