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Comparing the pitting corrosion behavior of prominent Zr-based bulk metallic glasses

Five well-known Zr-based alloys of the systems Zr–Cu–Al–(Ni–Nb, Ni–Ti, Ag) (Cu 5 15.4–36 at.%) with the highest glass-forming ability were comparatively analyzed regarding their pitting corrosion resistance and repassivation ability in a chloride-containing solution. Potentiodynamic polarization measurements were conducted in the neutral 0.01 M Na₂SO₄ 1 0.1 M NaCl electrolyte and local corrosion damages were subsequently investigated with high resolution scanning electron microscopy (HR-SEM) coupled with energy dispersive x-ray spectroscopy (EDX). Both pitting and repassivation potential correlate with the Cu concentration, i.e., those potentials decrease with increasing Cu content. Pit morphology is not composition dependent: while initially hemispherical pits then develop an irregular shape and a porous rim. Corrosion products are rich in Cu, O, and often Cl species. A combination of low Cu and high Nb or Ti contents is most beneficial for a high pitting resistance of Zr-based bulk metallic glasses. The bulk glassy Zr₅₇Cu₁₅.₄Al₁₀Ni₁₂.₆Nb₅ (Vit 106) and Zr₅₂.₅Cu₁₇.₉Al₁₀Ni₁₄.₆Ti₅ (Vit 105) alloys exhibit the highest pitting resistance.

Identiferoai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:70547
Date17 April 2020
CreatorsGostin, Petre Flaviu, Eigel, Dimitri, Grell, Daniel, Eckert, Jürgen, Kerscher, Eberhard, Gebert, Annett, Scudino, S., Yang, C., Eckert, J.
PublisherCambridge University Press
Source SetsHochschulschriftenserver (HSSS) der SLUB Dresden
LanguageEnglish
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text
Rightsinfo:eu-repo/semantics/openAccess
Relation0884-2914, 2044-5326, 10.1557/jmr.2014.371, info:eu-repo/grantAgreement/Deutsche Forschungsgemeinschaft/SPP 1594/224063632//Spannungs- und Schwingungsrisskorrosion in Zr-basierten massiven metallischen Gläsern

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