Abstract
Nitrogen ion implanted type 316L stainless steel orthopaedic implant devices showed three fold improvement in the localized corrosion (pitting, crevice) resistance in a simulated human body environment compared to unimplantated condition. Also, the nitrogen ion implanted 316L SS specimens indicated that the release of iron, chromium, and nickel ions were considerably reduced compared to unimplanted specimen. XPS studies of the nitrogen ion implanted specimen showed the presence of nitrogen in solid solution, and nitrides along with oxides which are attributed to the enhanced corrosion resistance. SIMS depth profiling results indicated that implanted nitrogen is present in the surface along with the oxide layers. Residual stress measurement results showed an increase in the compressive residual stresses in the nitrogen implanted layer which was due to the implantation process. The formation of high density nitrides may attributed to the improvement in localized corrosion resistance of nitrogen implanted specimens.
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