Fabrication of bioactive titania coating on nitinol by plasma electrolytic oxidation

H. T. Siu; Hau Chung Man

doi:10.1016/j.apsusc.2013.03.008

Fabrication of bioactive titania coating on nitinol by plasma electrolytic oxidation

H. T. Siu, Hau Chung Man

Research output: Journal article publication › Journal article › Academic research › peer-review

50 Citations (Scopus)

Abstract

Surface modification was attempted on Nitinol (NiTi) by plasma electrolytic oxidation (PEO) in aqueous solutions of sodium sulphate and sodium hydroxide (Na2SO4-NaOH) using an AC power supply. A thick and porous oxide layer with micron-sized pores was formed on the Nitinol substrate, with the thickness of the oxide layer ranging from a few μm to over 10 μm, depending on the processing time. X-ray diffraction (XRD) analysis confirmed that the oxide formed was anatase. Potentiodynamic polarization tests in Hanks' solution showed that the corrosion resistance of PEO-coated Nitinol was much higher than that of the substrate. More importantly, the apatite-forming ability of the PEO-treated NiTi was found to be enhanced. This could be attributed to the anatase crystalline structure of the titanium oxide and the porous structure that facilitates the anchorage of the hydroxyapatite particles.

Original language	English
Pages (from-to)	181-187
Number of pages	7
Journal	Applied Surface Science
Volume	274
DOIs	https://doi.org/10.1016/j.apsusc.2013.03.008
Publication status	Published - 1 Jun 2013

Keywords

Apatite
Corrosion
Nickel Titanium (NiTi)
Plasma Electrolytic Oxidation (PEO)
Titanium Oxide

ASJC Scopus subject areas

Surfaces, Coatings and Films

More information

10.1016/j.apsusc.2013.03.008

Cite this

@article{0ead35a817e046d7b735e2635498cf52,

title = "Fabrication of bioactive titania coating on nitinol by plasma electrolytic oxidation",

abstract = "Surface modification was attempted on Nitinol (NiTi) by plasma electrolytic oxidation (PEO) in aqueous solutions of sodium sulphate and sodium hydroxide (Na2SO4-NaOH) using an AC power supply. A thick and porous oxide layer with micron-sized pores was formed on the Nitinol substrate, with the thickness of the oxide layer ranging from a few μm to over 10 μm, depending on the processing time. X-ray diffraction (XRD) analysis confirmed that the oxide formed was anatase. Potentiodynamic polarization tests in Hanks' solution showed that the corrosion resistance of PEO-coated Nitinol was much higher than that of the substrate. More importantly, the apatite-forming ability of the PEO-treated NiTi was found to be enhanced. This could be attributed to the anatase crystalline structure of the titanium oxide and the porous structure that facilitates the anchorage of the hydroxyapatite particles.",

keywords = "Apatite, Corrosion, Nickel Titanium (NiTi), Plasma Electrolytic Oxidation (PEO), Titanium Oxide",

author = "Siu, {H. T.} and Man, {Hau Chung}",

year = "2013",

month = jun,

day = "1",

doi = "10.1016/j.apsusc.2013.03.008",

language = "English",

volume = "274",

pages = "181--187",

journal = "Applied Surface Science",

issn = "0169-4332",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Fabrication of bioactive titania coating on nitinol by plasma electrolytic oxidation

AU - Siu, H. T.

AU - Man, Hau Chung

PY - 2013/6/1

Y1 - 2013/6/1

N2 - Surface modification was attempted on Nitinol (NiTi) by plasma electrolytic oxidation (PEO) in aqueous solutions of sodium sulphate and sodium hydroxide (Na2SO4-NaOH) using an AC power supply. A thick and porous oxide layer with micron-sized pores was formed on the Nitinol substrate, with the thickness of the oxide layer ranging from a few μm to over 10 μm, depending on the processing time. X-ray diffraction (XRD) analysis confirmed that the oxide formed was anatase. Potentiodynamic polarization tests in Hanks' solution showed that the corrosion resistance of PEO-coated Nitinol was much higher than that of the substrate. More importantly, the apatite-forming ability of the PEO-treated NiTi was found to be enhanced. This could be attributed to the anatase crystalline structure of the titanium oxide and the porous structure that facilitates the anchorage of the hydroxyapatite particles.

AB - Surface modification was attempted on Nitinol (NiTi) by plasma electrolytic oxidation (PEO) in aqueous solutions of sodium sulphate and sodium hydroxide (Na2SO4-NaOH) using an AC power supply. A thick and porous oxide layer with micron-sized pores was formed on the Nitinol substrate, with the thickness of the oxide layer ranging from a few μm to over 10 μm, depending on the processing time. X-ray diffraction (XRD) analysis confirmed that the oxide formed was anatase. Potentiodynamic polarization tests in Hanks' solution showed that the corrosion resistance of PEO-coated Nitinol was much higher than that of the substrate. More importantly, the apatite-forming ability of the PEO-treated NiTi was found to be enhanced. This could be attributed to the anatase crystalline structure of the titanium oxide and the porous structure that facilitates the anchorage of the hydroxyapatite particles.

KW - Apatite

KW - Corrosion

KW - Nickel Titanium (NiTi)

KW - Plasma Electrolytic Oxidation (PEO)

KW - Titanium Oxide

UR - http://www.scopus.com/inward/record.url?scp=84876905904&partnerID=8YFLogxK

U2 - 10.1016/j.apsusc.2013.03.008

DO - 10.1016/j.apsusc.2013.03.008

M3 - Journal article

SN - 0169-4332

VL - 274

SP - 181

EP - 187

JO - Applied Surface Science

JF - Applied Surface Science

ER -

Fabrication of bioactive titania coating on nitinol by plasma electrolytic oxidation

Abstract

Keywords

ASJC Scopus subject areas

More information

Other files and links

Fingerprint

Cite this