Abstract
The deposition of silicon and/or aluminium on Armco iron by means of chemical vapour deposition or immersion leads to the formation of the silicide Fe 3Si and the aluminides FeAl and FeAl 3. The study of the oxidation and sulphidation resistance of the coated samples demonstrates that they can be ranked in the following order for their resistance to both oxidation and sulphidation: iron < silicized iron < aluminized iron < heat-treated iron. Good oxidation resistance is linked to the formation of the oxides Fe 2SiO 4, SiO 2, Al 2O 3 and FeAl 2O 4. The excellent sulphidation resistance of heat-treated iron is linked to the formation of a compact Al 2S 3 films, which reduces the diffusion rate of metallic ions.
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