Evaluation of the electrochemical performance of Ag containing AAO layers after extended exposure to a model corrosive medium

Kozhukharov, S.; Girginov, Christian; Kiradzhiyska, Denitsa; Tsanev, A.; Avdeev, G

doi:10.5599/jese.820

Cited by 9 publications

(5 citation statements)

References 57 publications

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“…The morphology of the samples is similar to the Al 2 O 3 -Ag composite layers produced in previous works in literature [60,68]: these studies have highlighted the absence of crystallinity in the composite material, which appears completely amorphous and in which the low amount of Ag cannot be detected in XRD patterns.…”

Section: Coatings Morphologysupporting

confidence: 76%

Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

et al. 2021

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The emergence and spreading of the SARS-CoV-2 pandemic has forced the focus of attention on a significant issue: the realization of antimicrobial surfaces for public spaces, which do not require extensive use of disinfectants. Silver represents one of the most used elements in this context, thanks to its excellent biocidal performance. This work describes a simple method for the realization of anodized aluminum layers, whose antimicrobial features are ensured by the co-deposition with silver nitrate. The durability and the chemical resistance of the samples were evaluated by means of several accelerated degradation tests, such as the exposure in a salt spray chamber, the contact with synthetic sweat and the scrub test, highlighting the residual influence of silver in altering the protective behavior of the alumina layers. Furthermore, the ISO 22196:2011 standard was used as the reference protocol to set up an assay to measure the effective antibacterial activity of the alumina-Ag layers against both Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria, even at low concentrations of silver. Finally, the Ag-containing aluminum oxide layers exhibited excellent antimicrobial performances also following the chemical–physical degradation processes, ensuring good durability over time of the antimicrobial surfaces. Overall, this work introduces a simple route for the realization of anodized aluminum surfaces with excellent antibacterial properties.

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Section: Coatings Morphologysupporting

confidence: 76%

Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

et al. 2021

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“…The corrosion potentials of all samples underwent anodic oxidation are shifted to more positive values. This fact is consequence of the modifications of the surface chemical composition, as proposed in Kozhukharov et al [22]. Significant difference of the polarization resistance and corrosion current density values was observed only The images in Figure 2 show potentiodynamic polarization curves of different metal pads of chosen sample groups.…”

Section: Resultsmentioning

confidence: 61%

“…PDS curves were obtained from −100 to 1000 mV against open circuit potential with a voltage sweep rate of 10 mV s −1 . The measurements were performed with two identical samples of each type since the electrochemical behavior of anodized EN AW 1050 alloy has already been reported with good repeatability of the results [22].…”

Section: Electrochemical Analysismentioning

confidence: 99%

Preparation and Preliminary Evaluation of Silver-Modified Anodic Alumina for Biomedical Applications

Kiradzhiyska

Milcheva

Mancheva

et al. 2021

Metals

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The present study reports a specific method for preparation of silver-modified anodic alumina substrates intended for biomaterial applications. Al2O3 coatings were obtained by anodization of technically pure aluminum alloy in sulfuric acid electrolyte. Silver deposition into the pores of the anodic structures was carried out employing in situ thermal reduction for different time periods. The obtained coatings were characterized using scanning electron microscopy (SEM), potentiodynamic scanning after 168 h in 3.5% NaCl solution and bioassays with human fibroblast and NIH/3T3 cell lines. The modified alumina substrates demonstrated better biocompatibility compared to the control anodic Al2O3 pads indicated by increased percent cell survival following in vitro culture with human and mouse fibroblasts. The Ag-deposition time did not affect considerably the biocompatibility of the investigated anodic layers. SEM analyses indicated that mouse NIH/3T3 cells and human fibroblasts adhere to the silver-coated alumina substrates retaining normal morphology and ability to form cell monolayer. Therefore, the present studies demonstrate that silver coating of anodic alumina substrates improves their biocompatibility and their eventual biomedical application.

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“…The PDS curves were submitted to Tafel slope analyses. Next, the differences in the data acquired from every two samples were submitted to a simplified method, used in a previous work [25], based on Eq. (1):…”

Section: Statistical Data Treatment Proceduresmentioning

confidence: 99%

Impact of the final thermal sealing of combined zinc/cerium oxide protective coating primers formed on low carbon steel

Kozhukharov

Girginov

Boshkova

et al. 2022

J. Electrochem. Sci. Eng.

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The final sealing possesses a proven beneficial effect on the protective properties of anodic oxide films on aluminum. In this sense, the present research is devoted to the evaluation of the impact of this procedure on the barrier ability of combined Zn/Ce oxide layers deposited on low carbon steel samples. For this purpose, four samples were submitted to galvanic zinc deposition, followed by spontaneous formation of cerium oxide primer layer (CeOPL). Afterwards, two of the samples underwent thermal sealing in boiling water in order to enhance their barrier ability. Its evaluation was performed by two electrochemical methods: electrochemical impedance spectroscopy (EIS) and potentiodynamic scanning (PDS) after 24 hours of exposure to a diluted model corrosive medium (MCM). Other instrumental methods were used in order to describe the effect of this final procedure on the color characteristics and hydrophobicity of the films. The results were collected from multiple tests, followed by statistical data treatment. In addition, the surfaces of the obtained films were submitted to direct observation by scanning electron microscopy (SEM), coupled with energy dispersion X-ray (EDX). Their composition was determined by means of X-ray Photoelectron Spectroscopy (XPS). The acquired data have revealed a detrimental effect of the final sealing in boiling water. It was expressed by the loss of the barrier properties of the Zn/CeOPL films, combined with additional decolorization and hydrophilization. Finally, the mechanism of this detrimental effect was determined by further SEM, EDX and XPS analyses.

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Evaluation of the electrochemical performance of Ag containing AAO layers after extended exposure to a model corrosive medium

Cited by 9 publications

References 57 publications

Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

Preparation and Preliminary Evaluation of Silver-Modified Anodic Alumina for Biomedical Applications

Impact of the final thermal sealing of combined zinc/cerium oxide protective coating primers formed on low carbon steel

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