Influence of cross-rolling on the micro-texture and biodegradation of pure iron as biodegradable material for medical implants

Obayi, Camillus Sunday; Tolouei, R.; Paternoster, Carlo; Turgeon, Stéphane; Okorie, B. A.; Obikwelu, Daniel Oray Nnamdi; Cassar, Glenn; Buhagiar, Joseph; Mantovani, Diego

doi:10.1016/j.actbio.2015.01.024

Cited by 62 publications

(27 citation statements)

References 42 publications

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“…Where, a and b are constant of the metal and d is the grain size (µm). Obayi et al [19] reported that grain refinement of pure iron via bi-directional rolling leads to a uniform surface corrosion but without significant change on corrosion rate when compared to that of uni-directional rolling.…”

Section: Accepted Manuscriptmentioning

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: Accepted Manuscriptmentioning

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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“…Several studies investigated the microstructural influences on the mechanical properties and the degradation behavior of pure Fe. Therefore, different fabrication or metal processing techniques were investigated, such as electroforming (E-Fe) [ 6 , 7 ], magnetron sputtering (S-Fe) [ 8 ], rolling techniques [ 9 , 10 ], and equal channel angular pressing (ECAP-Fe) [ 11 , 12 , 13 ]. Also, the influence of implementing precipitates, namely Pd [ 14 , 15 , 16 , 17 ], Au [ 18 , 19 , 20 , 21 ], Pt [ 17 ], Fe 2 O 3 particles [ 22 ], and carbon nanotubes [ 23 ] into the Fe matrix was studied.…”

Section: Introductionmentioning

confidence: 99%

Magnetron Sputtering as a Fabrication Method for a Biodegradable Fe32Mn Alloy

2017

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Biodegradable metals are a topic of great interest and Fe-based materials are prominent examples. The research task is to find a suitable compromise between mechanical, corrosion, and magnetic properties. For this purpose, investigations regarding alternative fabrication processes are important. In the present study, magnetron sputtering technology in combination with UV-lithography was used in order to fabricate freestanding, microstructured Fe32Mn films. To adjust the microstructure and crystalline phase composition with respect to the requirements, the foils were post-deposition annealed under a reducing atmosphere. The microstructure and crystalline phase composition were investigated by scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. Furthermore, for mechanical characterization, uniaxial tensile tests were performed. The in vitro corrosion rates were determined by electrochemical polarization measurements in pseudo-physiological solution. Additionally, the magnetic properties were measured via vibrating sample magnetometry. The foils showed a fine-grained structure and a tensile strength of 712 MPa, which is approximately a factor of two higher compared to the sputtered pure Fe reference material. The yield strength was observed to be even higher than values reported in literature for alloys with similar composition. Against expectations, the corrosion rates were found to be lower in comparison to pure Fe. Since the annealed foils exist in the austenitic, and antiferromagnetic γ-phase, an additional advantage of the FeMn foils is the low magnetic saturation polarization of 0.003 T, compared to Fe with 1.978 T. This value is even lower compared to the SS 316L steel acting as a gold standard for implants, and thus enhances the MRI compatibility of the material. The study demonstrates that magnetron sputtering in combination with UV-lithography is a new concept for the fabrication of already in situ geometrically structured FeMn-based foils with promising mechanical and magnetic properties.

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“…After the O-ring cell was filled with 50ml SBF solution, the testing sample was immersed for 1 hour to reach a stable condition before further electrochemical tests. Potentiodynamic polarization curves were measured with the potential scanning rate of 3 mV s -1 from -1 V to 0 V. For long-time electrochemical impedance spectroscopy (EIS) measurement, the testing sample was mounted on the O-ring cell and the measurement was conducted in certain time points (day 0, 1,3,7,14,21,28). The amplitude of the signal was 10 mV in the frequency range from 100 kHz to 10 mHz for impedance data acquisition.…”

Section: Sandblasting Processmentioning

confidence: 99%

Accelerated Degradation Behavior and Cytocompatibility of Pure Iron Treated with Sandblasting

Zhou

Yang

Frank

et al. 2016

ACS Appl. Mater. Interfaces

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Fe-base materials are of interest to be used in biodegradable implants. However, their corrosion rate in the biological environment may be too slow for the targeted applications. In this work, sandblasting is applied as a successful surface treatment for increasing the degradation rate of pure iron in simulated body fluid. Two sandblasting surfaces with different roughness present various surface morphologies but similar degradation products.Electrochemistry tests revealed that sandblasted samples have a higher corrosion rate as compared to bare iron, and even more noteworthy, the degradation rate of sandblasted samples remains significantly higher during long-term immersion tests. Based on our experimental results, the most plausible reasons behind the fast degradation rate are the special properties of sandblasted surfaces including the change of surface composition (for the early stage), high roughness (occluded surface sites), and high density of dislocations.Furthermore, the cytocompatibility was studied on sandblasting surfaces using human 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

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Influence of cross-rolling on the micro-texture and biodegradation of pure iron as biodegradable material for medical implants

Cited by 62 publications

References 42 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

Magnetron Sputtering as a Fabrication Method for a Biodegradable Fe32Mn Alloy

Accelerated Degradation Behavior and Cytocompatibility of Pure Iron Treated with Sandblasting

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