Tailoring the electrochemical degradation of iron protected with polypyrrole films for biodegradable cardiovascular stents

Cysewska, Karolina; Macía, Lucía Fernández; Jasiński, Piotr; Hubin, Annick

doi:10.1016/j.electacta.2017.05.172

Cited by 20 publications

(16 citation statements)

References 49 publications

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“…This was done by alloying iron with manganese, palladium, silver, gallium, gold and platinum [5][6][7][8] by various techniques such as vacuum plasma nitriding process [9], vapour vacuum arc technique [10] and magnetron sputtering [11]. A rather different approach, mostly suitable for porous iron, was done by making composite or iron with polymers where the hydrolysis of polymers created a local acidic environment that dissolve iron oxides [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Design and characterization of nano and bimodal structured biodegradable Fe-Mn-Ag alloy with accelerated corrosion rate

Bagha

Khakbiz

Sheibani

et al. 2018

Journal of Alloys and Compounds

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Researchers in biodegradable metals have been putting efforts to accelerate the corrosion of ironbased biodegradable metals. These include by alloying iron with manganese and noble elements such as silver, but further increase to the corrosion rate is still needed. In this study, a set of bimodal nano/microstructured Fe-30Mn-1Ag alloys was prepared through mechanical alloying and spark plasma sintering. The alloys were characterized and tested for their corrosion behavior in Hanks' solution at 37 o C and for their mechanical properties. The bimodal-structured alloy possessed a mixture of austenitic (γ-FeMn) and ferritic (α-Fe) phases, while the nano-and macro-structured ones were essentially composed of γ-FeMn and α-Fe phases, respectively. Addition of 1-3 wt.% of silver into the nanostructured alloy increased its corrosion rate from 0.24 mm/year to 0.33 and 0.58 mm/year for Fe-30Mn-1Ag and Fe-30Mn-3Ag, respectively. Whilst, the bimodal Fe-30Mn-1Ag alloy corroded at a higher rate of 0.88 mm/year. This alloy also possessed an interesting combination of high and low micro-hardness phases that contributed to high shear strength of 417 MPa and shear strain of 0.66. Detailed discussion on the relationship of microstructure with corrosion behavior and mechanical properties is presented in this manuscript.

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Section: Introductionmentioning

confidence: 99%

Design and characterization of nano and bimodal structured biodegradable Fe-Mn-Ag alloy with accelerated corrosion rate

Bagha

Khakbiz

Sheibani

et al. 2018

Journal of Alloys and Compounds

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“…surface treatment process and protective coating (Table 2 ). Attempts to accelerate the corrosion rate of iron-based metals has been done by various methods such as alloying with manganese, palladium, silver, gallium, sulfur, and intermetallics (Čapek et al 2016 ; Wang et al 2017a ; Hufenbach et al 2017 ; Sotoudehbagha et al 2018 ; Sikora-Jasinska et al 2018 ), vacuum plasma nitriding process (Lin et al 2016 ), implanting silver using a vapour vacuum arc technique (Huang et al 2016 ), and making composite with polymers (Yusop et al 2015 ; Cysewska et al 2017 ; Qi et al 2018 ). Slowing down the corrosion rate of magnesium-based metals has been addressed by various means such as purification from detrimental impurities (Hofstetter et al 2015 ; Qu et al 2017 ), alloying with calcium, zinc, rare earth elements (RE) and other elements (Zander and Zumdick 2015 ; Mao et al 2017 ; Li et al 2018 ), and coating with bioceramics or biopolymers (Hiromoto et al 2015 ; Witecka et al 2016 ; Su et al 2016 ; Patil et al 2017 ).…”

Section: Basic Researchmentioning

confidence: 99%

Updates on the research and development of absorbable metals for biomedical applications

2018

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Absorbable metals, metals that corrode in physiological environment, constitute a new class of biomaterials intended for temporary medical implant applications. The introduction of these metals has shifted the established paradigm of metal implants from preventing corrosion to its direct application. Interest toward absorbable metals has been growing in the past decade. This is proved by the rapid increase in scientific publication, progressive development of standards, and launching the first commercial products. Iron, magnesium, zinc, and their alloys are the current three absorbable metals families. Magnesium-based metals are the most progressing family with a large data set obtained from both basic and translational research. Iron-based metals are still facing a major challenge of low in vivo corrosion rate despite the significant efforts that have been put to overcome its weakness. Zinc-based metals are the new alternative absorbable metals with moderate corrosion rates that fall between those of iron and magnesium. This manuscript provides a brief review on the latest progress in the research and development of absorbable metals, the most important findings, the remaining challenges, and the perspective on the future direction.Graphical abstract

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“…S-5B). 22 The equivalent circuits make use of a constant phase element (CPE) as a substitute for a capacitor. The fitting data are listed in Table II.…”

Section: Bilayer Coatingmentioning

confidence: 99%

Corrosion protection of AZ91D magnesium alloy by a duplex coating

López

Loperena

Lehr

et al. 2020

JSCS

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A duplex coating was formed under potentiostatic conditions on magnesium alloy AZ91D in order to improve its corrosion resistance in simulated physiological environment. The first layer was formed by anodization at low potentials in molybdate solution. The outer layer was a PPy film electro-synthesized in sodium salicylate solution. The conditions of the formation were determined to obtain a layer with globular morphology. The bilayer was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion protection properties of the coatings were examined in Ringer solution by monitoring the open circuit potential (OCP), polarization techniques, and electrochemical impedance spectroscopy (EIS). The obtained results showed that the bilayer improves the corrosion resistance of the substrate. Moreover, the duplex coating presented better anticorrosive properties than the single PPy film. Afterwards, the bilayer was modified by cementation of silver ions from a solution containing AgNO3. The modified electrode exhibited good antibacterial properties.

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Tailoring the electrochemical degradation of iron protected with polypyrrole films for biodegradable cardiovascular stents

Cited by 20 publications

References 49 publications

Design and characterization of nano and bimodal structured biodegradable Fe-Mn-Ag alloy with accelerated corrosion rate

Design and characterization of nano and bimodal structured biodegradable Fe-Mn-Ag alloy with accelerated corrosion rate

Updates on the research and development of absorbable metals for biomedical applications

Corrosion protection of AZ91D magnesium alloy by a duplex coating

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