Bioactive plasma electrolytic oxidation coatings on Mg-Ca alloy to control degradation behaviour

Mohedano, M.; Luthringer, Bérengère; Mingo, B.; Feyerabend, Frank; Arrabal, R.; Sanchez-Egido, P.J.; Blawert, Carsten; Willumeit‐Römer, Regine; Zheludkevich, Mikhail L.; Matykina, E.

doi:10.1016/j.surfcoat.2017.02.050

Cited by 89 publications

(50 citation statements)

References 60 publications

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“…In the case of the Mg0.6Ca2Ag alloy, two different EDS analyses (Figure 1d, Points 5 and 6) showed the formation of particles with different contents of Ag. (Figure 2a) as an eutectic aggregate with lamellar morphology, probably formed by α-Mg/Mg2Ca phases in accordance with the EDS analysis (Table 3), the Mg-Ca phase diagram and other works on binary Mg-Ca alloys [25,[32][33][34]. In addition, polygonal shape particles ( Figure 2b) containing impurities were found (Point 2, Table 3).…”

Section: Characterisationsupporting

confidence: 84%

“…Following the immersion, a heavy generalized corrosion was observed in all cases ( Figure 11) and PEO coatings were evidently detached, and, in the case of the Mg0.6Ca2Ag/PEO system, this had already occurred by the 4th day of immersion. A complete loss of adhesion is not a typical behaviour for PEO-coated Mg alloy, as was previously demonstrated by the authors in [25], and a 40-50 µmthick coating can be expected to remain mostly adhered even after 8 weeks of immersion with a thick corrosion product layer developing underneath it.…”

Section: Hydrogen Evolution Measurementmentioning

confidence: 66%

“…Although, in our previous study of a similar alloy (cast Mg0.8Ca) a formation of Mg2Ca phase was confirmed [25]. Most of the diffraction peaks of Mg0.6Ca2Ag were the same as those for Mg0.6Ca except that there were small peaks in a low 2θ angles region corresponding to binary and ternary intermetallic phases as Mg2Ca, MgAg4, Mg54Ag17 [25,36,43] and Ca2MgAg3 (Figure 7, inset). A further systematic TEM and electron diffraction study would be necessary in order to confirm the presence of these phases.…”

Section: Alloymentioning

confidence: 67%

“…Regarding the second strategy to improve the corrosion resistance based on surface modification of Mg and its alloys, the Plasma Electrolytic Oxidation (PEO) technique is one of the most promising candidates, as modified surfaces show improved corrosion behaviour along with other properties (e.g., biocompatibility) [24]. PEO generates anticorrosive, biocompatible and bioactive ceramic coatings with tailored composition, roughness, microstructure and porosity that can be controlled by optimization of the process electrical parameters and the composition of the electrolyte [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings

et al. 2019

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Bioactive Plasma Electrolytic Oxidation (PEO) coatings enriched in Ca, P and F were developed on Mg0.6Ca and Mg0.6Ca2Ag alloys with the aim to impede their fast degradation rate. Different characterization techniques (SEM, TEM, EDX, SKPFM, XRD) were used to analyze the surface characteristics and chemical composition of the bulk and/or coated materials. The corrosion behaviour was evaluated using hydrogen evolution measurements in Simulated Body Fluid (SBF) at 37 °C for up to 60 days of immersion. PEO-coated Mg0.6Ca showed a 2–3-fold improved corrosion resistance compared with the bulk alloy, which was more relevant to the initial 4 weeks of the degradation process. In the case of the Mg0.6Ag2Ag alloy, the obtained corrosion rates were very high for both non-coated and PEO-coated specimens, which would compromise their application as resorbable implants. The amount of F− ions released from PEO-coated Mg0.6Ca during 24 h of immersion in 0.9% NaCl was also measured due to the importance of F− in antibacterial processes, yielding 33.7 μg/cm2, which is well within the daily recommended limit of F− consumption.

