Re: rusty transformers

In article <QVf2m.3527$0T2.3270@xxxxxxxxxxxx>, "Dr. Barry L. Ornitz" <BLOrnitz48@xxxxxxxxxxx> wrote:
Rather than re-quote excessive text, let me combine several questions
and answers into one message.

GregS wrote:
The question arises, what is one trying to accomplish. You could
use a very small amount of paint with a whole lot of mineral
spirits, and that would also try to seep into the laminates and
dry. Then progressively use thicker coatings. With no need to oil
it up, why bother, except for a quick fix.

I see no need for any oil either. Even if diluted into a very low
viscosity, oil based paint between the laminations may never dry

On my contact cleaner research page, I got an email from a guy
saying in 1962 the Navy banned the use of WD-40 on hydrophones
because it contained a small amount of silicone.That would be great
for a paint job !!! Perhaps now the formula has changed. That would
be WD-41 !!

To the best of my knowledge, WD-40 has never contained silicones.
The earliest compositions of WD-40 had mainly Stoddard solvent with
small amounts of lubricating oil. This has changed over the years as
now WD-40 contains up to 35% of lubricating oil. The exact
composition of WD-40 changes from batch to batch depending on who
supplies the solvent and oils. If the oils are more viscous, they
add more solvent. Remember that all petroleum products are mixtures.

I don't know if it was true, and I don't know what Navy.(US) That was
from a person who I will quote below..

As WD-40 contains small amounts of silicone, we advise against its use.
The problem with any product containing silicone it that when it is
exposed to salt, it can form 'waterglass', which ie an excellent
insulator and it is very difficult to remove! In 1962, the US navy
banned its use in sonar hydrophones for that reason. I have friends who
are commercial pilots who sprayed it on wing-flap hinges; the
consequence was that the skin of the flap developed hairline cracks. The
normal technique of 'Stop drilling' did not prevent the propagation of
the crack.

Wm. M. Wright, CEO
S. W. Electrochemicals Ltd.
.

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