Nitrogen ion implantation and in vitro corrosion behavior of as-cast Ti–6Al–7Nb alloy

Thair, L.; Mudali, U. Kamachi; Bhuvaneswaran, N.; Nair, K.G.M.; Asokamani, R.; Raj, Baldev

doi:10.1016/s0010-938x(02)00034-3

Cited by 57 publications

(17 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because bare titanium alloys have a strongly negative standard electrode potential (À1.63 V), they often suffer galvanic and crevice corrosion as well as corrosion embrittlement caused by intensive interactions with the interface material and/or the surrounding environment [5]. In the past decade, various surface modification techniques, including micro-plasma oxidation [6], laser treatment [7], chemical vapor deposition [8], physical vapor deposition [9] and ion implantation [10], have been developed to improve the resistance of titanium alloys against abrasion and corrosion damage. Among these methods, the application of a double glow discharge plasma technique, through the synthesis of nanocrystalline transition metal silicide coatings, has proved to be an economical and effective way to enhance the surface properties of titanium alloys [11,12].…”

Section: Introductionmentioning

confidence: 99%

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Liu

et al. 2014

Acta Materialia

View full text Add to dashboard Cite

nanocrystalline coatings were deposited onto Ti-6Al-4V substrates by a double glow discharge plasma technique. The effects of Nb alloying on the electrochemical behavior of the Ti 5 Si 3 nanocrystalline coatings were systematically investigated in a naturally aerated 5 wt.% H 2 SO 4 solution, for which various electrochemical techniques, including potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), potentiostatic polarization and Mott-Schottky analysis, were employed. Moreover, to evaluate the corrosion performance of the as-deposited coatings over an extended period, their corrosion resistance was analyzed after 7 days' immersion in a 5 wt.% H 2 SO 4 solution by EIS measurements and observations of corroded surface morphologies. The results showed that the Ti 62.5Àx Nb x Si 37.5 (x = 0, 6.3, 12.5) nanocrystalline coatings exhibit superior corrosion resistance compared with Ti-6Al-4V, and their corrosion resistance is enhanced with increasing Nb content, suggesting that Nb alloying is an effective strategy for improving the corrosion protection ability of the Ti 5 Si 3 nanocrystalline coating. The roles of Nb additions in enhancing the corrosion resistance of the Ti 5 Si 3 nanocrystalline coatings can be summarized as: (a) reducing the residual tensile stresses of the as-deposited coatings and (b) tailoring the composition, compactness and electronic structure of the passive films formed. These findings are expected to broaden the application of Ti 5 Si 3 as a highly corrosion-resistant coating for engineering components operating under aggressive conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Liu

et al. 2014

Acta Materialia

View full text Add to dashboard Cite

show abstract

“…However, the protein layer on TiN (fibril meshwork) entrapped mainly red cells and no leukocytes compared with silicon adsorbing platelets retaining red blood cells and a large amount of leukocytes. N-ion implantation is another surface treatment technique used with the purpose of increasing the protection against ion release (corrosion) and eventually increases biocompatibility [18, 19]. …”

Section: Introductionmentioning

confidence: 99%

Bone Response to Surface-Modified Titanium Implants: Studies on the Early Tissue Response to Implants with Different Surface Characteristics

Wexell

Thomsen

Aronsson

et al. 2013

International Journal of Biomaterials

View full text Add to dashboard Cite

In a series of experimental studies, the bone formation around systematically modified titanium implants is analyzed. In the present study, three different surface modifications were prepared and evaluated. Glow-discharge cleaning and oxidizing resulted in a highly stoichiometric TiO2 surface, while a glow-discharge treatment in nitrogen gas resulted in implants with essentially a surface of titanium nitride, covered with a very thin titanium oxide. Finally, hydrogen peroxide treatment of implants resulted in an almost stoichiometric TiO2, rich in hydroxyl groups on the surface. Machined commercially pure titanium implants served as controls. Scanning Auger Electron Spectroscopy, Scanning Electron Microscopy, and Atomic Force Microscopy revealed no significant differences in oxide thickness or surface roughness parameters, but differences in the surface chemical composition and apparent topography were observed. After surface preparation, the implants were inserted in cortical bone of rabbits and evaluated after 1, 3, and 6 weeks. Light microscopic evaluation of the tissue response showed that all implants were in contact with bone and had a large proportion of newly formed bone within the threads after 6 weeks. There were no morphological differences between the four groups. Our study shows that a high degree of bone contact and bone formation can be achieved with titanium implants of different surface composition and topography.

show abstract

“…It can be seen that throughout the entire immersion period, the potentials of the nitrogen implanted samples are much more positive than that of untreated NiTi alloy. It is possibly due to the protective TiN layer formed on the surface [11,12]. However, the OCP value of the N-implanted samples decreases with increasing implantation frequencies.…”

Section: Resultsmentioning

confidence: 97%

In vitro corrosion behavior of TiN layer produced on orthopedic nickel–titanium shape memory alloy by nitrogen plasma immersion ion implantation using different frequencies

Liu

Chu

et al. 2008

Surface and Coatings Technology

View full text Add to dashboard Cite

Nitrogen ion implantation and in vitro corrosion behavior of as-cast Ti–6Al–7Nb alloy

Cited by 57 publications

References 30 publications

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Bone Response to Surface-Modified Titanium Implants: Studies on the Early Tissue Response to Implants with Different Surface Characteristics

In vitro corrosion behavior of TiN layer produced on orthopedic nickel–titanium shape memory alloy by nitrogen plasma immersion ion implantation using different frequencies

Contact Info

Product

Resources

About