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authors |
Galio, AF; Lamaka, SV; Zheludkevich, ML; Dick, LFP; Muller, IL; Ferreira, MGS |
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nationality |
International |
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journal |
SURFACE & COATINGS TECHNOLOGY |
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author keywords |
Hybrid sol-gel; 8-Hydroxyquinoline; Corrosion inhibitor; Magnesium alloy; Impedance spectroscopy; SVET |
|
keywords |
HYBRID COATINGS; THIN-FILM; MG ALLOY; PERFORMANCE; BEHAVIOR; STEEL |
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abstract |
This work presents new anticorrosive coatings for the AZ31 magnesium alloy, based on hybrid sol-gel films doped with a corrosion inhibitor. The sol-gel coatings were prepared by copolymerization of 3-glycidoxypropyltrimethoxysilane and zirconium (IV) tetrapropoxide. 8-Hydroxyquinoline (8-HQ) was chosen as a corrosion inhibitor to be incorporated into the sol-gel films at two different stages of synthesis, either before or after hydrolysis of the sol-gel precursors. The effectiveness of 8-HQ for corrosion suppression on AZ31 was verified by Scanning Vibrating Electrode Technique. Electrochemical Impedance Spectroscopy was used to monitor the evolution of the substrate/film systems in the course of immersion in 0.005 M NaCl. The morphology and the structure of the sol-gel films were characterized with SEM/EDS and TEM techniques. The sol-gel films exhibit good adhesion to the metal substrate and prevent the corrosive attack during 2 weeks under immersion test. Results showed that addition of inhibitor into the sol-gel films enhances the corrosion protection of the magnesium alloy and does not lead to deterioration of the barrier properties of the sol-gel matrix. (C) 2009 Elsevier B.V. All rights reserved. |
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publisher |
ELSEVIER SCIENCE SA |
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issn |
0257-8972 |
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year published |
2010 |
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volume |
204 |
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issue |
9-10 |
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beginning page |
1479 |
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ending page |
1486 |
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digital object identifier (doi) |
10.1016/j.surfcoat.2009.09.067 |
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web of science category |
Materials Science, Coatings & Films; Physics, Applied |
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subject category |
Materials Science; Physics |
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unique article identifier |
WOS:000274495700023
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