Microstructure-corrosion behaviour relationship of micro-alloyed Mg-0.5Zn alloy with the addition of Ca, Sr, Ag, In and Cu

Jin, Yiming; Blawert, Carsten; Hong, Yang; Wiese, Björn; Feyerabend, Frank; Bohlen, Jan; Mei, Di; Deng, Min; Campos, Maria Silva; Scharnagl, Nico; Strecker, Katharina; Bode, Julia; Vogt, Carsten; Willumeit‐Römer, Regine

doi:10.1016/j.matdes.2020.108980

Cited by 44 publications

(23 citation statements)

References 120 publications

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“…Ag is a nobler element than Mg, with a standard electrode potential (0.8 V) being much more positive than that of Mg (−2.38 V). It is known that the elements with lower equilibrium potential are easier to loss electrons, resulting in a preferred corrosion in ɑ‐Mg matrix 34,49 ; (2) it has been indicated that Ag addition could promote the formation of Mg 2 Sn precipitates during aging process, 25,27 which probably act more corrosion origins. (3) The new research shows that Ag atoms in ɑ‐Mg matrix are dissolved to form Ag + ions during corrosion, which subsequently redeposit on the alloy surface via displacement reaction with Mg to form Ag nanoparticles, which resulted in a significant cathodic activation.…”

Section: Resultsmentioning

confidence: 99%

Effects of Ca and Ag addition and heat treatment on the corrosion behavior of Mg‐7Sn alloys in 3.5 wt.% NaCl solution

2022

Surface & Interface Analysis

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The effects of 1 wt.% Ca or 1 wt.% Ca + 1 wt.% Ag addition and heat treatment on the corrosion behavior of Mg‐7Sn (wt.%) alloy in 3.5 wt.% NaCl solution were investigated by electrochemical measurements and immersion tests. The alloys were characterized by optical microscope (OM), X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X‐ray photoelectron spectroscopy (XPS). It was found that all alloys were corroded by pitting corrosion and grain boundary corrosion and further corroded with time going. Loose layers of compounds, including Mg (OH)2, MgO, SnO2, and other compounds containing Ca and Ag elements, were calibrated on the surface of corroded Mg‐7Sn‐1Ca‐1Ag alloy. The Ca addition improved the corrosion resistance of Mg‐7Sn alloy due to the formation of relatively stable compounds containing calcium element and grains refinement. Furthermore, the solid solutioned alloys obtained a superior corrosion resistance due to the dissolve of eutectic Mg2Sn phase and homogenization treatment. However, the aging treatment is slightly detrimental to the corrosion resistance of Mg‐7Sn alloys with the formation of Mg2Sn precipitates. In conclusion, the aged Mg‐7Sn‐1Ca‐1Ag alloy exhibited a better corrosion resistance and a noticeable micro‐hardness property compared with those of as‐cast Mg‐7Sn alloy. And this study provides an important idea for the research on the comprehensive properties of Mg‐Sn alloys.

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Section: Resultsmentioning

confidence: 99%

Effects of Ca and Ag addition and heat treatment on the corrosion behavior of Mg‐7Sn alloys in 3.5 wt.% NaCl solution

2022

Surface & Interface Analysis

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“…While certain global factors, such as the temperature of body fluids and the pH level, are maintained approximately constant (37 °C and 7.0, respectively), the details of the local chemical composition can be considerably different [ 157 , 158 ]. The chemical composition of the in vitro testing solutions may vary greatly, from a simple physiological solution containing 0.9 wt.% NaCl [ 159 ] or Ringer’s solution [ 160 ] to complex multicomponent SBFs such as Hank’s [ 147 ] and Kokubo’s solutions [ 161 ], etc. In common, the bio-corrosion environment contains many chloride ions known as strong corrosive agents for Mg.…”

