Improved corrosion resistance of aluminum brazing sheet by a post-brazing heat treatment

Journal Article (2017)
Author(s)

F. Norouzi Afshar (Material Innovation Institute (M2i), Kavli institute of nanoscience Delft)

F.D. Tichelaar (Kavli institute of nanoscience Delft, TU Delft - QN/Zandbergen Lab)

A. M. Glenn (CSIRO Mineral Resources)

P. Taheri (TU Delft - (OLD) MSE-6)

M. Sababi (TU Delft - (OLD) MSE-6)

H.A. Terryn (TU Delft - (OLD) MSE-1, Vrije Universiteit Brussel)

J. M.C. Mol (TU Delft - (OLD) MSE-6)

Research Group
(OLD) MSE-6
Copyright
© 2017 F. Norouzi Afshar, F.D. Tichelaar, A. M. Glenn, P. Taheri, M. Sababi, H.A. Terryn, J.M.C. Mol
DOI related publication
https://doi.org/10.5006/2210
More Info
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Publication Year
2017
Language
English
Copyright
© 2017 F. Norouzi Afshar, F.D. Tichelaar, A. M. Glenn, P. Taheri, M. Sababi, H.A. Terryn, J.M.C. Mol
Research Group
(OLD) MSE-6
Issue number
4
Volume number
73
Pages (from-to)
379-393
Reuse Rights

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Abstract

This work studies the influence of the microstructure on the corrosion mechanism and susceptibility of as-brazed aluminum sheet. Various microstructures are obtained using postbrazing heat treatments developed to enhance the corrosion resistance of an AA4xxx/AA3xxx brazing sheet. The heat treatment results in a decrease of the matrix Si content within the heat affected zone and an increase of the Si fraction in the α-Al(Fe-Mn)Si phase. Additionally, the effect of the heat treatment on the local electrochemical activity and corrosion properties are studied. The results indicate that the corrosion susceptibility of the as-brazed structure is diminished resulting from of an amendment of the local electrochemical behavior of the outer clad surface after the post-brazing heat treatment. Moreover, the potential difference between the clad material and core is increased, resulting in an improved sacrificial cathodic protection of the core by the re-solidified clad layer.

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