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| Abstract No.: |
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Scheduled at:
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Wednesday, May 05, 2021, Hall 1 2:00 PM
Testing and Design
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| Title: |
A SWAAT procedure based on time to perforation and its use for studying the effect of metallurgical and process parameters on corrosion resistance of automotive brazing sheets
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| Authors: |
Lionel Peguet / Constellium Technology Center, France
Hanane Noui / Constellium C-TEC, France
Florian Raffin/ Constellium C-TEC, France
Diana Koschel*/ Constellium C-TEC, France
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| Abstract: |
The SWAAT accelerated test (ASTM G85A3) is extensively used to evaluate aluminium brazing sheet corrosion performance. Both corrosion morphology and attack depth quality factors are generally considered. However, the time to perforation is a more relevant test criterion considering that leakage in field service better characterizes the lifetime of any automotive heat exchanger. In order to investigate the evolution of perforation kinetics, a transparent adhesive tape was used to cover the back side of brazing sheet samples before being placed in a climatic chamber and exposed to a SWAAT environment. The blister initiations visible on the taped back side, corresponding to perforations, were counted on a daily basis. The comparison of the cumulated number of perforations as a function of the SWAAT duration was found much more discriminant compared to a simple cross section examination. Specifically, state-of-the-art Long Life as well as advanced KoolX® multi layered brazing sheets were investigated with the aim to study various methodology, material and process related parameters among which: (1) the sample exposure angle (2) the material gauge (3) the cladding architecture including the presence of clad on one or both sides and the presence of an interlayer (4) the effect of residual flux.
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