Effect of erbium addition on the corrosion behaviour of Mg–Al alloys

Rosalbino, Francesco; Angelini, Emma Paola Maria Virginia; Negri, S. De; Saccone, A.; Delfino, S.

doi:10.1016/j.intermet.2004.05.007

Cited by 101 publications

(59 citation statements)

References 15 publications

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“…[21][22][23] The reasons attributed to such improvement are (i) refining of Mg 17 Al 12 phase and formation of more continuous network, (ii) suppressing the formation of Mg 17 Al 12 phase by forming another intermetallic with Al which is less harmful to corroding -Mg matrix and (iii) added elements may incorporate into the protective film and thus increasing its stability. In this study, it can be seen from the microstructure that the addition of Sn to AZ51 alloy does not change the size and morphology of Mg 17 Al 12 phase.…”

Section: Immersion Test and Corrosion Morphologymentioning

confidence: 99%

Microstructure and Corrosion Properties of Mg-xSn-5Al-1Zn (x=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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Section: Immersion Test and Corrosion Morphologymentioning

confidence: 99%

Microstructure and Corrosion Properties of Mg-xSn-5Al-1Zn (x=0, 1, 5 and 9 mass%) Alloys

et al. 2010

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“…Rosalbino et al [10] attributed the improved passivity of Mg-Al-Er alloys to the incorporation of erbium in the corrosion products. Krishnamurthy et al [18] noted that the pseudopassivation behavior of rapidly solidified Mg-Y-Nd alloys was caused by yttrium and neodymium enrichment in the corrosion products.…”

Section: Corrosion Resistancementioning

confidence: 99%

“…The addition of rare earth elements is generally believed to have a beneficial effect on the corrosion resistance of magnesium alloys [7][8][9][10]. However, limited publications in the field have indicated that the effect of rare earth on the corrosion resistance of magnesium alloys has not been extensively studied yet.…”

Section: Introductionmentioning

confidence: 99%

Effect of cerium addition on microstructure and corrosion resistance of die cast AZ91 magnesium alloy

Song

Liu²,

Wang

et al. 2007

Materials & Corrosion

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A novel AZ91 Ce containing magnesium alloy characterized by excellent corrosion resistance is fabricated by adding rare earth Ce (cerium) in the form of a Mg-Ce master alloy. The metallographic investigation shows that Ce added to AZ91 can obviously decrease the size of b-Mg 17 Al 12 and forms Al 11 Ce 3 intermetallic compounds in the shape of fine needles. The corrosion tests and electrochemical measurements indicate that the corrosion resistance of AZ91 Ce containing magnesium alloy is obviously higher than that of AZ91. Furthermore, increasing the content of Ce in the magnesium alloy can further enhance the corrosion resistance. X-ray photoelectron spectroscopy (XPS) reveals that Ce can be incorporated into corrosion products in the form of CeO 2 in the course of corrosion. Based on the preliminary analysis, the addition of Ce can improve the corrosion resistance of AZ91 by decreasing the size of bMg 17 Al 12 and enhancing the protective effectiveness of corrosion products.

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“…The alloying additions include rare earth metals (RE), semimetals (Si, Sn, Pb), alkaline metals (Ca, Sr), etc. It is well known that the addition of RE is an effective way to improve the elevated-temperature mechanical properties and corrosion resistance of magnesium alloys [1][2][3][4][5][6]. It is also reported that the newly developed creep-resistant automotive engine block material AM-SC1 magnesium alloy has a corrosion performance comparable to AZ91 when subjected to an aggressive salt-spray environment or in galvanic-coupling environments [7].…”

Section: Introductionmentioning

confidence: 99%

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

Chen

Yan

et al. 2008

Materials & Corrosion

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Effects of Sn and Ca additions on microstructure, mechanical properties, and corrosion resistance of the as-cast Mg-6Zn-2Al-based alloy were investigated by SEM, XRD, tensile tests, electrochemical measurements, etc. The higher the Sn content, the higher the yield strength of the Mg-6Zn-2Al-based alloy. Trace Ca addition refined both grains and divorced eutectics in the Mg-Zn-Sn-Al alloys, leading to the best combination of strength and plasticity. Moreover, its influence was more significant for the alloy with a higher Sn content. Furthermore, the combined addition had a beneficial effect on the corrosion resistance improvement of the Mg-6Zn-2Al alloy. The Mg-6Zn-2Al-3Sn-0.2Ca alloy was the most corrosion-resistant alloy among the nine alloys studied, better than AZ91 and ZA85. It could be ascribed to the decrease and the refinement of divorced eutectics, the higher hydrogen overvoltage of Sn and the Ca grain refinement.

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Effect of erbium addition on the corrosion behaviour of Mg–Al alloys

Cited by 101 publications

References 15 publications

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

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

Effect of cerium addition on microstructure and corrosion resistance of die cast AZ91 magnesium alloy

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

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