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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26320
Location: Livermore CA USA
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 Posted: Sun Jul 13, 2014 10:28 am Post subject: Rusty RV-8 Steel Parts |
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I sent this email to Van's today. Something to watch out for...
| Quote: | Date: Sun, 13 Jul 2014 11:23:02 -0700
To: support(at)vansaircraft.com
From: Matt Dralle <dralle(at)matronics.com>
Subject: Rusty RV-8 Steel Parts
Dear Van's,
I am stripping all of the steel parts on my RV-8 to have them re-powder coated in a textured black to match the rest of my interior. While stripping, I have noticed a couple of things regarding factory powder coating. Perhaps the most disturbing was the high build up rust under parts in certain areas, primarily the ones made from the 4130 plate (see attached pictures). This will eventually cause the powder to flake off.
The other issue is the distinct lack of surface prep on all steel parts! On every single steel part that I have stripped, there is no surface preparation such as scuffing and/or phosphating. All of my steel parts will be undergoing these steps prior to powder coating for the absolute best possible protection from future rust break through. Additionally, the adhesion of the powder coat is significantly better with these additional surface preparations. The cost differential is minimal, since high-end coaters usually do these steps by default.
Many builders faced with changing the color of their steel parts will simply choose to paint or powder coat over the top of the factory powder coating. This will eventually lead to a less-than-satisfactory result for the reasons outlined above.
FYI.
-
Matt Dralle
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Matt Dralle
RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 172+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 180+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer Mode
Matt's Livermore Airport Live ATC Stream!
Check out the live ATC stream directly from my hangar at the Livermore
Airport. Includes both Tower and Ground transmissions. Archives too!
For entertainment purposes only. http://klvk.matronics.com
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Matt Dralle
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vanremog(at)aol.com
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| Posted: Sun Jul 13, 2014 12:27 pm Post subject: Rusty RV-8 Steel Parts |
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Go back and look at the archives. I warned about this very issue when Van's first began this "new" process and no one was interested. The only proper way to protect steel parts from corrosion by painting (not plating) is by blasting the surface rust free, applying a well bonded (clean with tooth), tight (epoxy) sacrificial (chromate) layer and, if you like, a well bonded (within the required time to crosslink) a good top coat. This has been well established. Powder coating is decorative, not protective.
-GV
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| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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HCRV6(at)comcast.net
Guest
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| Posted: Sun Jul 13, 2014 3:02 pm Post subject: Rusty RV-8 Steel Parts |
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I had the same problem back in 2002 and 2003 with the canopy frame for my RV-6, which at that time was the only powder coated part I received. after that I ordered the engine mount bare and painted it myself. Sound like not much has changed with Van's powder coating supplier.
Harry Crosby
From: "Dralle, Matt" <dralle(at)matronics.com>
To: "RV-List" <rv-list(at)matronics.com>
Sent: Sunday, July 13, 2014 11:27:09 AM
Subject: Rusty RV-8 Steel Parts
I sent this email to Van's today. Something to watch out for..
| Quote: | Date: Sun, 13 Jul 2014 11:23:02 -0700
To: support(at)vansaircraft.com
From: Matt Dralle <dralle(at)matronics.com>
Subject: Rusty RV-8 Steel Parts
Dear Van's,
I am stripping all of the steel parts on my RV-8 to have them re-powder coated in a textured black to match the rest of my interior. While stripping, I have noticed a couple of things regarding factory powder coating. Perhaps the most disturbing was the high build up rust under parts in certain areas, primarily the ones made from the 4130 plate (see attached pictures). This will eventually cause the powder to flake off.
The other issue is the distinct lack of surface prep on all steel parts! On every single steel part that I have stripped, there is no surface preparation such as scuffing and/or phosphating. All of my steel parts will be undergoing these steps prior to powder coating for the absolute best possible protection from future rust break through. Additionally, the adhesion of the powder coat is significantly better with these additional surface preparations. The cost differential is minimal, since high-end coaters usually do these steps by default.
Many builders faced with changing the color of their steel parts will simply choose to paint or powder coat over the top of the factory powder coating. This will eventually lead to a less-than-satisfactory result for the reasons outlined above.
FYI.
-
Matt Dralle
|
-
Matt Dralle
RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 172+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 180+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer Mode
Matt's Livermore Airport Live ATC Stream!
Check out the live ATC stream directly from my hangar at the Livermore
Airport. Includes both Tower and Ground transmissions. Archives too!
For entertainment purposes only. http://klvk.matronics.com
[quote][b]
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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Hopperdhh(at)aol.com
Guest
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| Posted: Mon Jul 14, 2014 3:23 am Post subject: Rusty RV-8 Steel Parts |
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Same here. When I was working on my canopy frame to make it fit, the powder coating cracked and flaked off showing bare metal with a little rust. Made me not a big believer in powder coating, but maybe its OK with the right prep. When I hear people talking about the greatness of powder coating it always brings back memories! This was in about 2003 because my 7A has been flying since 2004. To be honest I scraped off the loose coating, touched it up with a spray can, and have pretty much forgotten about it. Wow! Has it been 10 years?
Thanks, Matt for bringing this to Van's attention. I enjoy following your building progress.
Dan Hopper
N766DH
In a message dated 7/13/2014 7:03:07 P.M. Eastern Daylight Time, HCRV6(at)comcast.net writes:
| Quote: | I had the same problem back in 2002 and 2003 with the canopy frame for my RV-6, which at that time was the only powder coated part I received. after that I ordered the engine mount bare and painted it myself. Sound like not much has changed with Van's powder coating supplier.
Harry Crosby
From: "Dralle, Matt" <dralle(at)matronics.com>
To: "RV-List" <rv-list(at)matronics.com>
Sent: Sunday, July 13, 2014 11:27:09 AM
Subject: Rusty RV-8 Steel Parts
I sent this email to Van's today. Something to watch out for...
| Quote: | Date: Sun, 13 Jul 2014 11:23:02 -0700
To: support(at)vansaircraft.com
From: Matt Dralle <dralle(at)matronics.com>
Subject: Rusty RV-8 Steel Parts
Dear Van's,
I am stripping all of the steel parts on my RV-8 to have them re-powder coated in a textured black to match the rest of my interior. While stripping, I have noticed a couple of things regarding factory powder coating. Perhaps the most disturbing was the high build up rust under parts in certain areas, primarily the ones made from the 4130 plate (see attached pictures). This will eventually cause the powder to flake off.
The other issue is the distinct lack of surface prep on all steel parts! On every single steel part that I have stripped, there is no surface preparation such as scuffing and/or phosphating. All of my steel parts will be undergoing these steps prior to powder coating for the absolute best possible protection from future rust break through. Additionally, the adhesion of the powder coat is significantly better with these additional surface preparations. The cost differential is minimal, since high-end coaters usually do these steps by default.
Many builders faced with changing the color of their steel parts will simply choose to paint or powder coat over the top of the factory powder coating. This will eventually lead to a less-than-satisfactory result for the reasons outlined above.
FYI.
-
Matt Dralle
|
-
Matt Dralle
RV-8 #82880 N998RV "Ruby Vixen"
http://www.mattsrv8.com - Matt's Complete RV-8 Construction Log
http://www.mattsrv8.com/Mishap - Landing Mishap Rebuild Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 172+ Hours TTSN - Rebuilding Fuselage After Landing Mishap...
RV-6 #20916 N360EM "The Flyer"
http://www.mattsrv6.com - Matt's RV-6 Revitalization Log
Status: 180+ Hours Since Purchase - Upgrades Complete; Now In Full Flyer Mode
Matt's Livermore Airport Live ATC Stream!
Check out the live ATC stream directly from my hangar at the Livermore
Airport. Includes both Tower and Ground transmissions. Archives too!
For entertainment purposes only. http://klvk.matronics.com
|
[quote][b]
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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