EP4332278A1 - Verfahren zur elektrochemischen oberflächenbehandlung von biomedizinischen produkten aus titan oder ti-basierten legierungen - Google Patents
Verfahren zur elektrochemischen oberflächenbehandlung von biomedizinischen produkten aus titan oder ti-basierten legierungen Download PDFInfo
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- EP4332278A1 EP4332278A1 EP22193733.7A EP22193733A EP4332278A1 EP 4332278 A1 EP4332278 A1 EP 4332278A1 EP 22193733 A EP22193733 A EP 22193733A EP 4332278 A1 EP4332278 A1 EP 4332278A1
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- biomedical product
- reline
- glyceline
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 48
- 239000000956 alloy Substances 0.000 title claims abstract description 48
- 238000004381 surface treatment Methods 0.000 title claims abstract description 44
- 239000010936 titanium Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 30
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 28
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 238000011282 treatment Methods 0.000 claims abstract description 76
- 239000003792 electrolyte Substances 0.000 claims abstract description 35
- 238000005530 etching Methods 0.000 claims abstract description 23
- 238000004140 cleaning Methods 0.000 claims abstract description 11
- 238000007654 immersion Methods 0.000 claims abstract description 4
- 239000007943 implant Substances 0.000 claims description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 5
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 5
- 238000007605 air drying Methods 0.000 claims description 2
- 238000005238 degreasing Methods 0.000 claims description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 25
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 24
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 22
- 238000012545 processing Methods 0.000 description 17
- 239000002904 solvent Substances 0.000 description 12
- 239000004202 carbamide Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 11
- 239000001763 2-hydroxyethyl(trimethyl)azanium Substances 0.000 description 10
- 235000019743 Choline chloride Nutrition 0.000 description 10
- SGMZJAMFUVOLNK-UHFFFAOYSA-M choline chloride Chemical compound [Cl-].C[N+](C)(C)CCO SGMZJAMFUVOLNK-UHFFFAOYSA-M 0.000 description 10
- 229960003178 choline chloride Drugs 0.000 description 10
- 230000005496 eutectics Effects 0.000 description 10
- 230000003746 surface roughness Effects 0.000 description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 8
- 238000005498 polishing Methods 0.000 description 8
- 238000007788 roughening Methods 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 238000002156 mixing Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000006056 electrooxidation reaction Methods 0.000 description 5
- 239000000374 eutectic mixture Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000002378 acidificating effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229930003270 Vitamin B Natural products 0.000 description 3
- 235000019156 vitamin B Nutrition 0.000 description 3
- 239000011720 vitamin B Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000000370 acceptor Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 2
- YONPGGFAJWQGJC-UHFFFAOYSA-K titanium(iii) chloride Chemical class Cl[Ti](Cl)Cl YONPGGFAJWQGJC-UHFFFAOYSA-K 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- -1 H2SO4 Chemical class 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 229910003074 TiCl4 Inorganic materials 0.000 description 1
- LCKIEQZJEYYRIY-UHFFFAOYSA-N Titanium ion Chemical compound [Ti+4] LCKIEQZJEYYRIY-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000338 in vitro Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229940127554 medical product Drugs 0.000 description 1
- 239000002073 nanorod Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 150000003839 salts Chemical group 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- WFHFLRDYWXEKEC-UHFFFAOYSA-J tetrachlorotitanium;urea Chemical class [Cl-].[Cl-].[Cl-].[Cl-].[Ti+4].NC(N)=O WFHFLRDYWXEKEC-UHFFFAOYSA-J 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000035899 viability Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
- C25F3/08—Etching of refractory metals
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/16—Polishing
- C25F3/22—Polishing of heavy metals
- C25F3/26—Polishing of heavy metals of refractory metals
Definitions
- the invention relates to the technical field of electrochemical surface treatment of biomedical products based on Ti and Ti-alloys.
- Ti and Ti-alloys remain the most common materials for the manufacture of prostheses and implants.
