Abstract
Magnesium alloys are remarkably corroded in chloride environments. The fundamental corrosion behavior of AM60 magnesium alloy cast into copper mold was investigated through a polarization test and electrochemical impedance spectroscopy. Metallographic characteristics were evaluated by optical microscopy using the sample in the conditions of as cast, as solution-treated and as aged. The solution-treated sample showed an excellent corrosion resistance because of its homogeneous microstructure. The other samples have poor corrosion resistance compared with the solution-treated sample. Cross sectional observation of the sample corroded under the constant quantity of electric charge revealed that inhomogeneity of microstructure advanced active dissolution of the pit bottom. The electrochemical characteristics for AM60 magnesium alloy related closely to their microstructure.
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