Electrochemical Impedance Spectroscopy and Corrosion Resistance of SiO2 Coated CpTi and Ti-6Al-7Nb Alloy

Basiaga, Marcin; Paszenda, Z.; Walke, W.; Karasiński, Paweł; Marciniak, J.

doi:10.1007/978-3-319-06596-0_39

Cited by 19 publications

(19 citation statements)

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“…The impedance spectra were analysed with the use of equivalent circuits, and their resultant impedances described ( Figure 4 and Table 2). The best conformity between the model spectra and the experimental spectra obtained from the artificial plasma was achieved in the following circuits: 5,6,11 • circuit indicating the existence of a double layer, where R s is the resistance of the artificial plasma, CPE p is a constant phase element modelling the capacity of the surface zone of the material, with a highly developed surface, R p -an element modelling the solution resistance in this zone, R ct and CPE dlresistance and capacity of the oxide layer (Figure 4a), • circuit including also CPE pore -an element representing the capacity of a double (porous) layer and an R pore resistor representing the electrolytic resistance in the pores (Figure 4b). …”

Section: Resultsmentioning

confidence: 92%

“…The development and verification of conditions for coating cpTi with layers of TiO 2 and SiO 2 characterized by high hemocompatibility was the topic of previous papers published by the authors. [5][6][7] The safety of a medical device involving contact with blood is also related to the necessity of observing the appropriate procedures, preventing the transfer of pathogenic microorganisms into the human body. Such procedures are aimed at the removal and efficient elimination of microorganisms and the obtaining of sterile medical devices complying with certain specified quality requirements.…”

Section: Introductionmentioning

confidence: 99%

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The effect of EO and steam sterilization on the mechanical and electrochemical properties of titanium Grade 4

Basiaga¹,

Walke²,

Paszenda³

et al. 2016

Mater. Tehnol.

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Currently, various modifications to surfaces are made more and more frequently in order to improve implants' haemocompatibility. The main criterion determining the applicability of the respective surface-modification method is obtaining a product featuring suitable functional properties. These properties depend to a great extent on the corrosion resistance in the environment of human blood. Subject-matter literature does not devote much attention to the sterilisation process for titanium and cpTi alloys with surface modifications. A problem that still remains unsolved is the selection of a proper test showing the full characteristics of their behaviour contact with a blood environment during the time that the implant is used. Therefore, the authors of this study made an attempt to evaluate the impact of medical sterilisation methods, i.e., the ethylene oxide anodic oxide and SiO2 layer, by means of the sol-gel method. The efficiency of the suggested technology for oxide layer application was evaluated on the basis of mechanical and electrochemical tests. Sterilisation in ethylene oxide and steam had a favourable influence on the electrochemical and mechanical properties of cpTi, irrespective of the method of surface preparation. In order to simulate real conditions, the tests were performed in artificial plasma at a temperature of T = 37 ± 1°C and pH = 7.0 ± 0.2. The results proved the diversification of electrochemical properties of the oxide layers, depending on the technological parameters of its application. The suggestion of proper variants of the surface modification with the application of electrochemical and chemical methods is of long-range importance and will contribute to the development of technological conditions with specific parameters for the creation of oxide layers on metallic implants made of cpTi. Keywords: cpTi (Grade 4), SiO 2 , TiO 2 , mechanical properties, electrochemical properties Vedno pogosteje se opravljajo razli~ne modifikacije povr{ine, da bi se izbolj{ala hemokompatibilnost vsadkov. Glavni kriterij, ki dolo~a uporabnost metode za modifikacijo povr{ine je, da proizvod poka`e primerne funkcionalne lastnosti. Te lastnosti so v veliki meri odvisne od korozijske odpornosti v~love{ki krvi. Obstoje~a literatura ne posve~a velike pozornosti postopku sterilizacije titana in cpTi zlitin z modificirano povr{ino. Problem, ki {e ni re{en, je izbira primernega preizkusa, ki bi pokazal vse zna~ilnosti o obna{anju stika s krvjo med uporabo vsadka. Zato so avtorji v tej {tudiji poizkusili oceniti vpliv medicinskih metod sterilizacije, kot je etilen oksid anodni oksid in SiO2 plast izdelano s pomo~jo metode sol-gel. Predlagana tehnologija uporabe oksidnega sloja je bila ocenjena z mehanskimi in elektrokemijskimi preizkusi. Sterilizacija v etilen oksidu in pari je imela ugodne vplive na elektrokemijske in mehanske lastnosti cpTi, ne glede na na~in priprave povr{ine. Za simulacijo realnih pogojev so bili preizkusi izvr{eni v umetni plazmi pri temperaturi T = 37 ± 1°C in pH = 7,0 ± 0,2. Dobljeni rezu...

