%0 Journal Article
%A Arrabal Durán, Raúl
%A Pardo Gutiérrez Del Cid, Ángel
%A Merino Casals, María Concepción
%A Merino, S.
%A Casajus, P.
%A Mohedano Sánchez, Marta
%A Rodrigo, P.
%T Corrosion behaviour of Mg–Al alloys with Al thermal spray coatings in humid and saline environments
%D 2009
%@ 1938-159X
%@ 0010-9312
%U https://hdl.handle.net/20.500.14352/107592
%X The corrosion behaviour of thermal spray Al coatings deposited on AZ31, AZ80 and AZ91DMg–Al alloys was evaluated in salt water (3.5 wt.% NaCl), neutral salt fog (ASTM B 117) and highrelative humidity (98% RH, 50 ºC) environments. The changes in the morphology and corrosionbehaviour of the Al coatings induced by cold–pressing post–treatment were also examined. Inchloride–containing environments, the presence of interconnected pores in the as–sprayed Alcoatings facilitated the galvanic acceleration of the corrosion of the magnesium substrates. Thecold–pressed Al coatings revealed improved corrosion behaviour associated with a lower level ofporosity. In high humidity environment, even though the corrosion rates for all the examinedmaterials were lower than in the case of salt fog, similar corrosion features were observed;formation of hydromagnesite on the surface of untreated materials, galvanic corrosion in the Al–TSspecimens and almost negligible corrosion attack of the Al coating with formation of bayerite(β–Al2O3·3H2O) in the case of the cold–pressed specimens
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