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

F. Norouzi Afshar, F. D. Tichelaar, A. M. Glenn, P. Taheri, M. Sababi, H. Terryn, J. M.C. Mol*

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)
    280 Downloads (Pure)

    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.

    Original languageEnglish
    Pages (from-to)379-393
    JournalCorrosion: journal of science and engineering
    Volume73
    Issue number4
    DOIs
    Publication statusPublished - 2017

    Bibliographical note

    Accepted Author Manuscript

    Keywords

    • Aluminum alloy
    • Heat treatment
    • Kelvin probe
    • Microstructure
    • Transmission electron microscopy

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