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!

  • 1
    $\begingroup$ there's soe mention of alodine and other coatings in this answer to Cubesat surface material $\endgroup$
    – uhoh
    Sep 5, 2021 at 10:06
  • 1
    $\begingroup$ Thanks for the link @uhoh! $\endgroup$
    – Jon
    Sep 5, 2021 at 11:59


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