Original scientific paper

https://doi.org/10.17559/TV-20151021112657

SEM, EDS and XPS analysis of nanostructured coating formed on NiTi biomaterial alloy by Plasma Electrolytic Oxidation (PEO)

Krzysztof Rokosz ; Division of BioEngineering and Surface Electrochemistry, Faculty of Mechanical Engineering, Koszalin University of Technology, Racławicka 15-17, 75-620 Koszalin, Poland
Tadeusz Hryniewicz ; Division of BioEngineering and Surface Electrochemistry, Faculty of Mechanical Engineering, Koszalin University of Technology, Racławicka 15-17, 75-620 Koszalin, Poland
Steinar Raaen ; Department of Physics, Norwegian University of Science and Technology (NTNU), Realfagbygget E3-124 Høgskoleringen 5, NO 7491 Trondheim

Abstract

Plasma Electrolytic Oxidation (PEO) of NiTi alloy was studied in the electrolyte consisting generally of concentrated orthophosphoric acid with an addition of copper II nitrate. The PEO process was used to obtain a nanostructured coating on the Nitinol surface. The surface layer analyses methods, such as scanning electron microscopy (SEM) with the energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS), allowed determining the structure and composition of the most expected coatings and revealing the conditions for obtaining them. It was found that the porous PEO coating obtained in the electrolyte containing copper nitrate in an amount higher than 1,6 mol/L consists mainly of copper-titanium-nickel phosphates. Moreover, in comparison with matrix, the emergence of carcinogenic nickel appearing in the coating fortunately appears in very small quantities, i.e. below 1 at%.

Keywords

biomaterials; coatings; electrochemical techniques; energy dispersive X-ray spectroscopy (EDS); NiTi alloy; X-ray photoelectron spectroscopy (XPS)

Hrčak ID:

174716

URI

https://hrcak.srce.hr/174716

Publication date:

10.2.2017.

Article data in other languages: croatian

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