Effects of Zn on microstructure, mechanical properties and corrosion behavior of Mg–Zn alloys

Cai, Shu-Hua; Lei, Ting; Li, Nianfeng; Feng, Feng

doi:10.1016/j.msec.2012.07.042

Cited by 352 publications

(139 citation statements)

References 38 publications

(53 reference statements)

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“…The improvement of corrosion resistance of the composites can be understood by the positive effect of produced Zn and Mg-Zn intermetallic compounds. As demonstrated in previous works [19][20][21][22], Zn is able to significantly improve the corrosion resistance of Mg matrix. On the other hand, the above results suggested that the remaining ZnO and newly produced MgO had negative effects on the corrosion resistance of these composites.…”

Section: Composition and Microstructure Of Compositessupporting

confidence: 61%

“…The work indicated that in situ reaction products including MgO, Zn, and intermetallic compounds significantly reinforced mechanical performance of the fabricated composites. Previous research has shown that Zn is an effective additive that improves the mechanical properties as well as the corrosion resistance of Mg-based biomaterials [19][20][21][22]. In addition, Zn is also biocompatible and biodegradable with a daily moderate amount of allowance [23,24].…”

Section: Introductionmentioning

confidence: 99%

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In Vitro Corrosion Properties of Mg Matrix In Situ Composites Fabricated by Spark Plasma Sintering

Cao

Pham

Narita

et al. 2017

Metals

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Mg matrix in situ composites were fabricated from Mg and ZnO powder by a spark plasma sintering method. The composition and microstructure of the sintered samples were characterized. Corrosion properties of fabricated composites were evaluated by immersion and by electrochemical tests using Hanks' solution. The results showed that the formation of in situ products improved significantly the corrosion resistance of the fabricated composites compared with pure Mg; Mg-10 wt % ZnO composites especially exhibited the lowest corrosion rate. In addition, an energy-dispersive X-ray (EDX) analysis showed that calcium phosphate formed as a corrosion product on the surface of Mg-10 wt % ZnO composites, while Mg(OH)2 appeared as a corrosion product on the surface of Mg-20 wt % ZnO composite. The findings suggested Mg-10 wt % ZnO composite as a potential candidate for temporary implant application.

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Section: Composition and Microstructure Of Compositessupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

In Vitro Corrosion Properties of Mg Matrix In Situ Composites Fabricated by Spark Plasma Sintering

Cao

Pham

Narita

et al. 2017

Metals

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“…In addition, an evident reduction in strength and a clear increase in ductility could be observed at 150 °C. The improved tensile strength at room temperature and at 150 °C due to 0.09 wt% Ti alloying can be mainly attributed to two aspects: (1) The grain boundary strengthening resulting from the smaller SDAS, according to the Hall-Petch equation, which is supported by a number of findings [19][20][21] . (2) Solid solution strengthening caused by Sn and Zn, and precipitate strengthening caused by the refined thermally stable Mg 2 Sn phases, which can effectively impede mobile dislocation, pin grain boundaries and hinder crack propagation [22][23][24] .…”

