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Electrochemical corrosion behaviour of Mg-Al alloys with thermal spray Al/SiCp composite coatings

AutorPardo, A.; Feliú Jr., S.; Merino, M. C.; Mohedano, M.; Casajús, P.; Arrabal, R.
Palabras claveElectrochemical impedance
Mg–Al alloys
Corrosión
Fecha de publicación2012
EditorTaylor & Francis
CitaciónWelding International 26 (6): 448-458 (2012)
ResumenThe corrosion protection of Mg–Al alloys by flame thermal spraying of Al/SiC particles (SiCp) composite coatings was evaluated by electrochemical impedance spectroscopy in 3.5 wt.% NaCl solution. The volume fraction of SiCp varied between 5 and 30%. The as-sprayed Al/SiCp composite coatings revealed a high number of microchannels, largely in the vicinity of the SiCp, that facilitated the penetration of the electrolyte and the subsequent galvanic corrosion of the magnesium substrates. The application of a cold-pressing post-treatment reduced the degree of porosity of the coatings and improved the bonding at the coating/substrate and Al/SiC interfaces. This resulted in improved corrosion resistance of the coated specimens. The effectiveness of the coatings slightly decreased with the addition of 5–30 vol.% SiCp compared with the unreinforced thermal spray aluminium coatings.
URIhttp://hdl.handle.net/10261/111990
DOI10.1080/09507116.2011.592703
Identificadoresdoi: 10.1080/09507116.2011.592703
issn: 1754-2138
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