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Section: Characterisationsupporting

confidence: 84%

Section: Hydrogen Evolution Measurementmentioning

confidence: 66%

Section: Alloymentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

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Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings

et al. 2019

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“…Functional coatings applied to titanium, magnesium, and aluminum alloys have been used extensively in implants because of their antimicrobial properties, predictable degradation behavior and biocompatibility, all of which reduce the risk of post-operative infections [1,3,8,12]. The use of plasma electrolytic oxidation (PEO), also termed micro-arc oxidation (MAO), allows for coatings to have a carefully controlled composition, microstructure, porosity, and surface roughness for improved surface bioactivity [13] and corrosion resistance [12,14]. Coatings developed through MAO and embedded with inorganic antibacterial metal elements (e.g., silver, copper, and zinc) have been reported to reduce the incidence of implant-related infections, but the bioactivity and toxicity of these coatings is controversial [1,13,15,16].…”

Section: Introductionmentioning

confidence: 99%

Implant Coating Manufactured by Micro-Arc Oxidation and Dip Coating in Resorbable Polylactide for Antimicrobial Applications in Orthopedics

Cao

Tian²,

Dong³

et al. 2019

Coatings

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Prophylaxis and the treatment of implant-related infections has become a key focus area for research into improving the outcome of orthopedic implants. Functional resorbable coatings have been developed to provide an antimicrobial surface on the implant and reduce the risk of infection. However, resorbable coatings developed to date still suffer from low adhesive strength and an inadequate release rate of antibiotics. This study presents a novel double-coating of micro-arc oxidation and resorbable polylactide copolymer on a Ti-6Al-4V implant with the aim of reducing the risk of infection post-implantation. The adhesive strength, rate of coating degradation, and antibiotic release rate were investigated. A key finding was that the micro-arc oxidation coating with the addition of antibiotics increased the adhesive strength of the poly-l-lactide-co-ε-caprolactone (PLC) coatings. The adhesive strength was influenced by the concentration of the PLC solution, the surface structure of the titanium substrate, and the composition of the coatings. The antibiotics blended into the PLC coating had a release cycle of approximately 10 days, which would be long enough to reduce the risk of developing an infection after implantation. The double coatings presented in this study have an excellent potential for reducing the incidence and severity of implants-related early infections.

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Characterization and In Vitro Behavior of PEO Coated Mg Modified with Antibacterial Ag(I) and Cu(II) Complexes

Tsimafeyeva,

Starykevich,

Snihirova

et al. 2024

Chemistry A European J

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The use of Mg‐based biomaterials with a number of their advantageous properties are overshadowed by uncontrollable metal corrosion. Moreover, the use of implants goes alongside with the threat of pathogens‐associated complications. In this study, PEO coated Mg biomaterial loaded with antibacterial Ag(I) and Cu(II) complexes is produced and tested to meet both appropriate protective characteristics as well as sufficient level of antibacterial activity. To achieve a suitable level of anticorrosion protection phosphate and fluoride‐phosphate electrolytes are used in the PEO process. Investigation of the surface thickness and morphology done by means of cross‐section analysis and scanning electron microscopy (SEM), as well as electrochemical impedance spectroscopy (EIS) assay show precedence of the fluoride containing PEO coating and make it the material of choice for further modification with Ag(I) and Cu(II) complexes. The presence of the complexes on the PEO surface is confirmed by energy dispersive X‐ray spectroscopy (EDX). X‐ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and glow discharge optical emission spectroscopy (GDOES) are used to estimate the complexes’ chemical state and depth of penetration in the coating surface. Based on the results of antibacterial assay, the modified coatings are found to be active against both Gram‐positive and Gram‐negative bacteria.

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Bioactive plasma electrolytic oxidation coatings on Mg-Ca alloy to control degradation behaviour

Cited by 89 publications

References 60 publications

Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings

Degradation Behaviour of Mg0.6Ca and Mg0.6Ca2Ag Alloys with Bioactive Plasma Electrolytic Oxidation Coatings

Implant Coating Manufactured by Micro-Arc Oxidation and Dip Coating in Resorbable Polylactide for Antimicrobial Applications in Orthopedics

Characterization and In Vitro Behavior of PEO Coated Mg Modified with Antibacterial Ag(I) and Cu(II) Complexes

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