Alclad Aluminum

[mhorowit]

For the folks who use Alclad Aluminum. Am I corrrect in that if you
don't intend to paint it, it needs no additional coating? - Mike

[Jim Carriere]

mhorowit wrote:
> For the folks who use Alclad Aluminum. Am I corrrect in that if you
> don't intend to paint it, it needs no additional coating? - Mike

That depends most on the environment where you intend to use it: desert,
maritime, or in between.

[Dan[_2_]]

Jim Carriere wrote:
> mhorowit wrote:
>> For the folks who use Alclad Aluminum. Am I corrrect in that if you
>> don't intend to paint it, it needs no additional coating? - Mike
>
> That depends most on the environment where you intend to use it: desert,
> maritime, or in between.

And whether the cladding has been or will be compromised by
scratching etc.

Dan, U.S. Air Force, retired

[David Lamphere]

Perhaps this has been discussed before - if so, I apologize.

Has anyone used the auto style fuses (as recommended by BN, AerolElectrics
Connection) in their homebuilts?

It seems like a neat way of combining power bus with circuit protection. Not
to mention a reliable and much cheaper path to take than circuit breakers.

If so, where did you put the fuse blocks and how did you mount them (so
ground access would be easy)??

Thanks,
Dave

[Dennis Johnson]

"David Lamphere" > wrote in message
ink.net...
> Has anyone used the auto style fuses (as recommended by BN, AerolElectrics
> Connection) in their homebuilts?

Hi David,

B&C and SteinAir are two good sources for the fuseblocks and they both have
outstanding customer service.

B&C: http://www.bandc.biz/cgi-bin/ez-catalog/cat_display.cgi?7X358218#fh20

SteinAir: http://www.steinair.com/fuseblocks.htm

I agree with you that fuseblocks provide an inexpensive, light, and reliable
system.

Good luck with your project,
Dennis Johnson

[jls]

mhorowit wrote:
> For the folks who use Alclad Aluminum. Am I corrrect in that if you
> don't intend to paint it, it needs no additional coating? - Mike

Monsieur Horowitz, you should alodine it and paint it. That gives you
a triple whammy against corrosion. I've seen the cladding corroded
through on alclad aluminum and the surface underneath, which was 2024,
corroded all to hell.

Where are you using it?

I'm presently working on an airframe with a lot of 6061 in it. It's
from the 50's and very corroded, although the talk on 6061 is that it's
corrosion-resistant. Well, if you saw this you would say it ain't.

So where the aluminum is stilll usable, I clean, apply phosphoric acid,
clean again, and etch with chromic acid, i. e., I alodine. Then prime
and paint.

With the steel parts, I remove corrosion and if the part is still
usable, i. e., not too pitted, I bead-blast it, paint it with an acid
etch 2-part epoxy primer, then with a good organic paint before
reinstalling it in the aircraft. This would include parts like strut
attach fittings, drag wires*, pulley brackets, aileron and flap hinge
brackets, wingtip bow attach fittings, wing tank hardware, and butt
hinge fittings. If it were legal, I'd do a lot of powder-coating, and
I notice a lot of companies who manufacture PMA parts powder-coat their
parts. I just received a rudder which was beautifully powder-coated.
I doubt that damn thing will corrode any time soon.

Treat scrupulously against corrosion. You owe it to the next
generations who will appreciate your old airplane and cherish it as you
do.

I just watched a video by respected ragwing Piper specialist, Paul
Babcock, restoring a Super Cub. He says that because of a recent Piper
mandatory service bulletin, most of the Super Cubs in the USA are
required to have their fabric ripped away and the metal parts repaired
or replaced and treated against corrosion and painted. Having seen
the hidden condition of a few of these older PA-18's inside the wings,
I think I agree with Piper and Babcock. Some of them are scary.


*The newer drag wires are CRS, so no corrosion protection needed.

[Ernest Christley]

Dennis Johnson wrote:
> "David Lamphere" > wrote in message
> ink.net...
>> Has anyone used the auto style fuses (as recommended by BN, AerolElectrics
>> Connection) in their homebuilts?
>
> Hi David,
>
> B&C and SteinAir are two good sources for the fuseblocks and they both have
> outstanding customer service.
>
> B&C: http://www.bandc.biz/cgi-bin/ez-catalog/cat_display.cgi?7X358218#fh20
>
> SteinAir: http://www.steinair.com/fuseblocks.htm
>
> I agree with you that fuseblocks provide an inexpensive, light, and reliable
> system.
>
> Good luck with your project,
> Dennis Johnson
>
>

Watch eBay for much better prices. They periodically go on sale for
$2ea for the 40 fuse blocks. I'm not going to tell the guy he's giving
his stuff away if you don't 8*) I bought enough for myself and several
other projects in the chapter.

I mounted mine behind a panel that also holds the switch panel. I
borrowed a very high-end crimper from a friend to attach the 1/4"
connectors. Factory crimps, they are. I ran the wires down against the
panel to the switches, and held them down with hotglue. Makes for a
very clean installation.

[mhorowit]

jls wrote:

>
> Where are you using it?
>

The leading edge of the ailerons is thin alluminum sheet. I put a lot
of effort into physically removing corrosion on the left aileron and if
the right was in the same shape, I was thinking it would be easier to
simply make new parts. Someone pointed out that alodining chemicals
could be brushed on (rather than having to build tanks) and cost was
very reasonable, so I think I'll stick with my original approach. The
sheetmetal will be covered by fabric.

