Effect of manganese additions on the corrosion behavior of an extruded Mg–5Al based alloy

Nam, Nguyễn Đăng; Mathesh, Motilal; Forsyth, Maria; Jo, Deok Su

doi:10.1016/j.jallcom.2012.07.083

Cited by 58 publications

(19 citation statements)

References 65 publications

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“…Abidin et al [20] stated a difference between instantaneously or short time and steady state or long time measurements and mentioned that the application of the Tafel extrapolation might have measured a valid corrosion rate for the moment. In contrast, Thomaz et al [24] and Nam et al [25] said that the extrapolation of the cathodic curve leads to erroneous results.…”

Section: Literature Surveymentioning

confidence: 99%

The Influence of MgH2 on the Assessment of Electrochemical Data to Predict the Degradation Rate of Mg and Mg Alloys

Müeller

Hornberger

2014

IJMS

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Mg and Mg alloys are becoming more and more of interest for several applications. In the case of biomaterial applications, a special interest exists due to the fact that a predictable degradation should be given. Various investigations were made to characterize and predict the corrosion behavior in vitro and in vivo. Mostly, the simple oxidation of Mg to Mg2+ ions connected with adequate hydrogen development is assumed, and the negative difference effect (NDE) is attributed to various mechanisms and electrochemical results. The aim of this paper is to compare the different views on the corrosion pathway of Mg or Mg alloys and to present a neglected pathway based on thermodynamic data as a guideline for possible reactions combined with experimental observations of a delay of visible hydrogen evolution during cyclic voltammetry. Various reaction pathways are considered and discussed to explain these results, like the stability of the Mg+ intermediate state, the stability of MgH2 and the role of hydrogen overpotential. Finally, the impact of MgH2 formation is shown as an appropriate base for the prediction of the degradation behavior and calculation of the corrosion rate of Mg and Mg alloys.

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Section: Literature Surveymentioning

confidence: 99%

The Influence of MgH2 on the Assessment of Electrochemical Data to Predict the Degradation Rate of Mg and Mg Alloys

Müeller

Hornberger

2014

IJMS

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“…Cao et al [68] reported ε-AlMn could act as the nucleation site for (αMg) grains due to small lattice mismatch (~4% misfit) against (αMg), and Al 8 Mn 5 (LT) showed no grain refinement in their study due to the bigger lattice mismatch (~20% misfit). In addition, the grain refinement effect of Mn addition was observed in extruded or wrought Mg-Al alloys [18,19,50] and not observed in cast alloys [11,41,69]. This difference may relate to the thermal forming process.…”

Section: Microstructure Observationmentioning

confidence: 93%

“…Corrosion performance is one of the major concerns for applications of magnesium alloys [6,7]. Influences of alloy elements such as Ce [8,9], Nd [9][10][11][12][13], Zn [14,15], Y [11,16], Ca [11,17], and Mn [9,11,15,[18][19][20][21][22][23] on the corrosion behavior of magnesium alloys have been investigated widely in literature. It is widely admitted that Mn addition could combat impure Fe in Mg-Al alloys and reduce corrosion rates of the Mg-Al alloys [11,18,19].…”

Section: Introductionmentioning

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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“…The addition of Mnhas the potential to refine further the grains and improve the recrystallization temperature of Mg alloys. Earlier studies have shown that a small amount of Mn in Mg alloys can remove intractable impurities such as Fe and heavy metal elements forming intermetallic phases and thus improve corrosion characteristics [18,19], but the effect of Mn on Mg alloys has not yet been more thoroughly researched. *…”

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confidence: 99%

Electrochemical Analysis of Some Biodegradable Mg-Ca-Mn Alloys

2020

Rev.Chim.

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The potential benefits of magnesium (Mg) over the other non-resorbable biomaterials, especially for orthopedic applications, are obvious. When fully realized, functional bioresorbable implants based on Mg alloys offer the mechanical advantages of a metal combined with the degradable and biological advantages of polymers and biomaterials. <1>In this article we obtained aMg-based prelate alloyed with Ca and Mn. It is known that Mn helps to refine the alloy’s microstructure, which adds to the elasticity of the material. Surface morphology was performed using the optical microscope and the electron microscope while the mechanical tests were performed using the tribometer. Also, the electrochemical tests were executed in the ringer solution. It has been mentioned that the electrochemical resistance is quite low. This study was conducted to determine the corrosion resistance of Mg-Ca-Mn alloys. It has been demonstrated that the addition of Mn refines the microstructure, increases the modulus of elasticity but does not have a qualitative resistance to corrosion.Also, the hardness of the material is quite low in comparison to other pre-alloys of Mg. Keywords: Surface morphology,mechanical tests, electrochemical tests

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Effect of manganese additions on the corrosion behavior of an extruded Mg–5Al based alloy

Cited by 58 publications

References 65 publications

The Influence of MgH2 on the Assessment of Electrochemical Data to Predict the Degradation Rate of Mg and Mg Alloys

The Influence of MgH2 on the Assessment of Electrochemical Data to Predict the Degradation Rate of Mg and Mg Alloys

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

Electrochemical Analysis of Some Biodegradable Mg-Ca-Mn Alloys

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