|About this Abstract
||2010 TMS Annual Meeting & Exhibition
||Coatings for Structural, Biological, and Electronic Applications
||Effect of Superficially Applied Y2O3 Coating on High Temperature Corrosion Behaviour of Ni-Base Superalloys
||Gitanjaly G, Harpreet Singh, Satya Prakash, Surendra Singh
|On-Site Speaker (Planned)
Effect of Y2O3 on high temperature corrosion of Superni 718 and Superni 601 superalloys was investigated in Na2SO4-60%V2O5 environment at 900°C for 50 cycles. Y2O3 was applied as a coating on the surfaces of the specimens. Superni 601 was found to be having better corrosion resistance in comparison with Superni 718 in the Na2SO4-60%V2O5 environment. The Y2O3 superficial coating was successful in decreasing the reaction rate for both the superalloys. In the oxide scale of the alloy Superni 601, Y & V were observed to co-exist thereby indicating the formation of a protective YVO4 phase. There was a distinct presence of protective Cr2O3 rich layer just above the substrate/scale interface in the alloy. Whereas, Cr2O3 was present with Fe and Ni in the scale of Superni 718. Y2O3 seemed to be contributing to better adhesion of the scale as comparatively lesser spalling was noticed in the presence of Y2O3.
||Planned: Other (describe below)