Abstract
In the present work, the oxidation resistance and mechanism of the intermetallic compound of magnesium silicide (Mg2Si) were examined, which was formed by pack cementation technique for the first time. This method is reported to be economic, simple and environmental friendlier comparing with other coating processes. The oxidation resistance was investigated, under high-temperature air exposure by in situ thermogravimetric measurements. Moreover, the mechanism and oxidation kinetics were also examined by four different isothermal oxidations at 550, 600, 650 and 700 °C. It was found that the specimens begin to oxidize slightly over 465 °C, and over 650 °C the oxidation rate increases significantly. After isothermal oxidation tests at four different temperatures, SEM and XRD analyses of the samples revealed that the main products were MgO and Si, which were located in an additional layer formed on the surface of the specimens. Moreover, mixed oxides were also identified at the highest temperature oxidation tests.
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