Inhibitory mechanism of mild steel corrosion in 2M sulphuric acid solution by methylene blue dye
Date
2005
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Ltd
Abstract
Methylene blue dye (MB) was investigated as a corrosion inhibitor for mild steel in 2M sulphuric acid solution using gravimetric and thermometric techniques. The inhibition efficiency of MB increased with concentration and synergistically increased in the presence of the halide additives, namely KCl, KBr and KI. The trend of inhibition efficiency with temperature suggests that inhibitor molecules are physically adsorbed on the corroding metal surface at lower concentration (0.01–0.5mM), and chemically adsorbed at higher concentration (1.0–5.0 mM). These results were further corroborated by kinetic and activation parameters for corrosion and adsorption processes evaluated from experimental data at the temperatures studied. MB was found to obey Langmuir and Frumkin adsorption isotherms in the concentration range investigated
Description
The article contains tables and figures
Keywords
Mild steel, methylene blue, inhibition efficiency, physisorption, chemisorption, adsorption isotherm, Department of Chemistry
Citation
Oguzie, E. E., Onuoha, G. N. & Onuchukwu, A. I. (2005). Inhibitory mechanism of mild steel corrosion in 2M sulphuric acid solution by methylene blue dye. Materials Chemistry and Physics 89(2-3), 305 - 311