Effects of Alloying Element Ca on the Corrosion Behavior and Bioactivity of Anodic Films Formed on AM60 Mg Alloys

Anawati, Anawati; Asoh, Hidetaka; Ono, Satoshi

doi:10.3390/ma10010011

Cited by 23 publications

(21 citation statements)

References 30 publications

(61 reference statements)

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“…In general, the larger the Rp of the metal materials, the larger the ion cloud on the electrode surface, thus preventing charge exchange. The corrosion potential (E corr ) of the samples is mainly determined by the relative size between anode and cathode reaction rates, which reflects the reaction trend [31]. Furthermore, the corrosion current density (I corr ) shows a decreasing trend: Mg-RE sheet with TRC sample (1.51 × 10 −4 µA) < Mg-RE ingot sample (1.74 × 10 −3 µA).…”

Section: Microstructure Characteristicmentioning

confidence: 99%

Preparation and Characterization of Mg-RE Alloy Sheets and Formation of Amorphous/Crystalline Composites by Twin Roll Casting for Biomedical Implant Application

Wang

2019

Metals

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A new type of Mg-based metallic glass has attracted extensive attention due to its excellent corrosion resistance and favorable biocompatibility. In this study, an amorphous/crystalline composite Mg-RE alloy sheet was prepared by a vertical type twin roll caster (VTRC) method, and its microstructure was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and electron probe micro-analysis (EPMA) and transmission electron microscopy (TEM); furthermore, the corrosion behaviors of the Mg-RE alloy sheet were investigated in PBS solution using electrochemical techniques and immersion testing in a simulated physiological condition. Furthermore, it was implanted into the femur of rats to explore its prospect as biological transplantation material. Its microscopic characterization experiments show that the crystal structure is crystalline phase containing amorphous phase. Electrochemical experiments and immersion testing both showed that Mg-RE(La,Ce) sheet with VTRC has a better corrosion resistance than master alloy, and a uniform corrosion layer on the surface. In vivo, as an implant material, tests show that Mg-RE alloy sheets have better biocompatibility and induce new bone formation, and they can be expected to be utilized as implant materials in the future.

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Section: Microstructure Characteristicmentioning

confidence: 99%

Preparation and Characterization of Mg-RE Alloy Sheets and Formation of Amorphous/Crystalline Composites by Twin Roll Casting for Biomedical Implant Application

Wang

2019

Metals

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“…Unfortunately, almost all these Mg-based alloys consist of aluminum, nickel or other rare earth elements [ 2 , 6 , 9 , 12 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. The permanent presence of these elements in the physiological environment may induce latent toxicity and gradually cause chronic diseases (Alzheimer’s disease and muscle fiber damage) [ 13 , 23 , 24 , 25 , 26 , 27 ]. Therefore, it is essential to develop an adequate degradable alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Homogenization on Microstructure Characteristics, Corrosion and Biocompatibility of Mg-Zn-Mn-xCa Alloys

Yuan

Lai

et al. 2018

Materials

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The corrosion behaviors of Mg-2Zn-0.2Mn-xCa (denoted as MZM-xCa alloys) in homogenization state have been investigated by immersion test and electrochemical techniques in a simulated physiological condition. The microstructure features were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron probe microanalysis (EPMA), and the corrosion mechanism was illustrated using atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS) and confocal laser scanning microscopy (CLSM). The electrochemical and immersion test verify the MZM-0.38% Ca owns the best corrosion performance with the corrosion rate of 6.27 mm/year. Furthermore, the film layer of MZM-0.38% Ca is more compact and denser than that of others. This improvement could be associated with the combined effects of the suitable content of Zn/Ca dissolving into the α-Mg matrix and the modification of Ca-containing compounds by heat-treatment. However, the morphologies were transformed from uniform corrosion to localized pitting corrosion with Ca further addition. It could be explained that the excessive Ca addition can strengthen the nucleation driving force for the second phase formation, and the large volumes fraction of micro-galvanic present interface sites accelerate the nucleation driving force for corrosion propagation. In addition, in vitro biocompatibility tests also show the MZM-0.38% Ca was safe to bone mesenchymal stem cells (BMSCs) and was promising to be utilized as implant materials.

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“…Plasma electrolytic oxidation (PEO) is an anodization technique to form a conversion coating on metal surfaces by the application of high voltage to create a breakdown potential. The resulted coating exhibits high wear resistance and good corrosion barrier which is suitable for Mg alloys [11].The PEO coatings decreased the corrosion rate of Mg alloys by nearly two orders [7,8,10]. The degradation behavior of the coating in aqueous solutiondepends on its composition and structure [11].…”

Section: Introductionmentioning

confidence: 99%

“…The addition of alloying elements is known to improvenot only the corrosion resistance but alsothe mechanical properties of Mg alloys [4]. Recently, there has been great interest to use calcium (Ca) as an alloying element in Mg alloys [5][6][7][8].For engineering application, the presence of alloying element Ca increased the heat resistance and antiburning effect of Mg alloys which is beneficial for many applications [5]. The addition of Ca in biomedical materials is advantageous to accelerate the formation of bone mineral hydroxyapatite (HAp) and thus the healing process [6].…”

Section: Introductionmentioning

confidence: 99%

Characterization of coatings formed on AZX magnesium alloys by plasma electrolytic oxidation

Anawati¹,

Gumelar²

2018

AIP Conference Proceedings

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Abstract. Plasma Electrolytic Oxidation (PEO) is an electrochemical anodization process which involves the application of a high voltage to create intense plasma on a metal surface to form a ceramic type of oxide. The resulted coating exhibits high wear resistance and good corrosion barrier which are suitable to enhance the performance of biodegradable Mg alloys. In this work, the role of alloying element Ca in modifying the characteristics of PEO layer formed on AZ61 series magnesium alloys was investigated. PEO treatment was conducted on AZ61, AZX611, and AZX612 alloys in 0.5 M Na3PO4 solution at a constant current of 200 A/m 2 at 25°C for 8 min. The resulted coatings were characterized by field emission-scanning electron microscope (FESEM), X-ray diffraction spectroscopy (XRD), and X-ray fluorescence spectroscopy (XRF), as well as hardness test. The presence of alloying element Ca in the AZ61 alloys accelerated the PEO coatings formation without altering the coating properties significantly. The coating formed on AZX specimen was slightly thicker (~14-17 μm) than that of formed onthe AZ specimens (~13 μm). Longer exposure time to plasma discharge was the reason for faster thickening of the coating layer on AZX specimen. XRD detected a similar crystalline oxide phase of Mg3(PO4)2 in the oxide formed on all of the specimens. Zn was highly incorporated in the coatingswith a concentration in the range 24-30 wt%, as analyzed by XRF. Zn compound might exist in amorphous phases. The microhardness test on the coatings revealed similar average hardness ~124 HVon all of thespecimens.

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Effects of Alloying Element Ca on the Corrosion Behavior and Bioactivity of Anodic Films Formed on AM60 Mg Alloys

Cited by 23 publications

References 30 publications

Preparation and Characterization of Mg-RE Alloy Sheets and Formation of Amorphous/Crystalline Composites by Twin Roll Casting for Biomedical Implant Application

Preparation and Characterization of Mg-RE Alloy Sheets and Formation of Amorphous/Crystalline Composites by Twin Roll Casting for Biomedical Implant Application

Effect of Homogenization on Microstructure Characteristics, Corrosion and Biocompatibility of Mg-Zn-Mn-xCa Alloys

Characterization of coatings formed on AZX magnesium alloys by plasma electrolytic oxidation

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