Electropolishing and passivation of NiTi shape memory alloy

Simka, Wojciech; Kaczmarek, Marcin; Baron-Wiecheć, A.; Nawrat, G.; Marciniak, J.; Żak, Jerzy

doi:10.1016/j.electacta.2009.11.097

Cited by 114 publications

(59 citation statements)

References 26 publications

(27 reference statements)

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“…The electropolishing (EP) [1][2][3][4][5][6][7], magnetoelectropolishing (MEP) , and high-current density electropolishing (HDEP) [30][31][32] processes generally result in bright and smooth surfaces with nanometer oxide film created. On the other hand, Plasma Electrolytic Oxidation (PEO), known also as Micro Arc Oxidation (MAO) [33][34][35][36][37][38][39][40][41][42], may be used to obtain on metallic substrate the micro-layers, to be employed for different applications, e.g. as a part of automobile catalysts and/or to biomaterials.…”

Section: Introductionmentioning

confidence: 99%

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SEM and EDS Characterization of Porous Coatings Obtained On Titaniumby Plasma Electrolytic Oxidation in Electrolyte Containing Concentrated Phosphoric Acid with Zinc Nitrate

Rokosz

Hryniewicz

Pietrzak

et al. 2017

Advances in Materials Science

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The SEM and EDS results of porous coatings formed on pure titanium by Plasma Electrolytic Oxidation (Micro Arc Oxidation) under DC regime of voltage in the electrolytes containing of 500 g zinc nitrate Zn(NO 3 ) 2 ·6H 2 O in 1000 mL of concentrated phosphoric acid H 3 PO 4 at three voltages, i.e. 450 V, 550 V, 650 V for 3 minutes, are presented. The PEO coatings with pores, which have different shapes and the diameters, consist mainly of phosphorus, titanium and zinc. The maximum of zinc-to-phosphorus (Zn/P) ratio was found for treatment at 650 V and it equals 0.43 (wt%) | 0.20 (at%), while the minimum of that coefficient was recorded for the voltage of 450 V and equaling 0.26 (wt%) | 0.12 (at%). Performed studies have shown a possible way to form the porous coatings enriched with zinc by Plasma Electrolytic Oxidation in electrolyte containing concentrated phosphoric acid H 3 PO 4 with zinc nitrate Zn(NO 3 ) 2 ·6H 2 O.

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Section: Introductionmentioning

confidence: 99%

“…Zinc enrichment of porous PEO coatings is the main subject of the present paper. In addition, it is also desirable to form the surface with the least amount of vanadium, aluminum, and nickel, which are toxic to the human body [41,43,53].…”

Section: Introductionmentioning

confidence: 99%

SEM and EDS Characterization of Porous Coatings Obtained On Titaniumby Plasma Electrolytic Oxidation in Electrolyte Containing Concentrated Phosphoric Acid with Zinc Nitrate

Rokosz

Hryniewicz

Pietrzak

et al. 2017

Advances in Materials Science

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“…They should feature proper biotolerance, and what follows -high resistance to electrochemical corrosion in contact with blood. Corrosion properties of materials for medicine depend to a great extent on production technology (among other things strain in plastic forming, the way of surface preparation) [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Impact of Sterilisation and Strain Hardening in Drawing Process on Resistance to Electrochemical Corrosion of Wires Intended in Cardiology

Przondziono

Hadasik

Walke

et al. 2016

Archives of Metallurgy and Materials

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The study presents results of tests of impact of work hardening in cold drawing process, surface treatment and sterilisation on resistance to electrochemical corrosion of wires made of stainless steel X2CrNiMo 17-12-2 intended for cardiology. Potentiodynamic tests were performed on the ground of registered anodic polarisation curves in artificial plasma solution. Static uniaxial tension test made the ground for determination of strength characteristics of wires and the flow curve. Functions presenting the change of polarisation resistance according to strain applied in drawing process were selected. Test results show deterioration of corrosion properties of wires with work hardening. Surface modification of passivated surface caused increase of resistance of stainless steel wires to electrochemical corrosion, whereas sterilisation with pressurised water steam deteriorated that resistance.

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“…The lower corrosion resistance of the shape memory alloy observed is a result of the different thermal treatments needed to control the transformation temperatures of the NiTi alloys, that also modify the surface oxide 2,11 . The condition of a surface strongly affects its corrosion resistance, which has lead to a wide range of data reported on the corrosion of NiTi devices, and so care should be taken when considering any results from the literature that do not explicitly state how the surfaces were prepared and tested 5,[23][24][25] . As expected, in this study, the electrolytically polished superelastic and shape memory wires presented more noble corrosion potential values, when compared with their corresponding as received samples.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Surface Characterization of NiTi Superelastic and Shape Memory Alloys After Electrolytic Polishing

et al. 2017

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For the biomedical application of NiTi alloys, an excellent surface finishing process is required to guarantee high corrosion resistance and biocompatibility, eliminating the allergenic and toxic effects associated with the release of nickel ions in the body. Electropolishing is a process that can reduce surface imperfections and form a thin protective layer of TiO 2 , even in complex-shaped devices. The main objective of our study was to find and report suitable parameters for electrolytic polishing of NiTi wires, in both the superelastic and shape memory states. The results indicate that electropolishing in a 3.5 mol•L -1 methanolic H 2 SO 4 electrolyte at 20°C can effectively reduce surface roughness, remove superficial nickel-rich layers and improve corrosion resistance for austenitic and martensitic NiTi alloys.

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Electropolishing and passivation of NiTi shape memory alloy

Cited by 114 publications

References 26 publications

SEM and EDS Characterization of Porous Coatings Obtained On Titaniumby Plasma Electrolytic Oxidation in Electrolyte Containing Concentrated Phosphoric Acid with Zinc Nitrate

SEM and EDS Characterization of Porous Coatings Obtained On Titaniumby Plasma Electrolytic Oxidation in Electrolyte Containing Concentrated Phosphoric Acid with Zinc Nitrate

Impact of Sterilisation and Strain Hardening in Drawing Process on Resistance to Electrochemical Corrosion of Wires Intended in Cardiology

Surface Characterization of NiTi Superelastic and Shape Memory Alloys After Electrolytic Polishing

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