Effect of nitrogen ion implantation on the localized corrosion behavior of titanium modified type 316L stainless steel in simulated body fluid |
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Authors: | T Sundararajan S Rajeswari M Subbaiyan U Kamachi Mudali K G M Nair |
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Affiliation: | (1) Department of Analytical Chemistry, University of Madras, Guindy Campus, 600 025 Chennai, India;(2) Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, 603 102 Kalpakkam, India |
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Abstract: | Nitrogen ion implantation on titanium-modified type 316L stainless steel (SS) at the energy of 70 keV was carried out at different
doses ranging from 1×1015 to 2.5×1017 ions/cm2. These samples were subjected to open circuit potential (OCP)—time measurement, cyclic polarization, and accelerated leaching
studies—in order to discover the optimum dose that can provide good localized corrosion resistance in a simulated body fluid
condition. The results showed that the localized corrosion resistance improved with an increase in doses up to 1×1017 ions/cm2, beyond which it started to deteriorate. The results of the accelerated leaching studies showed that the leaching of the
major alloying elements was arrested upon nitrogen ion implantation. Gracing incidence x-ray diffraction studies showed the
formation of chromium nitrides at a dose of 2.5×1017 ions/cm2. X-ray photoelectron spectroscopy studies revealed the presence of these chromium nitrides in the passive film, which was
attributed to the decreased corrosion resistance at a higher dose. Secondary ion mass spectroscopy studies on the passive
film showed the variation in the depth profile upon nitrogen ion implantation. Thus, nitrogen ion implantation can be effectively
used as a method to improve the corrosion resistance of the orthopedic implant devices made of titanium-modified type 316L
SS. The nature of the passive film and its influence on corrosion resistance are discussed in this article. |
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Keywords: | austenitic stainless steels nitrogen ion implantation passive film pitting corrosion titanium addition |
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