Abstract
The influence of different surface treatments (laser surface treatment, silicon nitride, and 25 wt.% Al 2(OH) 4Si 2O 5—75 wt.% Na 2SiO 3), on the hot corrosion behaviour of IN-657 superalloy has been studied. The corrosion tests were performed in an oxidizing atmosphere in contact with a molten mixture of 82% K 2S 2O 7—18% V 2O 5. The effects of operation temperature and carbon residues as component of the molten mixture were also analyzed. The best results were obtained for the kaolin and methasilicate mixture coating. Laser surface treatment and the CVD-silicon nitride are not recommended for surface modification of the IN-657 superalloy. Taking into account the results obtained, the authors suggest the average temperature and molten salt compositions where the above coating can work satisfactorily.
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