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Corrosion behaviors of Al-Si-Cu-based filler metals and 6061-T6 brazements

Su, T.L. / Wang, S.S. / Tsao, L.C. / Chang, S.Y. / Chuang, T.H. / Yeh, M.S.

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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Corrosion behaviors of Al-Si-Cu-based filler metals and 6061-T6 brazements

Su, T.L. / Wang, S.S. / Tsao, L.C. / Chang, S.Y. / Chuang, T.H. / Yeh, M.S.

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.

Corrosion behaviors of Al-Si-Cu-based filler metals and 6061-T6 brazements

Su, T.L. / Wang, S.S. / Tsao, L.C. / Chang, S.Y. / Chuang, T.H. / Yeh, M.S.

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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Title:

Corrosion behaviors of Al-Si-Cu-based filler metals and 6061-T6 brazements

Contributors:

Su, T.L. (author) / Wang, S.S. (author) / Tsao, L.C. (author) / Chang, S.Y. (author) / Chuang, T.H. (author) / Yeh, M.S. (author)

Published in:

Journal of Materials Engineering and Performance ; 11 ; 187-193

Publication date:

2002

Size:

7 Seiten, 9 Quellen

ISSN:

DOI:

https://doi.org/10.1361/105994902770344259

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Aluminiumlegierung , Grübchenbildung , Hartlöten , Verbindungsstelle , Stromdichte , Eutektikum , Bindefestigkeit , Lötgut , Lötverbindung , Lötwerkstoff

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