Abstract
The structure of the scale of the Fe-Al, Fe-Cr-Al and Fe-Si alloys was observed.The relation between the thickness of each layer of the scale and aluminium content when the Fe-Al alloys were heated in the air at 1200°C for 1 hour, were shown in fig. 1. The chemical compositions of the I, II, III and IV layer were Fe2O3, Fe3O4, FeO and FeO·(Fe, Al)2O3, respectively. The Fe-Al alloys produced α-Al2O3 film on their surface. On the Fe-Cr-Al alloys which contained comparatively small content of aluminium and Chromium, the three layered scale which was consiste of Fe2O3, Fe3O4 and FeO·(Fe, Cr, Al)2O3, was produced. The thickness of the scale of the Fe-Si alloys was shown in fig. 6 with reference to silicon content. The scale of the Fe-Si alloys lower than about 3% Si, was consisted of four layees Fe2O3, Fe3O4, FeO and Fe2SiO4 one. On the surface of the high silicon alloys, SiO2 (β-tridymite) film was produced.
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