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Old 01-04-2019, 08:37 AM
guidoism's Avatar
guidoism guidoism is offline
Join Date: Dec 2013
Location: Louisville, KY
Posts: 45
Default Is this corrosion?

These parts sat in my garage in California about 10 miles from the ocean for several years. Ugh. I'm far away from the ocean now but dang, I was hoping that I wouldn't need to prime. I'll probably be scotchbriting this and killing my alclad, yes?

Guido Bartolucci - Louisville, KY - Bowman Field (KLOU)
RV-8 (N883G): Empennage Finished, Working on Wings
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Old 01-04-2019, 08:54 AM
sglynn's Avatar
sglynn sglynn is offline
Join Date: Mar 2008
Location: Anacortes, WA
Posts: 773
Default corrosion

Looks like lite corrosion. I primed my RV-7A. On my Cherokee, I would clean off the corrosion with lite scotch brite and spray with LP3 Corrosion X.
Steve Lynn
Flying Phase I
Anacortes, WA
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Old 01-04-2019, 09:59 AM
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JonJay JonJay is offline
Join Date: Jan 2007
Location: Battleground
Posts: 4,190

Surface oxidation, a type of very mild corrosion. It will clean right up and might even wipe off with a solvent and mild abrasive. It takes quite a bit of grunt to sand through the Alclad.
Nothing to worry about, but this is why the factory on QBís, and many builders use a wash primer. Just enough protection to keep this from happening.

It doesnít matter what your environment is, Alclad will eventually show signs of oxidation, it may take many, many years or it could happen in a few short weeks in a bad environment.
Smart People do Stupid things all the time. I know, I've seen me do'em.

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Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
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