Influence of overaging treatment on localized corrosion of Al 6056

Journal Article · Sat Jan 01 00:00:00 EST 2000 · Corrosion (Houston)

DOI:https://doi.org/10.5006/1.3280517· OSTI ID:20014467

Gullaumin, V; Mankowski, G

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 because of the efficiency of this overaging treatment.

• Research Organization: UPRESA CNRS, Toulouse (FR)
• OSTI ID: 20014467
• Journal Information: Corrosion (Houston), Vol. 56, Issue 1; Other Information: PBD: Jan 2000; ISSN 0010-9312
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
33 ADVANCED PROPULSION SYSTEMS
ALUMINIUM BASE ALLOYS
CORROSION RESISTANCE
SODIUM CHLORIDES
CORROSIVE EFFECTS
INTERGRANULAR CORROSION
PITTING CORROSION
AGING
AIRCRAFT