Section: Tensile Propertiesmentioning

confidence: 83%

Improved tensile properties of Mg-8Sn-1Zn alloy induced by minor Ti addition

et al. 2016

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Owing to their good mechanical properties at room temperature, conventional Mg-Al and Mg-Zn based alloys have attracted great interest. Unfortunately, they have problems associated with lower creep and corrosion resistance, and cannot meet the requirements of key structural components due to the low thermal stability of the main secondary phase at elevated temperatures (>150 °C) [1][2] . Therefore, it is imperative to develop novel Mg alloys with excellent performance at high temperatures.Mg-Sn based alloys have received considerable attention as potential candidates for high performance casting and wrought magnesium alloys with enhanced thermal stability owing to the presence of high melting temperature (T m ≈ 770 °C) Mg 2 Sn particles in the microstructure [3][4] . However, the coarse Mg 2 Sn phase and the dendritic structure are often present in ascast binary Mg-Sn alloys, hindering their industrial application [5] . Consequently, the modification of the Abstract:In this study, the influence of minor titanium (Ti) addition on the microstructure and tensile properties of Mg-8Sn-1Zn based alloys were investigated by means of optical microscopy, X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry, and tensile tests. The results showed that Ti can decrease the secondary dendrite arm spacing (SDAS). The tensile strength of the Mg-8Sn-1Zn-Ti alloys is initially increased by increasing the Ti content up to 0.09wt.%, but subsequently decreased for further increase of Ti content. The improved tensile properties are attributed to the decreased SDAS and refined Mg 2 Sn phases, as well as the increased fraction of tin (Sn) segregated regions. The tensile fracture surface of the studied alloys shows mixed characteristics of cleavage and quasi-cleavage fracture. Adding Ti does not significantly change the fracture mode of the studied alloys.Key words: Mg-8Sn-1Zn alloy; tensile properties; titanium; tin segregation Micro-alloying can ideally help achieve this goal. The element Ti has been widely used owing to its effectiveness in grain refinement of not only Al-based and Mg-Al alloys, but also of Al-free Mg alloys [6] . Choi et al. [7] reported that a proper control of trace amounts of Ti below the solubility limit has the potential to improve the corrosion resistance of cast Mg-Al alloys by decreasing the grain size and the volume fraction, as well as the size of lamellar (α+β) structures and the divorced eutectic β-phase, with the morphology being transformed from a continuous network structure to a semi-continuous one. Similarly, a study by Candan et al. [8] on AZ91 alloys containing 0.2-0.5wt.% Ti indicated that an improvement in tensile strength can be achieved by introducing Ti to modify the microstructure and refine the grain size. However, until now, only Yang et al. [9] have investigated the effects of minor Ti additions on the ascast microstructure and mechanical properties of Mg-Sn based alloys. The results showed that the addition of 0.1-0.3 wt.% Ti to the Mg-3Sn-2Sr alloy can simulta...

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“…아연(Zn)은 Mg과 합금화되면 결 정립 미세화, 고용 강화, 석출 강화 등의 기구를 통해 기계 적 특성을 향상시키며 Fe, Ni 등 내식성을 약화시키는 불순 물의 영향을 감소시켜 부식 속도를 낮추는 효과가 있는 것으 로 보고되어 있다 [10,11]. 또한, Zn는 인체의 필수 영양 원 소 중 하나로 알루미늄(Al)이나 희토류 금속(RE)과 같은 다 른 첨가 원소와 비교할 때 인체에 미치는 독성이 상대적으로 약하다 [12].…”

Section: 서 론unclassified

Corrosion behavior of Mg-(0~6)%Zn Casting Alloys in 1M NaCl Solution

Hwang¹,

Kim²,

Jun³

2016

Journal of Korea Foundry Society

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The effects of the Zn content on the microstructure and corrosion behavior in 1M NaCl solution were investigated in Mg-(0~6)%Zn casting alloys. The MgZn phase was scarcely observed in the Mg-1%Zn alloy, while the Mg-(2~6)%Zn alloy consisted of α-(Mg) and MgZn phases. With an increase in the Zn content, the amount of the MgZn phase was gradually increased. Immersion and electrochemical corrosion tests indicated that the Mg-1%Zn alloy had the lowest corrosion rate among the alloys, and a further increase in the Zn content resulted in the deterioration of the corrosion resistance. Microstructural examinations of the corroded surfaces and EIS analyses of surface corrosion films revealed that the best corrosion resistance at 1%Zn was associated with the absence of MgZn phase particles in the microstructure and the contribution of Zn element to the formation of a protective film on the surface. A micro-galvanic effect by the MgZn particles led to the increased rate of corrosion at a higher Zn content.

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Effects of Zn on microstructure, mechanical properties and corrosion behavior of Mg–Zn alloys

Cited by 352 publications

References 38 publications

In Vitro Corrosion Properties of Mg Matrix In Situ Composites Fabricated by Spark Plasma Sintering

In Vitro Corrosion Properties of Mg Matrix In Situ Composites Fabricated by Spark Plasma Sintering

Improved tensile properties of Mg-8Sn-1Zn alloy induced by minor Ti addition

Corrosion behavior of Mg-(0~6)%Zn Casting Alloys in 1M NaCl Solution

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