Effects of Sn and Ca additions on microstructure, mechanical properties, and corrosion resistance of the as‐cast Mg‐Zn‐Al‐based alloy

Chen, Jihua; Chen, Zhenhua; Yan, Hongge; Zhang, Fuquan; Yingliang, Cheng

doi:10.1002/maco.200805010

Cited by 36 publications

(13 citation statements)

References 21 publications

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“…Bearing in mind that the thickness of the native oxide film coating on the pure magnesium surface is very thin ( Table 3) and the absence of aluminium oxides, it may be speculated that the presence of a CaO layer on the magnesium surface has raised the R t values. These results show a certain similarity with those observed by Jihua et al [72], indicating that the trace Ca addition was beneficial to the corrosion resistance improvement of magnesium alloys.…”

Section: Eis Measurements Of Effect Of Calciumsupporting

confidence: 90%

Native Air-Formed Oxide Film and its Effect on Magnesium Alloys Corrosion

Galván¹

2010

TOCORRJ

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Abstract:The present work uses X-ray photoelectron spectroscopy (XPS) analysis to compare the chemical composition of native oxide films formed spontaneously on commercial pure magnesium and AZ31, AZ80 and AZ91D magnesium alloys. The study considers both the outer surface and inner regions of the films with the assistance of argon ion bombardment. Possible relationships are established between the alloy Al content and the native oxide film characteristics. The Al content is very similar in the oxide films on all three studied alloys. XPS identifies a much greater film thickness on AZ80 and AZ91D specimens than on AZ31 and pure Mg specimens, which seems to be related with the presence of phase (Mg 17 Al 12 ) on the AZ91D alloy surface and of the eutectic -Mg/ on the AZ80 alloy surface. Considerable Ca segregation is observed (directly related with the calcium impurities content in the bulk material) towards the outer surface of the metal, where it appears in the form of calcium oxide. Direct correspondence is found between the thickness of the native oxide film formed spontaneously on the surface of magnesium and its alloys and their subsequent corrosion resistance in exposure to a 3.5 wt% NaCl solution.

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Section: Eis Measurements Of Effect Of Calciumsupporting

confidence: 90%

Native Air-Formed Oxide Film and its Effect on Magnesium Alloys Corrosion

Galván¹

2010

TOCORRJ

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“…2f), and the logical absence of aluminium oxides on this surface, it may be speculated that the presence of a CaO layer on the magnesium surface is the cause of the considerably higher R t value. This would agree with the results of Jihua et al [53] indicating that trace Ca addition was beneficial to corrosion resistance improvement of magnesium alloys. …”

Section: Eis Measurements Of the Natural Oxide Film Formed In Contactsupporting

confidence: 83%

The Application of X-Ray Photoelectron Spectroscopy in Understanding Corrosion Mechanisms of Magnesium and Mg-Al Alloys

Sebastián¹

2011

TOSURSJ

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Abstract:The authors present a review of their research work on the application of X-ray photoelectron spectroscopy (XPS) to characterise thin (~ 3 nm) natural oxide films that spontaneously form on the surface of magnesium and its alloys in contact with the oxygen in air, and thick (> 1 μm) corrosion films rich in carbonates and other species that form during exposure to a humid atmosphere. The results obtained can provide much useful information about the protection mechanisms of these materials. Emphasis is placed on the relationship between the alloy's Al content and the characteristics of the natural oxide film and the relationship between segregation of calcium impurities from the bulk to the outer surface of the metal and repercussions on electrochemical behaviour. The natural oxide film may alone be sufficiently protective in less aggressive environments, making it of interest to know its characteristics. A detailed study will also be made of the changes in chemical composition that may occur in this passivating film with increasing exposure time to a humid atmosphere, deteriorating or reinforcing its anticorrosive properties. In particular, an attempt will be made to research the effect on corrosion behaviour of: (a) the time the different specimens are exposed to the aggressive agent (humid atmosphere); (b) the possible formation during corrosive attack of layers that are rich in carbonates and other species; and (c) the presence of aluminium (alloying element) on the protective properties of the corrosion layers.

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“…But the reason for this remained unclear, the similar phenomenon was also observed in the other literatures. 10,18) Electrochemical corrosion data of all alloys are listed in Table 2. Comparing with AZ51 alloy, the alloys with Sn addition had a corrosion potential ranging from À1:50 to À1:45 V vs. Ag/AgCl, about 10-60 mV higher than that of AZ51 alloy.…”

Section: Potentiodynamic Polarization Measurementmentioning

confidence: 99%

Microstructure and Corrosion Properties of Mg-<I>x</I>Sn-5Al-1Zn (<I>x</I>=0, 1, 5 and 9 mass%) Alloys

et al. 2010

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In the present work, the corrosion properties of Mg-xSn-5Al-1Zn (x ¼ 0, 1, 5 and 9 mass%) alloys have been investigated. Potentiodynamic polarization and immersion tests were carried out in 3.5% NaCl solution of pH 7.2 at room temperature to measure the corrosion properties of Mg-xSn-5Al-1Zn (x ¼ 0, 1, 5, and 9 mass%) alloys. Microstrucral analysis shows the Mg 17 Al 12 and Mg 2 Sn phase were mainly precipitated along grain boundaries. With increase of the Sn contents, the volume fraction of the secondary phases, i.e. Mg 17 Al 12 and Mg 2 Sn phase, was increased. The corrosion resistance of Mg-xSn-5Al-1Zn alloys was improved by the Sn addition. Especially, the AZ51-5 mass%Sn alloy characterized the superior corrosion resistance in the studied alloys. It seems that the presence of Sn stabilized the Mg(OH) 2 layers on the surface of Mg alloys and the secondary phases effectively formed semi-continuous structures, resulting in a drastic improvement of corrosion resistance of the Mg alloys.

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Effects of Sn and Ca additions on microstructure, mechanical properties, and corrosion resistance of the as‐cast Mg‐Zn‐Al‐based alloy

Cited by 36 publications

References 21 publications

Native Air-Formed Oxide Film and its Effect on Magnesium Alloys Corrosion

Native Air-Formed Oxide Film and its Effect on Magnesium Alloys Corrosion

The Application of X-Ray Photoelectron Spectroscopy in Understanding Corrosion Mechanisms of Magnesium and Mg-Al Alloys

Microstructure and Corrosion Properties of Mg-<I>x</I>Sn-5Al-1Zn (<I>x</I>=0, 1, 5 and 9 mass%) Alloys

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