[SEL] Anyone Ever Used Phosphoric Acid to DeRust

[Paul Maples]

Thanks Orrin,

I have (2) quarts of the phosphoric acid (80% strength) and since I have 
them I thought I would go ahead and use them. Would you use the acid at the 
80% strength or reduce it's strength?

Never heard of Ospho or Metal Ready, are these products available at local 
hardware stores like Ace?


----- Original Message ----- 
From: "Orrin Iseminger" <oiseming at moscow.com>
To: "'The SEL email discussion list'" <sel at lists.stationary-engine.com>
Sent: Thursday, November 09, 2006 11:05 PM
Subject: RE: [SEL] Anyone Ever Used Phosphoric Acid to DeRust


> Paul -- 
>
> I've used phosphoric acid to remove light rust.  I use it full strength.
> Sometimes I'll neutralize it by putting it into my electrolytic vat. 
> Other
> times I'll not neutralize it, but wash it off, instead, and then apply one
> of the metal prep solutions, such as Ospho or Metal Ready.
>
> For your crankcase, I'd suggest either molasses or a solution of salt and
> vinegar.  Just dissolve as much salt as you can in the vinegar and pour 
> the
> solution into your crankcase.  It would be cheaper than phosphoric acid 
> and
> you probably have already have the supplies you need for the job.
>
> IMHO, you'll have a slower, more controllable reaction with molasses or
> salt/vinegar.
>
> After de-rusting, I'd passivate the surface with Ospho, or similar.
>
> Regards,
>
> Orrin
>
>