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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus


IMPACT FACTOR 2017: 1.144
5-year IMPACT FACTOR: 1.144

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SCImago Journal Rank (SJR) 2017: 0.495
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Online
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2196-7156
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Volume 230, Issue 9

Issues

Repassivation Investigations on Aluminium: Physical Chemistry of the Passive State

Tristan Oliver Nagy
  • Corresponding author
  • Department of Physical Chemistry, University of Vienna, Währingerstraße 42, A-1090 Vienna, Austria
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/ Morris Jhängi Joseph Weimerskirch / Ulrich Pacher
  • Department of Physical Chemistry, University of Vienna, Währingerstraße 42, A-1090 Vienna, Austria
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/ Wolfgang Kautek
  • Department of Physical Chemistry, University of Vienna, Währingerstraße 42, A-1090 Vienna, Austria
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Published Online: 2016-07-01 | DOI: https://doi.org/10.1515/zpch-2016-0001

Abstract

We show the temporal change in repassivation mechanism as a time-dependent linear combination of a high-field model of oxide growth (HFM) and the point defect model (PDM). The observed switch in transient repassivation current-decrease under potentiostatic control occurs independently of the active electrode size and effective repassivation time for all applied overpotentials.

For that, in situ depassivation of plasma electrolytically oxidized (PEO) coatings on aluminium was performed with nanosecond laser pulses at 266 nm and the repassivation current transients were recorded as a function of pulse number.

A mathematical model combines the well established theories of oxide-film formation and growth kinetics, giving insight in the non linear transient behaviour of micro-defect passivation.

According to our findings, the repassivation process can be described as a charge consumption via two concurrent channels. While the major current-decay at the very beginning of the fast healing oxide follows a point-defect type exponential damping, the HFM mechanism supersedes gradually, the longer the repassivation evolves. Furthermore, the material seems to reminisce former laser treatments via defects built-in during depassivation, leading to a higher charge contribution of the PDM mechanism at higher pulse numbers.

Keywords: Laser-Depassivation; Current Transients; Aluminium; High Field Model; Point-Defect Model; Oxide-Growth

About the article

Accepted: 2016-05-04

Received: 2015-12-31

Published Online: 2016-07-01

Published in Print: 2016-09-28


Citation Information: Zeitschrift für Physikalische Chemie, Volume 230, Issue 9, Pages 1303–1327, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1515/zpch-2016-0001.

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[1]
N. Lasemi, U. Pacher, L.V. Zhigilei, O. Bomati-Miguel, R. Lahoz, and W. Kautek
Applied Surface Science, 2017

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