THe hot-corrosion behavior of novel Co-deposited chromium-modified aluminide coatings
作者： B. Gleeson , W. H. Cheung , W. Da Costa , D. J. Young
DOI: 10.1007/BF00665662
关键词: Coating 、 Lamellar structure 、 Aluminide 、 Conversion coating 、 Corrosion 、 Metallurgy 、 Titanium alloy 、 Chromium 、 Materials science 、 Superalloy
摘要: This paper reports the successful co-deposition of inclusion-free chromiummodified aluminide coatings using a pack-cementation process. The substrate used was nickel-base superalloy, Rene 80H. were outward-diffusion type; however, unlike usual coatings, present relatively free pack inclusions. consisted α-Cr precipitates in matrix β-NiAl. morphology and distribution could be adjusted to extent that two types coating structures obtained. Type I structure contained lamellar situated surface region coating, whereas II small, spheroidal distributed throughout outer two-layered coating. Both exhibited significantly improved hot-corrosion resistance 0.1% SO2-O2 environment at 900°C compared commercial coalting. A study corrosion behavior containing inclusions showed deleterious coatings. chromium-aluminide dependent on both amount
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