24 KB3457 KB23 KB200020242004Praunseis, ZdravkoSundararajan, T.številka:1/2letnik:386 stranistr. 19-24ISSN:1580-2949COBISSID:8767254URN:URN:NBN:SI:doc-9HTQY05ZenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeargondušikionska implantacijakisikkorozijaortopedski implantatititanThe effect of nitrogen-ion implantation on the corrosion resistance of titanium in comparison with oxygen- and argon-ion implantations|Commercially pure (CP) titanium was surface modified with nitrogen-, argon- and oxygen-ion implantations in order to investigate the material's corrosion resistance in a simulated body fluid. Five doses were chosen for the ions, ranging from 5.1015 cm-2 to 2.5-1017 cm-2. In-vitro open-cyclic potential-timemeasurements and cyclic polarization studies were carried out to evaluate the corrosion resistance of the modified surface in comparison to an unmodified surface. Specimens implanted at 4.1016 cm-2 and 7.1016 cm-2 showed the optimum corrosion resistance, higher doses showed a detrimental effect on the corrosion resistance. Argon- and oxygen-ion implantation at these doses did not show any improved corrosion resistance, indicating the beneficial role of nitrogen on the corrosion resistance of titanium in the simulated body-fluid environment. Grazing-incidence X-ray diffraction (GIXD) was employed on the implanted specimens to determine the phases formed with the increasing doses. X-ray photoelectron spectroscopy (XPS) studies on the passive film of the implanted samples and on the unimplanted samples were analyzed in order to understand the role of nitrogen in improving the corrosion resistance. The results of the present investigation indicated that nitrogen-ion implantation can be used as a viable method for improving the corrosion resistance of titanium. The nature of the surface and the reason for the variation and the improvement in the corrosion resistance are discussed in detailPovršinska modifikacija čistega titana je nastala z dušikovo, argonsko in kisikovo ionsko implantacijo z namenom določitve korozijske obstojnosti titanovih površin v simulirani telesni. tekočini. Za ionsko implantacijo !e uporabljeno pet različnih doz ionov v območju od 5.1015 cm- do 2.5.1017 cm-2. Korozijska obstojnost modificirane površine v primerjavi s pogoji brez implantacije je ovrednotena s cikličnimi potencialnimi časovnimi meritvami in študijem ciklične polarizacije. Optimalno korozijsko obstojnost so pokazali vzorci, ki so bili implantirani z dozo 4.1016 cm-2 in 7.1016 cm-2. Preostale ionske doze so poslabšale korozijsko obstojnost implantiranih vzorcev. Pri teh dozah argonska in kisikova ionska implantacija ni izboljšala korozijske odpornosti vzorcev, ki je bila zaznana ob koristnem vplivu dušika na korozijsko obstojnost titana v simulirani telesni tekočini. Pri večanju ionskih doz so nastale fazne spremembe, ki so bile identificirane z rentgensko difrakcijo implantiranih vzorcev. Vloga dušika pri izboljšanju korozijske odpornosti je analizirana s študijem rentgenske spektroskopije fotoelektronov na pasivni plasti pri pogojih implantacije in brez nje. Rezultati predstavljene raziskave kažejo, da je dušikovo ionsko implantacijo mogoče uporabiti kot zanesljivo metodo za izboljšanje korozijske obstojnosti titana. Podrobno je predstavljena lastnost površine in vzrok za spremembo in izboljšanje korozijske odpornostiTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije