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Old 07-28-2015, 07:56 PM   #2185
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Corrosion problems with new Airstreams

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Originally Posted by ROBERT CROSS View Post
It's not....any coated aluminum panel is susceptible.



Go to the Jaguar or Audi forums' I'm sure it's being discussed.

Bob

I have never seen this on any of the aluminum cars that I have worked around for many years(37).And I have been around and up close to all of them.Even the Kirkham Cobras that have natural aluminum body panels and have no clear coat finish at all.Many of you have cars in your garage with aluminum body panels usually the trunk and or hood.Automobile manufacturers have been using aluminum for many years.


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Old 07-28-2015, 08:16 PM   #2186
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I have never seen this on any of the aluminum cars that I have worked around for many years(37).And I have been around and up close to all of them.Even the Kirkham Cobras that have natural aluminum body panels and have no clear coat finish at all.Many of you have cars in your garage with aluminum body panels usually the trunk and or hood.Automobile manufacturers have been using aluminum for many years.
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Wow...... 37 years, that pretty well covers it.

OMG....I'm rong again.

Sorry.

Bob
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Old 07-28-2015, 08:41 PM   #2187
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Corrosion problems with new Airstreams

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Originally Posted by ROBERT CROSS View Post
Wow...... 37 years, that pretty well covers it.



OMG....I'm rong again.



Sorry.



Bob


Not saying you are wrong Bob,I have just not seen this as a common problem.I have always thought the Airstream corrosion problem was due to dissimilar metal usage a galvanic corrosion.
But I have been told I was wrong.
Oh well .....

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Old 07-29-2015, 11:19 AM   #2188
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Apologies. I didn't mean to start that discussion back up. I just had a thought and felt the need to blurt it out.

It would appear strange that the largest selling vehicle would move to a material that has known issues. I wold bet they researched the heck out of airstream.
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Old 07-29-2015, 07:33 PM   #2189
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Apologies. I didn't mean to start that discussion back up. I just had a thought and felt the need to blurt it out.

It would appear strange that the largest selling vehicle would move to a material that has known issues. I wold bet they researched the heck out of airstream.
Hi, steel, copper, brass, all metals have issues. I'm sure Ford has way more experience with aluminum than Airstream. I bet Ford has used more aluminum in just making hoods than Airstream has ever used, pound for pound.
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Old 07-29-2015, 08:58 PM   #2190
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Corrosion problems with new Airstreams

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Hi, steel, copper, brass, all metals have issues. I'm sure Ford has way more experience with aluminum than Airstream. I bet Ford has used more aluminum in just making hoods than Airstream has ever used, pound for pound.

They have been experimenting with aluminum for years.And Ford has had some issues in there applications.Paint bubbling and and flaking were the main problems in recent times.
Do the early model Airstreams experience the same filform corrosion?
Could this problem be accelerated by the use of recycled aluminum vs virgin raw aluminum?
Hmmm..

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Old 07-29-2015, 11:03 PM   #2191
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Remember that Ford built the Tri-motor aluminum airliner in the 1930s, so they have had a long relationship with the metal. They turned out a lot of aluminum bombers at the Willow Run plant during WW II. So the F150 is not their first aluminum rodeo.
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Old 07-30-2015, 04:09 AM   #2192
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Mo,

The older AS's were coated in-house after assembly.
The rolled aluminum used today comes pre-coated from Alcoa.
Every cut edge or rivet hole compromises' that coating, hence.......filiform.

Switz,

I don't believe those planes used pre-coated aluminum.

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Old 07-30-2015, 05:54 AM   #2193
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You've apparently never owned a Land Rover!
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Old 07-30-2015, 06:02 AM   #2194
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Question What does a LR have to do with anything.....

You've apparently never owned a Tri-Motor.

Bob
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Old 07-30-2015, 06:13 AM   #2195
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Is that also a galvanic time bomb?
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Old 07-30-2015, 06:27 AM   #2196
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Question

Who's talking "galvanic?"

Filiform


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Old 07-30-2015, 07:35 AM   #2197
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Remember our trailers have both, galvanic and filiform. Put a steel screw through a hole in aluminum anywhere and you are asking for galvanic. Our Clear-coat provides, what I like to think of as, an incubator for filiform to grow under, if it can find a place to start. That place will be a pen hole, scratch, drilled rivet hole or raw aluminum edge. Really, if our modern airstreams were not coated at all we would never get filiform, but they would look an oxidized dull gray quickly. I'm thinking, can't prove this one, that our older trailers (70s and earlier) did not experience the filiform problem, even though they were plastic coated, because the material was Alclad. That pure aluminum external layer is pretty corrosion resistant.
Of course that Alclad is why the reconditioned classics shine like a silver dollar when stripped and polished. Today's trailers; we could strip and polish. T hey would look shinny, but shinny grey.

As for Ford, remember they have a choice of prep and primers to use under the paint. I have to think that gives them a whole lot more options for the AL metal protection.


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Old 07-30-2015, 08:13 AM   #2198
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Galvanic & Aluminum......made worse when saltwater is used as the electrolyte.

Bob
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