The Microstructure, and Mechanical and Corrosion Properties of As-Cast and As-Extruded Mg-2%Zn-x%Cu Alloys After Solution and Aging Heat Treatments

Dehghanian, Changiz; Lotfpour, Mehrab; Emamy, M.

doi:10.1007/s11665-019-03978-4

Cited by 17 publications

(11 citation statements)

References 23 publications

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“…In some studies on MgMC, while the effect of the reinforcement addition on corrosion properties was investigated, Zn was generally used in the content of the matrix alloy [30,39,40]. Since the solubility of Zn in Mg at room temperature is maximum 2 wt.%, Mg2Zn alloy was chosen as the matrix [39,41]. This is the reason why Mg2Zn alloy was chosen as the matrix in the current study.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical, and Corrosion Behavior of Al2O3 Reinforced Mg2Zn Matrix Magnesium Composites

Erçetin

Pimenov

2021

Materials

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Powder metallurgy (PM) method is one of the most effective methods for the production of composite materials. However, there are obstacles that limit the production of magnesium matrix composites (MgMCs), which are in the category of biodegradable materials, by this method. During the weighing and mixing stages, risky situations can arise, such as the exposure of Mg powders to oxidation. Once this risk is eliminated, new MgMCs can be produced. In this study, a paraffin coating technique was applied to Mg powders and new MgMCs with superior mechanical and corrosion properties were produced using the hot pressing technique. The content of the composites consist of an Mg2Zn matrix alloy and Al2O3 particle reinforcements. After the debinding stage at 300 °C, the sintering process was carried out at 625 °C under 50 MPa pressure for 60 min. Before and after the immersion process in Hank’s solution, the surface morphology of the composite specimens was examined by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis. With the hot pressing technique, composite specimens with a very dense and homogeneous microstructure were obtained. While Al2O3 reinforcement improved the mechanical properties, it was effective in changing the corrosion properties up to a certain extent (2 wt.% Al2O3). The highest tensile strength value of approximately 191 MPa from the specimen with 8 wt.% Al2O3. The lowest weight loss and corrosion rate were obtained from the specimen containing 2 wt.% Al2O3 at approximately 9% and 2.5 mm/year, respectively. While the Mg(OH)2 structure in the microstructure formed a temporary film layer, the apatite structures containing Ca, P, and O exhibited a permanent behavior on the surface, and significantly improved the corrosion resistance.

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Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical, and Corrosion Behavior of Al2O3 Reinforced Mg2Zn Matrix Magnesium Composites

Erçetin

Pimenov

2021

Materials

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“…21,22 In addition, more dissolution of second phase (MgZn 2 , Mg 2 Sn) was achieved and this led to less cathodic sites, which resulted in a better corrosion resistance. 23,26 The result also confirmed that Mg 2 Sn disappeared and Sn element dissolved in α-Mg matrix after solution treatment. This is probably the major reason to improve the corrosion resistance.…”

Section: Effects Of Heat Treatment On the Corrosion Resistancementioning

confidence: 53%

“…4 Therefore, the aging treatment resulted in an inferior corrosion resistance by the formation of Mg 2 Sn precipitates, which was similar with other alloys in previous reports. 23,26 However, the corrosion resistance of aged Mg-7Sn-1Ca-1Ag alloy is better than that of as-cast Mg-7Sn-1Ca-1Ag alloy due to Mg 2 Sn phase refinement and composition uniformity.…”

Section: Effects Of Heat Treatment On the Corrosion Resistancementioning

confidence: 99%

“…25 Hence, an appropriate solution and aging treatment is required to modify the amount and distribution of the second phases to control the corrosion resistance of Mg-Sn alloys. 23,26 A composition of aged Mg-7Sn-1Ca-1Ag (wt.%) with a noticeable mechanical property was investigated. 27 However, the effect of Ca or Ca + Ag addition and solution treatment combined with aging treatment on the corrosion resistance of Mg-7Sn alloy and the corresponding mechanism were not clear.…”

Section: Introductionmentioning

confidence: 99%

“…But aging treatment avoided the coarse Mg 2 Sn phase formation and provides a noticeable mechanical property with well heat resistance 25 . Hence, an appropriate solution and aging treatment is required to modify the amount and distribution of the second phases to control the corrosion resistance of Mg‐Sn alloys 23,26 …”

Section: Introductionmentioning

confidence: 99%

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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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Microstructure Evolution and Mechanical Properties of the AZ91 Magnesium Alloy with Sr and Ti Additions in the As-Cast and As-Aged Conditions

Afsharnaderi

Malekan

Emamy

et al. 2019

J. of Materi Eng and Perform

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The Microstructure, and Mechanical and Corrosion Properties of As-Cast and As-Extruded Mg-2%Zn-x%Cu Alloys After Solution and Aging Heat Treatments

Cited by 17 publications

References 23 publications

Microstructure, Mechanical, and Corrosion Behavior of Al2O3 Reinforced Mg2Zn Matrix Magnesium Composites

Microstructure, Mechanical, and Corrosion Behavior of Al2O3 Reinforced Mg2Zn Matrix Magnesium Composites

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

Microstructure Evolution and Mechanical Properties of the AZ91 Magnesium Alloy with Sr and Ti Additions in the As-Cast and As-Aged Conditions

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