期刊
MEASUREMENT
卷 76, 期 -, 页码 104-116出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2015.08.029
关键词
Aluminum; Electrochemical impedance spectroscopy; Corrosion; Poly (methacrylic acid); Scanning electron microscopy; Synergism
资金
- TWAS, the Academy of Sciences for the Developing World, under the TWAS Grants for Research Units in Developing Countries Program [10-107RG/CHE/AF/AC-G]
The corrosion inhibition of Al in 0.5 M H2SO4 solution by poly (methacrylic acid) (PMAA) alone and in combination with iodide ions was studied at 303-333 K using gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization, scanning electron microscopy and water contact angle measurements techniques. Results obtained show that PMAA moderately inhibited the dissolution of Al in the corrosive medium. Addition of Iodide ions synergistically upgrades the inhibition efficiency of PMAA to a maximum value of 82.6%. From polarization results, PMAA and PMAA + KI can be classified as mixed-type corrosion inhibitor. Thermodynamic parameters namely Gibbs free energy of adsorption, activation energy and enthalpy of activation revealed that the adsorption processes of PMAA and PMAA + KI are endothermic reactions mainly by a physisorption mechanism and followed El-Awady et al. thermodynamic-kinetic adsorption isotherm. (C) 2015 Elsevier Ltd. All rights reserved.
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