Abstract
The influence of an anodic oxide surface film on the nickel-aluminum reaction at the surface of aluminum brazing sheet has been investigated. Samples were anodized in a barrier-type solution and subsequently sputtered with nickel. Differential scanning calorimetry (DSC) and metallography were used as the main investigative techniques. The thickness of the anodic film was found to control the reaction between the aluminum substrate and nickel coating. Solid-state formation of nickel-aluminum intermetallic phases occurred readily when a relatively thin oxide film (13 to 25 nm) was present, whereas intermetallic formation was suppressed in the presence of thicker oxides (~60 nm). At an intermediate oxide film thickness of ~35 nm, the Al3Ni phase formed shortly after the initiation of melting in the aluminum substrate. Analysis of DSC traces showed that formation of nickel-aluminum intermetallic phases changed the melting characteristics of the aluminum substrate, and that the extent of this change can be used as an indirect measure of the amount of nickel incorporated into the intermetallic phases.
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Acknowledgments
The authors would like to acknowledge to financial support and in-kind contributions of the National Sciences and Engineering Research Council (NSERC), Initiative for Automotive Manufacturing Innovation (IAMI), and the financial and in-kind contributions of DANA Canada Corporation, Oakville, ON. The technical knowledge and support provided by Mark Whitney and Massimo Di Cano at the University of Waterloo and Feng Liang at Dana Canada were very much appreciated. The in-kind contributions of Dr. Richard Barber and Alireza Tari at the Giga-to-Nanoelectronics (G2N) Centre at the University of Waterloo were also much appreciated.
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Manuscript submitted May 5, 2016.
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Tadgell, C.A., Wells, M.A., Corbin, S.F. et al. The Effect of Anodic Oxide Films on the Nickel-Aluminum Reaction in Aluminum Braze Sheet. Metall Mater Trans A 48, 1236–1248 (2017). https://doi.org/10.1007/s11661-016-3922-8
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DOI: https://doi.org/10.1007/s11661-016-3922-8