2008
DOI: 10.1098/rsif.2007.1313
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Nanomechanical evaluation of nickel–titanium surface properties after alkali and electrochemical treatments

Abstract: In this paper, the suitability of alkali treatment followed by heat treatment at 6008C, and spark oxidation for nickel-titanium, intended for medical applications such as pins, wires and clamps, was evaluated on the basis of nanomechanical and wear testing. In addition, the chemical composition and topography of the surface layer, wetting ability, corrosion resistance and influence of the heat treatment on structure of the alloy were also investigated. The results showed that the highest hardness was observed … Show more

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Cited by 24 publications
(8 citation statements)
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“…Moreover, increasing the concentration of the NaOH solution intensified the Ni/Ti ratio in the treated samples. These findings are in agreement with Chrzanowski et al [22] reporting increased nickel content in the surface top layer with NaOH treatment which would pose the potential risk of decreasing the biocompatibility due to the heightened risk of Ni release.…”
Section: Xps Analysissupporting
confidence: 92%
See 1 more Smart Citation
“…Moreover, increasing the concentration of the NaOH solution intensified the Ni/Ti ratio in the treated samples. These findings are in agreement with Chrzanowski et al [22] reporting increased nickel content in the surface top layer with NaOH treatment which would pose the potential risk of decreasing the biocompatibility due to the heightened risk of Ni release.…”
Section: Xps Analysissupporting
confidence: 92%
“…NaOH treatment is a well-known method that has been applied to various substrate-coating couples. While there are numerous studies focusing on the positive effects of this treatment on the biocompatibility and the following deposition characteristics of the apatite layer [16][17][18][19][20], only a few discussed its disadvantages focusing on NiTi especially on Ni release after surface treatment using NaOH [21,22]. Hence, combining different strategies as NaOH pre-treatment and HA coating to improve the biocompatibility of NiTi samples needs further attention due to the inevitable risk of Ni release.…”
Section: Introductionmentioning
confidence: 99%
“…3 However, to improve the biological performance of the alloy, which mostly relates to the suppression of the nickel release, many types of treatments have been investigated. 1 , 14 , 15 , 21 , 27 , 3037 , 39 , 46 , 47 A few types of these treatments dominate the literature: electropolishing, thermal, anodic-oxidation, and coating formation using Chemical Vapour Deposition (CVD) or Physical Vapour Deposition (PVD) methods focused on DLC coating. The large benefits of electropolishing, should be viewed in the context of the high risk related to the volatile mixtures used (sulfuric acid + methanol) 48 and highly corrosive (i.e., HF) electrolytes; the use of such media is questionable when alternatives are available.…”
Section: Discussionmentioning
confidence: 99%
“…Its biocompatibility results from the presence of a thin protective titanium dioxide surface layer that enhances the corrosion resistance and reduces the release of Ni 2+ ions,, which are cytotoxic and carcinogen ,,. A great deal of attention has been paid to the surface modification of NiTi in order to impart and/or improve surface properties such as biocompatibility,, bioactivity, and corrosion resistance ,,…”
Section: Introductionmentioning
confidence: 99%