%0 Journal Article
%A Arrabal Durán, Raúl
%A Pardo Gutiérrez Del Cid, Ángel
%A Merino Casals, María Concepción
%A Mohedano Sánchez, Marta
%A Casajús, P.
%A Merino, S.
%T AlSiC thermal spray coatings for corrosion protection of Mg–Al alloys in humid and saline environments
%D 2010
%@ 0257-8972
%U https://hdl.handle.net/20.500.14352/107712
%X The corrosion behaviour of thermal spray Al/SiC coatings deposited on AZ31, AZ80 and AZ91D Mg–Al–Zn alloys was evaluated in neutral salt fog (ASTM B 117) and high relative humidity (98% RH, 50 °C) environments. The findings revealed porous as-sprayed coatings with paths providing access of the corrosive media to the magnesium substrates. This resulted in galvanic corrosion at the substrate/coating interfaces and formation of magnesium corrosion products, which eventually led to coating spalling in the case of salt fog tests after protracted times of exposure. The application of a cold-pressing post-treatment improved the corrosion performance of the coatings. Thus, in high humidity atmosphere, corrosion signs were only visible at the Al/SiC interfaces in the outermost surface of the coatings and, in salt fog environment, the galvanic corrosion of the substrates was delayed.
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