As I mentioned in a previous reply I'm cleaning up and old 4" NRC
diff. pump. The previous owners let it over heat and melt the splash
guard to the bottom of the pump. I had to use a combination of acid
to dissolve the stuck on aluminum and sand blasting to clean off the
black crusty crud that was still stuck on the steel bottom of the
pump. That's steel not stainless steel.

Questions:

The bottom of the pump rusts very easily now. What can I use to
plate the steel to stop the rust?

I read that copper is not good for the oil. Anyway you have to plate
steel with nickel before copper will stick. Nickel is nice but do I
really have to send it to the plater?

Can I tin the surface with some plumbers tin/silver solder? I know
it can be used on copper plumbing for vac. systems but I have no clue
how it will react with hot oil.

Also what about Parkerizing? It's good for gun barrels what about
the inside of diffusion pumps??

Thanks,

Roy M.

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I think it would work. The phosphate stuff should be the same thing
used in Parkerizing. I Think a phosphate coating in other parts of
the system might collect water and outgas. But in the bottom of the
diff. pump, hot and under a vacuum it should clear the water out
pretty fast. I just don't know how it will react with the hot oil.

Roy M.

--- In VacuumX@..., "Aurigema, Andrew N. (KSC)[ASRC
AEROSPACE]" <andrew.n.aurigema@...> wrote:

just a guess............... try OSPHO.

you will have iron phosphate not rust. But I really dont know.

________________________________

From: VacuumX@... [mailto:VacuumX@...] On

Behalf

Of radroy92
Sent: Monday, June 30, 2008 1:05 PM
To: VacuumX@...
Subject: [VacuumX] Cleaning and repairing a diffusion pump



As I mentioned in a previous reply I'm cleaning up and old 4" NRC
diff. pump. The previous owners let it over heat and melt the

splash

guard to the bottom of the pump. I had to use a combination of acid
to dissolve the stuck on aluminum and sand blasting to clean off

the

black crusty crud that was still stuck on the steel bottom of the
pump. That's steel not stainless steel.

Questions:

The bottom of the pump rusts very easily now. What can I use to
plate the steel to stop the rust?

I read that copper is not good for the oil. Anyway you have to

plate

steel with nickel before copper will stick. Nickel is nice but do I
really have to send it to the plater?

Can I tin the surface with some plumbers tin/silver solder? I know
it can be used on copper plumbing for vac. systems but I have no

clue

how it will react with hot oil.

Also what about Parkerizing? It's good for gun barrels what about
the inside of diffusion pumps??

Thanks,

Roy M.