- titanium and its alloys cannot meet all clinical requirements without a special pretreatment of their surfaces. Therefore, preliminary surface treatment (modification) of biomedical Ti-based alloys is often performed in order to improve the biological, chemical, and physical-mechanical properties.
- preliminary surface treatment (modification) of biomedical Ti-based alloys is often performed in order to improve the biological, chemical, and physical-mechanical properties.
- the common types of these surface modifications are associated with mechanical, laser, chemical and electrochemical surface treatments and also with combinations of these techniques.
- Electrochemical surface treatment method is generally considered as one of the most efficient, convenient and adaptable technique for improvement of the physical-mechanical surface properties of titanium and titanium-based alloys [1].
- the process of electrochemical surface treatment of titanium alloys is carried out in electrolytes based on concentrated acids (e.g., H 2 SO 4 , HF, H 3 PO 4 , HNO 3 , HClO 4 , etc.) and alcohols mixtures.
- concentrated acids e.g., H 2 SO 4 , HF, H 3 PO 4 , HNO 3 , HClO 4 , etc.
- alcohols mixtures e.g., ethanol, etc.
- These electrolytes are environmentally hazardous, toxic and sometimes explosive. It is obvious that the use of highly concentrated acidic electrolytes is not only environmentally unsafe, but also dangerous for humans. In this regard, the search for environmentally friendly and safety alternatives to the classical acidic electrolytes for electrochemical surface treatment of Ti and Ti-alloys is important and relevant [2].
- Ethaline has been proposed as an alternative to the most-common acidic electrolytes for the electropolishing of titanium alloys [3].
- Ethaline has several disadvantages, such as poor reproduction of the electropolishing results, which in some cases leads to the subpar quality of the processed surfaces, and insufficient effectivity of the process.
- the aim of this invention is to provide electrolytes for electrochemical surface treatment of titanium alloys prostheses and implants that are environmentally friendly, highly efficient and gives a reliably repeatable results, that are also cheap, easy to prepare, easily biodegradable.
- This invention relates to the surface modification of biomedical Ti and Ti-alloys in deep eutectic solvent Reline or Glyceline at room temperatures without additional heating or cooling.
- Reline is a eutectic mixture of choline chloride (vitamin B 4) and urea in molar ratio of components 1:2, respectively.
- Glyceline is a eutectic mixture of choline chloride (vitamin B 4) and glycerol in molar ratio of components 1:2, respectively.
- the formation of viscous near-electrode surface layer plays key role due to the crucial place of diffusion control in etching and polishing processes. It has been found out that a thickness and density of the near-electrode viscous layer suitable for high processing efficiency can be achieved for deep eutectic solvents with higher viscosity (density). The more viscous the electrolyte, the faster the formation of a near-electrode layer of suitable thickness and density is achieved. Moreover, the higher the viscosity and density of the electrolyte the more stable surface layer is formed.
- the mixtures such as Reline or Glyceline that have relatively high density and also high viscosity at the room temperature are eminently suitable to be used as electrolytes for the electrochemical surface treatment according to this invention.
- the density of Reline is 1.24 g cm -3 and viscosity is 750 cP (at 25 °C)
- the density of Glyceline is 1.19 g cm -3
- viscosity is 259 cP (at 25 °C) (for comparison, the same parameters for Ethaline is 1.12 g cm -3 and 37 cP, respectively).
- the second important factor which can increase the efficiency of electropolishing or electrochemical etching, is a change in the mechanism of electrochemical processes (a decrease in the activation energy due to a change in the nature of intermediate particles, a decrease in the number of stages in the overall electrochemical reaction, etc.).
- the deep eutectic solvents Reline and Glyceline which contains urea and glycerol, except ethylene glycol that component of Ethaline, will provide formation of the intermediate complexes with different nature (urea and glycerol Ti - containing complexes, except ethylene glycol Ti - containing complexes in Ethaline).
