Journal
CORROSION SCIENCE
Volume 52, Issue 5, Pages 1711-1720Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2010.01.027
Keywords
Zirconium; Alloy; AES; Amorphous structures; Passivity; Pitting corrosion
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Zr-based metallic glasses passivate spontaneously, but exhibit also a certain pitting susceptibility. On the example of the Zr59Ti3Cu20Al10Ni8 alloy studied in 0.01 M Na2SO4 + x M NaCl (x = 0-0.1) electrolytes it is demonstrated that the surface finishing state and the pre-exposure conditions can significantly influence the free corrosion and anodic polarisation behaviour. Mechanical fine-polishing procedures can lead to extremely smooth topographies but also to Cu enrichment at the surface. This yields a pronounced Cu dissolution at low anodic polarisation prior to stable passivity and increases the pitting initiation susceptibility as compared to mechanically ground surface states. (C) 2010 Elsevier Ltd. All rights reserved.
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