Abstract: The filming on steel using the disproportionation reaction of sub-sulphide of Al was studied. The chemical vaporization depositions were realized using(2Al2O3+6C+Al2S3) or (4Al+Al2S3) as reaction mixture at 1100℃ and the pressure of 5Pa. It is indicated that the coat 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 coat formed by evaporation of (4Al+Al2S3) consists of Fe3Al and AlFe, and possesses thick diffusion layer and bright smooth surface.
The filming on steel using the disproportionation reaction of sub-sulphide of Al was studied. The chemical vaporization depositions were realized using(2Al2O3+6C+Al2S3) or (4Al+Al2S3) as reaction mixture at 1 100 ℃ and the pressure of 5 Pa. It is indicated that the coat 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 coat formed by evaporation of (4Al+Al2S3) consists of Fe3Al and AlFe, and possesses thick diffusion layer and bright smooth surface.
图5 (2Al2O3+6C+Al2S3)为蒸发源的镀层截面 HF腐蚀后的形貌 Fig.5 Cross-sectional microstructure of film prepared using(2Al2O3+6C+ Al2S3) as reactin mixtrure after corrasion of HF
图6 (4Al+Al2S3)为蒸发源的镀层截面的形貌 Fig.6 Cross-sectional microstructures of films prepared using(4Al+Al2S3) as reaction mixture