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

The effect of EO and steam sterilization on the mechanical and electrochemical properties of titanium Grade 4

Basiaga¹,

Walke²,

Paszenda³

et al. 2016

Mater. Tehnol.

Self Cite

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“…The symbols in Figure 9c signify the following: CPE pore -capacity of the surface sphere of the material with a high level of surface extension (porous), R pore -electrolyte resistance in pores, CPE dl -capacity of the double layer, R ct -charge-transfer resistance at the phase boundary (it characterises the speed of the corrosive process), C dl -capacity of the double layer, CPE Pcapacity of the passive layer (oxide), R P -passive (oxide) layer resistance ( Table 2). [9][10][11] …”

Section: Results and Disscusionmentioning

confidence: 99%

“…The remaining starting ingredients contained ethyl alcohol (EtOH) and water. 1,9 In the case of anodic oxidation a layer of TiO 2 was applied in an electrolyte based on phosphoric acid and sulphuric acid (TitanColor by POLIGRAT GmbH) at a potential of 90 V. Previous studies conducted by the authors made it possible to select the most favourable parameters, both for the sol-gel technique and for the anodic oxidation. 10,11 Next, the prepared samples were sterilised with ethylene oxide and steam.…”

Section: Methodsmentioning

confidence: 99%

“…The positive results of already-published papers by the authors regarding the assessment of the usefulness of the surface-layer modification processes involving anodic oxidation, as well as the creation of a SiO 2 layer with the sol-gel method, enabled the selection of the most beneficial parameters for the process. 1,[9][10][11] An analysis of the literature data indicates that reducing the number of failed bloodsystem disease treatments depends to a large extent on the electrochemical stability of the surface layer under the medical sterilisation conditions. Therefore, this article evaluates the effects of steam and ethylene oxide sterilisation processes on the physical and chemical properties of the surface layer of the Ti-6Al-7Nb (Ti67) alloy.…”

Section: Introductionmentioning

confidence: 99%

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Physicochemical properties of a Ti67 alloy after EO and steam sterilization

Walke¹,

Basiaga²,

Paszenda³

et al. 2016

Mater. Tehnol.

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The techniques of surface modification play a significant role in forming the physical and chemical properties of titanium and its alloys. Among many techniques for the layers' application, chemical and electrochemical methods are particularly interesting, as they make it possible to control the process of depositing thin layers of the material and modifying their properties through a change of reagents and the parameters of the deposition process. A special advantage the methods bring is the possibility to obtain layers that offer a perfect coating for geometrically complex surfaces. Apart from improved haemocompatibility, a significant issue related to the creation of the layers is also a proper set of physicochemical properties. Therefore, the study comprised tests of the physicochemical properties of oxide layers deposited on the surface of samples taken from a Ti-6Al-7Nb alloy. The samples were subject to various surface modifications, i.e., grinding, electrolytic polishing, a SiO2 layer was applied using the sol-gel method and TiO2 by means of an anodic oxide and medical sterilisation methods (EO and steam). The corrosion-resistance tests were performed on the basis of registered anodic polarisation curves and the Stern method. Electrochemical Impedance Spectroscopy (EIS) was also used in order to evaluate the phenomena taking place on the surface of the tested alloys. As a part of the evaluation of the mechanical properties of surface layers created in such a way, hardness tests and tests of the adhesion of those layers to a metallic substrate were made. Measurements of the instrumental hardness were made with the Oliver & Pharr method, whereas the adhesion of the layers to the substrate was measured by means of a scratch test. The suggestion of proper surface treatment variants has perspective significance and will help to develop the technological conditions with specified parameters of the oxide coating's creation on the surface of metallic implants. Keywords: Ti-6Al-7Nb (Ti67) alloy, sol-gel, anodic oxide, scratch-test, nanohardness, EIS, potentiodynamic method Tehnike modifikacije povr{ine igrajo pomembno vlogo pri doseganju fizikalnih in kemijskih lastnosti titana in njegovih zlitin. Med mnogimi tehnikami uporabe tankih plasti so {e posebej zanimive kemijske in elektrokemijske metode, ker omogo~ajo kontrolo postopka depozicije tanke plasti materiala in spreminjanje njihovih lastnosti, z zamenjavo reagentov in parametrov procesa depozicije. Posebna prednost, ki jo omogo~ajo metode, je mo`nost izdelave plasti, ki omogo~ajo popolno prevleko pri geometrijsko kompleksnih povr{inah. Poleg izbolj{ane hemokompatibilnosti je pomembno vpra{anje povezano z nastankom plasti in tudi z doseganjem ustreznih fizikalno kemijskih lastnosti. Zato je {tudija obsegala preizkuse fizikalno kemijskih lastnosti oksidnih plasti, po depoziciji na povr{ini vzorcev iz Ti-6Al-7Nb zlitine. Na vzorcih so bile opravljene razli~ne modifikacije povr{ine: bru{enje, elektrolitsko poliranje, SiO2 plast, izdelana po sol-gel postopku in T...

