Effect of heat treatment on corrosion behavior of {AZ63} magnesium alloy in 3.5 wt.% sodium chloride solution
By Li, Jiarun; Jiang, Quantong; Sun, Huyuan; Li, Yantao
Published in Corrosion Science
NULL
2016
Abstract
Abstract The as-cast, homogenized, and peak-aged {AZ63} alloys are investigated via microstructure observation, {EDS} analysis, hydrogen evolution, and electrochemical tests. The results suggest that the heat treatments exert an influence on the corrosion behavior of {AZ63} alloy via the microstructure transformation. The corrosion of homogenized alloy is retarded by protective oxide layer at first, but achieves highest corrosion rate among the three alloys owing to the less protective products film. The micro-galvanic couples endow the as-cast and peak-aged alloys high dissolution activity, but the adhesive products alleviate the corrosion. Two models are proposed to interpret the dissolution mechanism for these alloys.
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