Corrosion protection of Mg/Al alloys by thermal sprayed aluminium coatings
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2009
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Elsevier
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A. Pardo, P. Casajús, M. Mohedano, A.E. Coy, F. Viejo, B. Torres, E. Matykina, Corrosion protection of Mg/Al alloys by thermal sprayed aluminium coatings, Applied Surface Science, Volume 255, Issue 15, 2009, Pages 6968-6977, ISSN 0169-4332, https://doi.org/10.1016/j.apsusc.2009.03.022. (https://www.sciencedirect.com/science/article/pii/S0169433209002803)
Abstract
The protective features of thermal sprayed Al-coatings applied on AZ31, AZ80 and AZ91D magnesium/aluminium alloys were evaluated in 3.5 wt.% NaCl solution by electrochemical and gravimetric measurements. The changes in the morphology and corrosion behaviour of the Al-coatings induced by a cold-pressing post-treatment were also examined. The specimens were characterized by scanning electron microscopy, energy dispersive X-ray analysis and low-angle X-ray diffraction. The as-sprayed Al-coatings revealed a high degree of porosity and poor corrosion protection, which resulted in galvanic acceleration of the corrosion of the magnesium substrates. The application of a cold-pressing post-treatment produced more compact Al-coatings with better bonding at the substrate/coating interface and higher corrosion resistance regardless of the nature of the magnesium alloy.