Atmospheric Corrosion of Mg Alloy AZ91D Fabricated by a Semi-Solid Casting Technique: The Influence of Microstructure
Artikel i vetenskaplig tidskrift, 2015

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.

Författare

Mohsen Esmaily

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Nooshin Mortazavi Seyedeh

Chalmers, Teknisk fysik, Materialens mikrostruktur

Jan-Erik Svensson

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Mats Halvarsson

Chalmers, Teknisk fysik, Materialens mikrostruktur

D. B. Blucher

SINTEF Materials and Chemistry

A. E. W. Jarfors

Högskolan i Jönköping

M. Wessen

Högskolan i Jönköping

Lars-Gunnar Johansson

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Journal of the Electrochemical Society

0013-4651 (ISSN)

Vol. 162 7 C311-C321

Ämneskategorier

Materialkemi

Korrosionsteknik

DOI

10.1149/2.0341507jes