Anodizing aluminium aircraft parts

The Zinkphosphat primer which I use to cover my aluminium parts usually takes days to cure. And even then the surface remains sensitive to scratching. The alternative: Anodizing. Self made.

So I watched some online tutorials on the subject before getting myself plastic buckets, the required chemical ingredients and a battery charger. The first attempt was a failure as the charger went up in smoke. The second attempt with a new charger but this time with a current modulator brought success. The modulator protects the charger from overload and allows for a precise control over the thicknes of the anodizing layer.
Meanwhile the parts come out in a nice and even coating.

Update 3.2.2021:
Before starting off I got myself smart in respect of the regulations about anodizing aircraft parts of course. I was confirmed that EASA rules permit this procedure. 
A just released KITPLANES article however talks a different language.
It appears that contrary to EASA ruling anodizing is not advisable for aircraft parts.

For my part I will refrain from this procedure for critical aluminium parts in the future.

Article in KITPLANES: https://www.kitplanes.com/error-chain-15/

1 thought on “Anodizing aluminium aircraft parts”

  1. Eloxieren, Projekt N-20.3 Arbalete

    meine Erfahrung mit der Eloxierung von Teilen ist folgende:
    Die Oberfläche ist sehr hart und reisst bei Biegung.
    Die dadurch entstehenden Risse an der Oberfläche begünstigen
    einen Bruch des Bauteils. Ich würde eher einen elastischen Lack
    verwenden als eine Eloxierung.
    MfG
    Peter Herzog
    (Metallbauer/ Bauing. FH/ PPL)

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