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Traditionally, aluminium spacecraft structures have been alodine-coated to protect the surface from corrosion and resistance to scratches.

Alodined coating on satellite UHF/VHF receiver by Spaceteq

However, the last few years I've noticed that more and more structures are anodised instead. This confused me, because although it provides a corrosion-resistant non-conductive coating (not to mention a cool colour!), wouldn't a lot of outgassing occur from the anodise coating?

Anodised Ion Thruster by Orbion

Appreciate any insights. Thanks!

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