Alodine

I read an article that said that you should paint a part before four
hours (max) of applying Alodine.

What do you do if you don't get it done in that time? Wash it off,
sand it off, paint anyways?

Thanks

Hi,

Do you happen to remember the source of the article? This has never been
part of a protocol that I have worked under when painting aluminum after
using Alodine 1201. However, it has been so long since I have actually
"read the instructions" I dug out the paperwork for both Alodine and the
numerous primers I have used over the Alodine. The only time sensitive
reference I could find was related to the time between the aluminum
cleaning/etch and the application of the Alodine. None of the non-etching
primer product application sheets had a time reference to the delay since
Alodining - Except for the statement, "The primer should be applied as soon
as possible after the application of a conversion coatings such as Alodine.
" But, this was in the same paragraph that talked about the necessity for an
absolutely clean and properly prepared surface. Personally, I have never
had a problem with primer adhesion due to a time delay.

In the article you read, it could be that there was a concern for surface
contamination or coating damage after the application of the Alodine.
Alodine produces a very thin conversion coating and any agressive efforts to
clean a previously Alodined part will remove some or all of the coating. If
we need to re-clean an Alodined part (someone touched the surface or edges
with bare fingers after the final water rinse has dried) we use only MEK on
a very soft cotton cloth.

Maybe I have been lucky.

J








"Pat Yearick" wrote in message
om...
I read an article that said that you should paint a part before four
hours (max) of applying Alodine.

What do you do if you don't get it done in that time? Wash it off,
sand it off, paint anyways?

Thanks

On Sat, 06 Sep 2003 02:53:32 GMT, "Flightdeck"
wrote:

We have a similar spec. (in the Aerospace Industry) that
says prime x hours after alodine or else. My guess is the impetus
for applying a quality primer asap over freshly applied alodine is the
alodined surface is very susceptible to scratches / blemishes in
handling the part (the alodined surface is very soft). In fact, if
it weren't for the susceptibility to scratches, damage, etc., a
properly cleaned, alodined aluminum surface has fantastic
anti-corrosion properties. It's just that the bare conversion coating
doesn't hold up well to abuse/wear....

Bela P. Havasreti

Hi,

Do you happen to remember the source of the article? This has never been
part of a protocol that I have worked under when painting aluminum after
using Alodine 1201. However, it has been so long since I have actually
"read the instructions" I dug out the paperwork for both Alodine and the
numerous primers I have used over the Alodine. The only time sensitive
reference I could find was related to the time between the aluminum
cleaning/etch and the application of the Alodine. None of the non-etching
primer product application sheets had a time reference to the delay since
Alodining - Except for the statement, "The primer should be applied as soon
as possible after the application of a conversion coatings such as Alodine.
" But, this was in the same paragraph that talked about the necessity for an
absolutely clean and properly prepared surface. Personally, I have never
had a problem with primer adhesion due to a time delay.

In the article you read, it could be that there was a concern for surface
contamination or coating damage after the application of the Alodine.
Alodine produces a very thin conversion coating and any agressive efforts to
clean a previously Alodined part will remove some or all of the coating. If
we need to re-clean an Alodined part (someone touched the surface or edges
with bare fingers after the final water rinse has dried) we use only MEK on
a very soft cotton cloth.

Maybe I have been lucky.

J








"Pat Yearick" wrote in message
. com...
I read an article that said that you should paint a part before four
hours (max) of applying Alodine.

What do you do if you don't get it done in that time? Wash it off,
sand it off, paint anyways?

Thanks