Corrosion of Magnesium Alloys Containing Rare Earth Elements

Nakatsugawa, Isao; Kamado, Shigeharu; Kojima, Yo; Ninomiya, Ryuji; Kubota, Kayoko

doi:10.1515/corrrev.1998.16.1-2.139

Cited by 87 publications

(37 citation statements)

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“…Data concerning corrosion and electrochemical behaviour of Mg alloys are numerous [3][4][5][6][7][8][9][10][11][12][13][14], but those concerning Mg-RE alloys are scarce [15][16][17][18][19][20]. However, the latter data seem to indicate that, in addition to favourable high temperature properties, certain Mg-RE alloys present good corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Geary [16] measured a corrosion rate of 0.4 mm y )1 on WE43 in NaCl solution and reported that this alloy had the lowest maximum pit depth of all the Mg alloys tested. Nakatsugawa [17] compared the polarization curves of AZ91D and different Mg-RE alloys, WE54 included, recorded in 5% NaCl solution saturated with Mg(OH) 2 . The corrosion potentials of Mg-RE alloys were more negative than that of AZ91D, and the anodic curves of Mg-RE were characterized by a very high slope up to )1.65 V/ SCE , in contrast with AZ91D anodic curve.…”

Section: Introductionmentioning

confidence: 99%

“…The surface oxide enrichment in RE elements may also play a role by producing a more corrosion resistant film [19]. Nakatsugawa [17] assumed that the presence of RE accelerates the kinetics of MgH 2 formation, which works as a barrier against further magnesium dissolution.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical behaviour of a magnesium alloy containing rare earth elements

et al. 2005

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The corrosion of a magnesium alloy containing rare earth elements (WE43 type alloy) was studied in 0.05 and 0.5 M\ud Na2SO4 or 0.1 and 1 M NaCl solutions using electrochemical techniques: linear polarization resistance, potentiodynamic\ud polarization, impedance measurements. The electrolytes favoured anodic magnesium oxidation but the\ud presence of rare earth elements improved the tendency of magnesium to passivation. The dissolution rates in\ud chlorides were higher than in sulphates because chlorides, in contrast to sulphates, interfered with the formation and\ud maintenance of a protective layer of corrosion products which decreased the severity of the attack. The effects of\ud galvanic corrosion due to cathodic intermetallic precipitates at grain boundaries were particularly evident in\ud chloride media at long testing times

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical behaviour of a magnesium alloy containing rare earth elements

et al. 2005

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“…As one of the effective possible applications to the structural parts of an aircraft, high strength Mg-RE (Rare Earth element) based alloys have become attractive for the recent desires over the world. Mg-RE alloys have been well known as typical age-hardenable alloys, [1][2][3][4][5][6][7] and it is reported that simultaneous additions of gadolinium and yttrium bring about high strength at high temperature 8,9) and good corrosion resistance 10,11) in recent years. Furthermore, on the one hand, Kawamura et al developed rapidly solidified powder metallurgy (P/M) Mg 97 Zn 1 Y 2 alloys which have remarkable high strength (above 600 MPa) and rather high ductility.…”

Section: Introductionmentioning

confidence: 99%

Alloy Development of High Toughness Mg-Gd-Y-Zn-Zr Alloys

et al. 2006

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The effects of zinc addition on microstructure evolution and mechanical properties of Mg-Gd-Y-(-Zr) based alloys are investigated in details using OM, TEM, Vickers hardness tests and tensile tests. Specific line-shaped structure is formed inside of matrix grain in the as-cast specimen. This structure is dissolved after a solution-treatment at 773 K. Instead of it, in the 0.3-1Zn alloy, the 14H LPSO structure is observed at grain boundaries of Mg matrix phases after the solution heat treatment. Metastable 0 phase is formed during subsequent aging treatment at 498 K. The 14H LPSO structure is stable and remained even after the aging treatment. These structure and phase coexist at the peak-aged condition in the microstructure. In cast-specimens, 0.2% proof stress and tensile strength slightly decreases with an addition of zinc up to 0.75 mol% and rapidly decreases over 1 mol% zinc addition. On the contrary, in rolled-specimens, addition of 0.3-1 mol% zinc improves mechanical properties in both strength and ductility significantly. It is found that the UTSs reach more than 400 MPa in the 0.3-1Zn alloys. This characteristic effect is considered to be the contribution of LPSO structure and its specific orientation relationship with matrix phase.

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“…[3][4][5] The additions of heavy metal rare-earth (RE) elements such as Y, Gd, Dy, Tb and Nd to Mg alloy have been known to bring excellent tensile and creep properties as well as corrosion resistance after proper peak-aging treatment. [5][6][7][8][9][10] Recently, it was found that Zn plays a beneficial role in accelerating age hardening response and increasing peak strength for binary Mg alloys containing RE elements, Sn or Ca because the Zn addition gives rise to uniform and dense distribution of basal precipitates. 11,12) In spite of many works on role of Zn in microstructure and mechanical properties up to date, [13][14][15][16][17][18][19][20] the effect of Zn addition on the corrosion resistance of Mg-RE based alloys has been rarely investigated.…”

Section: Introductionmentioning

confidence: 99%

Influence of Zn Addition on Aging Response and Corrosion Resistance of Mg-Gd-Nd-Zr Alloy

2008

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The age hardening response and corrosion resistance of Mg-8%Gd-2%Nd-0.3%Zr alloys with various Zn contents up to 2% (in weight) have been investigated. The Zn-free alloy exhibits relatively lower age hardening and slower age response, whereas the addition of Zn enhances the age hardening response remarkably. The weight loss after salt spray test decreases with increasing Zn content in the peak-aged alloys, which is presumably associated with the increased amount of eutectic Mg-Zn-Nd-Gd phase acting as a corrosion barrier along the grain boundaries. The potentiodynamic polarization curves reveal that with the increase in Zn content, the value of I corr decreases gradually while the value of E corr increases.

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Corrosion of Magnesium Alloys Containing Rare Earth Elements

Cited by 87 publications

References 0 publications

Electrochemical behaviour of a magnesium alloy containing rare earth elements

Electrochemical behaviour of a magnesium alloy containing rare earth elements

Alloy Development of High Toughness Mg-Gd-Y-Zn-Zr Alloys

Influence of Zn Addition on Aging Response and Corrosion Resistance of Mg-Gd-Nd-Zr Alloy

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