- the method for electrochemical surface treatment of biomedical products made of titanium or Ti-based alloys according to the present invention comprises the steps:
- Subsequent cleaning from electrolyte residuals after proposed electrochemical treatment can be performed in water ultrasonic bath during 5 to 15 min. and air drying until the water has completely evaporated.
- Proposed electrochemical method of surface treatment of biomedical Ti and Ti-alloys in Reline or Glyceline is a highly efficient and eco-friendly technic for the surface properties enhancement.
- This kind of treatment allows improving the surface chemistry, morphology, topography and such surface properties as wettability, corrosion resistance and bio-compatibility, which is very important for Ti and Ti-alloys for biomedical application.
- Reline has melting point 12 °C, so at room temperatures it is a colorless transparent liquid with numerous attractive characteristics, such as cheapness, safety, non-toxicity, non-volatility, thermal stability, non-flammability, sustainability, and biodegradability. Melting point of Glyceline is -44 °C, thus, at all temperatures higher than -44°C this eutectic mixture is liquid.
- Reline and Glyceline possess noticeable benefits in comparison with ordinary acidic electrolytes, such as high effectivity, eco-friendliness, low coast, resource-saving, low corrosivity towards steel equipment and human health safeness. Moreover, Reline and Glyceline have significant advantages as electrolytes for the electrochemical treatment in comparison with Ethaline, such as higher density and viscosity, higher biodegradability and lower price. Additionally, Reline is characterized by significantly lower hygroscopicity in comparison with Ethaline.
- the key factor for the biodegradability of deep eutectic solvents is the neutrality of each hydrogen bond donor and acceptor, which produces a natural DESs mixture and can be easily metabolized by bacteria and fungi.
- Biodegradability of Glyceline reaches 100 % in 28 days, Reline reaches 97.1 % in 28 days. In comparison, biodegradability of Ethaline is 81.9 % in 28 days. Thus, from ecological point of view, the industrial use of Reline or Glyceline is preferable.
- Glyceline and Reline are cheaper in comparison with Ethaline.
- Table 1 Comparative characteristic of physicochemical and bio properties of deep eutectic solvents Glyceline, Reline and Ethaline. Eutectic mixture Density ( ⁇ ), g cm -3 Viscosity ( ⁇ ), cP Biodegradability, % in 28 days Glyceline 1.19 259 95.9-100 Reline 1.24 750 97.1 Ethaline 1.12 37 81.9
- the mechanism of electrochemical treatment of Ti and Ti-based alloys in Ethaline related with electrooxidation of Ti and formation one-dimensional Ti-glycolate complexes.
- the mechanism of electrochemical treatment of pure titanium and Ti-alloys in Glyceline and Reline is different from that, which observed for Ethaline.
- Electrooxidation of Ti in glycerol enriched media probably takes place with formation of Ti-glycerolate complexes like intermediate state for Ti 2+ , Ti 3+ stabilization before complete oxidation to the Ti 4+ .
- the possibility of existence of Ti - glycerolate complexes in glycerol containing media is discussed previously in [4, 5].
- the proposed electrochemical treatment of bio-medical Ti and Ti-alloys in Reline or Glyceline can be realized in two different modes: potentiostatic (constant potential) and galvanostatic (constant current).
- Galvanostatic treatment is recommended for biomedical protheses and implants with well-known surface area and potentiostatic one for biomedical products with very complex shape, for which accurate measurement of the surface area is difficult or impossible.
- the procedure of galvanostatic surface treatment realizes in two electrode system, where working electrode is Ti or Ti-alloy prosthesis or implant and counter electrode is Pt-grid or graphite with surface area comparable to the workpiece.
- Reline or Glyceline is used as an electrolyte for surface treatment.
- the volume of Reline/Glyceline can be variated depending on size of titanium bio-medical product.
- the optimal time of treatment (5-60 min.) can be variated depending on initial state of Ti or Ti-alloy product (initial roughness, contamination, etc.).
- prosthesis or implant must be located in electrochemical cell (bath) coaxially relative to the counter electrode, in this case the distance between all points of the workpiece and the counter electrode is approximately the same and current distribution uniform.