By the way... There is a metal prep that is used for cleaning prior to
alodining. It is a phosphoric solution. Is that also used for
chemically removing corrosion, or simply preping the surface for the
chromic coating? - Mike

[jls]

mhorowit wrote:
> jls wrote:
>
> >
> > Where are you using it?
> >
>
> The leading edge of the ailerons is thin alluminum sheet. I put a lot
> of effort into physically removing corrosion on the left aileron and if
> the right was in the same shape, I was thinking it would be easier to
> simply make new parts. Someone pointed out that alodining chemicals
> could be brushed on (rather than having to build tanks) and cost was
> very reasonable, so I think I'll stick with my original approach. The
> sheetmetal will be covered by fabric.

You don't need tanks for alodining. You brush it on, let it sit
awhile, then wash it off. Use phosphoric acid solution first, then
wash off, then chromic acid solution. Then wash off, leaving a little
tannish, bluish color behind on the aluminum surface.

You can use a little scotchbrite to get off the oxide powder before
using phosphoric acid.

I have restored several sets of ailerons on Taylorcrafts from the 40's
and the aluminum in most cases is restorable. After you've alodined
you can prime with Polyfiber's proprietary primer which won't dissolve
when you glue on the fabric to the leading edge.
>
> By the way... There is a metal prep that is used for cleaning prior to
> alodining. It is a phosphoric solution. Is that also used for
> chemically removing corrosion, or simply preping the surface for the
> chromic coating? - Mike

The phosphoric acid prepares for chromic acid coating,as well as
removing some corrosion. Use scotchbrite if the corrosion is thick and
powdery.

[jls]

mhorowit wrote:
> jls wrote:
>
> >
> > Where are you using it?
> >
>
> The leading edge of the ailerons is thin alluminum sheet. I put a lot
> of effort into physically removing corrosion on the left aileron and if
> the right was in the same shape, I was thinking it would be easier to
> simply make new parts. Someone pointed out that alodining chemicals
> could be brushed on (rather than having to build tanks) and cost was
> very reasonable, so I think I'll stick with my original approach. The
> sheetmetal will be covered by fabric.

You don't need tanks for alodining. You brush it on, let it sit
awhile, then wash it off. Use phosphoric acid solution first, then
wash off, then chromic acid solution. Then wash off, leaving a little
tannish, bluish color behind on the aluminum surface.

You can use a little scotchbrite to get off the oxide powder before
using phosphoric acid.

I have restored several sets of ailerons on Taylorcrafts from the 40's
and the aluminum in most cases is restorable. After you've alodined
you can prime with Polyfiber's proprietary primer which won't dissolve
when you glue on the fabric to the leading edge.
>
> By the way... There is a metal prep that is used for cleaning prior to
> alodining. It is a phosphoric solution. Is that also used for
> chemically removing corrosion, or simply preping the surface for the
> chromic coating? - Mike

The phosphoric acid prepares for chromic acid coating,as well as
removing some corrosion. Use scotchbrite if the corrosion is thick and
powdery.

[jls]

mhorowit wrote:
> jls wrote:
>
> >
> > Where are you using it?
> >
>
> The leading edge of the ailerons is thin alluminum sheet. I put a lot
> of effort into physically removing corrosion on the left aileron and if
> the right was in the same shape, I was thinking it would be easier to
> simply make new parts. Someone pointed out that alodining chemicals
> could be brushed on (rather than having to build tanks) and cost was
> very reasonable, so I think I'll stick with my original approach. The
> sheetmetal will be covered by fabric.

You don't need tanks for alodining. You brush it on, let it sit
awhile, then wash it off. Use phosphoric acid solution first, then
wash off, then chromic acid solution. Then wash off, leaving a little
tannish, bluish color behind on the aluminum surface.

You can use a little scotchbrite to get off the oxide powder before
using phosphoric acid.

I have restored several sets of ailerons on Taylorcrafts from the 40's
and the aluminum in most cases is restorable. After you've alodined
you can prime with Polyfiber's proprietary primer which won't dissolve
when you glue on the fabric to the leading edge.
>
> By the way... There is a metal prep that is used for cleaning prior to
> alodining. It is a phosphoric solution. Is that also used for
> chemically removing corrosion, or simply preping the surface for the
> chromic coating? - Mike

The phosphoric acid prepares for chromic acid coating,as well as
removing some corrosion. Use scotchbrite if the corrosion is thick and
powdery.

[jls]

mhorowit wrote:
> jls wrote:
>
> >
> > Where are you using it?
> >
>
> The leading edge of the ailerons is thin alluminum sheet. I put a lot
> of effort into physically removing corrosion on the left aileron and if
> the right was in the same shape, I was thinking it would be easier to
> simply make new parts. Someone pointed out that alodining chemicals
> could be brushed on (rather than having to build tanks) and cost was
> very reasonable, so I think I'll stick with my original approach. The
> sheetmetal will be covered by fabric.

You don't need tanks for alodining. You brush it on, let it sit
awhile, then wash it off. Use phosphoric acid solution first, then
wash off, then chromic acid solution. Then wash off, leaving a little
tannish, bluish color behind on the aluminum surface.

You can use a little scotchbrite to get off the oxide powder before
using phosphoric acid.

I have restored several sets of ailerons on Taylorcrafts from the 40's
and the aluminum in most cases is restorable. After you've alodined
you can prime with Polyfiber's proprietary primer which won't dissolve
when you glue on the fabric to the leading edge.
>
> By the way... There is a metal prep that is used for cleaning prior to
> alodining. It is a phosphoric solution. Is that also used for
> chemically removing corrosion, or simply preping the surface for the
> chromic coating? - Mike

The phosphoric acid prepares for chromic acid coating,as well as
removing some corrosion. Use scotchbrite if the corrosion is thick and
powdery.