Section: Corrosion Properties: Modern Insights and Challengesmentioning

confidence: 99%

Attaining High Functional Performance in Biodegradable Mg-Alloys: An Overview of Challenges and Prospects for the Mg-Zn-Ca System

et al. 2023

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This article presents a concise overview of modern achievements and existing knowledge gaps in the area of biodegradable magnesium alloys. Hundreds of Mg-based alloys have been proposed as candidates for temporary implants, and this number tends to increase day by day. Therefore, while reviewing common aspects of research in this field, we confine ourselves primarily to the popular Mg-Zn-Ca system, taken as a representative example. Over the last decades, research activities in this area have grown enormously and have produced many exciting results. Aiming at highlighting the areas where research efforts are still scarce, we review the state-of-the-art processing techniques and summarize the functional properties attained via a wide variety of processing routes devised towards achieving a desired properties profile, including the mechanical response in terms of strength, ductility, and fatigue resistance paired with biocompatibility and bio-corrosion resistance or controlled degradability. We pay keen attention to a summary of corrosion properties and mechano-chemical interactions between an aggressive environment and loaded Mg-based structures, resulting in stress corrosion cracking and premature corrosion fatigue failures. The polemic issues and challenges practitioners face in their laboratory research are identified and discussed.

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“…For example, the addition of Ag into Mg–Zn alloys remarkably increase the hardness although the corrosion resistance was impaired [ 72 ]. Most recently, the micro-alloyed systems such as Mg-0.5Zn-(0.2X) alloys showed great potential in biomedical applications due to the reduction of precipitates [ 73 ]. Similarly, the compound of Mg 12 Nd greatly inhibited the galvanic corrosion of Mg-Nd-Zn-Zr alloys because of the reduction in the gap of the electrode potential between α matrix phase and Mg 12 Nd phase [ 74 ].…”

Section: Current Strategies To Address Challenges Of Mg or Its Alloysmentioning

confidence: 99%

Clinical translation and challenges of biodegradable magnesium-based interference screws in ACL reconstruction

Luo

Zhang

Wang³

et al. 2021

Bioactive Materials

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As one of the most promising fixators developed for anterior cruciate ligament (ACL) reconstruction, biodegradable magnesium (Mg)-based interference screws have gained increasing attention attributed to their appropriate modulus and favorable biological properties during degradation after surgical insertion. However, its fast degradation and insufficient mechanical strength have also been recognized as one of the major causes to limit their further application clinically. This review focused on the following four parts. Firstly, the advantages of Mg or its alloys over their counterparts as orthopaedic implants in the fixation of tendon grafts in ACL reconstruction were discussed. Subsequently, the underlying mechanisms behind the contributions of Mg ions to the tendon-bone healing were introduced. Thirdly, the technical challenges of Mg-based interference screws towards clinical trials were discussed, which was followed by the introduction of currently used modification methods for gaining improved corrosion resistance and mechanical properties. Finally, novel strategies including development of Mg/Titanium (Ti) hybrid fixators and Mg-based screws with innovative structure for achieving clinically customized therapies were proposed. Collectively, the advancements in the basic and translational research on the Mg-based interference screws may lay the foundation for exploring a new era in the treatment of the tendon-bone insertion (TBI) and related disorders.

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Microstructure-corrosion behaviour relationship of micro-alloyed Mg-0.5Zn alloy with the addition of Ca, Sr, Ag, In and Cu

Cited by 44 publications

References 120 publications

Effects of Ca and Ag addition and heat treatment on the corrosion behavior of Mg‐7Sn alloys in 3.5 wt.% NaCl solution

Effects of Ca and Ag addition and heat treatment on the corrosion behavior of Mg‐7Sn alloys in 3.5 wt.% NaCl solution

Attaining High Functional Performance in Biodegradable Mg-Alloys: An Overview of Challenges and Prospects for the Mg-Zn-Ca System

Clinical translation and challenges of biodegradable magnesium-based interference screws in ACL reconstruction

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