- Electrochemical surface treatment must be carried out at temperature interval 15-40 °C. At temperatures below 15 °C it is possible local crystallization processes, which will change the electrolyte composition; at temperatures higher than 40 °C the conditions of the dissolution process will be changed from mass transfer controlled, which will lead to a significant deterioration in the processing result.
- potentiostatic surface treatment treatment under constant potential, voltage
- working electrode is Ti or Ti-alloy prosthesis or implant
- counter electrode is Pt-grid or graphite with surface area comparable to the workpiece
- reference electrode is Ag - wire, the electrode relative to which the potential in electrochemical cell is measured and controlled.
- potentiostatic treatment can be used the same like for galvanostatic treatment volume of electrolyte, temperatures and time of treatment depending on desired result of surface morphology.
- the potential (E [V]) during the treatment procedure controls by potentiostat.
- etching potentials 1-5 V; for electropolishing is 6-30 V.
- potentiostatic mode prosthesis or implant must be located in electrochemical cell (bath) coaxially relative to the counter electrode the same like for potentiostatic treatment.
- the volume of electrolyte (Reline or Glyceline) is arbitrary depending on size and shape of the workpiece.
- Table 3 Summarized parameters of electrochemical processing of Ti and Ti-based alloys in Reline and Glyceline. t/°C ⁇ /min.
- 3D printed implants made of Ti-6AI-4V alloy - electrochemical treatment in Reline.
- Reline was prepared by mixing of choline chloride (ChCI) and urea at a molar ratio of components 1:2 (ChCl : urea). The mixing was carried out at 250 rpm and 70 °C for 2 hours until a homogenous transparent colorless liquid was formed. After cooling electrolyte was ready for electrochemical using.
- ChCI choline chloride
- urea a molar ratio of components 1:2
- Ti-6AI-4V alloy implants were degreased and cleaned before electrochemical processing. Ti-alloy details were immersed in ultrasonic water bath with 1 weight % of caustic soda for 5 min. at 40 °C. Afterwards the residues of the cleaning composition were thoroughly rinsed off with water. After drying in hot air flow Ti-6AI-4V alloy implants were ready for electrochemical treatment.
- Electrochemical treatment procedure - galvanostatic mode
- Galvanostatic electrochemical surface treatment of 3D printed Ti-6AI-4V alloy implants in Reline was carried out in a two-electrode thermostated cell using potentiostat Metrohm Autolab PGSTAT302N (Switzerland). Ti-6AI-4V alloy implants served as working electrodes, Pt-grid with surface area comparable to the workpiece was an auxiliary electrode. Electrochemical surface treatment was done in galvanostatic mode at two current densities (5 mA cm -2 and 25 mA cm -2 ). The surface area of 3D printed Ti-6AI-4V alloy implants was 4 cm 2 . Thus, processing currents were 0.04 A and 0.12 A, respectively.
- the suitable volume of Reline for treatment of implants with mentioned surface area is 120 ml. The temperature during treatment was kept at a constant value of 25 °C using a thermostat Julabo model ME v.2 (Germany). The duration of electrochemical treatment was 20 min. for each implant.
- RMS surface roughness parameter
- Electrochemical treatment procedure - potentiostatic mode
- Potentiostatic electrochemical surface treatment of 3D printed Ti-6AI-4V alloy implants in Reline was carried out in a three-electrode thermostated cell using potentiostat Metrohm Autolab PGSTAT302N (Switzerland).
- Ti-6AI-4V alloy implants served as working electrodes, Pt-grid with surface area comparable to the workpiece was an auxiliary electrode and Ag-wire was used as a pseudo-reference electrode.
- Electrochemical surface treatment was done in potentiostatic mode at two chosen potentials (4 V and 15 V).
- the surface area of 3D printed Ti-6AI-4V alloy implants was 4 cm 2 .
- the suitable volume of Reline for treatment of implants with mentioned surface area is 120 ml.
