There has been much interest recently in the use of ion implantation for surface alloying as a method of improving corrosion resistance. Surface implanted yttrium improves the oxidation resistance of Ni-20%Cr alloys with regard to the more rapid development of a complete Cr2O3 scale and, especially, its adherence during thermal cycling. For the present investigation, both unimplanted and Y-implanted Ni-20%Cr (280 keV ions to a dose of 2 x 1016 ions/cm2) were obtained from Stott et al. (1) and were oxidized in air at 1000°C for 15 mins., with ∼ 10 μm thick oxide scale being formed on the alloy surface. Both parallel and transverse sections were examined on a Phillips EM 400T analytical electron microscope.
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