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

Journal article (2017)

Authors

F. Norouzi Afshar Kavli institute of nanoscience Delft, Material Innovation Institute (M2i)
F.D. Tichelaar QN/Zandbergen Lab , Kavli institute of nanoscience Delft
A. M. Glenn CSIRO Mineral Resources
P. Taheri (OLD) MSE-6
M. Sababi (OLD) MSE-6
H.A. Terryn Vrije Universiteit Brussel, (OLD) MSE-1
J.M.C. Mol (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: https://doi.org/10.5006/2210
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Published Date

2017

Language

English

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Research Group

(OLD) MSE-6

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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- Embargo expired in 31-03-2017