- the temperature during treatment was kept at a constant value of 25 °C using a thermostat Julabo model ME v.2 (Germany).
- the duration of electrochemical treatment was 20 min. for each implant.
- RMS parameter the roughness of the implant surfaces was measured.
- RMS is calculated as the Root Mean Square of a surfaces measured microscopic peaks and valleys.
- the RMS values for potentiostatic treatment in Reline were 1410 nm and 175 nm for potentials of treatment 5 V and 30 V, respectively.
- RMS parameter is 497 nm.
- 3D printed implant made of Ti-6AI-4V alloy - electrochemical treatment in Glyceline.
- Glyceline was prepared by mixing of choline chloride (ChCI) and glycerol at a molar ratio of components 1:2 (ChCI : glycerol). The mixing was carried out at 400 rpm and 70 °C for 1 hour until a homogenous transparent colorless liquid was formed. After cooling electrolyte was ready for electrochemical treatment of Ti-alloy implants.
- ChCI choline chloride
- glycerol glycerol
- Ti-6AI-4V alloy implants were degreased and cleaned before electrochemical processing. Ti-alloy details were immersed in ultrasonic water bath with 1 weight % of caustic soda for 5 min. at 40 °C. Afterwards the residues of the cleaning composition were thoroughly rinsed off with water. After drying in hot air flow Ti-6AI-4V alloy implants were ready for electrochemical treatment.
- Electrochemical treatment procedure - galvanostatic mode
- Galvanostatic electrochemical surface treatment of 3D printed Ti-6AI-4V alloy implants in Glyceline was carried out in a two-electrode thermostated cell using potentiostat Metrohm Autolab PGSTAT302N (Switzerland). Ti-6AI-4V alloy implants served as working electrodes, Pt-grid with surface area comparable to the workpiece was an auxiliary electrode. Electrochemical surface treatment was done in galvanostatic mode at two current densities (5 mA cm -2 and 25 mA cm -2 ). The surface area of 3D printed Ti-6AI-4V alloy implants was 4 cm 2 . Thus, processing currents were 0.04 A and 0.12 A, respectively.
- the suitable volume of Glyceline for treatment of implants with mentioned surface area is 120 ml. The temperature during treatment was kept at a constant value of 25 °C using a thermostat Julabo model ME v.2 (Germany). The duration of electrochemical treatment was 20 min. for each implant.
- RMS parameter The result of electrochemical treatment in Glyceline under galvanostatic conditions was evaluated by measuring the surface roughness (RMS parameter).
- RMS is calculated as the Root Mean Square of a surfaces measured microscopic peaks and valleys.
- the RMS values for galvanostatic surface treatment in Glyceline were 1245 nm and 226 nm for current densities of treatment 5 mA cm -2 and 25 mA cm -2 , respectively.
- RMS parameter is 497 nm.
- Electrochemical treatment procedure - potentiostatic mode
- Potentiostatic electrochemical surface treatment of 3D printed Ti-6AI-4V alloy implants in Glyceline was carried out in a three-electrode thermostated cell using potentiostat Metrohm Autolab PGSTAT302N (Switzerland). Ti-6AI-4V alloy implants served as working electrodes, Pt-grid with surface area comparable to the workpiece was an auxiliary electrode and Ag-wire was used as a pseudo-reference electrode. Electrochemical surface treatment was done in potentiostatic mode at two chosen potentials (4 V and 15 V). The surface area of 3D printed Ti-6AI-4V alloy implants was 4 cm 2 . The suitable volume of Glyceline for treatment of implants with mentioned surface area is 120 ml. The temperature during treatment was kept at a constant value of 25 °C using a thermostat Julabo model ME v.2 (Germany). The duration of electrochemical treatment was 20 min. for each implant.
- RMS parameter The result of electrochemical treatment in Glyceline under potentiostatic conditions was evaluated by measuring the surface roughness (RMS parameter).
- RMS is calculated as the Root Mean Square of a surfaces measured microscopic peaks and valleys.
