How does aluminium behave in such an environment from a corrosion point of view?
Hydro Aluminium Precision Tubing: Aluminium has very low corrosion rates compared to materials like steel and copper. This is due to the protecting oxide layer that forms immediately on the surface when exposed to the environment. This is a general characteristic that applies to aluminium as “stand alone.” As part of a system, however, aluminium may corrode if the system is poorly engineered. For example, joining copper with aluminium in a humid environment is a less appropriate way of using aluminium. Granted, this may result in an acceptable lifetime, however, an all-aluminium solution will always prove superior to a copper/aluminium solution with respect to copper resistance.

Is aluminium better than copper with regard to corrosion?
Hydro Aluminium Precision Tubing: Aluminium has lower corrosion rates than copper in most environments. In cases where aluminium has shown excessive corrosion rates, this is most often a result of poorly designed systems in which aluminium plays the role as an anode in a galvanic element. This is, for example, the case in all heat exchangers where copper tubes are used together with aluminium fins. On the other hand, all-aluminium heat exchangers will show excellent corrosion characteristics that outperform traditional copper/aluminium heat exchangers by far in terms of corrosion resistance.