The influence of T78 overaging treatment on the corrosion behavior of Al 6056 (UNS A96056) in 1 M sodium chloride (NaCl) solution was investigated. The overaged alloy presented the same localized corrosion mechanisms as Al 6056-T6. However, Al 6056-T78 coarse intermetallic Al-Mg-Si-containing particles were found to be more reactive than those in the Al 6056-T6 alloy and were nucleation sites for pits. Pitting and intergranular corrosion were dependent upon each other; intergranular corrosion nucleated on pit walls. A quantitative study showed that T78 overaging of Al 6056 offered a better resistance to intergranular corrosion compared to T6 peak-aging treatment. The overaged alloy will be able to replace the traditional Al 2024 (UNS A92024) because of the efficiency of this overaging treatment

Subject
Pits, Precipitates, Transmission electron microscopy, Corrosion attacks, Sodium chloride solution, Pitting, Immersion, Aluminum alloys, Polarization, Grain boundary, Alloys, Intergranular corrosion, Corrosion potential
Keywords:
Al 6056, intergranular corrosion, intermetallics, localized corrosion, overaging, pitting corrosion, sodium chloride, UNS A96056
NACE International
2000
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