The corrosion behaviour of nickel titanium shape memory alloys

Rondelli, G.; Vicentini, B.; Cigada, A.

doi:10.1016/0010-938x(90)90004-o

Cited by 97 publications

(34 citation statements)

References 3 publications

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“…3b. This result agrees with the obtained corrosion measurements which revealed a wide passivity range that extends up to very high potentials and absence of hysteresis loop; these features indicate high resistance to pitting [24]. …”

Section: Surface Morphologysupporting

confidence: 82%

The Effect of Radio Frequency Plasma Nitriding on Biocompatibility of Nickel-Titanium Shape Memory Alloys

El-Hossary¹,

Khalil²,

Kassem³

et al. 2016

JBAP

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Abstract-Nickel-titanium (Ni-Ti) shape memory alloys (SMAs) are attractive materials for orthopedic and dental implants, due to its two intrinsic properties including shape memory effect (SME) and superelasticity (SE), which may not be found in other commonlyused surgical metals. Possible Ni ion release, however, hampers their medical applications, particularly in orthopedic implants where fretting is always expected at the articulating surface. Inductively coupled radio frequency plasma (ICRFP) was employed to alter the surface of equiatomic Ni-Ti discs in order to create a barrier to out-diffusion of Ni ions from the bulk material. The ICRFP experiments were carried out with nitrogen, which promoted the formation of a titanium nitride layer on the surface of the Ni-Ti samples. The present paper explores the biocompatibility and performance of the ICRFP treated and untreated Ni-Ti samples. The results confirm that nitrogen plasma modified Ni-Ti alloys are potentially suitable materials for orthopedics without inducing harmful biological effects.

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Section: Surface Morphologysupporting

confidence: 82%

The Effect of Radio Frequency Plasma Nitriding on Biocompatibility of Nickel-Titanium Shape Memory Alloys

El-Hossary¹,

Khalil²,

Kassem³

et al. 2016

JBAP

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“…For instance, the alloy absorbs hydrogen in neutral 0.9% NaCl solution under an applied potential below À0:9 V vs. a saturated calomel electrode (SCE) for 2 h. 14) The corrosion resistance of the alloy immersed in NaF solution is lower than that in NaCl solution. [15][16][17][18][19] Accordingly, the alloy immersed under cathodically applied potential in NaF solution, as compared with that in NaCl solution, seems to readily absorb hydrogen. In fact, the alloy absorbs hydrogen in neutral 2.0% NaF solution at 37 C without applied potential with a long immersion time (above 1000 h).…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Absorption and Thermal Desorption Behavior of Ni-Ti Superelastic Alloy Immersed in Neutral NaCl and NaF Solutions under Applied Potential

et al. 2009

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The hydrogen absorption and thermal desorption behavior of Ni-Ti superelastic alloy immersed in neutral NaCl and NaF aqueous solutions at 25C under an applied cathodic potential for 2 h have been systematically investigated by hydrogen thermal desorption analysis. The critical potential for hydrogen absorption is independent of the type and concentration of solution. The amount of absorbed hydrogen increases with decreasing applied potential, although it is only slightly changed by the type of solution. The amount of hydrogen desorbed at low temperatures, for the alloy immersed in NaF solutions, is larger than those in NaCl solutions, suggesting that the type of solution affects the hydrogen states in the alloy. The present results indicate that for Ni-Ti superelastic alloy, compared with titanium and its alloys, the critical potential for hydrogen absorption is located in a more noble direction, and the amount of absorbed hydrogen is large in NaCl and NaF solutions. Thus, the hydrogen embrittlement of Ni-Ti superelastic alloy probably occurs more readily than those of titanium and its alloys in NaCl and NaF solutions.

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“…22 As-cast NiTi alloys exhibited higher scratch repassivation potentials in the range 180 -300 mV depending on the acidity of corrosive solutions. 23,24 Pitting potentials in the same voltage range have also been observed by Venugopalan 25 when a scratch was automatically applied to the electropolished surface of as-cast NiTi alloy by a ceramic stylus. The fact that Nitinol wires and as-cast alloy with surfaces prepared in different manners exhibit almost similar pitting potentials indicates that in scratch tests, the repassivation ability of the bulk of the material is tested.…”

Section: Scratch Testsmentioning

confidence: 63%

Effect of chemical etching and aging in boiling water on the corrosion resistance of nitinol wires with black oxide resulting from manufacturing process

Shabalovskaya

Rondelli²,

Anderegg

et al. 2003

J Biomed Mater Res

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The effect of chemical etching in a HF/HNO(3) acid solution and aging in boiling water on the corrosion resistance of Nitinol wires with black oxide has been evaluated with the use of potentiodynamic, modified potentiostatic ASTM F746, and scratch tests. Scanning-electron microscopy, elemental XPS, and Auger analysis were employed to characterize surface alterations induced by surface treatment and corrosion testing. The effect of aging in boiling water on the temperatures of martensitic transformations and shape recovery was evaluated by means of measuring the wire electroresistance. After corrosion tests, as-received wires revealed uniformly cracked surfaces reminiscent of the stress-corrosion-cracking phenomenon. These wires exhibited negative breakdown potentials in potentiostatic tests and variable breakdown potentials in potentiodynamic tests (- 100 mV to + 400 mV versus SCE). Wires with treated surfaces did not reveal cracking or other traces of corrosion attacks in potentiodynamic tests up to + 900-1400-mV potentials and no pitting after stimulation at + 800 mV in potentiostatic tests. They exhibited corrosion behavior satisfactory for medical applications. Significant improvement of corrosion parameters was observed on the reverse scans in potentiodynamic tests after exposure of treated wires to potentials > 1000 mV. In scratch tests, the prepared surfaces repassivated only at low potentials, comparable to that of stainless steel. Tremendous improvement of the corrosion behavior of treated Nitinol wires is associated with the removal of defect surface material and the growth of stable TiO(2) oxide. The role of precipitates in the corrosion resistance of Nitinol-scratch repassivation capacity in particular-is emphasized in the discussion.

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The corrosion behaviour of nickel titanium shape memory alloys

Cited by 97 publications

References 3 publications

The Effect of Radio Frequency Plasma Nitriding on Biocompatibility of Nickel-Titanium Shape Memory Alloys

The Effect of Radio Frequency Plasma Nitriding on Biocompatibility of Nickel-Titanium Shape Memory Alloys

Hydrogen Absorption and Thermal Desorption Behavior of Ni-Ti Superelastic Alloy Immersed in Neutral NaCl and NaF Solutions under Applied Potential

Effect of chemical etching and aging in boiling water on the corrosion resistance of nitinol wires with black oxide resulting from manufacturing process

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