---------------------------------------------------------- Zenith-List Digest Archive --- Total Messages Posted Sat 11/08/08: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:53 AM - Fw: posting on matronics about corrosion (Bill Naumuk) 2. 05:47 PM - Re: Re: T-6 Corrosion Resistance (Ken Lilja) ________________________________ Message 1 _____________________________________ Time: 06:53:42 AM PST US From: "Bill Naumuk" Subject: Zenith-List: Fw: posting on matronics about corrosion All- Self-explanitory. Bill ----- Original Message ----- From: Bill Naumuk Sent: Saturday, November 08, 2008 9:50 AM Subject: Re: posting on matronics about corrosion Ben- I don't have any of the paper that covered the sheet, but I do have some of the paper which covered my welded fitments. I don't know for sure if they're the same, but I can't see Zenith stocking different types of kraft paper to wrap different parts. A sample of the sheet and of the paper are going out to you today. I've separated them to avoid possible cross contamination. In my estimation, you're an example of what every lister should strive to be. Someone committed to finding a logical engineering solution to a problem rather than one who endlessly speculates. Thanks for your efforts for the Z builder community. Bill ----- Original Message ----- From: Bill Naumuk To: Benjamin Church Sent: Friday, November 07, 2008 6:47 PM Subject: Re: posting on matronics about corrosion No, I don't. Sorry Bill ----- Original Message ----- From: Benjamin Church To: Bill Naumuk Sent: Thursday, November 06, 2008 10:24 PM Subject: Re: posting on matronics about corrosion Bill, If you have some of the original paper - send that too. I have some myself which is probably the same thing but the best bet would be to have the same paper that was on the corroded skins... - Ben ------------------------------------------------------------------------- --- From: Bill Naumuk To: Benjamin Church Cc: zenith list Sent: Thursday, November 6, 2008 5:20:28 PM Subject: Re: posting on matronics about corrosion Ben- Will do.The interesting thing is, the finished wings are still in the same basement with no corrosion- they're visible in the pictures I posted. The only problem I've ever had was with the stuff that came with the kit. Can the paper make that much of a difference? Bill ----- Original Message ----- From: Benjamin Church To: naumuk@alltel.net Sent: Wednesday, November 05, 2008 9:22 PM Subject: posting on matronics about corrosion Howdy Bill, Saw your posting on the Zenith list http://forums.matronics.com/viewtopic.php?t=50611 I was wondering if you might have a piece of that corroded aluminum left over. If you do, would you be willing to cut a piece of the worst-looking stuff and send it to me? Something the size of a business card or so would be plenty. If you send me some, I'll take it to work and do some analysis that might tell you what caused the corrosion. I'd be able to tell if it was biological, humidity, or caused by something else. I'm a materials engineer and so I have access to all kinds of analysis equipment at work. No guarantee I'll find a solid answer, but my time and effort is free so all you have to loose is a piece of corroded aluminum! I'm storing some parts in my basement, some in the living room, and some in the garage. I've been curious about corrosion during storage and so you're problem could provide some good evidence. Let me know. Regards, Ben Church CH801 - working on the wings 507 Melvin Ave Racine, WI 53402 ________________________________ Message 2 _____________________________________ Time: 05:47:29 PM PST US From: Ken Lilja Subject: Re: Zenith-List: Re: T-6 Corrosion Resistance Take a look at the metal with a magnifying glass and a bright flashlight. If there are no pits then it probably is just staining, not corrosion. Aluminum corrosion products are generally a white powder that is not too hard to remove. Try cleaning with some Alumiprep 33. This is what is used to prep for applying Alodine, painting or welding. The Alumiprep should foam up and bleach the surface to almost white. Flush with plenty of cold water. Remember to dilute with water as directed. You don't need to use Alodine afterwards unless you want to. A natural layer of aluminum oxide will form quickly and seal the surface back up. Not to open old threads but.... 3M maroon scotchbrite is aluminum oxide based and is OK on aluminum. Don't use silicon carbide sandpaper on AL. It can lead to corrosion (per AC43.13 2A) 3M offers an aluminum oxide wet or dry paper (Imperial) that is no more expensive, just had to find. I you want to see some impressive corrosion I could post a image of a Cessna wing mounting block with intergranular corrosion. Flat out 6061 is much more corrosion resistant than 2024. It is all we can do to prevent 2024 from corroding. Most single engine Cessnas prior to the 90's were not zinc chromated unless equipped to have floats. We have it easy. Ken Lilja ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message zenith-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Zenith-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/zenith-list Browse Digests http://www.matronics.com/digest/zenith-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.