Corrosion behaviour of Mg/Al alloys with composite coatings
Loading...
Official URL
Full text at PDC
Publication date
2009
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Citations
Exportar
Citation
A. Pardo, M.C. Merino, M. Mohedano, P. Casajús, A.E. Coy, R. Arrabal, Corrosion behaviour of Mg/Al alloys with composite coatings, Surface and Coatings Technology, Volume 203, Issue 9, 2009, Pages 1252-1263, ISSN 0257-8972, https://doi.org/10.1016/j.surfcoat.2008.10.030.
Abstract
The corrosion behaviour of aluminium/silicon carbide (Al/SiC) composite coatings deposited by thermal spray on AZ31, AZ80 and AZ91D magnesium-aluminium alloys was investigated by electrochemical and gravimetric measurements in 3.5 wt.% NaCl solution at 22 °C. Corrosion products were examined by scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis and low-angle X-ray diffraction (XRD). Al/SiC composite coatings in the as-sprayed state revealed high level of porosity with poor bonding at the Al/SiC and coating/substrate interfaces, which facilitated degradation of the magnesium substrates by a mechanism of galvanic corrosion. Cold-pressing post-treatment produced more compact coatings with improved corrosion performance in 3.5 wt.% NaCl compared with as-sprayed coatings.