Journal
INTERMETALLICS
Volume 16, Issue 7, Pages 860-867Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2008.03.003
Keywords
intermetallics, miscellaneous; corrosion; extrusion
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Different quantities of silicon were added to Mg-6%Zn-0.5%Mn alloy and its effect on corrosion behavior investigated. AC and DC polarization and immersion tests were carried out on the extruded rods, which contain different quantities of silicon. A small quantity of Si (0.5 wt%) forms massive Chinese script Mg2Si intermetallics. Addition of 1 wt% or more Si was found to modify the Chinese script Mg2Si intermetallic into a fine polygonal shape. Improved corrosion behavior is noticed with the alloys containing more than 1 wt% Si addition, whereas addition of less than 1 wt% Si is found to reduce the corrosion resistance of Mg-6%Zn-0.5%Mn alloy. The polygonal shape Mg2Si intermetallics inhibit the corrosion more effectively compared to the Chinese script. (c) 2008 Elsevier Ltd. All rights reserved.
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