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Integration of electrochemical and synchrotron-based X-ray techniques for in-situ investigation of aluminum anodization

Zhang, Fan LU ; Evertsson, Jonas LU ; Bertram, Florian LU ; Rullik, Lisa LU ; Carla, Francesco; Långberg, Marie; Lundgren, Edvin LU and Pan, Jinshan (2017) In Electrochimica Acta 241. p.299-308
Abstract

Anodization of aluminum alloys AA 6082 and AA 7075 was investigated in-situ with integrated electrochemical and synchrotron-based X-ray reflectivity (XRR) methods providing complementary information about the anodic processes taking place on the alloys. The stepwise potentiostatic polarization measurements reveal dynamic processes of the anodic oxide formation and dissolution, and the following electrochemical impedance spectroscopy measurements detect the break of the native oxide and the growth of typical two-layer anodic oxide film, while the XRR measurements show the growth of entire anodic oxide film whose thickness increases linearly with the increasing applied potential. The results indicate that while a stable anodic oxide can... (More)

Anodization of aluminum alloys AA 6082 and AA 7075 was investigated in-situ with integrated electrochemical and synchrotron-based X-ray reflectivity (XRR) methods providing complementary information about the anodic processes taking place on the alloys. The stepwise potentiostatic polarization measurements reveal dynamic processes of the anodic oxide formation and dissolution, and the following electrochemical impedance spectroscopy measurements detect the break of the native oxide and the growth of typical two-layer anodic oxide film, while the XRR measurements show the growth of entire anodic oxide film whose thickness increases linearly with the increasing applied potential. The results indicate that while a stable anodic oxide can be formed on the both alloys with a similar growth factor, AA 7075 shows a thinner thickness of the barrier layer and a lower resistance of the oxide film. The electrochemical results suggest both localized and uniform anodic dissolution processes, which are more pronounced on AA 7075, demonstrating the effect of alloying elements on the growth of anodic oxides.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aluminum alloys, Anodization, Electrochemical techniques, Synchrotron, X-ray reflectivity
in
Electrochimica Acta
volume
241
pages
10 pages
publisher
Pergamon
external identifiers
  • scopus:85018737194
  • wos:000403026700031
ISSN
0013-4686
DOI
10.1016/j.electacta.2017.04.154
language
English
LU publication?
yes
id
b6d12532-0eeb-49b6-83e0-9a7996e87f61
date added to LUP
2017-05-23 14:11:18
date last changed
2018-06-10 05:19:06
@article{b6d12532-0eeb-49b6-83e0-9a7996e87f61,
  abstract     = {<p>Anodization of aluminum alloys AA 6082 and AA 7075 was investigated in-situ with integrated electrochemical and synchrotron-based X-ray reflectivity (XRR) methods providing complementary information about the anodic processes taking place on the alloys. The stepwise potentiostatic polarization measurements reveal dynamic processes of the anodic oxide formation and dissolution, and the following electrochemical impedance spectroscopy measurements detect the break of the native oxide and the growth of typical two-layer anodic oxide film, while the XRR measurements show the growth of entire anodic oxide film whose thickness increases linearly with the increasing applied potential. The results indicate that while a stable anodic oxide can be formed on the both alloys with a similar growth factor, AA 7075 shows a thinner thickness of the barrier layer and a lower resistance of the oxide film. The electrochemical results suggest both localized and uniform anodic dissolution processes, which are more pronounced on AA 7075, demonstrating the effect of alloying elements on the growth of anodic oxides.</p>},
  author       = {Zhang, Fan and Evertsson, Jonas and Bertram, Florian and Rullik, Lisa and Carla, Francesco and Långberg, Marie and Lundgren, Edvin and Pan, Jinshan},
  issn         = {0013-4686},
  keyword      = {Aluminum alloys,Anodization,Electrochemical techniques,Synchrotron,X-ray reflectivity},
  language     = {eng},
  month        = {07},
  pages        = {299--308},
  publisher    = {Pergamon},
  series       = {Electrochimica Acta},
  title        = {Integration of electrochemical and synchrotron-based X-ray techniques for in-situ investigation of aluminum anodization},
  url          = {http://dx.doi.org/10.1016/j.electacta.2017.04.154},
  volume       = {241},
  year         = {2017},
}