Influence of alloyed Al on the microstructure and corrosion properties of extruded Mg–8Sn–1Zn alloys

Kim, Hyeon Ju; Kim, Peter Beomcheol; Baek, Soo-Min; Sohn, So-Dam; Shin, Hyung‐Joon; Jeong, Hu Young; Yim, Chang Dong; You, Bong Sun; Ha, Heung Yong

doi:10.1016/j.corsci.2015.03.007

Cited by 32 publications

(8 citation statements)

References 30 publications

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“…Ha et al [39,40] used this method to study the change trend of anode passive current density at −1.7 V and cathode hydrogen evolution current density at −1.9 V of Mg–5Sn–(1–4 wt %)Zn alloy system. Similarly, Kim et al [41] studied the polarization curve of Mg–8Sn–1Zn alloy with this method. In order to explore the role that Ga played in the anodic passive layer, Figure 5b compares the passive current density values for the alloys of different Ga contents with the alloy without Ga addition.…”

Section: Resultsmentioning

confidence: 99%

Influence of Alloyed Ga on the Microstructure and Corrosion Properties of As-Cast Mg–5Sn Alloys

et al. 2019

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In this paper, the microstructures and corrosion behaviors of as-cast Mg–5Sn–xGa alloys with varying Ga content (x = 0, 0.5, 1, 2, 3 wt %) were investigated. The results indicated that Ga could not only adequately refine the grain structure of the alloys, but could also improve the corrosion resistance. The microstructures of all alloys exhibited typical dendritic morphology. No Ga-rich secondary phases were detected when 0.5 wt % Ga was added, while only the morphology of Mg2Sn phase was changed. However, when the addition rate of Ga exceeded 0.5 wt %, an Mg5Ga2 intermetallic compound started to form from the interdendritic region. The volume fraction of Mg5Ga2 monotonically increased with the increasing Ga addition level. Although Mg5Ga2 phase was cathode phase, its pitting sensitivity was weaker than Mg2Sn. In addition, the standard potential of Ga (−0.55 V) was lower than that of Sn (−0.14 V), which relieved the driving force of the secondary phases for the micro-galvanic corrosion. An optimized composition of 3 wt % Ga was concluded based on the immersion tests and polarization measurements, which recorded the best corrosion resistance.

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Section: Resultsmentioning

confidence: 99%

Influence of Alloyed Ga on the Microstructure and Corrosion Properties of As-Cast Mg–5Sn Alloys

et al. 2019

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“…All SKPFM measurements were conducted at the ambient temperature. The details of the corrosion-related tests and SKPFM measurement are available in previous studies [16,17]. Figure 1a,b show the scanning electron microscopy (SEM) micrographs of the extruded ZK60 and ZKC601 alloys, respectively.…”

Section: Methodsmentioning

confidence: 99%

Influence of Intermetallic Particles on the Corrosion Properties of Extruded ZK60 Mg Alloy Containing Cu

Baek

Kim

2018

Metals

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The microstructure and corrosion behavior of the extruded ZK60 Mg alloys with different Cu content were comparatively investigated. The ZK60 alloy had a microstructure consisting of α-Mg grains with intermetallic MgZn 2 and Zn 2 Zr 3 particles. The addition of 1 wt % Cu resulted in the additional presence of CuMgZn particles. In a 0.6 M NaCl solution at 25 • C, the corrosion rate of the alloy with the added Cu appeared to be about 16% faster than that of the alloy without the addition of Cu. The factors affecting the degraded corrosion resistance of the Cu-added ZK60 alloy are discussed.

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“…As shown in Figure 5a, the Al/Fe ratio of the particles determined by EPMA was about 3.25, which was close to the composition of Al13Fe4. According to the Mg-Fe phase diagram and isothermal section of Mg-Al-Fe shown in Figure 1c and Figure 3b, respectively, we can see that the solid solubility of Fe in Mg was very limited, indicating that the Fe atoms would precipitate as Al-Fe phases [22,70,71]. To analyze the effect of Mn addition on the microstructure, it was crucial to identify the type and investigate the composition and morphologies of particles in the alloys.…”

Section: Microstructure Observationmentioning

confidence: 99%

Effect of Manganese on Microstructure and Corrosion Behavior of the Mg-3Al Alloys

Shan

Liu

Zeng

et al. 2019

Metals

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Microstructure and corrosion behavior of the Mg-3Al-xMn (x = 0, 0.12, 0.21, 0.36, 0.45) (hereafter in wt.%) alloys were experimentally investigated by electron probe microanalysis (EPMA), scanning electron microscope equipped with energy dispersive X-ray spectroscopy (SEM/EDX), X-ray diffraction (XRD), electrochemical, and hydrogen evolution tests. A new self-constructed Mg-Al-Mn-Fe thermodynamic database was used to predict the solidification paths of the alloys. The addition of Mn showed no grain refinement in the cast Mg-3Al alloys. According to the microstructure observation, Al-Fe phases were observed in the non-Mn-added alloy, while Al8Mn5(LT) (Al8Mn5 in low temperature) became the main intermetallic phase in the Mn-added alloys, and the amount increased gradually with the Mn addition. The τ–Al0.89Mn1.11 phase with lower Al/(Fe + Mn) ratio was observed in the alloys with 0.36 and 0.45 wt.% Mn content. According to the electrochemical tests, all five alloys showed localized corrosion characteristics in 3.5 wt.% NaCl solution. Compared with the Mg-3Al alloy, the corrosion resistance of Mn-added alloys were significantly improved and increased gradually with the Mn addition, which was due to the variation of Al-containing intermetallic compounds. The present experimental investigations and thermodynamic calculations confirmed the mechanism that the increasing amount of Al8Mn5(LT) with Mn addition could encapsulate the B2-Al(Mn,Fe) phase with higher Fe. Therefore, it could prevent this detrimental phase from contacting magnesium matrix, thus suppressing micro-galvanic corrosion and improving corrosion resistance gradually.

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Influence of alloyed Al on the microstructure and corrosion properties of extruded Mg–8Sn–1Zn alloys

Cited by 32 publications

References 30 publications

Influence of Alloyed Ga on the Microstructure and Corrosion Properties of As-Cast Mg–5Sn Alloys

Influence of Alloyed Ga on the Microstructure and Corrosion Properties of As-Cast Mg–5Sn Alloys

Influence of Intermetallic Particles on the Corrosion Properties of Extruded ZK60 Mg Alloy Containing Cu

Effect of Manganese on Microstructure and Corrosion Behavior of the Mg-3Al Alloys

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