Synergistic inhibition effect of 2-mercaptobenzothiazole and Tween-80 on the corrosion of brass in NaCl solution
| Autor: | Karpagavalli Ramji, Darran R. Cairns, S. Rajeswari |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Sodium
Inorganic chemistry General Physics and Astronomy Langmuir adsorption model chemistry.chemical_element Surfaces and Interfaces General Chemistry Condensed Matter Physics Polyvinyl alcohol Surfaces Coatings and Films Corrosion Brass symbols.namesake chemistry.chemical_compound Adsorption X-ray photoelectron spectroscopy chemistry visual_art symbols visual_art.visual_art_medium Inductively coupled plasma |
| Zdroj: | Applied Surface Science. 254:4483-4493 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2008.01.031 |
| Popis: | The corrosion inhibition of brass in 0.2 M NaCl in the presence of 2-mercaptobenzothiazole (MBT) and polyoxyethylene sorbitan monooleate (Tween-80) has been investigated using potentiodynamic polarization, X-ray photoelectron spectroscopy and inductively coupled plasma analysis. Analysis of the results revealed that the addition of MBT and Tween-80 inhibits the corrosion of brass in 0.2 M NaCl. Potentiodynamic polarization measurements showed that MBT acts as a mixed-type inhibitor and Tween-80 as an anodic inhibitor. Corrosion inhibition occurs through adsorption of the inhibitor on brass surface without modifying the corrosion mechanism. The adsorption of MBT and Tween-80 both follow Langmuir adsorption isotherm. Potentiodynamic polarization results suggested that the mixture of MBT and Tween-80 acts as a mixed-type inhibitor. Inhibition efficiency of 79.0 and 62.5% were obtained in the presence of optimum concentration of MBT and Tween-80, respectively. The addition of the mixture of MBT and Tween-80 enhanced the inhibition efficiency to 94.0% and showed a synergism of inhibition. XPS analysis indicated that MBT adsorbed on brass surface along with Tween-80 in the presence of the mixture of MBT and Tween-80. The results of solution analysis using ICP showed that the mixture of MBT and Tween-80 effectively controlled the dezincification of brass. |
| Databáze: | OpenAIRE |
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