Evaluating the improvement of corrosion residual strength by adding 1.0wt.% yttrium into an AZ91D magnesium alloy

Wang, Qiang; Liu, Yaohui; Fang, Shijie; Song, Yulai; Zhang, Dawei; Zhang, Lina; Li, Chunfang

doi:10.1016/j.matchar.2010.03.013

Cited by 24 publications

(7 citation statements)

References 17 publications

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“…Nonetheless, these alloys are highly susceptible to corrosion when exposed to aggressive environments, resulting on the loss of its mechanical characteristics. In the recent years, many magnesium alloys have been developed in order to increase both its mechanical and corrosion resistance [1][2][3][4], but even though it is necessary to apply a protective coating on the metallic surface in order to prevent the contact with corrosive species. Many of the most efficient surface treatments for magnesium alloys uses chromium-based compounds including Cr 6+ species, highly toxic and harmful for health and the environment, which are in process of interdiction by the international normative.…”

Section: Introductionmentioning

confidence: 99%

Architectural optimization of an epoxy-based hybrid sol–gel coating for the corrosion protection of a cast Elektron21 magnesium alloy

Murillo-Gutiérrez¹,

Ansart²,

Bonino³

et al. 2014

Applied Surface Science

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An epoxy-based hybrid sol-gel coating was prepared in various architectural configurations has been studied for the corrosion protection of a cast Elektron21 magnesium alloy. The creation of a single layer of this coating presents defects consisting of macro-pores and protuberances, which opens access for corrosive species to reach the metallic substrate. These defects are suspected to result from the high reactivity of the substrate, as well as to the irregular topography of the substrate disrupted by the microstructure of the own magnesium alloy. Hence, a sol-gel coating in bilayer architecture is proposed, where the first layer would "inert" the surface of the magnesium substrate, and the second layer would cover the defects of the first layer and also thickening the coating. The morphological characteristics of the sol-gel coatings were analyzed by scanning electron microscopy (SEM), and their corrosion behavior was evaluated by OCP (open circuit potential) monitoring and electrochemical impedance spectroscopy (EIS) in chloride media. It is shown that both the architectural arrangement and the individual thickness of the first and second layers have an important influence on the anticorrosion performances of the protective system, just as much as its global thickness.

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Section: Introductionmentioning

confidence: 99%

Architectural optimization of an epoxy-based hybrid sol–gel coating for the corrosion protection of a cast Elektron21 magnesium alloy

Murillo-Gutiérrez¹,

Ansart²,

Bonino³

et al. 2014

Applied Surface Science

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“…Because the content of Zn in AZ91 magnesium alloy is relatively less and does not participate in the chemical reaction, [9] AZ91-RE magnesium alloy is considered as Mg-Al-RE ternary alloy system in thermodynamic analysis. The rare earth elements Ce, Y, and Gd added to AZ91 magnesium alloy will be formed intermetallic compounds of Al 4 Ce, [10] Al 2 Y, [11] and Al 2 Gd [12] with Al in the alloy, so this study mainly focuses on the thermodynamic analysis of Al 4 Ce, Al 2 Y, and Al 2 Gd compounds. The formation ability and formation process of Al 4 Ce, Al 2 Y, and Al 2 Gd, and their effects on the microstructure of alloys were studied by the gibbs free energy of formation reaction of Al 4 Ce, Al 2 Y, and Al 2 Gd in Mg-Al-RE alloy melt.…”

Section: Research and Calculation Methodsmentioning

confidence: 99%

Thermodynamic Analysis of Al‐RE Phase Formation in AZ91‐RE (Ce, Y, Gd) Magnesium Alloy

Cai

Guo

et al. 2019

Physica Status Solidi (b)

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The Al-RE intermetallic compounds formed by adding rare earth elements into AZ magnesium alloy have important effects on the microstructure and properties of alloy. Based on classical thermodynamic theory and Miedema model and Toop model, the heat of formation of compounds in Mg-Al-RE (Ce, Y, Gd) ternary alloy and Gibbs free energy of Al-RE (Al 4 Ce, Al 2 Y, and Al 2 Gd) compounds are calculated theoretically, the order of formation of compounds in alloys and the formation process of Al-RE compounds are analyzed. The results show that, Al-RE (Al 4 Ce, Al 2 Y, and Al 2 Gd) compounds are preferentially formed in Mg-Al-RE (Ce, Y, Gd) alloys, Al-RE compounds are mainly formed before the crystallization of α-Mg solid solution; meanwhile, with the crystallization of α-Mg solid solution, Al-RE compounds can still be formed sustainably. The order of Al-RE compounds formation ability is Al 4 Ce, Al 2 Gd, and Al 2 Y, but the order of formation ability is Al 2 Gd, Al 2 Y, and Al 4 Ce, when adding the same mass fraction of rare earth (Ce, Y, Gd). In as-cast structure of AZ91-0.9 wt%; RE (Ce, Y, Gd) experimental alloys, Al-RE compounds mainly distributes at grain boundaries of alloys at two different scales, and the amount of β-Mg 17 Al 12 phase in alloys decreases relative to that of alloys without RE.

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“…After the material corrodes, its strength gradually declines until it broken. Therefore, the strength of the material after corrosion is called Corrosion residual strength (CRS) [16,17].The study of residual strength of corrosion is helpful to predict the service life of materials and avoid loss due to unexpected material failure. In addition, if it can establish the prediction method of CRS will promote and popularize the application of magnesium alloy [18,19].…”

Section: Introductionmentioning

confidence: 99%

Dynamic corrosion mechanical properties of magnesium alloys with Erbium in the chloride ions environment

et al. 2022

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The X-ray diffraction (XRD), scanning electron microscope (SEM), weight loss corrosion rate, corrosion residual strength (CRS), and slow strain rate tensile (SSRT) methods were used to study the effects of the addition of rare earth Erbium (Er) on the dynamic corrosion mechanical properties of the AM50 magnesium alloy. The results show that after Er was added, a new phase of Al3Er appeared and the microstructure was refined. The corrosion resistance of rare earth Er addition to the alloy was 0.5% > 1.5% > 1.0% > 0. Furthermore, the corrosion rates decreased in 432 h. The CRS results within 168 h show that the strength after an addition of 0.5% Er was the highest and the decline rate was the smallest. According to the shape of the tensile curve of CRS and the morphology of the tensile fracture, the addition of rare earth Er did not change the fracture form of the alloy, which remained as quasi-cleavage.

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Evaluating the improvement of corrosion residual strength by adding 1.0wt.% yttrium into an AZ91D magnesium alloy

Cited by 24 publications

References 17 publications

Architectural optimization of an epoxy-based hybrid sol–gel coating for the corrosion protection of a cast Elektron21 magnesium alloy

Architectural optimization of an epoxy-based hybrid sol–gel coating for the corrosion protection of a cast Elektron21 magnesium alloy

Thermodynamic Analysis of Al‐RE Phase Formation in AZ91‐RE (Ce, Y, Gd) Magnesium Alloy

Dynamic corrosion mechanical properties of magnesium alloys with Erbium in the chloride ions environment

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