CORROSION RESISTANCE IMPROVEMENT OF AISI 316L STAINLESS STEEL USING NITROGEN ION IMPLANTATION

Abstract

CORROSION RESISTANCE IMPROVEMENT OF AISI 316L STAINLESS STEEL USING NITROGEN ION
IMPLANTATION. The nitrogen ion implantation can be used to improve surface mechanical properties and
corrosion resistance behavior of AISI 316L stainless steels by modifying the near-surface layers of these
materials. In this study, an AISI 316L stainless steel plate was implanted with the optimum ion dose of 5 
1016 ion/cm2
for ion energy variation of 60, 80 and 100 keV. Microhardness was measured by Vickers
method, and the results of measurements clearly indicate an enhancement hardness behavior for nitrogen
implanted layer. It is found that the implanted layer hardness was increased by a factor of 1.3 in comparison
to that of the unimplanted samples. The increased hardness resulting from nitrogen ion implantation was
attributed to the formation of an iron nitride phase. Microstructure, chemical composition and surface
morphology studied using the technique of Scanning Electron Microscope (SEM) coupled with Energy
Dispersive X-ray (EDX) and X-ray Diffraction (XRD). Analysis of SEM-EDX micrographs and XRD diffraction
patterns indicate that the nitrogen implanted layer is composed of a metastable single phase which has
properties very hard, good corrosion resistance behavior and wear resistance surface layers of stainless
steel components. Effects of nitrogen ion implantation on the corrosion properties of AISI 316L stainless
steels was evaluated using potentiostat PGS 201T. Corrosion properties of test results showed that there
was a significant improvement in the corrosion resistance in the case of nitrogen implanted samples