Adsorption and inhibitive performance of 3-methylquinoxaline-2(1H)-thione against mild steel corrosion in phosphoric acid solution

• Published in: Euro-Mediterranean journal for environmental integration Vol. 3; no. 1; p. 2
• Main Authors: Benbouya, K., Dkhireche, N., Rochdi, A., Chebab, A., Touir, R., Ebn Touhami, M., El Bakri, M., Sfaira, M.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.11.2018; Springer Nature B.V
• Subjects: Acids; Adsorption; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Corrosion; Corrosion inhibitors; Corrosion potential; Corrosion products; Earth and Environmental Science; Earth Sciences; Efficiency; Electrochemistry; Electrodes; Electrolytes; Environmental Chemistry; Environmental Management; Environmental Science and Engineering; High temperature; Hydrocarbons; Low carbon steels; Molecular structure; Original Paper; Phosphoric acid; Spectrum analysis; Steel; Sulfur; Waste Management/Waste Technology; Waste Water Technology; Water Management; Water Pollution Control; Quinoxaline derivative; Phosphoric acid; Electrochemical techniques; Mild steel; Corrosion inhibition
• ISSN: 2365-6433; 2365-7448
• DOI: 10.1007/s41207-017-0042-9

Inhibitive performance of 3-methylquinoxaline-2 (1H) -thione denoted (MQ = S) on mild steel corrosion in 1.0 M H 3 PO 4 was investigated using electrochemical measurements. It is revealed that this product acts as an excellent corrosion inhibitor for mild steel in 1.0 M H 3 PO 4 where its inhibition reaches 93% at 5 × 10 −4 M and increases with immersion time. Potentiodynamic polarization curves indicated that this compound acts as a mixed-type inhibitor. In addition, the MQ = S has its inhibition at high temperature. It was found that the adsorption of this compound obeyed the Langmuir adsorption isotherm.