 Help me ID the coating, AA floor pans |
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| Superhawk996 |
 Dec 16 2020, 08:25 AM
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#1
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914 Guru  Group: Members Posts: 5,825 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch 
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Have a mystery on my hands.
I ordered both floor pans from AA. Ordered within a couple months of each other back around August 2018. Floor pan on the right is clearly Galvanneal -- uniform grey coating of zinc that is annealed into the sheetmetal. Doesn't rust when left exposed or where it has localized scratches to bare metal. You'll notice on bottom of right side panel there is a little primer mist over the seat brackets, seat reinforcements, and the pedal box reinforcement where the parts were spot welded together. This makes sense to protect the welds from rusting in storage.  Floorpan on left was shipped with light coating of primer over 100% of both sides of the panel. I set them aside not paying much attention. Now that I'm getting ready to install I've noticed some differences. The primer is laquer based and needs to be removed before I primer with 2K Epoxy. Upon removing the primer the metal is mottled in appearance.  Some sections are clearly coated 100% (with something) while other areas are mostly uncoated. Under the primer i've found the start of very, very minor surface rust. Not huge amounts, but enough that it makes no sense to prime these without 1st treating with Ospho to remove the surface rust. Painting over rust never makes sense. The coating is clearly not zinc based otherwise the surface rust wouldn't be there and the zinc would be serving as the sacrificial annode. So not Galvanneal and not Galvanized.  So the mystery is what is the coating? I think it is some sort of aluminized steel. It's definately not paint and seems to be metalurgically bonded to the steel but yet offers no corrosion protection to the exposed mottled surface. Any other guesses? |
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| mate914 |
Dec 16 2020, 08:41 AM
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#2
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Matt Group: Members Posts: 749 Joined: 27-February 09 From: Eagles mere, PA Member No.: 10,102 Region Association: North East States
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QUOTE(Superhawk996 @ Dec 16 2020, 09:25 AM)  Have a mystery on my hands. I ordered both floor pans from AA. Ordered within a couple months of each other back around August 2018. Floor pan on the right is clearly Galvanneal -- uniform grey coating of zinc that is annealed into the sheetmetal. Doesn't rust when left exposed or where it has localized scratches to bare metal. You'll notice on bottom of right side panel there is a little primer mist over the seat brackets and reinforcements where the parts were spot welded together. This makes sense to protect the welds from rusting in storage. Floorpan on left was shipped with light coating of primer over 100% of both sides of the panel. I set them aside not paying much attention. Now that I'm getting ready to install I've noticed some differences. The primer is laquer based and needs to be removed before I primer with 2K Epoxy. Upon removing the primer the metal is mottled in appearance. Some sections are clearly coated 100% while other areas are mostly uncoated. Under the primer i've found the start of very, very minor surface rust. Not huge amounts, but enough that it makes no sense to prime these without 1st treating with Ospho to remove the surface rust. Painting over rust never makes sense. The coating is clearly not zinc based otherwise the surface rust wouldn't be there and the zinc would be serving as the sacrificial annode. So not Galvanneal and not Galvanized. So the mystery is what is the coating? I think it is some sort of aluminized steel. It's definately not paint and seems to be metalurgically bonded to the steel but yet offers no corrosion protection to the exposed mottled surface. Any other guesses? Try a good degreaser.... |
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| Superhawk996 |
Dec 16 2020, 08:51 AM
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#3
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914 Guru Group: Members Posts: 5,825 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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Already degreased as shown. |
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| VaccaRabite |
Dec 16 2020, 09:02 AM
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#4
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En Garde! Group: Admin Posts: 13,444 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Did you intend to add pictures? The spacing seems like there should be pictures but I'm not seeing them.
Zach |
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| Superhawk996 |
Dec 16 2020, 09:09 AM
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#5
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914 Guru Group: Members Posts: 5,825 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(VaccaRabite @ Dec 16 2020, 10:02 AM) Did you intend to add pictures? The spacing seems like there should be pictures but I'm not seeing them. Zach Thanks Zach. Clearly I'm brain dead this morning. Accidentally deleted them while deleting from the duplicate post. (IMG:style_emoticons/default/chair.gif) |
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| mepstein |
Dec 16 2020, 09:26 AM
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#6
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914-6 GT in waiting Group: Members Posts: 19,272 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Maybe one is older stock than the other.
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| bdstone914 |
Dec 16 2020, 10:04 AM
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#7
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bdstone914 Group: Members Posts: 4,522 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
AA may be carrying some parts from Restoraion Designs metal which is galvannial. Posablly Stoddard brand as they make a left and right pan vs front and rear as does Dansk. I would call and ask they the coating.
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