Corrosion behaviour of Mg-Al alloys with Al-11Si thermal spray coatings

The corrosion resistance of AZ31, AZ80 and AZ91D Mg–Al alloys with Al–11Sithermal spray coatings was evaluated by electrochemical and gravimetricmeasurements in 3.5 wt% NaCl solution. The changes in the morphology andcorrosion behaviour of the Al–11Si coatings induced by a cold-pressingpost-treatmen...

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Bibliographic Details
Authors: Pardo Gutiérrez Del Cid, Ángel, Merino Casals, María Concepción, Casajus, P., Mohedano Sánchez, Marta, Arrabal Durán, Raúl, Matykina, Endzhe
Format: article
Publication Date:2009
Country:España
Institution:Universidad Complutense de Madrid (UCM)
Repository:Docta Complutense
Language:English
OAI Identifier:oai:docta.ucm.es:20.500.14352/107714
Online Access:https://hdl.handle.net/20.500.14352/107714
Access Level:Open access
Keyword:66
Materiales
3312 Tecnología de Materiales
3303 Ingeniería y Tecnología Químicas
Description
Summary:The corrosion resistance of AZ31, AZ80 and AZ91D Mg–Al alloys with Al–11Sithermal spray coatings was evaluated by electrochemical and gravimetricmeasurements in 3.5 wt% NaCl solution. The changes in the morphology andcorrosion behaviour of the Al–11Si coatings induced by a cold-pressingpost-treatment under 32 MPa were also examined. The as-sprayed Al–11Sicoatings revealed high degree of porosity and poor corrosion protection, whichresulted in galvanic acceleration of the corrosion of the magnesium substrates.The application of a cold-pressing post-treatment produced more compactAl–11Si coatings with better bonding at the substrate/coating interface andslightly higher corrosion resistance. However, interconnected pores remained inthe cold-pressed coatings due to the low plasticity of the Al–11Si powder andgalvanic corrosion of the substrate was observed after immersion in 3.5 wt%NaCl for 10 days