- the RMS values for potentiostatic surface treatment in Glyceline were 1280 nm and 220 nm for potentials of treatment 5 V and 30 V, respectively.
- RMS parameter is 497 nm.
- 3D printed implant made of Ti-6AI-4V alloy - electrochemical treatment in Ethaline.
- Ethaline was prepared by mixing of choline chloride (ChCI) and ethylene glycol at a molar ratio of components 1:2 (ChCI : Ethgl). The mixing was carried out at 300 rpm and 70 °C for 1 hour until a homogenous transparent colorless liquid was formed. After cooling electrolyte was ready for electrochemical treatment of Ti-alloy implants.
- ChCI choline chloride
- Ethgl ethylene glycol
- Ti-6AI-4V alloy implants were degreased and cleaned before electrochemical processing. Ti-alloy details were immersed in ultrasonic water bath with 1 weight % of caustic soda for 5 min. at 40 °C. Afterwards the residues of the cleaning composition were thoroughly rinsed off with water. After drying in hot air flow Ti-6AI-4V alloy implants were ready for electrochemical treatment.
- Electrochemical treatment procedure - galvanostatic mode
- Galvanostatic electrochemical surface treatment of 3D printed Ti-6AI-4V alloy implants in Ethaline was carried out in a two-electrode thermostated cell using potentiostat Metrohm Autolab PGSTAT302N (Switzerland). Ti-6AI-4V alloy implants served as working electrodes, Pt-grid with surface area comparable to the workpiece was an auxiliary electrode. Electrochemical surface treatment was done in galvanostatic mode at two current densities (5 mA cm -2 and 25 mA cm -2 ). The surface area of 3D printed Ti-6AI-4V alloy implants was 4 cm 2 . Thus, processing currents were 0.04 A and 0.12 A, respectively.
- the suitable volume of Ethaline for treatment of implants with mentioned surface area is 120 ml. The temperature during treatment was kept at a constant value of 25 °C using a thermostat Julabo model ME v.2 (Germany). The duration of electrochemical treatment was 20 min. for each implant.
- the result of electrochemical treatment in Ethaline under galvanostatic conditions was also evaluated by comparison of the roughness of the samples before and after electrochemical treatment.
- the measured parameters RMS the Root Mean Square of a surfaces measured microscopic peaks and valleys
- Electrochemical treatment procedure - potentiostatic mode
- Potentiostatic electrochemical surface treatment of 3D printed Ti-6AI-4V alloy implants in Ethaline was carried out in a three-electrode thermostated cell using potentiostat Metrohm Autolab PGSTAT302N (Switzerland). Ti-6AI-4V alloy implants served as working electrodes, Pt-grid with surface area comparable to the workpiece was an auxiliary electrode and Ag-wire was used as a pseudo-reference electrode. Electrochemical surface treatment was done in potentiostatic mode at two chosen potentials (4 V and 15 V). The surface area of 3D printed Ti-6AI-4V alloy implants was 4 cm 2 . The suitable volume of Ethaline for treatment of implants with mentioned surface area is 120 ml. The temperature during treatment was kept at a constant value of 25 °C using a thermostat Julabo model ME v.2 (Germany). The duration of electrochemical treatment was 20 min. for each implant.
- the potentiostatic electrochemical surface treatment in Ethaline at different potentials affects the surface roughness of titanium alloy implants.
