Nanostructure effect on the electrochemical response of titanium

• Autorzy: Sotniczuk A. , Zwolińska M. , Sozańska M. , Królikowski A. , Garbacz H.

Identyfikatory

DOI

10.15199/28.2016.6.6

Warianty tytułu

PL

Wpływ nanostruktury na właściwości elektrochemiczne tytanu

• Języki publikacji: EN

Abstrakty

EN

The purpose of this work was to investigate the influence of nanostructure on titanium corrosion resistance in physiological saline (0.9% NaCl). In order to obtain the nanostructure the titanium rod was processed through multiple hydrostatic extrusion (HE). Corrosion tests included electrochemical impedance (EIS) and potentiodynamic (PD) measurements. EIS tests were performed after 2 and 24 hours of immersion in 0.9% NaCl. Potentiodynamic measurements were carried out immediately after the last impedance test. Profilometric examination was used to check whether the samples were equally prepared for corrosion measurements. After corrosion tests a scanning electron microscope (SEM) was used to characterize the morphology of the surface. Corrosion tests revealed the positive influence of nanostructure on titanium corrosion resistance. Moreover, the differences observed were larger in the case of a shorter time of immersion in physiological saline. Hence, it might be surmised that the rate of the passivation process depends on titanium grain size. The microscopic characterization of the surfaces of samples after the corrosion test indicated differences in the surface morphology. The passive film formed on the nanocrystalline sample was more compact and homogenous than on the microcrystalline one. The different number of structural defects in micro- and nanocrystalline titanium might be the reason for the observed phenomena. Due to their higher energy, structural defects could be preferential sites for the nucleation of passive layers. Consequently, the rate of passivation should be higher for nanocrystalline materials. Furthermore, the high volume fraction of structural defects also explained the existence of more tight and uniform passive layer on the nanocrystalline titanium. Good corrosion resistance in physiological saline means that nanotitanium could be an attractive material for biomedical applications.

PL

Celem pracy była analiza wpływu nanostruktury na odporność korozyjną tytanu w roztworze soli fizjologicznej (0,9% NaCl). Zakres pracy obejmował badania korozyjne materiału mikrokrystalicznego i w stanie nanokrystalicznym. Nanokrystaliczny tytan uzyskano metodą wyciskania hydrostatycznego. Przedstawiono również opis budowy warstw pasywnych po przeprowadzonych próbach korozyjnych.

Słowa kluczowe

EN

corrosion; nanostructured titanium; biomedical application

PL

korozja; nanokrystaliczny tytan; aplikacje biomedyczne

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2016
• Tom: Vol. 37, nr 6
• Strony: 311--316
• Opis fizyczny: Bibliogr. 29 poz., fig., tab.

Twórcy

autor

Sotniczuk A.

• Faculty of Materials Science and Engineering, Warsaw University of Technology

autor

Zwolińska M.

• Faculty of Materials Science and Engineering, Warsaw University of Technology

autor

Sozańska M.

• Faculty of Materials Engineering and Metallurgy, Silesian University of Technology

autor

Królikowski A.

• Faculty of Chemistry, Warsaw University of Technology

autor

Garbacz H.

• Faculty of Materials Science and Engineering, Warsaw University of Technology

Bibliografia

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.