Characterization and colorization of microarc-oxidized layers of binary titanium alloys

Hwang, Moon-Jin; Choi, Hee Jong; Song, Ho‐Jun; Park, Kyung Hee

doi:10.1016/j.jallcom.2017.10.181

Cited by 15 publications

(4 citation statements)

References 32 publications

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“…PEO has been widely used in cpTi [12,18] and its alloys [19][20][21]. Moreover, to the best knowledge of the authors, it was not found studies that compared Ti15Zr alloys with PEO and SLA surfaces with regard to corrosion, protein adsorption, and biofilm formation, properties that play crucial roles in implant treatment success.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of biofunctional coating for a TiZr alloy: Surface, electrochemical, and biological characterizations

Cordeiro

Pantaroto

Paschoaleto

et al. 2018

Applied Surface Science

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This study formed a biofunctional coating for a Ti15Zr alloy to improve the surface characteristics, the electrochemical behavior, and the biological properties of this implant material. Ti15Zr discs (15 mm in diameter Â 1 mm thickness) were obtained in three versions: machined, SLA Ò-treated (control groups), and modified by plasma electrolytic oxidation (PEO) (experimental group). Surface features such as topography, composition, surface roughness, surface free energy, and hardness were assessed. Electrochemical tests were conducted with body fluid solution (pH 7.4). The albumin protein adsorption was measured by the bicinchoninic acid method, and the adhesion of Streptococcus sanguinis was determined. The surface treatments modified the material's topography. SLA promoted surface roughness higher than that of the other groups, whereas PEO surfaces presented the highest values of hardness and surface free energy. PEO increased the polarization resistance and the corrosion potential, and decreased capacitance and corrosion current density values. In addition, plasma treatment improved the albumin adsorption without being favorable to biofilm adhesion. PEO appears to be the most promising alternative for Ti15Zr alloys, since it improved surface characteristics and electrochemical behavior, as well as enhancing the adsorption of albumin on the material surface with fewer tendencies to bacterial adhesion.

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Section: Introductionmentioning

confidence: 99%

Synthesis of biofunctional coating for a TiZr alloy: Surface, electrochemical, and biological characterizations

Cordeiro

Pantaroto

Paschoaleto

et al. 2018

Applied Surface Science

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show abstract

“…Colorants are added into the PEO electrolyte to obtain coatings with a diversity of colors. [37][38][39][40][41] Among the colored coatings, the black coatings with high emissivity and high absorption are highly desired for the interior components of airships, especially for electronics house packaging for thermal control applications. [42][43][44] Salts of transition metals such as V and W are usually used as additives to fabricate black PEO coatings.…”

Section: Introductionmentioning

confidence: 99%

Fast formation of a black inner α‐Al₂O₃ layer doped with CuO on Al–Cu–Li alloy by soft sparking PEO process

Tian

et al. 2023

J Am Ceram Soc.

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Forming high‐temperature α‐Al2O3 phase under soft sparking is an intriguing phenomenon in plasma electrolytic oxidation (PEO) of Al alloys, which contradicts the low energy input of the process. In this study, α‐Al2O3 doped with black CuO is formed beneath an amorphous white outer layer on Al–Cu–Li alloy by PEO in a dilute silicate electrolyte under soft sparking. In comparison, reddish coatings with dominating γ‐Al2O3 are formed under the conventional plasma discharges, although blackish inner layer with α‐Al2O3 can also be exposed by heavily polishing the samples. In order to know the underlying mechanism, temperatures at the coating surface and the underlying substrate have been monitored by a thermocouple under the conventional and soft sparking PEO regimes, respectively. Interestingly, high temperatures are detected in the case of soft sparking rather than PEO with strong discharges. The formation of CuO, quartz, and cristobalite within the soft sparking coating also supports the existence of high temperature. Hence, the formation of α‐Al2O3 under soft sparking can be resolved to the conventional thermal activation mechanism, without the need of seeking other plausible explanations. Thermal condition evaluation for soft sparking PEO suggests that values of the effective thermal conductivity during PEO process for the outer layer and the barrier layer at the coating/substrate interface might be lower than ∼0.05 and ∼0.0017 W m−1 K−1, respectively. It is believed that the amorphous structure of the outer and barrier layers effectively blocks the heat dissipation, facilitating the formation of a highly wear‐resistant inner layer with α‐Al2O3, CuO, and the other high‐temperature species under soft sparking.

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“…In this way, the functionalization of the surface of the alloys is sought to be imparted by different methods [ 15 ]. One of the most straightforward and versatile one is the micro-arc oxidation (MAO) technique, also called plasma electrolytic oxidation (PEO) [ 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial Cu-Doped TiO2 Coatings on the β Ti-30Nb-5Mo Alloy by Micro-Arc Oxidation

Cardoso,

Barbaro,

Kuroda

et al. 2023

Materials

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Among the different surface modification techniques, micro-arc oxidation (MAO) is explored for its ability to enhance the surface properties of Ti alloys by creating a controlled and durable oxide layer. The incorporation of Cu ions during the MAO process introduces additional functionalities to the surface, offering improved corrosion resistance and antimicrobial activity. In this study, the β-metastable Ti-30Nb-5Mo alloy was oxidated through the MAO method to create a Cu-doped TiO2 coating. The quantity of Cu ions in the electrolyte was changed (1.5, 2.5, and 3.5 mMol) to develop coatings with different Cu concentrations. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron and atomic force microscopies, contact angle, and Vickers microhardness techniques were applied to characterize the deposited coatings. Cu incorporation increased the antimicrobial activity of the coatings, inhibiting the growth of Staphylococcus aureus, Enterococcus faecalis, Pseudomonas aeruginosa bacteria strains, and Candida albicans fungus by approximately 44%, 37%, 19%, and 41%, respectively. Meanwhile, the presence of Cu did not inhibit the growth of Escherichia coli. The hardness of all the deposited coatings was between 4 and 5 GPa. All the coatings were non-cytotoxic for adipose tissue-derived mesenchymal stem cells (AMSC), promoting approximately 90% of cell growth and not affecting the AMSC differentiation into the osteogenic lineage.

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Characterization and colorization of microarc-oxidized layers of binary titanium alloys

Cited by 15 publications

References 32 publications

Synthesis of biofunctional coating for a TiZr alloy: Surface, electrochemical, and biological characterizations

Synthesis of biofunctional coating for a TiZr alloy: Surface, electrochemical, and biological characterizations

Fast formation of a black inner α‐Al₂O₃ layer doped with CuO on Al–Cu–Li alloy by soft sparking PEO process

Antimicrobial Cu-Doped TiO2 Coatings on the β Ti-30Nb-5Mo Alloy by Micro-Arc Oxidation

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Characterization and colorization of microarc-oxidized layers of binary titanium alloys

Cited by 15 publications

References 32 publications

Synthesis of biofunctional coating for a TiZr alloy: Surface, electrochemical, and biological characterizations

Synthesis of biofunctional coating for a TiZr alloy: Surface, electrochemical, and biological characterizations

Fast formation of a black inner α‐Al2O3 layer doped with CuO on Al–Cu–Li alloy by soft sparking PEO process

Antimicrobial Cu-Doped TiO2 Coatings on the β Ti-30Nb-5Mo Alloy by Micro-Arc Oxidation

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Fast formation of a black inner α‐Al₂O₃ layer doped with CuO on Al–Cu–Li alloy by soft sparking PEO process