- the measured parameters RMS the Root Mean Square of a surfaces measured microscopic peaks and valleys
- Example Mode of treatment Processing current density or potential (i/E, mA cm -2 , V) Surface roughness (RMS, nm) Untreated Ti-6AI-4V - - 497
- Example 1 Galvanostatic 5 mA cm -2 1366 25 mA cm -2 183 Potentiostatic 5 V 1410 30 V 175
- Example 2 Galvanostatic 5 mA cm -2 1245 25 mA cm -2 226 Potentiostatic 5 V 1280 30 V 220
- Example 3 Galvanostatic 5 mA cm -2 1123 25 mA cm -2 286 Potentiostatic 5 V 1173 30 V 280
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22193733.7A EP4332278A1 (de) | 2022-09-02 | 2022-09-02 | Verfahren zur elektrochemischen oberflächenbehandlung von biomedizinischen produkten aus titan oder ti-basierten legierungen |
PCT/SK2023/050024 WO2024049360A2 (en) | 2022-09-02 | 2023-08-24 | Method for electrochemical surface treatment of biomedical products made of titanium or ti-based alloys |
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EP22193733.7A EP4332278A1 (de) | 2022-09-02 | 2022-09-02 | Verfahren zur elektrochemischen oberflächenbehandlung von biomedizinischen produkten aus titan oder ti-basierten legierungen |
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Citations (2)
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US20040097755A1 (en) * | 2000-09-27 | 2004-05-20 | Abbott Andrew P. | Ionic liquids and their use as solvents |
WO2021115698A1 (en) * | 2019-12-10 | 2021-06-17 | Biotronik Ag | Novel electrolyte for electropolishing titanium alloys |
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2022
- 2022-09-02 EP EP22193733.7A patent/EP4332278A1/de active Pending
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- 2023-08-24 WO PCT/SK2023/050024 patent/WO2024049360A2/en unknown
Patent Citations (2)
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US20040097755A1 (en) * | 2000-09-27 | 2004-05-20 | Abbott Andrew P. | Ionic liquids and their use as solvents |
WO2021115698A1 (en) * | 2019-12-10 | 2021-06-17 | Biotronik Ag | Novel electrolyte for electropolishing titanium alloys |
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B. WALIVAARA, B.O. ARONSSON, M. RODAHL, J. LAUSMAA, P. TENGVALL: "Titanium with different oxides: in vitro studies of protein adsorption and contact activation", BIOMATERIALS, vol. 15, no. 10, 1994, pages 827 - 834, XP024142220, DOI: 10.1016/0142-9612(94)90038-8 |
CRISTINO A.FMATIAS I.A.S.BASTOS D.E.NGALHANO DOS SANTOS R.RIBEIRO A.P.C.MARTINS L.M.D.R.S.: "Glycerol Role in Nano Oxides Synthesis and Catalysis", CATALYSTS, vol. 10, 2020, pages 1406 |
DAS J.FREITAS F.EVANS I.NOGUEIRA A.KHUSHALANI D.: "A facile nonaqueous route for fabricating titania nanorods and their viability in quasi-solid-state dye-sensitized solar cells", J. MATER. CHEM., vol. 20, 2010, pages 4425 - 4431 |
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KITYK A., PROTSENKO V., DANILOV F., PAVLIK V., HNATKO M., SOLTYS J: "Enhancement of the surface characteristics of Ti-based biomedical alloy by electropolishing in environmentally friendly deep eutectic solvent (Ethaline)", PHYSICOCHEMICAL AND ENGINEERING ASPECTS, vol. 613, 2021, pages 126125, XP086497144, DOI: 10.1016/j.colsurfa.2020.126125 |
LEBEDEVA OLGA ET AL: "Advantages of Electrochemical Polishing of Metals and Alloys in Ionic Liquids", METALS, vol. 11, no. 6, 14 June 2021 (2021-06-14), pages 959, XP093028452, DOI: 10.3390/met11060959 * |
LI J.G., YANG X., ISHIGAKI T.: " Urea coordinated titanium trichloride Ti(III)[OC(NH)2]6C!3: a single molecular precursor yielding highly visible light responsive Ti02 nanocrystallites", J PHYS CHEM B, vol. 110, 2006, pages 14611 - 8 |
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SMITH E L: "Deep eutectic solvents (DESs) and the metal finishing industry: where are they now?", TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING, MANEY PUBLISHING, BIRMINGHAM, GB, vol. 91, no. 5, 1 September 2013 (2013-09-01), pages 241 - 248, XP001591312, ISSN: 0020-2967, DOI: 10.1179/0020296713Z.000000000120 * |
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