Corrosion behaviors of Al-Si-Cu-based filler metals and 6061-T6 brazements |
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Authors: | T L Su S S Wang L C Tsao S Y Chang T H Chuang M S Yeh |
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Affiliation: | (1) Institute of Materials Science and Engineering, National Taiwan University, 106 Taipei, Taiwan;(2) Department of Mechanical Engineering, Chung-Hua University, 300 Hsin-Chu, Taiwan |
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Abstract: | The corrosion behaviors of a series of Al-Si-Cu-based filler metals and the 6061-T6 butt joints brazed with these filler metals
are evaluated by polarization tests and immersion tests in a 3.5% NaCl aqueous solution. For comparison, a traditional Al-12Si
filler metal is also employed. The results indicate that the Al-Si-Cu-based filler metals before brazing possess much higher
corrosion current densities and pitting tendencies than the Al-12Si filler metal. However, brazing of the 6061-T6 alloy with
an Al-12Si filler metal produces a wider butt joint, which, in this case, creates a more extensive corrosion region. Severe
galvanic corrosion occurs at the 6061-T6 joints when brazed with Al-Si-Cu-based filler metals. However, in the case of the
6061-T6/Al-12Si brazements, selective corrosion of the Al-12Si eutectic phase can be observed. The bonding strengths of the
6061-T6 butt joints brazed with various filler metals are also measured before and after the immersion tests. |
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Keywords: | Al-Si-Cu-based filler metals corrosion 6061-T6 brazements |
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