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Per AC 43.13-1B the most common way to protect AL is by anodizing (orangeish
color.) I use alumiprep and  then alodine. I first sand the metal with a very
fine sandpaper -- otherwise the alodine doesn't penetrate what I assume is an
oxide already on most surfaces. I don't know if this is what everyone else does,
but it works for me. Alclad is AL alloy cladded with pure aluminum to prevent
corrosion -- you shouldn't have to mess with it. I have only seen powder coating
on steel parts, but I'm not all that experienced in aircraft construction.

Do not use this process on steel parts because this can strip the existing
protection or cause hydrogen embrittlement. You should clean a steel surface
with acetone and than spray with Zn Chromate Primer. It comes in two trendy
colors (puke yellow and rotten pea soup green.) Then you can then paint it if
you want the extra weight. Keep in mind that the lighter color will be easier to
detect flaws in down the road. Also don't breathe the primer fumes or you will
never see the project completed...


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Please send your photos and drawings to marvkaye@olsusa.com.
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