Corrosion Behaviour of Bulk Amorphous and Crystalline Zr&lt;sub&gt;55&lt;/sub&gt;Al&lt;sub&gt;10&lt;/sub&gt;Cu&lt;sub&gt;30&lt;/sub&gt;Ni&lt;sub&gt;5&lt;/sub&gt; Alloys at Ambient and Elevated Temperature

Buchholz, Kami; Gebert, A.; Mummert, K.; Eckert, Jürgen; Schultz, L.

doi:10.4028/www.scientific.net/msf.343-346.213

Cited by 3 publications

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“…In contrast, most, if not all, of the studies of BMG electrochemical behavior have found that amorphous alloys from many different systems are susceptible to localized corrosion. In many of these cases, the sources of pit initiation were determined to be non-ideal BMG castings that contained dispersions of inhomogeneities such as oxides or crystalline inclusions in amorphous matrices, which are commonly formed during the casting process through heterogeneous nucleation at oxygen impurities [51,[53][54][55][56]. Defects in the passive film due to these inhomogeneities serve as active sites for chloride-ion attack and result in penetration of the passive film.…”

Section: Discussionmentioning

confidence: 99%

Electrochemical behavior of a Ti-based bulk metallic glass

Morrison¹,

Buchanan²,

Peker³

et al. 2007

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 99%

Electrochemical behavior of a Ti-based bulk metallic glass

Morrison¹,

Buchanan²,

Peker³

et al. 2007

Journal of Non-Crystalline Solids

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Corrosion Behavior

Green¹,

Liaw²,

Buchanan³

2008

Bulk Metallic Glasses

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Electrochemical Reactivity of Zirconium-Based Bulk Metallic Glasses

et al. 2003

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Amorphous Zr-(Ti)-(Nb)-Al-Cu-Ni alloy samples were prepared by melt-spinning and copper mould casting in an argon atmosphere and characterized regarding their microstructure and thermal behavior. Their anodization behavior in aqueous environments with pH= 0.5 – 13 was studied by electrochemical polarization techniques in combination with surface analytical investigations, i.e. SEM/EDX, AES. In chloride-containing solutions the macroscopic corrosion resistance of bulk amorphous alloys is affected by the presence of heterogeneities, such as concentrated cluster zones of selected components or crystalline defects. Pitting phenomena are studied in neutral and acidic chloride solutions and as a result a local corrosion mechanism is proposed. The cathodic reactivity of alloy samples at different microstructural states and after pre-etching in fluoride solutions was investigated. After pre-etching melt-spun amorphous samples exhibit a significant increase in surface reactivity as expressed by a drastic increase in electrochemical capacities and in cathodic current densities as well as by a significant reduction of overpotentials for the hydrogen reduction reaction. The hydrogen sorption behavior was studied on samples galvanostatically charged at various cathodic current densities by means of XRD, DSC, TEM and thermal desorption analysis TDA. At room temperature Zr-based alloys absorb hydrogen up to H/M=1.65 mainly by interstitial solution of hydrogen atoms in the amorphous structure. The effect of absorbed hydrogen on the thermal stability and the crystallization behavior is described.

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Corrosion Behaviour of Bulk Amorphous and Crystalline Zr<sub>55</sub>Al<sub>10</sub>Cu<sub>30</sub>Ni<sub>5</sub> Alloys at Ambient and Elevated Temperature

Cited by 3 publications

References 0 publications

Electrochemical behavior of a Ti-based bulk metallic glass

Electrochemical behavior of a Ti-based bulk metallic glass

Corrosion Behavior

Electrochemical Reactivity of Zirconium-Based Bulk Metallic Glasses

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