Antibacterial effect of PEO coating with silver on AA7075

Cerchier, Pietrogiovanni; Pezzato, Luca; Brunelli, Katya; Dolcet, Paolo; Bartolozzi, Alessandra; Bertani, Roberta; Dabalà, Manuele

doi:10.1016/j.msec.2017.02.084

Cited by 36 publications

(23 citation statements)

References 29 publications

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“…Actually, in the plots, the points represent the experimental data and the lines, the result of the fitting. In detail, for the untreated sample, a simple circuit with one parallel R‐CPE (Figure a) was used in order to simulate the presence and the corrosion behavior of only the natural oxide layer, instead for PEO coatings, the more complex circuit with two parallel R‐CPE (Figure b) was used in order to simulate the typical double‐layer structure of PEO coatings with the presence of an inner layer and an external porous layer that could be functionalized, for example, with particles addition . The inner layer is in this case very thin and not clearly observable in the SEM images of the cross‐section but is always present in PEO coatings and is the zone near the substrate where there is a reduction in the porosity.…”

Section: Resultsmentioning

confidence: 99%

Corrosion and mechanical properties of plasma electrolytic oxidation‐coated AZ80 magnesium alloy

Pezzato

Coelho

Bertolini

et al. 2019

Materials & Corrosion

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Plasma electrolytic oxidation (PEO) coatings were produced on AZ80 magnesium alloy in a solution containing silicates and phosphates and working at high current densities with short treatment times. The effect of a sealing treatment in boiling water on corrosion and mechanical properties of the coatings were investigated. Moreover, the corrosion mechanism of the samples with and without the sealing treatment was evaluated. The microstructure of the coatings was characterized with scanning electron microscope observation and X‐ray diffraction analysis. The mechanical properties were evaluated with nanoindentation tests and the corrosion resistance was studied by potentiodynamic polarization, electrochemical impedance spectroscopy, and scanning vibrating electrode technique. The results showed that the sealing did not influence the microstructure and the mechanical properties of the samples and instead produced a remarkable increase in the corrosion resistance. The crevice corrosion, present in the sample without the sealing, was avoided with the treatment in boiling water.

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Section: Resultsmentioning

confidence: 99%

Corrosion and mechanical properties of plasma electrolytic oxidation‐coated AZ80 magnesium alloy

Pezzato

Coelho

Bertolini

et al. 2019

Materials & Corrosion

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“…Similarly, the development of AgNPs containing PEO coatings on macroporous plasma sprayed titanium surface has also been evaluated, that resulted in bioactive and antibacterial coating of fine (0.07–0.5 µm) layer on plasma sprayed substrate . AgNPs based PEO coating has also been recently reported on aluminum alloy 7075 exhibiting strong antibacterial action against Gram positive and Gram negative bacteria …”

Section: Antibacterial Coatings Through Peomentioning

confidence: 99%

Surface modification of valve metals using plasma electrolytic oxidation for antibacterial applications: A review

Rizwan

Alias

Zaidi

et al. 2017

J Biomedical Materials Res

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Plasma electrolytic oxidation (PEO) is an advance technique to develop porous oxidation layer on light metals, primarily to enhance corrosion and wear resistance. The oxidation layer can also offer a wide variety of mechanical, biomedical, tribological, and antibacterial properties through the incorporation of several ions and particles. Due to the increasing need of antimicrobial surfaces for biomedical implants, antibacterial PEO coatings have been developed through the incorporation of antibacterial agents. Metallic nanoparticles that have been employed most widely as antibacterial agents are reported to demonstrate serious health and environmental threats. To overcome the current limitations of these coatings, there is a significant need to develop antibacterial surfaces that are not harmful for patient's health and environment. Attention of the readers has been directed to utilize bioactive glasses as antibacterial agents for PEO coatings. Bioactive glasses are well known for their excellent bioactivity, biocompatibility, and antibacterial character. PEO coatings incorporated with bioactive glasses can provide environment-friendly antimicrobial surfaces with exceptional bioactivity, biocompatibility, and osseointegration. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 590-605, 2018.

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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%

“…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]. Polylactide is polymeric material that is commonly used in orthopedics for osteosynthesis due to its biodegradability and biocompatibility [9,17].…”

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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Antibacterial effect of PEO coating with silver on AA7075

Cited by 36 publications

References 29 publications

Corrosion and mechanical properties of plasma electrolytic oxidation‐coated AZ80 magnesium alloy

Corrosion and mechanical properties of plasma electrolytic oxidation‐coated AZ80 magnesium alloy

Surface modification of valve metals using plasma electrolytic oxidation for antibacterial applications: A review

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

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