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green scotchbrite and corrosion

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mcr01steiner(at)mac.com
Guest

Posted: Thu Feb 09, 2006 12:12 pm Post subject: green scotchbrite and corrosion

The operating instructions that came  with the Sanchem Safegard CC-6100 state to use the provided abrasive pad to prepare the surface. Since there was none supplied  I used some of the green stuff that I've bought at a local store. A couple of days after the conversion coating  treatment the parts looked like this:



  http://homepage.mac.com/csteiner/PhotoAlbum9.html . Looks like corrosion to me !



Any ideas what to do with these parts now? I' ve treated the stabilizer skeleton parts and riveted them befor I noticed the problem.



Christoph Steiner

601 XL



Am Montag, 06.02.06, um 22:01 Uhr (Europe/Zurich) schrieb Thilo Kind:






Green dust??? Sounds, like you are using the green Scotchbrite. No good for

aluminum. Use only the darl red stuff.



Happy building



Thilo Kind

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steveadams

Joined: 10 Jan 2006
Posts: 191

Posted: Fri Feb 10, 2006 5:09 am Post subject: Re: green scotchbrite and corrosion

Classic green scotch-brite corrosion!  



Seriously, I am not familiar with the conversion coating system you are using. However, with alumiprep or alodine, if it is not rinsed well you can see similar white areas appear. Since this developed so quickly after the treatment, I would suspect a similar cause. I would try it again, making sure that you really rinse the parts well after the treatment.

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Jim.Weston(at)delta.com
Guest

Posted: Fri Feb 10, 2006 6:24 am Post subject: green scotchbrite and corrosion

I looked at your pictures.  That is what is called filliform corrosion.

The best way to stop it is to lightly sand the area with some 400 grit

wet/dry sandpaper then spray it with ACF50 or a similar product that is

meant for the treatment of corrosion.  Aircraft Spruce sells the ACF50

is spray cans or by the gallon to treat an entire aircraft.



By the way, filliform corrosion once started will continue to spread

like roots from a tree.  Don't use the part until you've killed the

corrosion.



Jim Weston

Concord, Ga. 



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