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Charakterystyka elektrochemiczna naruszonej mechanicznie warstwy tlenkowej na stopie tytanu Ti6A14V ELI

100%

Kierzkowska A. , Krasicka-Cydzik E.

2007

tom Vol. 7, nr 4(14)

26-33

W pracy charakteryzowano elektrochemiczne własności warstw tlenkowych na implantowym stopie tytanu Ti6A14V ELI powstałych w procesach: polerowania oraz anodowania. Oceniano także wpływ odkształceń plastycznych wywołanych gięciem na zachowanie in vitro obu warstw. Badania prowadzono po 1 i 37 dniach przechowywania w roztworze Ringera. Do oceny zachowania warstw tlenkowych zastosowano pomiary potencjałów korozyjnych, interpretację krzywych polaryzacyjnych oraz elektrochemiczną spektroskopię impedancyjną. Rezultaty badań wykazały różnice w zachowaniach naturalnej oraz anodowej warstwy-tlenkowej przy dążeniu do stanu "równowagi", odpowiadającego warunkom badań in vitro.

In this investigation, the behavior of oxide layers titanium alloy Ti6A14V arised during: anodizing and polishing was characterized in bending test. Influence of plastic deformations on both layers was estimated in vitro. Measurements were performed after 1 and 37 days immersion in Ringer's solution. The behavior of layers was characterized by electrochemical testing (anodizing polarization, EIS and corrosion potential). A measurement of corrosion potential, electrochemical impedance, spectroscopy and interpretation of polarization curves was used to estimate oxide layers. Results of investigation show differences between natural and anodic oxide layers. Bending gives positive influence on bioactivity.

Behavior of anodic layer in Ringer's solution on Ti6Al4V ELI alloy after bending

80%

Krasicka-Cydzik E. , Kierzkowska A. , Glazowska I.

2007

tom Vol. 28, nr 4

231-237

Purpose: Characterization of the electrochemical behavior of anodized implant rods made of the titanium alloy Ti6Al4V ELI after immersion in air-saturated Ringer's solution was presented in the paper. Design/methodology/approach: The anodized and deformed by bending at angle 20° specimens (dia 6 mm) were characterized electrochemically in two zones: the max tensile (I) and the max. compressive stress (II). Impedance spectra (EIS) and corrosion potential measurements were performed on 1, 6, 10 and 16th day after immersion in Ringer's solution. Findings: Bending caused an apparent decrease of the protective properties of the anodic layer, but the characteristic two-layer anodic film and the values of corrosion potentials were restored due to immersion in Ringer's solution. The regions of the compressive stresses show much stronger tendency to regenerate surface properties. Research limitations/implications: The electrochemical tests in Ringer's solution performed only in static conditions will be followed by fatigue tests in SBF. Practical implications: Results of the work are of great importance for surgical practice in the pre-operative stage of spinal surgery procedures. The explanation of the observed phenomena is proposed. Originality/value: Different stress zones formed on implant alloy during bending were described electrochemically. Results of studies evidenced that changes in the electrochemical behaviour in vitro in Ringer's solution are advantageous with regard to the protective properties of the investigated alloy.

The texture of a binary AI2O3-GeO2 gel system

71%

Kirszensztejn P. , Marciniak P. , Przekop R. , Szymkowiak A. , Kierzkowska A.

2006

tom Vol. 8, nr 2

115-117

A comprehensive comparative study of binary oxide systems obtained by the sol-gel chemistry has been made. Particular attention has been paid to the texture changes. Using germanium isopropoxide and aluminium isopropoxide, binary gels with mesoporous structure have been obtained. Binary gels show a monodispersive distribution and the major contribution to the pore volume comes from the pores of diameters similar to those in the pure alumina gel.