[SEL] Anyone Ever Used Phosphoric Acid to DeRust

[Dave Rotigel]

REMEMBER, "Do what you otter, add acid to water!"
         Dave

At 11:05 PM 11/9/2006, you wrote:


>Paul Maples wrote:
>>Folks I was wondering if anyone had used phosphoric acid to derust? I 
>>have some phosphoric acid and was thinking of using it in the bottom of 
>>my Stover Block (base) where the oil sump is. Over the years water had 
>>condensed in this area and there is a pretty good rust area for about 2" 
>>on the inside of the crankcase.
>>If anyone has used Phosphoric Acid I would like to know what strength you 
>>used, did you cut it with water, about how long did you leave it on the 
>>metal and what did you neutralize it with.
>>Thanks,
>>Paul
>>_______________________________________________
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>>SEL at lists.stationary-engine.com
>>http://www.stationary-engine.com/mailman/listinfo/sel
>
>Yep, Navel Jelly is Phosphoric acid made into a gel. The stuff used in 
>many body shops as a rust neutralizer is also Phosphoric acid reduced down 
>with water. Metal-Prep 79 is what I use in the shop as a panel prep to 
>prevent light rust when working with bare metal. It is 95% Phosphoric acid 
>with a couple other chemicals.
>
>On heavy rust it gets diluted very little (1 pint of water to one gallon 
>of acid) with water. Light overnight rust gets a spritz with the bottle of 
>a reverse mix. Then wiped off and dried.
>Immersion bath gets 1 quart MP79 to  3 quarts water.
>
>--
>Steve W.
>Near Cooperstown, New York