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Atmospheric Corrosion of Mg Alloy AZ91D Fabricated by a Semi-Solid Casting Technique: The Influence of Microstructure

Mohsen Esmaily (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Seyedeh Nooshin Mortazavi (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; Jan-Erik Svensson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Mats Halvarsson (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; D. B. Blucher ; A. E. W. Jarfors ; M. Wessen ; Lars-Gunnar Johansson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi)
Journal of the Electrochemical Society (0013-4651). Vol. 162 (2015), 7, p. C311-C321.
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2015-06-30.
CPL Pubid: 219118

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Oorganisk miljökemi
Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)

Ämnesområden

Materialkemi
Korrosionsteknik

Chalmers infrastruktur

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