Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/19669
Title: | Fault-tolerant hybrid epoxy-silane coating for corrosion protection of magnesium alloy AZ31 |
Author: | Lamaka, S. V. Xue, H. S. Meis, N. N. A. H. Esteves, A. C. C. Ferreira, M. G. S. |
Keywords: | SOL-GEL COATINGS ORGANIC COATINGS IONIC CURRENTS SILICA HYBRIDS PH |
Issue Date: | 2015 |
Publisher: | ELSEVIER SCIENCE SA |
Abstract: | In this work, a hybrid epoxy-silane coating was developed for corrosion protection of magnesium alloy AZ31. The average thickness of the film produced by dip-coating procedure was 14 mu m. The adhesion strength of the epoxy-silane coating to the Mg substrate was evaluated by pull-off tests and was found to be higher than 16 MPa both in dry and wet conditions. The hybrid epoxy-silane coating showed high corrosion resistance both when intact and when punched through by a needle. The low frequency impedance of intact coating was higher than 1 G Omega cm(2) after one month of immersion in 3.5% NaCl solution. Both, artificially induced defects and corrosion sites that appeared on the metal surface did not propagate. Their passivation behavior, that we call fault-tolerance, was observed by EIS, SVET-SIET and SEM-EDS. It was ascribed to the good adhesion, high coating integrity and corrosion inhibiting effect provided by diethylenetriamine used as epoxy hardener. (C) 2014 Elsevier B.V. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19669 |
DOI: | 10.1016/j.porgcoat.2014.11.024 |
ISSN: | 0300-9440 |
Publisher Version: | 10.1016/j.porgcoat.2014.11.024 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Fault-tolerant hybrid epoxy-silane coating for corrosion protection of magnesium alloy AZ31_10.1016j.porgcoat.2014.11.024.pdf | 2.74 MB | Adobe PDF |
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