Effect of surface preparation on corrosion properties and nickel release of a NiTi alloy

Miao, Weidong; Mi, Xujun; Xu, Genqi; Li, Huachu

doi:10.1016/s1001-0521(08)60090-x

Cited by 9 publications

(2 citation statements)

References 5 publications

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“…43 However, some reports suggested that nickel release from nickel–titanium was at a lower level than that observed for stainless steel, which has four times less nickel. 26 , 28 , 36 , 42 , 44 – 45 Despite the high nickel content, the toxicity of the alloy is debatable and this could be related to the oxidation state of the nickel, and typically its lower concentration on the surface as the surface is primarily occupied by titanium dioxide. This thin TiO 2 coat may be critical for good biocompatibility.…”

Section: Discussionmentioning

confidence: 99%

Biocompatible, Smooth, Plasma-Treated Nickel–Titanium Surface – An Adequate Platform for Cell Growth

et al. 2011

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High nickel content is believed to reduce the number of biomedical applications of nickel-titanium alloy due to the reported toxicity of nickel. The reduction in nickel release and minimized exposure of the cell to nickel can optimize the biocompatibility of the alloy and increase its use in the application where its shape memory effects and pseudoelasticity are particularly useful, e.g., spinal implants. Many treatments have been tried to improve the biocompatibility of Ni-Ti, and results suggest that a native, smooth surface could provide sufficient tolerance, biologically. We hypothesized that the native surface of nickel-titanium supports cell differentiation and insures good biocompatibility. Three types of surface modifications were investigated: thermal oxidation, alkali treatment, and plasma sputtering, and compared with smooth, ground surface. Thermal oxidation caused a drop in surface nickel content, while negligible chemistry changes were observed for plasma-modified samples when compared with control ground samples. In contrast, alkali treatment caused significant increase in surface nickel concentration and accelerated nickel release. Nickel release was also accelerated in thermally oxidized samples at 600 °C, while in other samples it remained at low level. Both thermal oxidation and alkali treatment increased the roughness of the surface, but mean roughness R(a) was significantly greater for the alkali-treated ones. Ground and plasma-modified samples had 'smooth' surfaces with R(a)=4 nm. Deformability tests showed that the adhesion of the surface layers on samples oxidized at 600 °C and alkali treatment samples was not sufficient; the layer delaminated upon deformation. It was observed that the cell cytoskeletons on the samples with a high nickel content or release were less developed, suggesting some negative effects of nickel on cell growth. These effects were observed primarily during initial cell contact with the surface. The most favorable cell responses were observed for ground and plasma-sputtered surfaces. These studies indicated that smooth, plasma-modified surfaces provide sufficient properties for cells to grow.

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Section: Discussionmentioning

confidence: 99%

Biocompatible, Smooth, Plasma-Treated Nickel–Titanium Surface – An Adequate Platform for Cell Growth

et al. 2011

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“…Furthermore, nanostructured samples have an ultrafine grain size and clearly a higher density of grain boundaries and surface area. Therefore, the lower resistance to charge transfer (R ct ) and higher corrosion rate of the nanostructured samples could be correlated to their higher surface activity and the difference in composition and structure [32,33].…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Tribocorrosion behaviour of nanostructured titanium substrates processed by high-pressure torsion

Faghihi

Szpunar

2010

Nanotechnology

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Aseptic loosening induced by wear particles from artificial bearing materials is one of the main causes of malfunctioning in total hip replacements. With the increase in young and active patients, complications in revision surgeries and immense health care costs, there is considerable interest in wear-resistant materials that can endure longer in the harsh and corrosive body environment. Here, the tribological behaviour of nanostructured titanium substrates processed by high-pressure torsion (HPT) is investigated and compared with the coarse-grained samples. The high resolution transmission electron microscopy reveals that a nanostructured sample has a grain size of 5-10 nm compared to that of ∼ 10 µm and ∼ 50 µm for untreated and annealed substrates, respectively. Dry and wet wear tests were performed using a linear reciprocating ball-on-flat tribometer. Nanostructured samples show the best dry wear resistance and the lowest wear rate in the electrolyte. There was significantly lower plastic deformation and no change in preferred orientation of nanostructured samples attributable to the wear process. Electrochemical impedance spectroscopy (EIS) shows lower corrosion resistance for nanostructured samples. However, under the action of both wear and corrosion the nanostructured samples show superior performance and that makes them an attractive candidate for applications in which wear and corrosion act simultaneously.

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Nickel release rate of 18 KW gold alloy for ornaments

Yuan¹,

Li²,

Liu

2013

Rare Met.

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Effect of surface preparation on corrosion properties and nickel release of a NiTi alloy

Cited by 9 publications

References 5 publications

Biocompatible, Smooth, Plasma-Treated Nickel–Titanium Surface – An Adequate Platform for Cell Growth

Biocompatible, Smooth, Plasma-Treated Nickel–Titanium Surface – An Adequate Platform for Cell Growth

Tribocorrosion behaviour of nanostructured titanium substrates processed by high-pressure torsion

Nickel release rate of 18 KW gold alloy for ornaments

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