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Research Article
Corrosion behavior of heat treated Mg-xZn (x=0.5 – 3) alloys
Erkan Koç*,1, Fozi Mustafa Salem Makhlof2
1Department of Metallurgical and Materials Engineering, Karabuk University, Karabük
2Department of Mechanical Engineering, Higher Institute of Comprehensive Occupations, Misrata, Libya
Keywords
Abstract
Magnesium alloys,
Heat treatment,
Microstructure,
Corrosion
The purpose of this study is to investigate the effects of zinc (0,5-1-2-3 wt.%) additions and heat treatment parameters on the microstructure, hardness and corrosion properties of magnesium zinc alloys. After the solution heat treatment at 400ºC, the samples subjected to 8 and 16 hours heat treatment. Microstructure studies showed that the grain size decreased with the increase of Zn content and the MgZn intermetallic phase was formed by the addition of 3 wt.% Zn. Hardness of the samples was increased with increase of Zn content before and after heat treatment. For the as-cast samples, as the amount of Zn increased, corrosion current density (Icorr) and corrosion rate (Pi) increased. As the amount of Zn increased, Icorr and Pi values decreased after 8 hours and 16 hours of heat treatment respectively. It can be suggested that in the galvanic couple of Mg-3Zn, α-Mg matrix phase behaves as an anode and MgZn intermetallic phase behaves as a cathode.
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