Journal
CORROSION SCIENCE
Volume 44, Issue 12, Pages 2737-2756Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0010-938X(02)00075-6
Keywords
magnesium alloys; AZ91D; semi-solid processing; corrosion; impedance spectroscopy
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The microstructure and the corrosion behaviour of high pressure die-cast and semi-solid cast AZ91D magnesium alloys have been investigated. Semi-solid processing leads to a structure with large rounded grains of a solid solution of magnesium (alpha phase) whereas die-cast alloys are more homogeneous. Electrochemical measurements, particularly with impedance spectroscopy, have shown that the semi-solid cast alloy possesses a corrosion rate at least 35% below that of the die-cast alloy. This can be explained with considering the differences between the composition of the primary a phase and the volume fraction of the beta phase, in the two types of alloy. (C) 2002 Elsevier Science Ltd. All rights reserved.
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