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Mechanical properties of atomic layer deposition (ALD) TiO₂ layers on stainless steel substrates

Basiaga

Staszuk

Walke

et al. 2016

Materialwissenschaft Werkst

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Surface modification techniques play a major role in shaping the physicochemical properties of 316 LVM steel used for implants. The utilised methods of surface layer modification must ensure repeatability and uniformity of the physical and chemical properties. The structure and chemical composition of 316 LVM steel implants can be modified using various methods, among which anode oxidation and sol-gel methods are dominant. One of the more important aspects related to maintaining implants (e.g. vessel stents) is ensuring the maintenance of their geometric characteristics along their entire length, which some methods cannot guarantee. For this reason, the most appropriate technique of surface modification in this context appears to involve atomic layer deposition (ALD). Improved biocompatibility is also directly related to ensuring an appropriate set of mechanical properties for the deposited layer. Thus, the study attempted to assess the mechanical properties of the TiO 2 layers on a 316 LVM steel substrate, deposited using an atomic layer depositionbased method.Keywords: 316 LVM / TiO 2 / atomic layer deposition / scratch test / nanohardness / ellipsometry / atomic force microscopy (AFM)Oberflächenmodifizierungstechniken spielen eine wichtige Rolle bei der Gestaltung der physikalisch-chemischen Eigenschaften von 316 LVM Stahl für Implantate. Die eingesetzten Methoden der Oberflächenschichtmodifikation müssen Wiederholbarkeit und Einheitlichkeit der physikalischen und chemischen Eigenschaften sicherstellen. Die Struktur und die chemische Zusammensetzung des 316 LVM Stahlimplantats können durch verschiedene Verfahren, unter anderem durch Anodenoxidation und Sol-Gel-Verfahren, signifikant modifiziert werden. Einer der wichtigsten Aspekte zur Aufrechterhaltung der Funktionalität von Implantaten (z. B. Gefäß-prothesen) ist der Erhalt ihrer geometrischen Eigenschaften entlang der gesamten Länge, die einige der Methoden nicht garantieren können. Aus diesem Grund scheint die geeignetste Technik der Oberflächenmodifikation auf der Atomlagenabscheidung (ALD) zu basieren. Verbesserte Biokompatibilität ist auch in direktem Zusammenhang mit der Gewährleistung angemessener mechanischer Eigenschaften der abgeschiedenen Schicht zu sehen. Somit versucht diese Studie, die

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Electrochemical Impedance Spectroscopy and Corrosion Resistance of SiO2 Coated CpTi and Ti-6Al-7Nb Alloy

Cited by 19 publications

References 4 publications

The effect of EO and steam sterilization on the mechanical and electrochemical properties of titanium Grade 4

The effect of EO and steam sterilization on the mechanical and electrochemical properties of titanium Grade 4

Physicochemical properties of a Ti67 alloy after EO and steam sterilization

Mechanical properties of atomic layer deposition (ALD) TiO₂ layers on stainless steel substrates

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Electrochemical Impedance Spectroscopy and Corrosion Resistance of SiO2 Coated CpTi and Ti-6Al-7Nb Alloy

Cited by 19 publications

References 4 publications

The effect of EO and steam sterilization on the mechanical and electrochemical properties of titanium Grade 4

The effect of EO and steam sterilization on the mechanical and electrochemical properties of titanium Grade 4

Physicochemical properties of a Ti67 alloy after EO and steam sterilization

Mechanical properties of atomic layer deposition (ALD) TiO2 layers on stainless steel substrates

Contact Info

Product

Resources

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Mechanical properties of atomic layer deposition (ALD) TiO₂ layers on stainless steel substrates