Abstract
The Al filming of steel using the disproportionation of Al subsulphide was studied. Chemical vapour deposition was realised using (2Al2O3+6C+Al2S3) or (4Al+Al2S3) as reaction mixture at 1100°C and pressure of 5 Pa. It is indicated that the coating formed by evaporation of (2Al2O3+6C+Al2S3) consists of α-Fe and Al13Fe4, possesses thin diffusion layer and dark rough surface and is resistant to solution of nitric acid with alcohol, but the coating formed by evaporation of (4Al+Al2S3) consists of Fe3Al and AlFe and possesses thick diffusion layer and bright smooth surface.
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