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Atmospheric Corrosion of Mg Alloy AZ91D Fabricated by aSemi-Solid Casting Technique: The Influence of Microstructure
Chalmers University of Technology.
Chalmers University of Technology,.
University of Technology.
Chalmers University of Technology.
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2015 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 162, no 7, p. C311-C321Article in journal (Refereed) Published
Abstract [en]

The atmospheric corrosion behavior of alloy AZ91D produced by a semi-solid metal (SSM) technique and by conventional high pressure die casting (HPDC) was investigated for up to 1176 hours in the laboratory. Alloy AZ91D in the SSM state was fabricated using a rheocasting (RC) technique in which the slurry was prepared by the RheoMetal process. Exposures were performed in 95% RH air at 22 and 4 degrees C. The RC alloy AZ91D exhibited significantly better corrosion resistance than the HPDC material at two temperatures studied. The effect of casting technology on corrosion is explained in terms of the microstructural differences between the materials. For example, the larger number density of cathodic beta phase particles in the HPDC material initially causes relatively rapid corrosion compared to the RC material. During later stages of corrosion, the more network-like beta phase particles in the RC alloy act as a corrosion barrier, further improving the relative corrosion resistance of the RC material.

Place, publisher, year, edition, pages
2015. Vol. 162, no 7, p. C311-C321
Keyword [en]
Alloys, Atmospheric corrosion, Billets (metal bars), Corrosion, Corrosion resistance, Die casting, Atmospheric corrosion behavior, Casting technology, Corrosion barriers, High pressure die casting, Micro-structural, Rapid corrosion, Semi solid casting, Semi solid metals
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-28888DOI: 10.1149/2.0341507jesISI: 000355643700050Scopus ID: 2-s2.0-84929464342OAI: oai:DiVA.org:hj-28888DiVA, id: diva2:891446
Available from: 2016-01-07 Created: 2016-01-07 Last updated: 2017-12-01Bibliographically approved

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Jarfors, Anders E.W.Wessén, Magnus

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