In- vitro corrosion behavior of the cast and extruded biodegradable Mg-Zn-Cu alloys in simulated body fluid (SBF)

Lotfpour, Mehrab; Dehghanian, Changiz; Emamy, M.; Bahmani, Ahmad; Malekan, Mehdi; Saadati, Ahmad; Taghizadeh, Milad; Shokouhimehr, Mohammadreza

doi:10.1016/j.jma.2021.01.002

Cited by 51 publications

(17 citation statements)

References 61 publications

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“…All alloys represented semi-circle loops, extending from beginning to end, which showed the existence of capacitive and inductive loops [18]. The Nyquist curves generally contained three semi-circles, including (I) the high-frequency, (II) the medium-frequency, and (III) the low-frequency one [7]. The high-frequency loop is related to the charge transfer of a double electric layer, and its size determines the charge transfer resistance.…”

Section: Resultsmentioning

confidence: 99%

“…These samples were then polished using 2000-grade SiC abrasive papers to ensure all surfaces were ready for corrosion tests. Then, two immersion tests in the 3.5 wt-% NaCl solution saturated with Mg(OH) 2 after 7 days was performed to calculate the corrosion rates using the hydrogen evolution and weight loss with the same setup as the previous studies [7,47,48]. Then, the samples were selected for the electrochemical tests.…”

Section: Experimental Processmentioning

confidence: 99%

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Enhanced corrosion resistance of the as-cast AZ91 magnesium alloy by micro-addition of the strontium and rare earth elements

Afsharnaderi

Lotfpour

Bahmani

et al. 2023

Materials Science and Technology

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The synergetic effect of strontium (Sr) and rare earth elements (RE) on the corrosion properties of as-cast Mg–9Al–1Zn alloy were studied. Via the addition of 0.5 wt-% RE and 0.5 wt-% Sr (RE/Sr ratio of 1), a remarkable reduction in the corrosion rate of AZ91 was observed. The reason was found to be related to the decrement of the micro-galvanic corrosion by the modification of the β-Mg17Al12 phase (changing its morphology from semi-continuous to a more spheroid shape) and formation of proper amounts of Al11RE3 and Al4Sr intermetallics. However, the excess RE/Sr ratio impaired the corrosion resistance, which can be related to the micro-galvanic effect by excess amounts of Al11RE3 and Al4Sr intermetallics.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Processmentioning

confidence: 99%

Enhanced corrosion resistance of the as-cast AZ91 magnesium alloy by micro-addition of the strontium and rare earth elements

Afsharnaderi

Lotfpour

Bahmani

et al. 2023

Materials Science and Technology

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“…Mg-based alloys have been regarded as excellent biomedical materials and achieve complete degradation due to a low density, good progressing ability and specific elastic modulus, which is similar to natural bone [1,2]. Nonetheless, in an electrolyte environment with a large number of corrosive ions (Cl − , HPO 4 2− , CO 3 2− , etc. ), mechanical integrity may be lost prematurely, even causing tissue necrosis [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, in an electrolyte environment with a large number of corrosive ions (Cl − , HPO 4 2− , CO 3 2− , etc. ), mechanical integrity may be lost prematurely, even causing tissue necrosis [3][4][5]. A low absolute strength and relatively low corrosion resistance are two main disadvantages that restrict wide industrial and clinical applications of Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characteristics and Corrosion Behaviors of Mg-2Zn-2Er-0.3Zr-0.3Mn Alloy under Various Rolling Reductions

Zheng¹,

Yuan²,

Liu³

et al. 2022

Metals

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The poor corrosion resistance of magnesium alloys is one of the major obstacles to their widespread applications in the engineering field and the medical field. A hot deformation process is the main way to improve the corrosion resistance of magnesium alloys. In the present study, X-ray photoelectron spectroscopy (XPS), a scanning electron microscope (SEM), an electron probe micro-analyzer (EPMA) and X-ray diffraction (XRD) were used to investigate the micro-galvanic corrosion behavior and film protection mechanism of hot-rolled Mg-2Zn-2Er-0.3Zr-0.3Mn under 25%, 50% and 75% thickness reductions in Hank’s solution. The results revealed that the best corrosion resistance was obtained in the alloy under a 75% thickness reduction, with a corrosion rate of 0.85 mm/y. The improvement in anti-corrosion was due to the coupling effect of a refined microstructure and dense degradation film on the large deformation hot-rolled alloy. Furthermore, the elements Mn and Er participated in the film formation and stabilized the film structure.

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“…Many studies have found that adding the Cu element to Mg-Zn alloys can refine the grain and improve alloy strength [17,18]. Mehrab et al [19] studied the effect of Cu content on the microstructure and properties of Mg-Zn alloys and showed that the formation of MgZnCu intermetallics for the Mg-2Zn-0.1Cu alloy and also the Mg(Zn,Cu) 2 compounds for the Mg-2Zn alloys with higher Cu contents. Moreover, the hot extrusion was applied for the grain refinement and changing the distribution of intermetallics.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zn and Cu Addition on Mechanical Properties of As-Extruded Mg-3Sn-1Ca Alloy

Zheng

2022

Materials

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The effects of Zn and Cu addition on the microstructure and mechanical properties of the extruded Mg-3Sn-1Ca alloy were systematically studied. The effects of the grain size, texture, type and distribution of the second phase on the mechanical properties of the alloy were analyzed. The mechanical test results show that the addition of Zn and Cu elements can significantly improve the mechanical properties of the alloy. The as-extruded Mg-3Sn-1Ca-1Zn-1Cu alloy has the best comprehensive mechanical properties, and the UTS, YS and EL are 244 MPa, 159 MPa and 13.4%, respectively. Compared with the Mg-3Sn-1Ca alloy, the UTS and EL of the Mg-3Sn-1Ca-1Zn alloy are increased by 50 MPa and 132%, respectively. However, the UTS of the TXC311 alloy is increased by 55 MPa, but the ductility of the Mg-3Sn-1Ca-1Cu alloy is far less than that of the Mg-3Sn-1Ca-1Zn alloy, which is mainly attributed to the presence of a large amount of hard and brittle Mg2Cu phase in the alloy. Interestingly, the addition of Zn to Mg-3Sn-1Ca-1Cu alloy can improve the elongation of the alloy, which is due to the solid solution strengthening caused by the Zn element and the formation of small MgZnCu phase with Zn element and the consumption of Mg2Cu phase.

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In- vitro corrosion behavior of the cast and extruded biodegradable Mg-Zn-Cu alloys in simulated body fluid (SBF)

Cited by 51 publications

References 61 publications

Enhanced corrosion resistance of the as-cast AZ91 magnesium alloy by micro-addition of the strontium and rare earth elements

Enhanced corrosion resistance of the as-cast AZ91 magnesium alloy by micro-addition of the strontium and rare earth elements

Microstructure Characteristics and Corrosion Behaviors of Mg-2Zn-2Er-0.3Zr-0.3Mn Alloy under Various Rolling Reductions

Effect of Zn and Cu Addition on Mechanical Properties of As-Extruded Mg-3Sn-1Ca Alloy

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